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qemu/hw/vfio/pci-quirks.c
Leonardo Bras 9c7c040702 vfio/nvlink: Remove exec permission to avoid SELinux AVCs 
If SELinux is setup without 'execmem' permission for qemu, all mmap
with (PROT_WRITE | PROT_EXEC) will fail and print a warning in
SELinux log.

If "nvlink2-mr" memory allocation fails (fist diff), it will cause
guest NUMA nodes to not be correctly configured (V100 memory will
not be visible for guest, nor its NUMA nodes).

Not having 'execmem' permission is intesting for virtual machines to
avoid buffer-overflow based attacks, and it's adopted in distros
like RHEL.

So, removing the PROT_EXEC flag seems the right thing to do.

Browsing some other code that mmaps memory for usage with
memory_region_init_ram_device_ptr, I could notice it's usual to
not have PROT_EXEC (only PROT_READ | PROT_WRITE), so it should be
no problem around this.

Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
Message-Id: <20200501055448.286518-1-leobras.c@gmail.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2020-05-27 15:29:36 +10:00

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/*
* device quirks for PCI devices
*
* Copyright Red Hat, Inc. 2012-2015
*
* 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.
*/
#include "qemu/osdep.h"
#include "exec/memop.h"
#include "qemu/units.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/range.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include <sys/ioctl.h>
#include "hw/hw.h"
#include "hw/nvram/fw_cfg.h"
#include "hw/qdev-properties.h"
#include "pci.h"
#include "trace.h"
/*
* List of device ids/vendor ids for which to disable
* option rom loading. This avoids the guest hangs during rom
* execution as noticed with the BCM 57810 card for lack of a
* more better way to handle such issues.
* The user can still override by specifying a romfile or
* rombar=1.
* Please see https://bugs.launchpad.net/qemu/+bug/1284874
* for an analysis of the 57810 card hang. When adding
* a new vendor id/device id combination below, please also add
* your card/environment details and information that could
* help in debugging to the bug tracking this issue
*/
static const struct {
uint32_t vendor;
uint32_t device;
} romblacklist[] = {
{ 0x14e4, 0x168e }, /* Broadcom BCM 57810 */
};
bool vfio_blacklist_opt_rom(VFIOPCIDevice *vdev)
{
int i;
for (i = 0 ; i < ARRAY_SIZE(romblacklist); i++) {
if (vfio_pci_is(vdev, romblacklist[i].vendor, romblacklist[i].device)) {
trace_vfio_quirk_rom_blacklisted(vdev->vbasedev.name,
romblacklist[i].vendor,
romblacklist[i].device);
return true;
}
}
return false;
}
/*
* Device specific region quirks (mostly backdoors to PCI config space)
*/
/*
* The generic window quirks operate on an address and data register,
* vfio_generic_window_address_quirk handles the address register and
* vfio_generic_window_data_quirk handles the data register. These ops
* pass reads and writes through to hardware until a value matching the
* stored address match/mask is written. When this occurs, the data
* register access emulated PCI config space for the device rather than
* passing through accesses. This enables devices where PCI config space
* is accessible behind a window register to maintain the virtualization
* provided through vfio.
*/
typedef struct VFIOConfigWindowMatch {
uint32_t match;
uint32_t mask;
} VFIOConfigWindowMatch;
typedef struct VFIOConfigWindowQuirk {
struct VFIOPCIDevice *vdev;
uint32_t address_val;
uint32_t address_offset;
uint32_t data_offset;
bool window_enabled;
uint8_t bar;
MemoryRegion *addr_mem;
MemoryRegion *data_mem;
uint32_t nr_matches;
VFIOConfigWindowMatch matches[];
} VFIOConfigWindowQuirk;
static uint64_t vfio_generic_window_quirk_address_read(void *opaque,
hwaddr addr,
unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
return vfio_region_read(&vdev->bars[window->bar].region,
addr + window->address_offset, size);
}
static void vfio_generic_window_quirk_address_write(void *opaque, hwaddr addr,
uint64_t data,
unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
int i;
window->window_enabled = false;
vfio_region_write(&vdev->bars[window->bar].region,
addr + window->address_offset, data, size);
for (i = 0; i < window->nr_matches; i++) {
if ((data & ~window->matches[i].mask) == window->matches[i].match) {
window->window_enabled = true;
window->address_val = data & window->matches[i].mask;
trace_vfio_quirk_generic_window_address_write(vdev->vbasedev.name,
memory_region_name(window->addr_mem), data);
break;
}
}
}
static const MemoryRegionOps vfio_generic_window_address_quirk = {
.read = vfio_generic_window_quirk_address_read,
.write = vfio_generic_window_quirk_address_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_generic_window_quirk_data_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
uint64_t data;
/* Always read data reg, discard if window enabled */
data = vfio_region_read(&vdev->bars[window->bar].region,
addr + window->data_offset, size);
if (window->window_enabled) {
data = vfio_pci_read_config(&vdev->pdev, window->address_val, size);
trace_vfio_quirk_generic_window_data_read(vdev->vbasedev.name,
memory_region_name(window->data_mem), data);
}
return data;
}
static void vfio_generic_window_quirk_data_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
if (window->window_enabled) {
vfio_pci_write_config(&vdev->pdev, window->address_val, data, size);
trace_vfio_quirk_generic_window_data_write(vdev->vbasedev.name,
memory_region_name(window->data_mem), data);
return;
}
vfio_region_write(&vdev->bars[window->bar].region,
addr + window->data_offset, data, size);
}
static const MemoryRegionOps vfio_generic_window_data_quirk = {
.read = vfio_generic_window_quirk_data_read,
.write = vfio_generic_window_quirk_data_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/*
* The generic mirror quirk handles devices which expose PCI config space
* through a region within a BAR. When enabled, reads and writes are
* redirected through to emulated PCI config space. XXX if PCI config space
* used memory regions, this could just be an alias.
*/
typedef struct VFIOConfigMirrorQuirk {
struct VFIOPCIDevice *vdev;
uint32_t offset;
uint8_t bar;
MemoryRegion *mem;
uint8_t data[];
} VFIOConