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qemu/hw/misc/vfio.c
Alexey Kardashevskiy 8d7b5a1da0 vfio: fix mapping of MSIX bar 
VFIO virtualizes MSIX table for the guest but not mapping the part of
a BAR which contains an MSIX table. Since vfio_mmap_bar() mmaps chunks
before and after the MSIX table, they have to be aligned to the host
page size which may be TARGET_PAGE_MASK (4K) or 64K in case of PPC64.

This fixes boundaries calculations to use the real host page size.

Without the patch, the chunk before MSIX table may overlap with the MSIX
table and mmap will fail in the host kernel. The result will be serious
slowdown as the whole BAR will be emulated by QEMU.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2014-01-17 11:12:56 -07:00

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/*
* vfio based device assignment support
*
* Copyright Red Hat, Inc. 2012
*
* Authors:
* Alex Williamson <alex.williamson@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Based on qemu-kvm device-assignment:
* Adapted for KVM by Qumranet.
* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
*/
#include <dirent.h>
#include <linux/vfio.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "config.h"
#include "exec/address-spaces.h"
#include "exec/memory.h"
#include "hw/pci/msi.h"
#include "hw/pci/msix.h"
#include "hw/pci/pci.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qemu/event_notifier.h"
#include "qemu/queue.h"
#include "qemu/range.h"
#include "sysemu/kvm.h"
#include "sysemu/sysemu.h"
/* #define DEBUG_VFIO */
#ifdef DEBUG_VFIO
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, "vfio: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
/* Extra debugging, trap acceleration paths for more logging */
#define VFIO_ALLOW_MMAP 1
#define VFIO_ALLOW_KVM_INTX 1
#define VFIO_ALLOW_KVM_MSI 1
#define VFIO_ALLOW_KVM_MSIX 1
struct VFIODevice;
typedef struct VFIOQuirk {
MemoryRegion mem;
struct VFIODevice *vdev;
QLIST_ENTRY(VFIOQuirk) next;
struct {
uint32_t base_offset:TARGET_PAGE_BITS;
uint32_t address_offset:TARGET_PAGE_BITS;
uint32_t address_size:3;
uint32_t bar:3;
uint32_t address_match;
uint32_t address_mask;
uint32_t address_val:TARGET_PAGE_BITS;
uint32_t data_offset:TARGET_PAGE_BITS;
uint32_t data_size:3;
uint8_t flags;
uint8_t read_flags;
uint8_t write_flags;
} data;
} VFIOQuirk;
typedef struct VFIOBAR {
off_t fd_offset; /* offset of BAR within device fd */
int fd; /* device fd, allows us to pass VFIOBAR as opaque data */
MemoryRegion mem; /* slow, read/write access */
MemoryRegion mmap_mem; /* direct mapped access */
void *mmap;
size_t size;
uint32_t flags; /* VFIO region flags (rd/wr/mmap) */
uint8_t nr; /* cache the BAR number for debug */
bool ioport;
bool mem64;
QLIST_HEAD(, VFIOQuirk) quirks;
} VFIOBAR;
typedef struct VFIOVGARegion {
MemoryRegion mem;
off_t offset;
int nr;
QLIST_HEAD(, VFIOQuirk) quirks;
} VFIOVGARegion;
typedef struct VFIOVGA {
off_t fd_offset;
int fd;
VFIOVGARegion region[QEMU_PCI_VGA_NUM_REGIONS];
} VFIOVGA;
typedef struct VFIOINTx {
bool pending; /* interrupt pending */
bool kvm_accel; /* set when QEMU bypass through KVM enabled */
uint8_t pin; /* which pin to pull for qemu_set_irq */
EventNotifier interrupt; /* eventfd triggered on interrupt */
EventNotifier unmask; /* eventfd for unmask on QEMU bypass */
PCIINTxRoute route; /* routing info for QEMU bypass */
uint32_t mmap_timeout; /* delay to re-enable mmaps after interrupt */
QEMUTimer *mmap_timer; /* enable mmaps after periods w/o interrupts */
} VFIOINTx;
typedef struct VFIOMSIVector {
EventNotifier interrupt; /* eventfd triggered on interrupt */
struct VFIODevice *vdev; /* back pointer to device */
MSIMessage msg; /* cache the MSI message so we know when it changes */
int virq; /* KVM irqchip route for QEMU bypass */
bool use;
} VFIOMSIVector;
enum {
VFIO_INT_NONE = 0,
VFIO_INT_INTx = 1,
VFIO_INT_MSI = 2,
VFIO_INT_MSIX = 3,
};
struct VFIOGroup;
typedef struct VFIOType1 {
MemoryListener listener;
int error;
bool initialized;
} VFIOType1;
typedef struct VFIOContainer {
int fd; /* /dev/vfio/vfio, empowered by the attached groups */
struct {
/* enable abstraction to support various iommu backends */
union {
VFIOType1 type1;
};
void (*release)(struct VFIOContainer *);
} iommu_data;
QLIST_HEAD(, VFIOGroup) group_list;
QLIST_ENTRY(VFIOContainer) next;
} VFIOContainer;
/* Cache of MSI-X setup plus extra mmap and memory region for split BAR map */
typedef struct VFIOMSIXInfo {
uint8_t table_bar;
uint8_t pba_bar;
uint16_t entries;
uint32_t table_offset;
uint32_t pba_offset;
MemoryRegion mmap_mem;
void *mmap;
} VFIOMSIXInfo;
typedef struct VFIODevice {
PCIDevice pdev;
int fd;
VFIOINTx intx;
unsigned int config_size;
uint8_t *emulated_config_bits; /* QEMU emulated bits, little-endian */
off_t config_offset; /* Offset of config space region within device fd */
unsigned int rom_size;
off_t rom_offset; /* Offset of ROM region within device fd */
void *rom;
int msi_cap_size;
VFIOMSIVector *msi_vectors;
VFIOMSIXInfo *msix;
int nr_vectors; /* Number of MSI/MSIX vectors currently in use */
int interrupt; /* Current interrupt type */
VFIOBAR bars[PCI_NUM_REGIONS - 1]; /* No ROM */
VFIOVGA vga; /* 0xa0000, 0x3b0, 0x3c0 */
PCIHostDeviceAddress host;
QLIST_ENTRY(VFIODevice) next;
struct VFIOGroup *group;
EventNotifier err_notifier;
uint32_t features;
#define VFIO_FEATURE_ENABLE_VGA_BIT 0
#define VFIO_FEATURE_ENABLE_VGA (1 << VFIO_FEATURE_ENABLE_VGA_BIT)
int32_t bootindex;
uint8_t pm_cap;
bool reset_works;
bool has_vga;
bool pci_aer;
bool has_flr;
bool has_pm_reset;
bool needs_reset;
bool rom_read_failed;
} VFIODevice;
typedef struct VFIOGroup {
int fd;
int groupid;
VFIOContainer *container;
QLIST_HEAD(, VFIODevice) device_list;
QLIST_ENTRY(VFIOGroup) next;
QLIST_ENTRY(VFIOGroup) container_next;
} VFIOGroup;
#define MSIX_CAP_LENGTH 12
static QLIST_HEAD(, VFIOContainer)
container_list = QLIST_HEAD_INITIALIZER(container_list);
static QLIST_HEAD(, VFIOGroup)
group_list = QLIST_HEAD_INITIALIZER(group_list);
#ifdef CONFIG_KVM
/*
* We have a single VFIO pseudo device per KVM VM. Once created it lives
* for the life of the VM. Closing the file descriptor only drops our
* reference to it and the device's reference to kvm. Therefore once
* initialized, this file descriptor is only released on QEMU exit and
* we'll re-use it should another vfio device be attached before then.
*/
static int vfio_kvm_device_fd = -1;
#endif
static void vfio_disable_interrupts(VFIODevice *vdev);
static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
uint32_t val, int len);
static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled);
/*
* Common VFIO interrupt disable
*/
static void vfio_disable_irqindex(VFIODevice *vdev, int index)
{
struct vfio_irq_set irq_set = {
.argsz = sizeof(irq_set),
.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
.index = index,
.start = 0,
.count = 0,
};
ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
}
/*
* INTx
*/
static void vfio_unmask_intx(VFIODevice *vdev)
{
struct vfio_irq_set irq_set = {
.argsz = sizeof(irq_set),
.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
.index = VFIO_PCI_INTX_IRQ_INDEX,
.start = 0,
.count = 1,
};
ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
}
#ifdef CONFIG_KVM /* Unused outside of CONFIG_KVM code */
static void vfio_mask_intx(VFIODevice *vdev)
{
struct vfio_irq_set irq_set = {
.argsz = sizeof(irq_set),
.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
.index = VFIO_PCI_INTX_IRQ_INDEX,
.start = 0,
.count = 1,
};
ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
}
#endif
/*
* Disabling BAR mmaping can be slow, but toggling it around INTx can
* also be a huge overhead. We try to get the best of both worlds by
* waiting until an interrupt to disable mmaps (subsequent transitions
* to the same state are effectively no overhead). If the interrupt has
* been serviced and the time gap is long enough, we re-enable mmaps for
* performance. This works well for things like graphics cards, which
* may not use their interrupt at all and are penalized to an unusable
* level by read/write BAR traps. Other devices, like NICs, have more
* regular interrupts and see much better latency by staying in non-mmap
* mode. We therefore set the default mmap_timeout such that a ping
* is just enough to keep the mmap disabled. Users can experiment with
* other options with the x-intx-mmap-timeout-ms parameter (a value of
* zero disables the timer).
*/
static void vfio_intx_mmap_enable(void *opaque)
{
VFIODevice *vdev = opaque;
if (vdev->intx.pending) {
timer_mod(vdev->intx.mmap_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vdev->intx.mmap_timeout);
return;
}
vfio_mmap_set_enabled(vdev, true);
}
static void vfio_intx_interrupt(void *opaque)
{
VFIODevice *vdev = opaque;
if (!event_notifier_test_and_clear(&vdev->intx.interrupt)) {
return;
}
DPRINTF("%s(%04x:%02x:%02x.%x) Pin %c\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
'A' + vdev->intx.pin);
vdev->intx.pending = true;
pci_irq_assert(&vdev->pdev);
vfio_mmap_set_enabled(vdev, false);
if (vdev->intx.mmap_timeout) {
timer_mod(vdev->intx.mmap_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + vdev->intx.mmap_timeout);
}
}
static void vfio_eoi(VFIODevice *vdev)
{
if (!vdev->intx.pending) {
return;
}
DPRINTF("%s(%04x:%02x:%02x.%x) EOI\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
vdev->intx.pending = false;
pci_irq_deassert(&vdev->pdev);
vfio_unmask_intx(vdev);
}
static void vfio_enable_intx_kvm(VFIODevice *vdev)
{
#ifdef CONFIG_KVM
struct kvm_irqfd irqfd = {
.fd = event_notifier_get_fd(&vdev->intx.interrupt),
.gsi = vdev->intx.route.irq,
.flags = KVM_IRQFD_FLAG_RESAMPLE,
};
struct vfio_irq_set *irq_set;
int ret, argsz;
int32_t *pfd;
if (!VFIO_ALLOW_KVM_INTX || !kvm_irqfds_enabled() ||
vdev->intx.route.mode != PCI_INTX_ENABLED ||
!kvm_check_extension(kvm_state, KVM_CAP_IRQFD_RESAMPLE)) {
return;
}
/* Get to a known interrupt state */
qemu_set_fd_handler(irqfd.fd, NULL, NULL, vdev);
vfio_mask_intx(vdev);
vdev->intx.pending = false;
pci_irq_deassert(&vdev->pdev);
/* Get an eventfd for resample/unmask */
if (event_notifier_init(&vdev->intx.unmask, 0)) {
error_report("vfio: Error: event_notifier_init failed eoi");
goto fail;
}
/* KVM triggers it, VFIO listens for it */
irqfd.resamplefd = event_notifier_get_fd(&vdev->intx.unmask);
if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) {
error_report("vfio: Error: Failed to setup resample irqfd: %m");
goto fail_irqfd;
}
argsz = sizeof(*irq_set) + sizeof(*pfd);
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_UNMASK;
irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
irq_set->start = 0;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
*pfd = irqfd.resamplefd;
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
if (ret) {
error_report("vfio: Error: Failed to setup INTx unmask fd: %m");
goto fail_vfio;
}
/* Let'em rip */
vfio_unmask_intx(vdev);
vdev->intx.kvm_accel = true;
DPRINTF("%s(%04x:%02x:%02x.%x) KVM INTx accel enabled\n",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);
return;
fail_vfio:
irqfd.flags = KVM_IRQFD_FLAG_DEASSIGN;
kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd);
fail_irqfd:
event_notifier_cleanup(&vdev->intx.unmask);
fail:
qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev);
vfio_unmask_intx(vdev);
#endif
}
static void vfio_disable_intx_kvm(VFIODevice *vdev)
{
#ifdef CONFIG_KVM
struct kvm_irqfd irqfd = {
.fd = event_notifier_get_fd(&vdev->intx.interrupt),
.gsi = vdev->intx.route.irq,
.flags = KVM_IRQFD_FLAG_DEASSIGN,
};
if (!vdev->intx.kvm_accel) {
return;
}
/*
* Get to a known state, hardware masked, QEMU ready to accept new
* interrupts, QEMU IRQ de-asserted.
*/
vfio_mask_intx(vdev);
vdev->intx.pending = false;
pci_irq_deassert(&vdev->pdev);
/* Tell KVM to stop listening for an INTx irqfd */
if (kvm_vm_ioctl(kvm_state, KVM_IRQFD, &irqfd)) {
error_report("vfio: Error: Failed to disable INTx irqfd: %m");
}
/* We only need to close the eventfd for VFIO to cleanup the kernel side */
event_notifier_cleanup(&vdev->intx.unmask);
/* QEMU starts listening for interrupt events. */
qemu_set_fd_handler(irqfd.fd, vfio_intx_interrupt, NULL, vdev);
vdev->intx.kvm_accel = false;
/* If we've missed an event, let it re-fire through QEMU */
vfio_unmask_intx(vdev);
DPRINTF("%s(%04x:%02x:%02x.%x) KVM INTx accel disabled\n",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);
#endif
}
static void vfio_update_irq(PCIDevice *pdev)
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
PCIINTxRoute route;
if (vdev->interrupt != VFIO_INT_INTx) {
return;
}
route = pci_device_route_intx_to_irq(&vdev->pdev, vdev->intx.pin);
if (!pci_intx_route_changed(&vdev->intx.route, &route)) {
return; /* Nothing changed */
}
DPRINTF("%s(%04x:%02x:%02x.%x) IRQ moved %d -> %d\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, vdev->intx.route.irq, route.irq);
vfio_disable_intx_kvm(vdev);
vdev->intx.route = route;
if (route.mode != PCI_INTX_ENABLED) {
return;
}
vfio_enable_intx_kvm(vdev);
/* Re-enable the interrupt in cased we missed an EOI */
vfio_eoi(vdev);
}
static int vfio_enable_intx(VFIODevice *vdev)
{
uint8_t pin = vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1);
int ret, argsz;
struct vfio_irq_set *irq_set;
int32_t *pfd;
if (!pin) {
return 0;
}
vfio_disable_interrupts(vdev);
vdev->intx.pin = pin - 1; /* Pin A (1) -> irq[0] */
pci_config_set_interrupt_pin(vdev->pdev.config, pin);
#ifdef CONFIG_KVM
/*
* Only conditional to avoid generating error messages on platforms
* where we won't actually use the result anyway.
*/
if (kvm_irqfds_enabled() &&
kvm_check_extension(kvm_state, KVM_CAP_IRQFD_RESAMPLE)) {
vdev->intx.route = pci_device_route_intx_to_irq(&vdev->pdev,
vdev->intx.pin);
}
#endif
ret = event_notifier_init(&vdev->intx.interrupt, 0);
if (ret) {
error_report("vfio: Error: event_notifier_init failed");
return ret;
}
argsz = sizeof(*irq_set) + sizeof(*pfd);
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
irq_set->start = 0;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
*pfd = event_notifier_get_fd(&vdev->intx.interrupt);
qemu_set_fd_handler(*pfd, vfio_intx_interrupt, NULL, vdev);
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
if (ret) {
error_report("vfio: Error: Failed to setup INTx fd: %m");
qemu_set_fd_handler(*pfd, NULL, NULL, vdev);
event_notifier_cleanup(&vdev->intx.interrupt);
return -errno;
}
vfio_enable_intx_kvm(vdev);
vdev->interrupt = VFIO_INT_INTx;
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
return 0;
}
static void vfio_disable_intx(VFIODevice *vdev)
{
int fd;
timer_del(vdev->intx.mmap_timer);
vfio_disable_intx_kvm(vdev);
vfio_disable_irqindex(vdev, VFIO_PCI_INTX_IRQ_INDEX);
vdev->intx.pending = false;
pci_irq_deassert(&vdev->pdev);
vfio_mmap_set_enabled(vdev, true);
fd = event_notifier_get_fd(&vdev->intx.interrupt);
qemu_set_fd_handler(fd, NULL, NULL, vdev);
event_notifier_cleanup(&vdev->intx.interrupt);
vdev->interrupt = VFIO_INT_NONE;
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
}
/*
* MSI/X
*/
static void vfio_msi_interrupt(void *opaque)
{
VFIOMSIVector *vector = opaque;
VFIODevice *vdev = vector->vdev;
int nr = vector - vdev->msi_vectors;
if (!event_notifier_test_and_clear(&vector->interrupt)) {
return;
}
#ifdef VFIO_DEBUG
MSIMessage msg;
if (vdev->interrupt == VFIO_INT_MSIX) {
msg = msi_get_message(&vdev->pdev, nr);
} else if (vdev->interrupt == VFIO_INT_MSI) {
msg = msix_get_message(&vdev->pdev, nr);
} else {
abort();
}
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d 0x%"PRIx64"/0x%x\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, nr, msg.address, msg.data);
#endif
if (vdev->interrupt == VFIO_INT_MSIX) {
msix_notify(&vdev->pdev, nr);
} else if (vdev->interrupt == VFIO_INT_MSI) {
msi_notify(&vdev->pdev, nr);
} else {
error_report("vfio: MSI interrupt receieved, but not enabled?");
}
}
static int vfio_enable_vectors(VFIODevice *vdev, bool msix)
{
struct vfio_irq_set *irq_set;
int ret = 0, i, argsz;
int32_t *fds;
argsz = sizeof(*irq_set) + (vdev->nr_vectors * sizeof(*fds));
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
irq_set->index = msix ? VFIO_PCI_MSIX_IRQ_INDEX : VFIO_PCI_MSI_IRQ_INDEX;
irq_set->start = 0;
irq_set->count = vdev->nr_vectors;
fds = (int32_t *)&irq_set->data;
for (i = 0; i < vdev->nr_vectors; i++) {
if (!vdev->msi_vectors[i].use) {
fds[i] = -1;
continue;
}
fds[i] = event_notifier_get_fd(&vdev->msi_vectors[i].interrupt);
}
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
return ret;
}
static int vfio_msix_vector_do_use(PCIDevice *pdev, unsigned int nr,
MSIMessage *msg, IOHandler *handler)
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
VFIOMSIVector *vector;
int ret;
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d used\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, nr);
vector = &vdev->msi_vectors[nr];
vector->vdev = vdev;
vector->use = true;
msix_vector_use(pdev, nr);
if (event_notifier_init(&vector->interrupt, 0)) {
error_report("vfio: Error: event_notifier_init failed");
}
/*
* Attempt to enable route through KVM irqchip,
* default to userspace handling if unavailable.
*/
vector->virq = msg && VFIO_ALLOW_KVM_MSIX ?
kvm_irqchip_add_msi_route(kvm_state, *msg) : -1;
if (vector->virq < 0 ||
kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt,
NULL, vector->virq) < 0) {
if (vector->virq >= 0) {
kvm_irqchip_release_virq(kvm_state, vector->virq);
vector->virq = -1;
}
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
handler, NULL, vector);
}
/*
* We don't want to have the host allocate all possible MSI vectors
* for a device if they're not in use, so we shutdown and incrementally
* increase them as needed.
*/
if (vdev->nr_vectors < nr + 1) {
vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX);
vdev->nr_vectors = nr + 1;
ret = vfio_enable_vectors(vdev, true);
if (ret) {
error_report("vfio: failed to enable vectors, %d", ret);
}
} else {
int argsz;
struct vfio_irq_set *irq_set;
int32_t *pfd;
argsz = sizeof(*irq_set) + sizeof(*pfd);
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
VFIO_IRQ_SET_ACTION_TRIGGER;
irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
irq_set->start = nr;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
*pfd = event_notifier_get_fd(&vector->interrupt);
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
if (ret) {
error_report("vfio: failed to modify vector, %d", ret);
}
}
return 0;
}
static int vfio_msix_vector_use(PCIDevice *pdev,
unsigned int nr, MSIMessage msg)
{
return vfio_msix_vector_do_use(pdev, nr, &msg, vfio_msi_interrupt);
}
static void vfio_msix_vector_release(PCIDevice *pdev, unsigned int nr)
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
VFIOMSIVector *vector = &vdev->msi_vectors[nr];
int argsz;
struct vfio_irq_set *irq_set;
int32_t *pfd;
DPRINTF("%s(%04x:%02x:%02x.%x) vector %d released\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, nr);
/*
* XXX What's the right thing to do here? This turns off the interrupt
* completely, but do we really just want to switch the interrupt to
* bouncing through userspace and let msix.c drop it? Not sure.
*/
msix_vector_unuse(pdev, nr);
argsz = sizeof(*irq_set) + sizeof(*pfd);
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
VFIO_IRQ_SET_ACTION_TRIGGER;
irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
irq_set->start = nr;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
*pfd = -1;
ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
g_free(irq_set);
if (vector->virq < 0) {
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
NULL, NULL, NULL);
} else {
kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt,
vector->virq);
kvm_irqchip_release_virq(kvm_state, vector->virq);
vector->virq = -1;
}
event_notifier_cleanup(&vector->interrupt);
vector->use = false;
}
static void vfio_enable_msix(VFIODevice *vdev)
{
vfio_disable_interrupts(vdev);
vdev->msi_vectors = g_malloc0(vdev->msix->entries * sizeof(VFIOMSIVector));
vdev->interrupt = VFIO_INT_MSIX;
/*
* Some communication channels between VF & PF or PF & fw rely on the
* physical state of the device and expect that enabling MSI-X from the
* guest enables the same on the host. When our guest is Linux, the
* guest driver call to pci_enable_msix() sets the enabling bit in the
* MSI-X capability, but leaves the vector table masked. We therefore
* can't rely on a vector_use callback (from request_irq() in the guest)
* to switch the physical device into MSI-X mode because that may come a
* long time after pci_enable_msix(). This code enables vector 0 with
* triggering to userspace, then immediately release the vector, leaving
* the physical device with no vectors enabled, but MSI-X enabled, just
* like the guest view.
*/
vfio_msix_vector_do_use(&vdev->pdev, 0, NULL, NULL);
vfio_msix_vector_release(&vdev->pdev, 0);
if (msix_set_vector_notifiers(&vdev->pdev, vfio_msix_vector_use,
vfio_msix_vector_release, NULL)) {
error_report("vfio: msix_set_vector_notifiers failed");
}
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
}
static void vfio_enable_msi(VFIODevice *vdev)
{
int ret, i;
vfio_disable_interrupts(vdev);
vdev->nr_vectors = msi_nr_vectors_allocated(&vdev->pdev);
retry:
vdev->msi_vectors = g_malloc0(vdev->nr_vectors * sizeof(VFIOMSIVector));
for (i = 0; i < vdev->nr_vectors; i++) {
VFIOMSIVector *vector = &vdev->msi_vectors[i];
vector->vdev = vdev;
vector->use = true;
if (event_notifier_init(&vector->interrupt, 0)) {
error_report("vfio: Error: event_notifier_init failed");
}
vector->msg = msi_get_message(&vdev->pdev, i);
/*
* Attempt to enable route through KVM irqchip,
* default to userspace handling if unavailable.
*/
vector->virq = VFIO_ALLOW_KVM_MSI ?
kvm_irqchip_add_msi_route(kvm_state, vector->msg) : -1;
if (vector->virq < 0 ||
kvm_irqchip_add_irqfd_notifier(kvm_state, &vector->interrupt,
NULL, vector->virq) < 0) {
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
vfio_msi_interrupt, NULL, vector);
}
}
ret = vfio_enable_vectors(vdev, false);
if (ret) {
if (ret < 0) {
error_report("vfio: Error: Failed to setup MSI fds: %m");
} else if (ret != vdev->nr_vectors) {
error_report("vfio: Error: Failed to enable %d "
"MSI vectors, retry with %d", vdev->nr_vectors, ret);
}
for (i = 0; i < vdev->nr_vectors; i++) {
VFIOMSIVector *vector = &vdev->msi_vectors[i];
if (vector->virq >= 0) {
kvm_irqchip_remove_irqfd_notifier(kvm_state, &vector->interrupt,
vector->virq);
kvm_irqchip_release_virq(kvm_state, vector->virq);
vector->virq = -1;
} else {
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
NULL, NULL, NULL);
}
event_notifier_cleanup(&vector->interrupt);
}
g_free(vdev->msi_vectors);
if (ret > 0 && ret != vdev->nr_vectors) {
vdev->nr_vectors = ret;
goto retry;
}
vdev->nr_vectors = 0;
return;
}
vdev->interrupt = VFIO_INT_MSI;
DPRINTF("%s(%04x:%02x:%02x.%x) Enabled %d MSI vectors\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, vdev->nr_vectors);
}
static void vfio_disable_msi_common(VFIODevice *vdev)
{
g_free(vdev->msi_vectors);
vdev->msi_vectors = NULL;
vdev->nr_vectors = 0;
vdev->interrupt = VFIO_INT_NONE;
vfio_enable_intx(vdev);
}
static void vfio_disable_msix(VFIODevice *vdev)
{
int i;
msix_unset_vector_notifiers(&vdev->pdev);
/*
* MSI-X will only release vectors if MSI-X is still enabled on the
* device, check through the rest and release it ourselves if necessary.
*/
for (i = 0; i < vdev->nr_vectors; i++) {
if (vdev->msi_vectors[i].use) {
vfio_msix_vector_release(&vdev->pdev, i);
}
}
if (vdev->nr_vectors) {
vfio_disable_irqindex(vdev, VFIO_PCI_MSIX_IRQ_INDEX);
}
vfio_disable_msi_common(vdev);
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
}
static void vfio_disable_msi(VFIODevice *vdev)
{
int i;
vfio_disable_irqindex(vdev, VFIO_PCI_MSI_IRQ_INDEX);
for (i = 0; i < vdev->nr_vectors; i++) {
VFIOMSIVector *vector = &vdev->msi_vectors[i];
if (!vector->use) {
continue;
}
if (vector->virq >= 0) {
kvm_irqchip_remove_irqfd_notifier(kvm_state,
&vector->interrupt, vector->virq);
kvm_irqchip_release_virq(kvm_state, vector->virq);
vector->virq = -1;
} else {
qemu_set_fd_handler(event_notifier_get_fd(&vector->interrupt),
NULL, NULL, NULL);
}
event_notifier_cleanup(&vector->interrupt);
}
vfio_disable_msi_common(vdev);
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
}
static void vfio_update_msi(VFIODevice *vdev)
{
int i;
for (i = 0; i < vdev->nr_vectors; i++) {
VFIOMSIVector *vector = &vdev->msi_vectors[i];
MSIMessage msg;
if (!vector->use || vector->virq < 0) {
continue;
}
msg = msi_get_message(&vdev->pdev, i);
if (msg.address != vector->msg.address ||
msg.data != vector->msg.data) {
DPRINTF("%s(%04x:%02x:%02x.%x) MSI vector %d changed\n",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function, i);
kvm_irqchip_update_msi_route(kvm_state, vector->virq, msg);
vector->msg = msg;
}
}
}
/*
* IO Port/MMIO - Beware of the endians, VFIO is always little endian
*/
static void vfio_bar_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOBAR *bar = opaque;
union {
uint8_t byte;
uint16_t word;
uint32_t dword;
uint64_t qword;
} buf;
switch (size) {
case 1:
buf.byte = data;
break;
case 2:
buf.word = cpu_to_le16(data);
break;
case 4:
buf.dword = cpu_to_le32(data);
break;
default:
hw_error("vfio: unsupported write size, %d bytes\n", size);
break;
}
if (pwrite(bar->fd, &buf, size, bar->fd_offset + addr) != size) {
error_report("%s(,0x%"HWADDR_PRIx", 0x%"PRIx64", %d) failed: %m",
__func__, addr, data, size);
}
#ifdef DEBUG_VFIO
{
VFIODevice *vdev = container_of(bar, VFIODevice, bars[bar->nr]);
DPRINTF("%s(%04x:%02x:%02x.%x:BAR%d+0x%"HWADDR_PRIx", 0x%"PRIx64
", %d)\n", __func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function, bar->nr, addr,
data, size);
}
#endif
/*
* A read or write to a BAR always signals an INTx EOI. This will
* do nothing if not pending (including not in INTx mode). We assume
* that a BAR access is in response to an interrupt and that BAR
* accesses will service the interrupt. Unfortunately, we don't know
* which access will service the interrupt, so we're potentially
* getting quite a few host interrupts per guest interrupt.
*/
vfio_eoi(container_of(bar, VFIODevice, bars[bar->nr]));
}
static uint64_t vfio_bar_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOBAR *bar = opaque;
union {
uint8_t byte;
uint16_t word;
uint32_t dword;
uint64_t qword;
} buf;
uint64_t data = 0;
if (pread(bar->fd, &buf, size, bar->fd_offset + addr) != size) {
error_report("%s(,0x%"HWADDR_PRIx", %d) failed: %m",
__func__, addr, size);
return (uint64_t)-1;
}
switch (size) {
case 1:
data = buf.byte;
break;
case 2:
data = le16_to_cpu(buf.word);
break;
case 4:
data = le32_to_cpu(buf.dword);
break;
default:
hw_error("vfio: unsupported read size, %d bytes\n", size);
break;
}
#ifdef DEBUG_VFIO
{
VFIODevice *vdev = container_of(bar, VFIODevice, bars[bar->nr]);
DPRINTF("%s(%04x:%02x:%02x.%x:BAR%d+0x%"HWADDR_PRIx
", %d) = 0x%"PRIx64"\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
bar->nr, addr, size, data);
}
#endif
/* Same as write above */
vfio_eoi(container_of(bar, VFIODevice, bars[bar->nr]));
return data;
}
static const MemoryRegionOps vfio_bar_ops = {
.read = vfio_bar_read,
.write = vfio_bar_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_pci_load_rom(VFIODevice *vdev)
{
struct vfio_region_info reg_info = {
.argsz = sizeof(reg_info),
.index = VFIO_PCI_ROM_REGION_INDEX
};
uint64_t size;
off_t off = 0;
size_t bytes;
if (ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info)) {
error_report("vfio: Error getting ROM info: %m");
return;
}
DPRINTF("Device %04x:%02x:%02x.%x ROM:\n", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
(unsigned long)reg_info.size, (unsigned long)reg_info.offset,
(unsigned long)reg_info.flags);
vdev->rom_size = size = reg_info.size;
vdev->rom_offset = reg_info.offset;
if (!vdev->rom_size) {
vdev->rom_read_failed = true;
error_report("vfio-pci: Cannot read device rom at "
"%04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
error_printf("Device option ROM contents are probably invalid "
"(check dmesg).\nSkip option ROM probe with rombar=0, "
"or load from file with romfile=\n");
return;
}
vdev->rom = g_malloc(size);
memset(vdev->rom, 0xff, size);
while (size) {
bytes = pread(vdev->fd, vdev->rom + off, size, vdev->rom_offset + off);
if (bytes == 0) {
break;
} else if (bytes > 0) {
off += bytes;
size -= bytes;
} else {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
error_report("vfio: Error reading device ROM: %m");
break;
}
}
}
static uint64_t vfio_rom_read(void *opaque, hwaddr addr, unsigned size)
{
VFIODevice *vdev = opaque;
uint64_t val = ((uint64_t)1 << (size * 8)) - 1;
/* Load the ROM lazily when the guest tries to read it */
if (unlikely(!vdev->rom)) {
vfio_pci_load_rom(vdev);
if (unlikely(!vdev->rom && !vdev->rom_read_failed)) {
vfio_pci_load_rom(vdev);
}
}
memcpy(&val, vdev->rom + addr,
(addr < vdev->rom_size) ? MIN(size, vdev->rom_size - addr) : 0);
DPRINTF("%s(%04x:%02x:%02x.%x, 0x%"HWADDR_PRIx", 0x%x) = 0x%"PRIx64"\n",
__func__, vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, addr, size, val);
return val;
}
static void vfio_rom_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
}
static const MemoryRegionOps vfio_rom_ops = {
.read = vfio_rom_read,
.write = vfio_rom_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_pci_size_rom(VFIODevice *vdev)
{
uint32_t orig, size = cpu_to_le32((uint32_t)PCI_ROM_ADDRESS_MASK);
off_t offset = vdev->config_offset + PCI_ROM_ADDRESS;
char name[32];
if (vdev->pdev.romfile || !vdev->pdev.rom_bar) {
return;
}
/*
* Use the same size ROM BAR as the physical device. The contents
* will get filled in later when the guest tries to read it.
*/
if (pread(vdev->fd, &orig, 4, offset) != 4 ||
pwrite(vdev->fd, &size, 4, offset) != 4 ||
pread(vdev->fd, &size, 4, offset) != 4 ||
pwrite(vdev->fd, &orig, 4, offset) != 4) {
error_report("%s(%04x:%02x:%02x.%x) failed: %m",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);
return;
}
size = ~(le32_to_cpu(size) & PCI_ROM_ADDRESS_MASK) + 1;
if (!size) {
return;
}
DPRINTF("%04x:%02x:%02x.%x ROM size 0x%x\n", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function, size);
snprintf(name, sizeof(name), "vfio[%04x:%02x:%02x.%x].rom",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
memory_region_init_io(&vdev->pdev.rom, OBJECT(vdev),
&vfio_rom_ops, vdev, name, size);
pci_register_bar(&vdev->pdev, PCI_ROM_SLOT,
PCI_BASE_ADDRESS_SPACE_MEMORY, &vdev->pdev.rom);
vdev->pdev.has_rom = true;
vdev->rom_read_failed = false;
}
static void vfio_vga_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOVGARegion *region = opaque;
VFIOVGA *vga = container_of(region, VFIOVGA, region[region->nr]);
union {
uint8_t byte;
uint16_t word;
uint32_t dword;
uint64_t qword;
} buf;
off_t offset = vga->fd_offset + region->offset + addr;
switch (size) {
case 1:
buf.byte = data;
break;
case 2:
buf.word = cpu_to_le16(data);
break;
case 4:
buf.dword = cpu_to_le32(data);
break;
default:
hw_error("vfio: unsupported write size, %d bytes\n", size);
break;
}
if (pwrite(vga->fd, &buf, size, offset) != size) {
error_report("%s(,0x%"HWADDR_PRIx", 0x%"PRIx64", %d) failed: %m",
__func__, region->offset + addr, data, size);
}
DPRINTF("%s(0x%"HWADDR_PRIx", 0x%"PRIx64", %d)\n",
__func__, region->offset + addr, data, size);
}
static uint64_t vfio_vga_read(void *opaque, hwaddr addr, unsigned size)
{
VFIOVGARegion *region = opaque;
VFIOVGA *vga = container_of(region, VFIOVGA, region[region->nr]);
union {
uint8_t byte;
uint16_t word;
uint32_t dword;
uint64_t qword;
} buf;
uint64_t data = 0;
off_t offset = vga->fd_offset + region->offset + addr;
if (pread(vga->fd, &buf, size, offset) != size) {
error_report("%s(,0x%"HWADDR_PRIx", %d) failed: %m",
__func__, region->offset + addr, size);
return (uint64_t)-1;
}
switch (size) {
case 1:
data = buf.byte;
break;
case 2:
data = le16_to_cpu(buf.word);
break;
case 4:
data = le32_to_cpu(buf.dword);
break;
default:
hw_error("vfio: unsupported read size, %d bytes\n", size);
break;
}
DPRINTF("%s(0x%"HWADDR_PRIx", %d) = 0x%"PRIx64"\n",
__func__, region->offset + addr, size, data);
return data;
}
static const MemoryRegionOps vfio_vga_ops = {
.read = vfio_vga_read,
.write = vfio_vga_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/*
* Device specific quirks
*/
/* Is range1 fully contained within range2? */
static bool vfio_range_contained(uint64_t first1, uint64_t len1,
uint64_t first2, uint64_t len2) {
return (first1 >= first2 && first1 + len1 <= first2 + len2);
}
static bool vfio_flags_enabled(uint8_t flags, uint8_t mask)
{
return (mask && (flags & mask) == mask);
}
static uint64_t vfio_generic_window_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
uint64_t data;
if (vfio_flags_enabled(quirk->data.flags, quirk->data.read_flags) &&
ranges_overlap(addr, size,
quirk->data.data_offset, quirk->data.data_size)) {
hwaddr offset = addr - quirk->data.data_offset;
if (!vfio_range_contained(addr, size, quirk->data.data_offset,
quirk->data.data_size)) {
hw_error("%s: window data read not fully contained: %s\n",
__func__, memory_region_name(&quirk->mem));
}
data = vfio_pci_read_config(&vdev->pdev,
quirk->data.address_val + offset, size);
DPRINTF("%s read(%04x:%02x:%02x.%x:BAR%d+0x%"HWADDR_PRIx", %d) = 0x%"
PRIx64"\n", memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
quirk->data.bar, addr, size, data);
} else {
data = vfio_bar_read(&vdev->bars[quirk->data.bar],
addr + quirk->data.base_offset, size);
}
return data;
}
static void vfio_generic_window_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
if (ranges_overlap(addr, size,
quirk->data.address_offset, quirk->data.address_size)) {
if (addr != quirk->data.address_offset) {
hw_error("%s: offset write into address window: %s\n",
__func__, memory_region_name(&quirk->mem));
}
if ((data & ~quirk->data.address_mask) == quirk->data.address_match) {
quirk->data.flags |= quirk->data.write_flags |
quirk->data.read_flags;
quirk->data.address_val = data & quirk->data.address_mask;
} else {
quirk->data.flags &= ~(quirk->data.write_flags |
quirk->data.read_flags);
}
}
if (vfio_flags_enabled(quirk->data.flags, quirk->data.write_flags) &&
ranges_overlap(addr, size,
quirk->data.data_offset, quirk->data.data_size)) {
hwaddr offset = addr - quirk->data.data_offset;
if (!vfio_range_contained(addr, size, quirk->data.data_offset,
quirk->data.data_size)) {
hw_error("%s: window data write not fully contained: %s\n",
__func__, memory_region_name(&quirk->mem));
}
vfio_pci_write_config(&vdev->pdev,
quirk->data.address_val + offset, data, size);
DPRINTF("%s write(%04x:%02x:%02x.%x:BAR%d+0x%"HWADDR_PRIx", 0x%"
PRIx64", %d)\n", memory_region_name(&quirk->mem),
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, quirk->data.bar, addr, data, size);
return;
}
vfio_bar_write(&vdev->bars[quirk->data.bar],
addr + quirk->data.base_offset, data, size);
}
static const MemoryRegionOps vfio_generic_window_quirk = {
.read = vfio_generic_window_quirk_read,
.write = vfio_generic_window_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_generic_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
hwaddr base = quirk->data.address_match & TARGET_PAGE_MASK;
hwaddr offset = quirk->data.address_match & ~TARGET_PAGE_MASK;
uint64_t data;
if (vfio_flags_enabled(quirk->data.flags, quirk->data.read_flags) &&
ranges_overlap(addr, size, offset, quirk->data.address_mask + 1)) {
if (!vfio_range_contained(addr, size, offset,
quirk->data.address_mask + 1)) {
hw_error("%s: read not fully contained: %s\n",
__func__, memory_region_name(&quirk->mem));
}
data = vfio_pci_read_config(&vdev->pdev, addr - offset, size);
DPRINTF("%s read(%04x:%02x:%02x.%x:BAR%d+0x%"HWADDR_PRIx", %d) = 0x%"
PRIx64"\n", memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
quirk->data.bar, addr + base, size, data);
} else {
data = vfio_bar_read(&vdev->bars[quirk->data.bar], addr + base, size);
}
return data;
}
static void vfio_generic_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
hwaddr base = quirk->data.address_match & TARGET_PAGE_MASK;
hwaddr offset = quirk->data.address_match & ~TARGET_PAGE_MASK;
if (vfio_flags_enabled(quirk->data.flags, quirk->data.write_flags) &&
ranges_overlap(addr, size, offset, quirk->data.address_mask + 1)) {
if (!vfio_range_contained(addr, size, offset,
quirk->data.address_mask + 1)) {
hw_error("%s: write not fully contained: %s\n",
__func__, memory_region_name(&quirk->mem));
}
vfio_pci_write_config(&vdev->pdev, addr - offset, data, size);
DPRINTF("%s write(%04x:%02x:%02x.%x:BAR%d+0x%"HWADDR_PRIx", 0x%"
PRIx64", %d)\n", memory_region_name(&quirk->mem),
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, quirk->data.bar, addr + base, data, size);
} else {
vfio_bar_write(&vdev->bars[quirk->data.bar], addr + base, data, size);
}
}
static const MemoryRegionOps vfio_generic_quirk = {
.read = vfio_generic_quirk_read,
.write = vfio_generic_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
#define PCI_VENDOR_ID_ATI 0x1002
/*
* Radeon HD cards (HD5450 & HD7850) report the upper byte of the I/O port BAR
* through VGA register 0x3c3. On newer cards, the I/O port BAR is always
* BAR4 (older cards like the X550 used BAR1, but we don't care to support
* those). Note that on bare metal, a read of 0x3c3 doesn't always return the
* I/O port BAR address. Originally this was coded to return the virtual BAR
* address only if the physical register read returns the actual BAR address,
* but users have reported greater success if we return the virtual address
* unconditionally.
*/
static uint64_t vfio_ati_3c3_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
uint64_t data = vfio_pci_read_config(&vdev->pdev,
PCI_BASE_ADDRESS_0 + (4 * 4) + 1,
size);
DPRINTF("%s(0x3c3, 1) = 0x%"PRIx64"\n", __func__, data);
return data;
}
static const MemoryRegionOps vfio_ati_3c3_quirk = {
.read = vfio_ati_3c3_quirk_read,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_vga_probe_ati_3c3_quirk(VFIODevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_ATI) {
return;
}
/*
* As long as the BAR is >= 256 bytes it will be aligned such that the
* lower byte is always zero. Filter out anything else, if it exists.
*/
if (!vdev->bars[4].ioport || vdev->bars[4].size < 256) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_ati_3c3_quirk, quirk,
"vfio-ati-3c3-quirk", 1);
memory_region_add_subregion(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem,
3 /* offset 3 bytes from 0x3c0 */, &quirk->mem);
QLIST_INSERT_HEAD(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks,
quirk, next);
DPRINTF("Enabled ATI/AMD quirk 0x3c3 BAR4for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
/*
* Newer ATI/AMD devices, including HD5450 and HD7850, have a window to PCI
* config space through MMIO BAR2 at offset 0x4000. Nothing seems to access
* the MMIO space directly, but a window to this space is provided through
* I/O port BAR4. Offset 0x0 is the address register and offset 0x4 is the
* data register. When the address is programmed to a range of 0x4000-0x4fff
* PCI configuration space is available. Experimentation seems to indicate
* that only read-only access is provided, but we drop writes when the window
* is enabled to config space nonetheless.
*/
static void vfio_probe_ati_bar4_window_quirk(VFIODevice *vdev, int nr)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (!vdev->has_vga || nr != 4 ||
pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_ATI) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.address_size = 4;
quirk->data.data_offset = 4;
quirk->data.data_size = 4;
quirk->data.address_match = 0x4000;
quirk->data.address_mask = PCIE_CONFIG_SPACE_SIZE - 1;
quirk->data.bar = nr;
quirk->data.read_flags = quirk->data.write_flags = 1;
memory_region_init_io(&quirk->mem, OBJECT(vdev),
&vfio_generic_window_quirk, quirk,
"vfio-ati-bar4-window-quirk", 8);
memory_region_add_subregion_overlap(&vdev->bars[nr].mem,
quirk->data.base_offset, &quirk->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
DPRINTF("Enabled ATI/AMD BAR4 window quirk for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
/*
* Trap the BAR2 MMIO window to config space as well.
*/
static void vfio_probe_ati_bar2_4000_quirk(VFIODevice *vdev, int nr)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
/* Only enable on newer devices where BAR2 is 64bit */
if (!vdev->has_vga || nr != 2 || !vdev->bars[2].mem64 ||
pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_ATI) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.flags = quirk->data.read_flags = quirk->data.write_flags = 1;
quirk->data.address_match = 0x4000;
quirk->data.address_mask = PCIE_CONFIG_SPACE_SIZE - 1;
quirk->data.bar = nr;
memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_generic_quirk, quirk,
"vfio-ati-bar2-4000-quirk",
TARGET_PAGE_ALIGN(quirk->data.address_mask + 1));
memory_region_add_subregion_overlap(&vdev->bars[nr].mem,
quirk->data.address_match & TARGET_PAGE_MASK,
&quirk->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
DPRINTF("Enabled ATI/AMD BAR2 0x4000 quirk for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
/*
* Older ATI/AMD cards like the X550 have a similar window to that above.
* I/O port BAR1 provides a window to a mirror of PCI config space located
* in BAR2 at offset 0xf00. We don't care to support such older cards, but
* note it for future reference.
*/
#define PCI_VENDOR_ID_NVIDIA 0x10de
/*
* Nvidia has several different methods to get to config space, the
* nouveu project has several of these documented here:
* https://github.com/pathscale/envytools/tree/master/hwdocs
*
* The first quirk is actually not documented in envytools and is found
* on 10de:01d1 (NVIDIA Corporation G72 [GeForce 7300 LE]). This is an
* NV46 chipset. The backdoor uses the legacy VGA I/O ports to access
* the mirror of PCI config space found at BAR0 offset 0x1800. The access
* sequence first writes 0x338 to I/O port 0x3d4. The target offset is
* then written to 0x3d0. Finally 0x538 is written for a read and 0x738
* is written for a write to 0x3d4. The BAR0 offset is then accessible
* through 0x3d0. This quirk doesn't seem to be necessary on newer cards
* that use the I/O port BAR5 window but it doesn't hurt to leave it.
*/
enum {
NV_3D0_NONE = 0,
NV_3D0_SELECT,
NV_3D0_WINDOW,
NV_3D0_READ,
NV_3D0_WRITE,
};
static uint64_t vfio_nvidia_3d0_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
PCIDevice *pdev = &vdev->pdev;
uint64_t data = vfio_vga_read(&vdev->vga.region[QEMU_PCI_VGA_IO_HI],
addr + quirk->data.base_offset, size);
if (quirk->data.flags == NV_3D0_READ && addr == quirk->data.data_offset) {
data = vfio_pci_read_config(pdev, quirk->data.address_val, size);
DPRINTF("%s(0x3d0, %d) = 0x%"PRIx64"\n", __func__, size, data);
}
quirk->data.flags = NV_3D0_NONE;
return data;
}
static void vfio_nvidia_3d0_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
PCIDevice *pdev = &vdev->pdev;
switch (quirk->data.flags) {
case NV_3D0_NONE:
if (addr == quirk->data.address_offset && data == 0x338) {
quirk->data.flags = NV_3D0_SELECT;
}
break;
case NV_3D0_SELECT:
quirk->data.flags = NV_3D0_NONE;
if (addr == quirk->data.data_offset &&
(data & ~quirk->data.address_mask) == quirk->data.address_match) {
quirk->data.flags = NV_3D0_WINDOW;
quirk->data.address_val = data & quirk->data.address_mask;
}
break;
case NV_3D0_WINDOW:
quirk->data.flags = NV_3D0_NONE;
if (addr == quirk->data.address_offset) {
if (data == 0x538) {
quirk->data.flags = NV_3D0_READ;
} else if (data == 0x738) {
quirk->data.flags = NV_3D0_WRITE;
}
}
break;
case NV_3D0_WRITE:
quirk->data.flags = NV_3D0_NONE;
if (addr == quirk->data.data_offset) {
vfio_pci_write_config(pdev, quirk->data.address_val, data, size);
DPRINTF("%s(0x3d0, 0x%"PRIx64", %d)\n", __func__, data, size);
return;
}
break;
}
vfio_vga_write(&vdev->vga.region[QEMU_PCI_VGA_IO_HI],
addr + quirk->data.base_offset, data, size);
}
static const MemoryRegionOps vfio_nvidia_3d0_quirk = {
.read = vfio_nvidia_3d0_quirk_read,
.write = vfio_nvidia_3d0_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_vga_probe_nvidia_3d0_quirk(VFIODevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA ||
!vdev->bars[1].size) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.base_offset = 0x10;
quirk->data.address_offset = 4;
quirk->data.address_size = 2;
quirk->data.address_match = 0x1800;
quirk->data.address_mask = PCI_CONFIG_SPACE_SIZE - 1;
quirk->data.data_offset = 0;
quirk->data.data_size = 4;
memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_nvidia_3d0_quirk,
quirk, "vfio-nvidia-3d0-quirk", 6);
memory_region_add_subregion(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem,
quirk->data.base_offset, &quirk->mem);
QLIST_INSERT_HEAD(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks,
quirk, next);
DPRINTF("Enabled NVIDIA VGA 0x3d0 quirk for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
/*
* The second quirk is documented in envytools. The I/O port BAR5 is just
* a set of address/data ports to the MMIO BARs. The BAR we care about is
* again BAR0. This backdoor is apparently a bit newer than the one above
* so we need to not only trap 256 bytes @0x1800, but all of PCI config
* space, including extended space is available at the 4k @0x88000.
*/
enum {
NV_BAR5_ADDRESS = 0x1,
NV_BAR5_ENABLE = 0x2,
NV_BAR5_MASTER = 0x4,
NV_BAR5_VALID = 0x7,
};
static void vfio_nvidia_bar5_window_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOQuirk *quirk = opaque;
switch (addr) {
case 0x0:
if (data & 0x1) {
quirk->data.flags |= NV_BAR5_MASTER;
} else {
quirk->data.flags &= ~NV_BAR5_MASTER;
}
break;
case 0x4:
if (data & 0x1) {
quirk->data.flags |= NV_BAR5_ENABLE;
} else {
quirk->data.flags &= ~NV_BAR5_ENABLE;
}
break;
case 0x8:
if (quirk->data.flags & NV_BAR5_MASTER) {
if ((data & ~0xfff) == 0x88000) {
quirk->data.flags |= NV_BAR5_ADDRESS;
quirk->data.address_val = data & 0xfff;
} else if ((data & ~0xff) == 0x1800) {
quirk->data.flags |= NV_BAR5_ADDRESS;
quirk->data.address_val = data & 0xff;
} else {
quirk->data.flags &= ~NV_BAR5_ADDRESS;
}
}
break;
}
vfio_generic_window_quirk_write(opaque, addr, data, size);
}
static const MemoryRegionOps vfio_nvidia_bar5_window_quirk = {
.read = vfio_generic_window_quirk_read,
.write = vfio_nvidia_bar5_window_quirk_write,
.valid.min_access_size = 4,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_nvidia_bar5_window_quirk(VFIODevice *vdev, int nr)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (!vdev->has_vga || nr != 5 ||
pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.read_flags = quirk->data.write_flags = NV_BAR5_VALID;
quirk->data.address_offset = 0x8;
quirk->data.address_size = 0; /* actually 4, but avoids generic code */
quirk->data.data_offset = 0xc;
quirk->data.data_size = 4;
quirk->data.bar = nr;
memory_region_init_io(&quirk->mem, OBJECT(vdev),
&vfio_nvidia_bar5_window_quirk, quirk,
"vfio-nvidia-bar5-window-quirk", 16);
memory_region_add_subregion_overlap(&vdev->bars[nr].mem, 0, &quirk->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
DPRINTF("Enabled NVIDIA BAR5 window quirk for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
static void vfio_nvidia_88000_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
PCIDevice *pdev = &vdev->pdev;
hwaddr base = quirk->data.address_match & TARGET_PAGE_MASK;
vfio_generic_quirk_write(opaque, addr, data, size);
/*
* Nvidia seems to acknowledge MSI interrupts by writing 0xff to the
* MSI capability ID register. Both the ID and next register are
* read-only, so we allow writes covering either of those to real hw.
* NB - only fixed for the 0x88000 MMIO window.
*/
if ((pdev->cap_present & QEMU_PCI_CAP_MSI) &&
vfio_range_contained(addr, size, pdev->msi_cap, PCI_MSI_FLAGS)) {
vfio_bar_write(&vdev->bars[quirk->data.bar], addr + base, data, size);
}
}
static const MemoryRegionOps vfio_nvidia_88000_quirk = {
.read = vfio_generic_quirk_read,
.write = vfio_nvidia_88000_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/*
* Finally, BAR0 itself. We want to redirect any accesses to either
* 0x1800 or 0x88000 through the PCI config space access functions.
*
* NB - quirk at a page granularity or else they don't seem to work when
* BARs are mmap'd
*
* Here's offset 0x88000...
*/
static void vfio_probe_nvidia_bar0_88000_quirk(VFIODevice *vdev, int nr)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (!vdev->has_vga || nr != 0 ||
pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.flags = quirk->data.read_flags = quirk->data.write_flags = 1;
quirk->data.address_match = 0x88000;
quirk->data.address_mask = PCIE_CONFIG_SPACE_SIZE - 1;
quirk->data.bar = nr;
memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_nvidia_88000_quirk,
quirk, "vfio-nvidia-bar0-88000-quirk",
TARGET_PAGE_ALIGN(quirk->data.address_mask + 1));
memory_region_add_subregion_overlap(&vdev->bars[nr].mem,
quirk->data.address_match & TARGET_PAGE_MASK,
&quirk->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
DPRINTF("Enabled NVIDIA BAR0 0x88000 quirk for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
/*
* And here's the same for BAR0 offset 0x1800...
*/
static void vfio_probe_nvidia_bar0_1800_quirk(VFIODevice *vdev, int nr)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (!vdev->has_vga || nr != 0 ||
pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_NVIDIA) {
return;
}
/* Log the chipset ID */
DPRINTF("Nvidia NV%02x\n",
(unsigned int)(vfio_bar_read(&vdev->bars[0], 0, 4) >> 20) & 0xff);
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.flags = quirk->data.read_flags = quirk->data.write_flags = 1;
quirk->data.address_match = 0x1800;
quirk->data.address_mask = PCI_CONFIG_SPACE_SIZE - 1;
quirk->data.bar = nr;
memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_generic_quirk, quirk,
"vfio-nvidia-bar0-1800-quirk",
TARGET_PAGE_ALIGN(quirk->data.address_mask + 1));
memory_region_add_subregion_overlap(&vdev->bars[nr].mem,
quirk->data.address_match & TARGET_PAGE_MASK,
&quirk->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
DPRINTF("Enabled NVIDIA BAR0 0x1800 quirk for device %04x:%02x:%02x.%x\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
/*
* TODO - Some Nvidia devices provide config access to their companion HDA
* device and even to their parent bridge via these config space mirrors.
* Add quirks for those regions.
*/
/*
* Common quirk probe entry points.
*/
static void vfio_vga_quirk_setup(VFIODevice *vdev)
{
vfio_vga_probe_ati_3c3_quirk(vdev);
vfio_vga_probe_nvidia_3d0_quirk(vdev);
}
static void vfio_vga_quirk_teardown(VFIODevice *vdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(vdev->vga.region); i++) {
while (!QLIST_EMPTY(&vdev->vga.region[i].quirks)) {
VFIOQuirk *quirk = QLIST_FIRST(&vdev->vga.region[i].quirks);
memory_region_del_subregion(&vdev->vga.region[i].mem, &quirk->mem);
memory_region_destroy(&quirk->mem);
QLIST_REMOVE(quirk, next);
g_free(quirk);
}
}
}
static void vfio_bar_quirk_setup(VFIODevice *vdev, int nr)
{
vfio_probe_ati_bar4_window_quirk(vdev, nr);
vfio_probe_ati_bar2_4000_quirk(vdev, nr);
vfio_probe_nvidia_bar5_window_quirk(vdev, nr);
vfio_probe_nvidia_bar0_88000_quirk(vdev, nr);
vfio_probe_nvidia_bar0_1800_quirk(vdev, nr);
}
static void vfio_bar_quirk_teardown(VFIODevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
while (!QLIST_EMPTY(&bar->quirks)) {
VFIOQuirk *quirk = QLIST_FIRST(&bar->quirks);
memory_region_del_subregion(&bar->mem, &quirk->mem);
memory_region_destroy(&quirk->mem);
QLIST_REMOVE(quirk, next);
g_free(quirk);
}
}
/*
* PCI config space
*/
static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len)
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
uint32_t emu_bits = 0, emu_val = 0, phys_val = 0, val;
memcpy(&emu_bits, vdev->emulated_config_bits + addr, len);
emu_bits = le32_to_cpu(emu_bits);
if (emu_bits) {
emu_val = pci_default_read_config(pdev, addr, len);
}
if (~emu_bits & (0xffffffffU >> (32 - len * 8))) {
ssize_t ret;
ret = pread(vdev->fd, &phys_val, len, vdev->config_offset + addr);
if (ret != len) {
error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x) failed: %m",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function, addr, len);
return -errno;
}
phys_val = le32_to_cpu(phys_val);
}
val = (emu_val & emu_bits) | (phys_val & ~emu_bits);
DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, len=0x%x) %x\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, addr, len, val);
return val;
}
static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
uint32_t val, int len)
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
uint32_t val_le = cpu_to_le32(val);
DPRINTF("%s(%04x:%02x:%02x.%x, @0x%x, 0x%x, len=0x%x)\n", __func__,
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, addr, val, len);
/* Write everything to VFIO, let it filter out what we can't write */
if (pwrite(vdev->fd, &val_le, len, vdev->config_offset + addr) != len) {
error_report("%s(%04x:%02x:%02x.%x, 0x%x, 0x%x, 0x%x) failed: %m",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function, addr, val, len);
}
/* MSI/MSI-X Enabling/Disabling */
if (pdev->cap_present & QEMU_PCI_CAP_MSI &&
ranges_overlap(addr, len, pdev->msi_cap, vdev->msi_cap_size)) {
int is_enabled, was_enabled = msi_enabled(pdev);
pci_default_write_config(pdev, addr, val, len);
is_enabled = msi_enabled(pdev);
if (!was_enabled) {
if (is_enabled) {
vfio_enable_msi(vdev);
}
} else {
if (!is_enabled) {
vfio_disable_msi(vdev);
} else {
vfio_update_msi(vdev);
}
}
} else if (pdev->cap_present & QEMU_PCI_CAP_MSIX &&
ranges_overlap(addr, len, pdev->msix_cap, MSIX_CAP_LENGTH)) {
int is_enabled, was_enabled = msix_enabled(pdev);
pci_default_write_config(pdev, addr, val, len);
is_enabled = msix_enabled(pdev);
if (!was_enabled && is_enabled) {
vfio_enable_msix(vdev);
} else if (was_enabled && !is_enabled) {
vfio_disable_msix(vdev);
}
} else {
/* Write everything to QEMU to keep emulated bits correct */
pci_default_write_config(pdev, addr, val, len);
}
}
/*
* DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
*/
static int vfio_dma_unmap(VFIOContainer *container,
hwaddr iova, ram_addr_t size)
{
struct vfio_iommu_type1_dma_unmap unmap = {
.argsz = sizeof(unmap),
.flags = 0,
.iova = iova,
.size = size,
};
if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
DPRINTF("VFIO_UNMAP_DMA: %d\n", -errno);
return -errno;
}
return 0;
}
static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
ram_addr_t size, void *vaddr, bool readonly)
{
struct vfio_iommu_type1_dma_map map = {
.argsz = sizeof(map),
.flags = VFIO_DMA_MAP_FLAG_READ,
.vaddr = (__u64)(uintptr_t)vaddr,
.iova = iova,
.size = size,
};
if (!readonly) {
map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
}
/*
* Try the mapping, if it fails with EBUSY, unmap the region and try
* again. This shouldn't be necessary, but we sometimes see it in
* the the VGA ROM space.
*/
if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
(errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
return 0;
}
DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
return -errno;
}
static bool vfio_listener_skipped_section(MemoryRegionSection *section)
{
return !memory_region_is_ram(section->mr) ||
/*
* Sizing an enabled 64-bit BAR can cause spurious mappings to
* addresses in the upper part of the 64-bit address space. These
* are never accessed by the CPU and beyond the address width of
* some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
*/
section->offset_within_address_space & (1ULL << 63);
}
static void vfio_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
VFIOContainer *container = container_of(listener, VFIOContainer,
iommu_data.type1.listener);
hwaddr iova, end;
void *vaddr;
int ret;
assert(!memory_region_is_iommu(section->mr));
if (vfio_listener_skipped_section(section)) {
DPRINTF("SKIPPING region_add %"HWADDR_PRIx" - %"PRIx64"\n",
section->offset_within_address_space,
section->offset_within_address_space +
int128_get64(int128_sub(section->size, int128_one())));
return;
}
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
error_report("%s received unaligned region", __func__);
return;
}
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
end = (section->offset_within_address_space + int128_get64(section->size)) &
TARGET_PAGE_MASK;
if (iova >= end) {
return;
}
vaddr = memory_region_get_ram_ptr(section->mr) +
section->offset_within_region +
(iova - section->offset_within_address_space);
DPRINTF("region_add %"HWADDR_PRIx" - %"HWADDR_PRIx" [%p]\n",
iova, end - 1, vaddr);
memory_region_ref(section->mr);
ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly);
if (ret) {
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx", %p) = %d (%m)",
container, iova, end - iova, vaddr, ret);
/*
* On the initfn path, store the first error in the container so we
* can gracefully fail. Runtime, there's not much we can do other
* than throw a hardware error.
*/
if (!container->iommu_data.type1.initialized) {
if (!container->iommu_data.type1.error) {
container->iommu_data.type1.error = ret;
}
} else {
hw_error("vfio: DMA mapping failed, unable to continue\n");
}
}
}
static void vfio_listener_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
VFIOContainer *container = container_of(listener, VFIOContainer,
iommu_data.type1.listener);
hwaddr iova, end;
int ret;
if (vfio_listener_skipped_section(section)) {
DPRINTF("SKIPPING region_del %"HWADDR_PRIx" - %"PRIx64"\n",
section->offset_within_address_space,
section->offset_within_address_space +
int128_get64(int128_sub(section->size, int128_one())));
return;
}
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
error_report("%s received unaligned region", __func__);
return;
}
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
end = (section->offset_within_address_space + int128_get64(section->size)) &
TARGET_PAGE_MASK;
if (iova >= end) {
return;
}
DPRINTF("region_del %"HWADDR_PRIx" - %"HWADDR_PRIx"\n",
iova, end - 1);
ret = vfio_dma_unmap(container, iova, end - iova);
memory_region_unref(section->mr);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") = %d (%m)",
container, iova, end - iova, ret);
}
}
static MemoryListener vfio_memory_listener = {
.region_add = vfio_listener_region_add,
.region_del = vfio_listener_region_del,
};
static void vfio_listener_release(VFIOContainer *container)
{
memory_listener_unregister(&container->iommu_data.type1.listener);
}
/*
* Interrupt setup
*/
static void vfio_disable_interrupts(VFIODevice *vdev)
{
switch (vdev->interrupt) {
case VFIO_INT_INTx:
vfio_disable_intx(vdev);
break;
case VFIO_INT_MSI:
vfio_disable_msi(vdev);
break;
case VFIO_INT_MSIX:
vfio_disable_msix(vdev);
break;
}
}
static int vfio_setup_msi(VFIODevice *vdev, int pos)
{
uint16_t ctrl;
bool msi_64bit, msi_maskbit;
int ret, entries;
if (pread(vdev->fd, &ctrl, sizeof(ctrl),
vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
return -errno;
}
ctrl = le16_to_cpu(ctrl);
msi_64bit = !!(ctrl & PCI_MSI_FLAGS_64BIT);
msi_maskbit = !!(ctrl & PCI_MSI_FLAGS_MASKBIT);
entries = 1 << ((ctrl & PCI_MSI_FLAGS_QMASK) >> 1);
DPRINTF("%04x:%02x:%02x.%x PCI MSI CAP @0x%x\n", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function, pos);
ret = msi_init(&vdev->pdev, pos, entries, msi_64bit, msi_maskbit);
if (ret < 0) {
if (ret == -ENOTSUP) {
return 0;
}
error_report("vfio: msi_init failed");
return ret;
}
vdev->msi_cap_size = 0xa + (msi_maskbit ? 0xa : 0) + (msi_64bit ? 0x4 : 0);
return 0;
}
/*
* We don't have any control over how pci_add_capability() inserts
* capabilities into the chain. In order to setup MSI-X we need a
* MemoryRegion for the BAR. In order to setup the BAR and not
* attempt to mmap the MSI-X table area, which VFIO won't allow, we
* need to first look for where the MSI-X table lives. So we
* unfortunately split MSI-X setup across two functions.
*/
static int vfio_early_setup_msix(VFIODevice *vdev)
{
uint8_t pos;
uint16_t ctrl;
uint32_t table, pba;
pos = pci_find_capability(&vdev->pdev, PCI_CAP_ID_MSIX);
if (!pos) {
return 0;
}
if (pread(vdev->fd, &ctrl, sizeof(ctrl),
vdev->config_offset + pos + PCI_CAP_FLAGS) != sizeof(ctrl)) {
return -errno;
}
if (pread(vdev->fd, &table, sizeof(table),
vdev->config_offset + pos + PCI_MSIX_TABLE) != sizeof(table)) {
return -errno;
}
if (pread(vdev->fd, &pba, sizeof(pba),
vdev->config_offset + pos + PCI_MSIX_PBA) != sizeof(pba)) {
return -errno;
}
ctrl = le16_to_cpu(ctrl);
table = le32_to_cpu(table);
pba = le32_to_cpu(pba);
vdev->msix = g_malloc0(sizeof(*(vdev->msix)));
vdev->msix->table_bar = table & PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->table_offset = table & ~PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->pba_bar = pba & PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->pba_offset = pba & ~PCI_MSIX_FLAGS_BIRMASK;
vdev->msix->entries = (ctrl & PCI_MSIX_FLAGS_QSIZE) + 1;
DPRINTF("%04x:%02x:%02x.%x "
"PCI MSI-X CAP @0x%x, BAR %d, offset 0x%x, entries %d\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, pos, vdev->msix->table_bar,
vdev->msix->table_offset, vdev->msix->entries);
return 0;
}
static int vfio_setup_msix(VFIODevice *vdev, int pos)
{
int ret;
ret = msix_init(&vdev->pdev, vdev->msix->entries,
&vdev->bars[vdev->msix->table_bar].mem,
vdev->msix->table_bar, vdev->msix->table_offset,
&vdev->bars[vdev->msix->pba_bar].mem,
vdev->msix->pba_bar, vdev->msix->pba_offset, pos);
if (ret < 0) {
if (ret == -ENOTSUP) {
return 0;
}
error_report("vfio: msix_init failed");
return ret;
}
return 0;
}
static void vfio_teardown_msi(VFIODevice *vdev)
{
msi_uninit(&vdev->pdev);
if (vdev->msix) {
msix_uninit(&vdev->pdev, &vdev->bars[vdev->msix->table_bar].mem,
&vdev->bars[vdev->msix->pba_bar].mem);
}
}
/*
* Resource setup
*/
static void vfio_mmap_set_enabled(VFIODevice *vdev, bool enabled)
{
int i;
for (i = 0; i < PCI_ROM_SLOT; i++) {
VFIOBAR *bar = &vdev->bars[i];
if (!bar->size) {
continue;
}
memory_region_set_enabled(&bar->mmap_mem, enabled);
if (vdev->msix && vdev->msix->table_bar == i) {
memory_region_set_enabled(&vdev->msix->mmap_mem, enabled);
}
}
}
static void vfio_unmap_bar(VFIODevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
if (!bar->size) {
return;
}
vfio_bar_quirk_teardown(vdev, nr);
memory_region_del_subregion(&bar->mem, &bar->mmap_mem);
munmap(bar->mmap, memory_region_size(&bar->mmap_mem));
memory_region_destroy(&bar->mmap_mem);
if (vdev->msix && vdev->msix->table_bar == nr) {
memory_region_del_subregion(&bar->mem, &vdev->msix->mmap_mem);
munmap(vdev->msix->mmap, memory_region_size(&vdev->msix->mmap_mem));
memory_region_destroy(&vdev->msix->mmap_mem);
}
memory_region_destroy(&bar->mem);
}
static int vfio_mmap_bar(VFIODevice *vdev, VFIOBAR *bar,
MemoryRegion *mem, MemoryRegion *submem,
void **map, size_t size, off_t offset,
const char *name)
{
int ret = 0;
if (VFIO_ALLOW_MMAP && size && bar->flags & VFIO_REGION_INFO_FLAG_MMAP) {
int prot = 0;
if (bar->flags & VFIO_REGION_INFO_FLAG_READ) {
prot |= PROT_READ;
}
if (bar->flags & VFIO_REGION_INFO_FLAG_WRITE) {
prot |= PROT_WRITE;
}
*map = mmap(NULL, size, prot, MAP_SHARED,
bar->fd, bar->fd_offset + offset);
if (*map == MAP_FAILED) {
*map = NULL;
ret = -errno;
goto empty_region;
}
memory_region_init_ram_ptr(submem, OBJECT(vdev), name, size, *map);
} else {
empty_region:
/* Create a zero sized sub-region to make cleanup easy. */
memory_region_init(submem, OBJECT(vdev), name, 0);
}
memory_region_add_subregion(mem, offset, submem);
return ret;
}
static void vfio_map_bar(VFIODevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
unsigned size = bar->size;
char name[64];
uint32_t pci_bar;
uint8_t type;
int ret;
/* Skip both unimplemented BARs and the upper half of 64bit BARS. */
if (!size) {
return;
}
snprintf(name, sizeof(name), "VFIO %04x:%02x:%02x.%x BAR %d",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, nr);
/* Determine what type of BAR this is for registration */
ret = pread(vdev->fd, &pci_bar, sizeof(pci_bar),
vdev->config_offset + PCI_BASE_ADDRESS_0 + (4 * nr));
if (ret != sizeof(pci_bar)) {
error_report("vfio: Failed to read BAR %d (%m)", nr);
return;
}
pci_bar = le32_to_cpu(pci_bar);
bar->ioport = (pci_bar & PCI_BASE_ADDRESS_SPACE_IO);
bar->mem64 = bar->ioport ? 0 : (pci_bar & PCI_BASE_ADDRESS_MEM_TYPE_64);
type = pci_bar & (bar->ioport ? ~PCI_BASE_ADDRESS_IO_MASK :
~PCI_BASE_ADDRESS_MEM_MASK);
/* A "slow" read/write mapping underlies all BARs */
memory_region_init_io(&bar->mem, OBJECT(vdev), &vfio_bar_ops,
bar, name, size);
pci_register_bar(&vdev->pdev, nr, type, &bar->mem);
/*
* We can't mmap areas overlapping the MSIX vector table, so we
* potentially insert a direct-mapped subregion before and after it.
*/
if (vdev->msix && vdev->msix->table_bar == nr) {
size = vdev->msix->table_offset & qemu_host_page_mask;
}
strncat(name, " mmap", sizeof(name) - strlen(name) - 1);
if (vfio_mmap_bar(vdev, bar, &bar->mem,
&bar->mmap_mem, &bar->mmap, size, 0, name)) {
error_report("%s unsupported. Performance may be slow", name);
}
if (vdev->msix && vdev->msix->table_bar == nr) {
unsigned start;
start = HOST_PAGE_ALIGN(vdev->msix->table_offset +
(vdev->msix->entries * PCI_MSIX_ENTRY_SIZE));
size = start < bar->size ? bar->size - start : 0;
strncat(name, " msix-hi", sizeof(name) - strlen(name) - 1);
/* VFIOMSIXInfo contains another MemoryRegion for this mapping */
if (vfio_mmap_bar(vdev, bar, &bar->mem, &vdev->msix->mmap_mem,
&vdev->msix->mmap, size, start, name)) {
error_report("%s unsupported. Performance may be slow", name);
}
}
vfio_bar_quirk_setup(vdev, nr);
}
static void vfio_map_bars(VFIODevice *vdev)
{
int i;
for (i = 0; i < PCI_ROM_SLOT; i++) {
vfio_map_bar(vdev, i);
}
if (vdev->has_vga) {
memory_region_init_io(&vdev->vga.region[QEMU_PCI_VGA_MEM].mem,
OBJECT(vdev), &vfio_vga_ops,
&vdev->vga.region[QEMU_PCI_VGA_MEM],
"vfio-vga-mmio@0xa0000",
QEMU_PCI_VGA_MEM_SIZE);
memory_region_init_io(&vdev->vga.region[QEMU_PCI_VGA_IO_LO].mem,
OBJECT(vdev), &vfio_vga_ops,
&vdev->vga.region[QEMU_PCI_VGA_IO_LO],
"vfio-vga-io@0x3b0",
QEMU_PCI_VGA_IO_LO_SIZE);
memory_region_init_io(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem,
OBJECT(vdev), &vfio_vga_ops,
&vdev->vga.region[QEMU_PCI_VGA_IO_HI],
"vfio-vga-io@0x3c0",
QEMU_PCI_VGA_IO_HI_SIZE);
pci_register_vga(&vdev->pdev, &vdev->vga.region[QEMU_PCI_VGA_MEM].mem,
&vdev->vga.region[QEMU_PCI_VGA_IO_LO].mem,
&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem);
vfio_vga_quirk_setup(vdev);
}
}
static void vfio_unmap_bars(VFIODevice *vdev)
{
int i;
for (i = 0; i < PCI_ROM_SLOT; i++) {
vfio_unmap_bar(vdev, i);
}
if (vdev->has_vga) {
vfio_vga_quirk_teardown(vdev);
pci_unregister_vga(&vdev->pdev);
memory_region_destroy(&vdev->vga.region[QEMU_PCI_VGA_MEM].mem);
memory_region_destroy(&vdev->vga.region[QEMU_PCI_VGA_IO_LO].mem);
memory_region_destroy(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].mem);
}
}
/*
* General setup
*/
static uint8_t vfio_std_cap_max_size(PCIDevice *pdev, uint8_t pos)
{
uint8_t tmp, next = 0xff;
for (tmp = pdev->config[PCI_CAPABILITY_LIST]; tmp;
tmp = pdev->config[tmp + 1]) {
if (tmp > pos && tmp < next) {
next = tmp;
}
}
return next - pos;
}
static void vfio_set_word_bits(uint8_t *buf, uint16_t val, uint16_t mask)
{
pci_set_word(buf, (pci_get_word(buf) & ~mask) | val);
}
static void vfio_add_emulated_word(VFIODevice *vdev, int pos,
uint16_t val, uint16_t mask)
{
vfio_set_word_bits(vdev->pdev.config + pos, val, mask);
vfio_set_word_bits(vdev->pdev.wmask + pos, ~mask, mask);
vfio_set_word_bits(vdev->emulated_config_bits + pos, mask, mask);
}
static void vfio_set_long_bits(uint8_t *buf, uint32_t val, uint32_t mask)
{
pci_set_long(buf, (pci_get_long(buf) & ~mask) | val);
}
static void vfio_add_emulated_long(VFIODevice *vdev, int pos,
uint32_t val, uint32_t mask)
{
vfio_set_long_bits(vdev->pdev.config + pos, val, mask);
vfio_set_long_bits(vdev->pdev.wmask + pos, ~mask, mask);
vfio_set_long_bits(vdev->emulated_config_bits + pos, mask, mask);
}
static int vfio_setup_pcie_cap(VFIODevice *vdev, int pos, uint8_t size)
{
uint16_t flags;
uint8_t type;
flags = pci_get_word(vdev->pdev.config + pos + PCI_CAP_FLAGS);
type = (flags & PCI_EXP_FLAGS_TYPE) >> 4;
if (type != PCI_EXP_TYPE_ENDPOINT &&
type != PCI_EXP_TYPE_LEG_END &&
type != PCI_EXP_TYPE_RC_END) {
error_report("vfio: Assignment of PCIe type 0x%x "
"devices is not currently supported", type);
return -EINVAL;
}
if (!pci_bus_is_express(vdev->pdev.bus)) {
/*
* Use express capability as-is on PCI bus. It doesn't make much
* sense to even expose, but some drivers (ex. tg3) depend on it
* and guests don't seem to be particular about it. We'll need
* to revist this or force express devices to express buses if we
* ever expose an IOMMU to the guest.
*/
} else if (pci_bus_is_root(vdev->pdev.bus)) {
/*
* On a Root Complex bus Endpoints become Root Complex Integrated
* Endpoints, which changes the type and clears the LNK & LNK2 fields.
*/
if (type == PCI_EXP_TYPE_ENDPOINT) {
vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS,
PCI_EXP_TYPE_RC_END << 4,
PCI_EXP_FLAGS_TYPE);
/* Link Capabilities, Status, and Control goes away */
if (size > PCI_EXP_LNKCTL) {
vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP, 0, ~0);
vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0);
vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA, 0, ~0);
#ifndef PCI_EXP_LNKCAP2
#define PCI_EXP_LNKCAP2 44
#endif
#ifndef PCI_EXP_LNKSTA2
#define PCI_EXP_LNKSTA2 50
#endif
/* Link 2 Capabilities, Status, and Control goes away */
if (size > PCI_EXP_LNKCAP2) {
vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP2, 0, ~0);
vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL2, 0, ~0);
vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA2, 0, ~0);
}
}
} else if (type == PCI_EXP_TYPE_LEG_END) {
/*
* Legacy endpoints don't belong on the root complex. Windows
* seems to be happier with devices if we skip the capability.
*/
return 0;
}
} else {
/*
* Convert Root Complex Integrated Endpoints to regular endpoints.
* These devices don't support LNK/LNK2 capabilities, so make them up.
*/
if (type == PCI_EXP_TYPE_RC_END) {
vfio_add_emulated_word(vdev, pos + PCI_CAP_FLAGS,
PCI_EXP_TYPE_ENDPOINT << 4,
PCI_EXP_FLAGS_TYPE);
vfio_add_emulated_long(vdev, pos + PCI_EXP_LNKCAP,
PCI_EXP_LNK_MLW_1 | PCI_EXP_LNK_LS_25, ~0);
vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKCTL, 0, ~0);
}
/* Mark the Link Status bits as emulated to allow virtual negotiation */
vfio_add_emulated_word(vdev, pos + PCI_EXP_LNKSTA,
pci_get_word(vdev->pdev.config + pos +
PCI_EXP_LNKSTA),
PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS);
}
pos = pci_add_capability(&vdev->pdev, PCI_CAP_ID_EXP, pos, size);
if (pos >= 0) {
vdev->pdev.exp.exp_cap = pos;
}
return pos;
}
static void vfio_check_pcie_flr(VFIODevice *vdev, uint8_t pos)
{
uint32_t cap = pci_get_long(vdev->pdev.config + pos + PCI_EXP_DEVCAP);
if (cap & PCI_EXP_DEVCAP_FLR) {
DPRINTF("%04x:%02x:%02x.%x Supports FLR via PCIe cap\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
vdev->has_flr = true;
}
}
static void vfio_check_pm_reset(VFIODevice *vdev, uint8_t pos)
{
uint16_t csr = pci_get_word(vdev->pdev.config + pos + PCI_PM_CTRL);
if (!(csr & PCI_PM_CTRL_NO_SOFT_RESET)) {
DPRINTF("%04x:%02x:%02x.%x Supports PM reset\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
vdev->has_pm_reset = true;
}
}
static void vfio_check_af_flr(VFIODevice *vdev, uint8_t pos)
{
uint8_t cap = pci_get_byte(vdev->pdev.config + pos + PCI_AF_CAP);
if ((cap & PCI_AF_CAP_TP) && (cap & PCI_AF_CAP_FLR)) {
DPRINTF("%04x:%02x:%02x.%x Supports FLR via AF cap\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
vdev->has_flr = true;
}
}
static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos)
{
PCIDevice *pdev = &vdev->pdev;
uint8_t cap_id, next, size;
int ret;
cap_id = pdev->config[pos];
next = pdev->config[pos + 1];
/*
* If it becomes important to configure capabilities to their actual
* size, use this as the default when it's something we don't recognize.
* Since QEMU doesn't actually handle many of the config accesses,
* exact size doesn't seem worthwhile.
*/
size = vfio_std_cap_max_size(pdev, pos);
/*
* pci_add_capability always inserts the new capability at the head
* of the chain. Therefore to end up with a chain that matches the
* physical device, we insert from the end by making this recursive.
* This is also why we pre-caclulate size above as cached config space
* will be changed as we unwind the stack.
*/
if (next) {
ret = vfio_add_std_cap(vdev, next);
if (ret) {
return ret;
}
} else {
/* Begin the rebuild, use QEMU emulated list bits */
pdev->config[PCI_CAPABILITY_LIST] = 0;
vdev->emulated_config_bits[PCI_CAPABILITY_LIST] = 0xff;
vdev->emulated_config_bits[PCI_STATUS] |= PCI_STATUS_CAP_LIST;
}
/* Use emulated next pointer to allow dropping caps */
pci_set_byte(vdev->emulated_config_bits + pos + 1, 0xff);
switch (cap_id) {
case PCI_CAP_ID_MSI:
ret = vfio_setup_msi(vdev, pos);
break;
case PCI_CAP_ID_EXP:
vfio_check_pcie_flr(vdev, pos);
ret = vfio_setup_pcie_cap(vdev, pos, size);
break;
case PCI_CAP_ID_MSIX:
ret = vfio_setup_msix(vdev, pos);
break;
case PCI_CAP_ID_PM:
vfio_check_pm_reset(vdev, pos);
vdev->pm_cap = pos;
ret = pci_add_capability(pdev, cap_id, pos, size);
break;
case PCI_CAP_ID_AF:
vfio_check_af_flr(vdev, pos);
ret = pci_add_capability(pdev, cap_id, pos, size);
break;
default:
ret = pci_add_capability(pdev, cap_id, pos, size);
break;
}
if (ret < 0) {
error_report("vfio: %04x:%02x:%02x.%x Error adding PCI capability "
"0x%x[0x%x]@0x%x: %d", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
cap_id, size, pos, ret);
return ret;
}
return 0;
}
static int vfio_add_capabilities(VFIODevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
if (!(pdev->config[PCI_STATUS] & PCI_STATUS_CAP_LIST) ||
!pdev->config[PCI_CAPABILITY_LIST]) {
return 0; /* Nothing to add */
}
return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
}
static void vfio_pci_pre_reset(VFIODevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
uint16_t cmd;
vfio_disable_interrupts(vdev);
/* Make sure the device is in D0 */
if (vdev->pm_cap) {
uint16_t pmcsr;
uint8_t state;
pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
state = pmcsr & PCI_PM_CTRL_STATE_MASK;
if (state) {
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
vfio_pci_write_config(pdev, vdev->pm_cap + PCI_PM_CTRL, pmcsr, 2);
/* vfio handles the necessary delay here */
pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
state = pmcsr & PCI_PM_CTRL_STATE_MASK;
if (state) {
error_report("vfio: Unable to power on device, stuck in D%d\n",
state);
}
}
}
/*
* Stop any ongoing DMA by disconecting I/O, MMIO, and bus master.
* Also put INTx Disable in known state.
*/
cmd = vfio_pci_read_config(pdev, PCI_COMMAND, 2);
cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
PCI_COMMAND_INTX_DISABLE);
vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2);
}
static void vfio_pci_post_reset(VFIODevice *vdev)
{
vfio_enable_intx(vdev);
}
static bool vfio_pci_host_match(PCIHostDeviceAddress *host1,
PCIHostDeviceAddress *host2)
{
return (host1->domain == host2->domain && host1->bus == host2->bus &&
host1->slot == host2->slot && host1->function == host2->function);
}
static int vfio_pci_hot_reset(VFIODevice *vdev, bool single)
{
VFIOGroup *group;
struct vfio_pci_hot_reset_info *info;
struct vfio_pci_dependent_device *devices;
struct vfio_pci_hot_reset *reset;
int32_t *fds;
int ret, i, count;
bool multi = false;
DPRINTF("%s(%04x:%02x:%02x.%x) %s\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
single ? "one" : "multi");
vfio_pci_pre_reset(vdev);
vdev->needs_reset = false;
info = g_malloc0(sizeof(*info));
info->argsz = sizeof(*info);
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info);
if (ret && errno != ENOSPC) {
ret = -errno;
if (!vdev->has_pm_reset) {
error_report("vfio: Cannot reset device %04x:%02x:%02x.%x, "
"no available reset mechanism.", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
}
goto out_single;
}
count = info->count;
info = g_realloc(info, sizeof(*info) + (count * sizeof(*devices)));
info->argsz = sizeof(*info) + (count * sizeof(*devices));
devices = &info->devices[0];
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info);
if (ret) {
ret = -errno;
error_report("vfio: hot reset info failed: %m");
goto out_single;
}
DPRINTF("%04x:%02x:%02x.%x: hot reset dependent devices:\n",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
/* Verify that we have all the groups required */
for (i = 0; i < info->count; i++) {
PCIHostDeviceAddress host;
VFIODevice *tmp;
host.domain = devices[i].segment;
host.bus = devices[i].bus;
host.slot = PCI_SLOT(devices[i].devfn);
host.function = PCI_FUNC(devices[i].devfn);
DPRINTF("\t%04x:%02x:%02x.%x group %d\n", host.domain,
host.bus, host.slot, host.function, devices[i].group_id);
if (vfio_pci_host_match(&host, &vdev->host)) {
continue;
}
QLIST_FOREACH(group, &group_list, next) {
if (group->groupid == devices[i].group_id) {
break;
}
}
if (!group) {
if (!vdev->has_pm_reset) {
error_report("vfio: Cannot reset device %04x:%02x:%02x.%x, "
"depends on group %d which is not owned.",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function, devices[i].group_id);
}
ret = -EPERM;
goto out;
}
/* Prep dependent devices for reset and clear our marker. */
QLIST_FOREACH(tmp, &group->device_list, next) {
if (vfio_pci_host_match(&host, &tmp->host)) {
if (single) {
DPRINTF("vfio: found another in-use device "
"%04x:%02x:%02x.%x\n", host.domain, host.bus,
host.slot, host.function);
ret = -EINVAL;
goto out_single;
}
vfio_pci_pre_reset(tmp);
tmp->needs_reset = false;
multi = true;
break;
}
}
}
if (!single && !multi) {
DPRINTF("vfio: No other in-use devices for multi hot reset\n");
ret = -EINVAL;
goto out_single;
}
/* Determine how many group fds need to be passed */
count = 0;
QLIST_FOREACH(group, &group_list, next) {
for (i = 0; i < info->count; i++) {
if (group->groupid == devices[i].group_id) {
count++;
break;
}
}
}
reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds)));
reset->argsz = sizeof(*reset) + (count * sizeof(*fds));
fds = &reset->group_fds[0];
/* Fill in group fds */
QLIST_FOREACH(group, &group_list, next) {
for (i = 0; i < info->count; i++) {
if (group->groupid == devices[i].group_id) {
fds[reset->count++] = group->fd;
break;
}
}
}
/* Bus reset! */
ret = ioctl(vdev->fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
g_free(reset);
DPRINTF("%04x:%02x:%02x.%x hot reset: %s\n", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function,
ret ? "%m" : "Success");
out:
/* Re-enable INTx on affected devices */
for (i = 0; i < info->count; i++) {
PCIHostDeviceAddress host;
VFIODevice *tmp;
host.domain = devices[i].segment;
host.bus = devices[i].bus;
host.slot = PCI_SLOT(devices[i].devfn);
host.function = PCI_FUNC(devices[i].devfn);
if (vfio_pci_host_match(&host, &vdev->host)) {
continue;
}
QLIST_FOREACH(group, &group_list, next) {
if (group->groupid == devices[i].group_id) {
break;
}
}
if (!group) {
break;
}
QLIST_FOREACH(tmp, &group->device_list, next) {
if (vfio_pci_host_match(&host, &tmp->host)) {
vfio_pci_post_reset(tmp);
break;
}
}
}
out_single:
vfio_pci_post_reset(vdev);
g_free(info);
return ret;
}
/*
* We want to differentiate hot reset of mulitple in-use devices vs hot reset
* of a single in-use device. VFIO_DEVICE_RESET will already handle the case
* of doing hot resets when there is only a single device per bus. The in-use
* here refers to how many VFIODevices are affected. A hot reset that affects
* multiple devices, but only a single in-use device, means that we can call
* it from our bus ->reset() callback since the extent is effectively a single
* device. This allows us to make use of it in the hotplug path. When there
* are multiple in-use devices, we can only trigger the hot reset during a
* system reset and thus from our reset handler. We separate _one vs _multi
* here so that we don't overlap and do a double reset on the system reset
* path where both our reset handler and ->reset() callback are used. Calling
* _one() will only do a hot reset for the one in-use devices case, calling
* _multi() will do nothing if a _one() would have been sufficient.
*/
static int vfio_pci_hot_reset_one(VFIODevice *vdev)
{
return vfio_pci_hot_reset(vdev, true);
}
static int vfio_pci_hot_reset_multi(VFIODevice *vdev)
{
return vfio_pci_hot_reset(vdev, false);
}
static void vfio_pci_reset_handler(void *opaque)
{
VFIOGroup *group;
VFIODevice *vdev;
QLIST_FOREACH(group, &group_list, next) {
QLIST_FOREACH(vdev, &group->device_list, next) {
if (!vdev->reset_works || (!vdev->has_flr && vdev->has_pm_reset)) {
vdev->needs_reset = true;
}
}
}
QLIST_FOREACH(group, &group_list, next) {
QLIST_FOREACH(vdev, &group->device_list, next) {
if (vdev->needs_reset) {
vfio_pci_hot_reset_multi(vdev);
}
}
}
}
static void vfio_kvm_device_add_group(VFIOGroup *group)
{
#ifdef CONFIG_KVM
struct kvm_device_attr attr = {
.group = KVM_DEV_VFIO_GROUP,
.attr = KVM_DEV_VFIO_GROUP_ADD,
.addr = (uint64_t)(unsigned long)&group->fd,
};
if (!kvm_enabled()) {
return;
}
if (vfio_kvm_device_fd < 0) {
struct kvm_create_device cd = {
.type = KVM_DEV_TYPE_VFIO,
};
if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
DPRINTF("KVM_CREATE_DEVICE: %m\n");
return;
}
vfio_kvm_device_fd = cd.fd;
}
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
error_report("Failed to add group %d to KVM VFIO device: %m",
group->groupid);
}
#endif
}
static void vfio_kvm_device_del_group(VFIOGroup *group)
{
#ifdef CONFIG_KVM
struct kvm_device_attr attr = {
.group = KVM_DEV_VFIO_GROUP,
.attr = KVM_DEV_VFIO_GROUP_DEL,
.addr = (uint64_t)(unsigned long)&group->fd,
};
if (vfio_kvm_device_fd < 0) {
return;
}
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
error_report("Failed to remove group %d to KVM VFIO device: %m",
group->groupid);
}
#endif
}
static int vfio_connect_container(VFIOGroup *group)
{
VFIOContainer *container;
int ret, fd;
if (group->container) {
return 0;
}
QLIST_FOREACH(container, &container_list, next) {
if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
group->container = container;
QLIST_INSERT_HEAD(&container->group_list, group, container_next);
return 0;
}
}
fd = qemu_open("/dev/vfio/vfio", O_RDWR);
if (fd < 0) {
error_report("vfio: failed to open /dev/vfio/vfio: %m");
return -errno;
}
ret = ioctl(fd, VFIO_GET_API_VERSION);
if (ret != VFIO_API_VERSION) {
error_report("vfio: supported vfio version: %d, "
"reported version: %d", VFIO_API_VERSION, ret);
close(fd);
return -EINVAL;
}
container = g_malloc0(sizeof(*container));
container->fd = fd;
if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
if (ret) {
error_report("vfio: failed to set group container: %m");
g_free(container);
close(fd);
return -errno;
}
ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU);
if (ret) {
error_report("vfio: failed to set iommu for container: %m");
g_free(container);
close(fd);
return -errno;
}
container->iommu_data.type1.listener = vfio_memory_listener;
container->iommu_data.release = vfio_listener_release;
memory_listener_register(&container->iommu_data.type1.listener,
&address_space_memory);
if (container->iommu_data.type1.error) {
ret = container->iommu_data.type1.error;
vfio_listener_release(container);
g_free(container);
close(fd);
error_report("vfio: memory listener initialization failed for container\n");
return ret;
}
container->iommu_data.type1.initialized = true;
} else {
error_report("vfio: No available IOMMU models");
g_free(container);
close(fd);
return -EINVAL;
}
QLIST_INIT(&container->group_list);
QLIST_INSERT_HEAD(&container_list, container, next);
group->container = container;
QLIST_INSERT_HEAD(&container->group_list, group, container_next);
return 0;
}
static void vfio_disconnect_container(VFIOGroup *group)
{
VFIOContainer *container = group->container;
if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
error_report("vfio: error disconnecting group %d from container",
group->groupid);
}
QLIST_REMOVE(group, container_next);
group->container = NULL;
if (QLIST_EMPTY(&container->group_list)) {
if (container->iommu_data.release) {
container->iommu_data.release(container);
}
QLIST_REMOVE(container, next);
DPRINTF("vfio_disconnect_container: close container->fd\n");
close(container->fd);
g_free(container);
}
}
static VFIOGroup *vfio_get_group(int groupid)
{
VFIOGroup *group;
char path[32];
struct vfio_group_status status = { .argsz = sizeof(status) };
QLIST_FOREACH(group, &group_list, next) {
if (group->groupid == groupid) {
return group;
}
}
group = g_malloc0(sizeof(*group));
snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
group->fd = qemu_open(path, O_RDWR);
if (group->fd < 0) {
error_report("vfio: error opening %s: %m", path);
g_free(group);
return NULL;
}
if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
error_report("vfio: error getting group status: %m");
close(group->fd);
g_free(group);
return NULL;
}
if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
error_report("vfio: error, group %d is not viable, please ensure "
"all devices within the iommu_group are bound to their "
"vfio bus driver.", groupid);
close(group->fd);
g_free(group);
return NULL;
}
group->groupid = groupid;
QLIST_INIT(&group->device_list);
if (vfio_connect_container(group)) {
error_report("vfio: failed to setup container for group %d", groupid);
close(group->fd);
g_free(group);
return NULL;
}
if (QLIST_EMPTY(&group_list)) {
qemu_register_reset(vfio_pci_reset_handler, NULL);
}
QLIST_INSERT_HEAD(&group_list, group, next);
vfio_kvm_device_add_group(group);
return group;
}
static void vfio_put_group(VFIOGroup *group)
{
if (!QLIST_EMPTY(&group->device_list)) {
return;
}
vfio_kvm_device_del_group(group);
vfio_disconnect_container(group);
QLIST_REMOVE(group, next);
DPRINTF("vfio_put_group: close group->fd\n");
close(group->fd);
g_free(group);
if (QLIST_EMPTY(&group_list)) {
qemu_unregister_reset(vfio_pci_reset_handler, NULL);
}
}
static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
{
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) };
int ret, i;
ret = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
if (ret < 0) {
error_report("vfio: error getting device %s from group %d: %m",
name, group->groupid);
error_printf("Verify all devices in group %d are bound to vfio-pci "
"or pci-stub and not already in use\n", group->groupid);
return ret;
}
vdev->fd = ret;
vdev->group = group;
QLIST_INSERT_HEAD(&group->device_list, vdev, next);
/* Sanity check device */
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_INFO, &dev_info);
if (ret) {
error_report("vfio: error getting device info: %m");
goto error;
}
DPRINTF("Device %s flags: %u, regions: %u, irgs: %u\n", name,
dev_info.flags, dev_info.num_regions, dev_info.num_irqs);
if (!(dev_info.flags & VFIO_DEVICE_FLAGS_PCI)) {
error_report("vfio: Um, this isn't a PCI device");
goto error;
}
vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
if (dev_info.num_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) {
error_report("vfio: unexpected number of io regions %u",
dev_info.num_regions);
goto error;
}
if (dev_info.num_irqs < VFIO_PCI_MSIX_IRQ_INDEX + 1) {
error_report("vfio: unexpected number of irqs %u", dev_info.num_irqs);
goto error;
}
for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
reg_info.index = i;
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
if (ret) {
error_report("vfio: Error getting region %d info: %m", i);
goto error;
}
DPRINTF("Device %s region %d:\n", name, i);
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
(unsigned long)reg_info.size, (unsigned long)reg_info.offset,
(unsigned long)reg_info.flags);
vdev->bars[i].flags = reg_info.flags;
vdev->bars[i].size = reg_info.size;
vdev->bars[i].fd_offset = reg_info.offset;
vdev->bars[i].fd = vdev->fd;
vdev->bars[i].nr = i;
QLIST_INIT(&vdev->bars[i].quirks);
}
reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX;
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
if (ret) {
error_report("vfio: Error getting config info: %m");
goto error;
}
DPRINTF("Device %s config:\n", name);
DPRINTF(" size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
(unsigned long)reg_info.size, (unsigned long)reg_info.offset,
(unsigned long)reg_info.flags);
vdev->config_size = reg_info.size;
if (vdev->config_size == PCI_CONFIG_SPACE_SIZE) {
vdev->pdev.cap_present &= ~QEMU_PCI_CAP_EXPRESS;
}
vdev->config_offset = reg_info.offset;
if ((vdev->features & VFIO_FEATURE_ENABLE_VGA) &&
dev_info.num_regions > VFIO_PCI_VGA_REGION_INDEX) {
struct vfio_region_info vga_info = {
.argsz = sizeof(vga_info),
.index = VFIO_PCI_VGA_REGION_INDEX,
};
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, &vga_info);
if (ret) {
error_report(
"vfio: Device does not support requested feature x-vga");
goto error;
}
if (!(vga_info.flags & VFIO_REGION_INFO_FLAG_READ) ||
!(vga_info.flags & VFIO_REGION_INFO_FLAG_WRITE) ||
vga_info.size < 0xbffff + 1) {
error_report("vfio: Unexpected VGA info, flags 0x%lx, size 0x%lx",
(unsigned long)vga_info.flags,
(unsigned long)vga_info.size);
goto error;
}
vdev->vga.fd_offset = vga_info.offset;
vdev->vga.fd = vdev->fd;
vdev->vga.region[QEMU_PCI_VGA_MEM].offset = QEMU_PCI_VGA_MEM_BASE;
vdev->vga.region[QEMU_PCI_VGA_MEM].nr = QEMU_PCI_VGA_MEM;
QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_MEM].quirks);
vdev->vga.region[QEMU_PCI_VGA_IO_LO].offset = QEMU_PCI_VGA_IO_LO_BASE;
vdev->vga.region[QEMU_PCI_VGA_IO_LO].nr = QEMU_PCI_VGA_IO_LO;
QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_IO_LO].quirks);
vdev->vga.region[QEMU_PCI_VGA_IO_HI].offset = QEMU_PCI_VGA_IO_HI_BASE;
vdev->vga.region[QEMU_PCI_VGA_IO_HI].nr = QEMU_PCI_VGA_IO_HI;
QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_IO_HI].quirks);
vdev->has_vga = true;
}
irq_info.index = VFIO_PCI_ERR_IRQ_INDEX;
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info);
if (ret) {
/* This can fail for an old kernel or legacy PCI dev */
DPRINTF("VFIO_DEVICE_GET_IRQ_INFO failure: %m\n");
ret = 0;
} else if (irq_info.count == 1) {
vdev->pci_aer = true;
} else {
error_report("vfio: %04x:%02x:%02x.%x "
"Could not enable error recovery for the device",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
}
error:
if (ret) {
QLIST_REMOVE(vdev, next);
vdev->group = NULL;
close(vdev->fd);
}
return ret;
}
static void vfio_put_device(VFIODevice *vdev)
{
QLIST_REMOVE(vdev, next);
vdev->group = NULL;
DPRINTF("vfio_put_device: close vdev->fd\n");
close(vdev->fd);
if (vdev->msix) {
g_free(vdev->msix);
vdev->msix = NULL;
}
}
static void vfio_err_notifier_handler(void *opaque)
{
VFIODevice *vdev = opaque;
if (!event_notifier_test_and_clear(&vdev->err_notifier)) {
return;
}
/*
* TBD. Retrieve the error details and decide what action
* needs to be taken. One of the actions could be to pass
* the error to the guest and have the guest driver recover
* from the error. This requires that PCIe capabilities be
* exposed to the guest. For now, we just terminate the
* guest to contain the error.
*/
error_report("%s(%04x:%02x:%02x.%x) Unrecoverable error detected. "
"Please collect any data possible and then kill the guest",
__func__, vdev->host.domain, vdev->host.bus,
vdev->host.slot, vdev->host.function);
vm_stop(RUN_STATE_IO_ERROR);
}
/*
* Registers error notifier for devices supporting error recovery.
* If we encounter a failure in this function, we report an error
* and continue after disabling error recovery support for the
* device.
*/
static void vfio_register_err_notifier(VFIODevice *vdev)
{
int ret;
int argsz;
struct vfio_irq_set *irq_set;
int32_t *pfd;
if (!vdev->pci_aer) {
return;
}
if (event_notifier_init(&vdev->err_notifier, 0)) {
error_report("vfio: Unable to init event notifier for error detection");
vdev->pci_aer = false;
return;
}
argsz = sizeof(*irq_set) + sizeof(*pfd);
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
VFIO_IRQ_SET_ACTION_TRIGGER;
irq_set->index = VFIO_PCI_ERR_IRQ_INDEX;
irq_set->start = 0;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
*pfd = event_notifier_get_fd(&vdev->err_notifier);
qemu_set_fd_handler(*pfd, vfio_err_notifier_handler, NULL, vdev);
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
if (ret) {
error_report("vfio: Failed to set up error notification");
qemu_set_fd_handler(*pfd, NULL, NULL, vdev);
event_notifier_cleanup(&vdev->err_notifier);
vdev->pci_aer = false;
}
g_free(irq_set);
}
static void vfio_unregister_err_notifier(VFIODevice *vdev)
{
int argsz;
struct vfio_irq_set *irq_set;
int32_t *pfd;
int ret;
if (!vdev->pci_aer) {
return;
}
argsz = sizeof(*irq_set) + sizeof(*pfd);
irq_set = g_malloc0(argsz);
irq_set->argsz = argsz;
irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
VFIO_IRQ_SET_ACTION_TRIGGER;
irq_set->index = VFIO_PCI_ERR_IRQ_INDEX;
irq_set->start = 0;
irq_set->count = 1;
pfd = (int32_t *)&irq_set->data;
*pfd = -1;
ret = ioctl(vdev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
if (ret) {
error_report("vfio: Failed to de-assign error fd: %m");
}
g_free(irq_set);
qemu_set_fd_handler(event_notifier_get_fd(&vdev->err_notifier),
NULL, NULL, vdev);
event_notifier_cleanup(&vdev->err_notifier);
}
static int vfio_initfn(PCIDevice *pdev)
{
VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
VFIOGroup *group;
char path[PATH_MAX], iommu_group_path[PATH_MAX], *group_name;
ssize_t len;
struct stat st;
int groupid;
int ret;
/* Check that the host device exists */
snprintf(path, sizeof(path),
"/sys/bus/pci/devices/%04x:%02x:%02x.%01x/",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
if (stat(path, &st) < 0) {
error_report("vfio: error: no such host device: %s", path);
return -errno;
}
strncat(path, "iommu_group", sizeof(path) - strlen(path) - 1);
len = readlink(path, iommu_group_path, PATH_MAX);
if (len <= 0) {
error_report("vfio: error no iommu_group for device");
return -errno;
}
iommu_group_path[len] = 0;
group_name = basename(iommu_group_path);
if (sscanf(group_name, "%d", &groupid) != 1) {
error_report("vfio: error reading %s: %m", path);
return -errno;
}
DPRINTF("%s(%04x:%02x:%02x.%x) group %d\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function, groupid);
group = vfio_get_group(groupid);
if (!group) {
error_report("vfio: failed to get group %d", groupid);
return -ENOENT;
}
snprintf(path, sizeof(path), "%04x:%02x:%02x.%01x",
vdev->host.domain, vdev->host.bus, vdev->host.slot,
vdev->host.function);
QLIST_FOREACH(pvdev, &group->device_list, next) {
if (pvdev->host.domain == vdev->host.domain &&
pvdev->host.bus == vdev->host.bus &&
pvdev->host.slot == vdev->host.slot &&
pvdev->host.function == vdev->host.function) {
error_report("vfio: error: device %s is already attached", path);
vfio_put_group(group);
return -EBUSY;
}
}
ret = vfio_get_device(group, path, vdev);
if (ret) {
error_report("vfio: failed to get device %s", path);
vfio_put_group(group);
return ret;
}
/* Get a copy of config space */
ret = pread(vdev->fd, vdev->pdev.config,
MIN(pci_config_size(&vdev->pdev), vdev->config_size),
vdev->config_offset);
if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) {
ret = ret < 0 ? -errno : -EFAULT;
error_report("vfio: Failed to read device config space");
goto out_put;
}
/* vfio emulates a lot for us, but some bits need extra love */
vdev->emulated_config_bits = g_malloc0(vdev->config_size);
/* QEMU can choose to expose the ROM or not */
memset(vdev->emulated_config_bits + PCI_ROM_ADDRESS, 0xff, 4);
/* QEMU can change multi-function devices to single function, or reverse */
vdev->emulated_config_bits[PCI_HEADER_TYPE] =
PCI_HEADER_TYPE_MULTI_FUNCTION;
/* Restore or clear multifunction, this is always controlled by QEMU */
if (vdev->pdev.cap_present & QEMU_PCI_CAP_MULTIFUNCTION) {
vdev->pdev.config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION;
} else {
vdev->pdev.config[PCI_HEADER_TYPE] &= ~PCI_HEADER_TYPE_MULTI_FUNCTION;
}
/*
* Clear host resource mapping info. If we choose not to register a
* BAR, such as might be the case with the option ROM, we can get
* confusing, unwritable, residual addresses from the host here.
*/
memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24);
memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4);
vfio_pci_size_rom(vdev);
ret = vfio_early_setup_msix(vdev);
if (ret) {
goto out_put;
}
vfio_map_bars(vdev);
ret = vfio_add_capabilities(vdev);
if (ret) {
goto out_teardown;
}
/* QEMU emulates all of MSI & MSIX */
if (pdev->cap_present & QEMU_PCI_CAP_MSIX) {
memset(vdev->emulated_config_bits + pdev->msix_cap, 0xff,
MSIX_CAP_LENGTH);
}
if (pdev->cap_present & QEMU_PCI_CAP_MSI) {
memset(vdev->emulated_config_bits + pdev->msi_cap, 0xff,
vdev->msi_cap_size);
}
if (vfio_pci_read_config(&vdev->pdev, PCI_INTERRUPT_PIN, 1)) {
vdev->intx.mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
vfio_intx_mmap_enable, vdev);
pci_device_set_intx_routing_notifier(&vdev->pdev, vfio_update_irq);
ret = vfio_enable_intx(vdev);
if (ret) {
goto out_teardown;
}
}
add_boot_device_path(vdev->bootindex, &pdev->qdev, NULL);
vfio_register_err_notifier(vdev);
return 0;
out_teardown:
pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
vfio_teardown_msi(vdev);
vfio_unmap_bars(vdev);
out_put:
g_free(vdev->emulated_config_bits);
vfio_put_device(vdev);
vfio_put_group(group);
return ret;
}
static void vfio_exitfn(PCIDevice *pdev)
{
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
VFIOGroup *group = vdev->group;
vfio_unregister_err_notifier(vdev);
pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
vfio_disable_interrupts(vdev);
if (vdev->intx.mmap_timer) {
timer_free(vdev->intx.mmap_timer);
}
vfio_teardown_msi(vdev);
vfio_unmap_bars(vdev);
g_free(vdev->emulated_config_bits);
g_free(vdev->rom);
vfio_put_device(vdev);
vfio_put_group(group);
}
static void vfio_pci_reset(DeviceState *dev)
{
PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
vfio_pci_pre_reset(vdev);
if (vdev->reset_works && (vdev->has_flr || !vdev->has_pm_reset) &&
!ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
DPRINTF("%04x:%02x:%02x.%x FLR/VFIO_DEVICE_RESET\n", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
goto post_reset;
}
/* See if we can do our own bus reset */
if (!vfio_pci_hot_reset_one(vdev)) {
goto post_reset;
}
/* If nothing else works and the device supports PM reset, use it */
if (vdev->reset_works && vdev->has_pm_reset &&
!ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
DPRINTF("%04x:%02x:%02x.%x PCI PM Reset\n", vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
goto post_reset;
}
post_reset:
vfio_pci_post_reset(vdev);
}
static Property vfio_pci_dev_properties[] = {
DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIODevice, host),
DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIODevice,
intx.mmap_timeout, 1100),
DEFINE_PROP_BIT("x-vga", VFIODevice, features,
VFIO_FEATURE_ENABLE_VGA_BIT, false),
DEFINE_PROP_INT32("bootindex", VFIODevice, bootindex, -1),
/*
* TODO - support passed fds... is this necessary?
* DEFINE_PROP_STRING("vfiofd", VFIODevice, vfiofd_name),
* DEFINE_PROP_STRING("vfiogroupfd, VFIODevice, vfiogroupfd_name),
*/
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vfio_pci_vmstate = {
.name = "vfio-pci",
.unmigratable = 1,
};
static void vfio_pci_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
dc->reset = vfio_pci_reset;
dc->props = vfio_pci_dev_properties;
dc->vmsd = &vfio_pci_vmstate;
dc->desc = "VFIO-based PCI device assignment";
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
pdc->init = vfio_initfn;
pdc->exit = vfio_exitfn;
pdc->config_read = vfio_pci_read_config;
pdc->config_write = vfio_pci_write_config;
pdc->is_express = 1; /* We might be */
}
static const TypeInfo vfio_pci_dev_info = {
.name = "vfio-pci",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(VFIODevice),
.class_init = vfio_pci_dev_class_init,
};
static void register_vfio_pci_dev_type(void)
{
type_register_static(&vfio_pci_dev_info);
}
type_init(register_vfio_pci_dev_type)
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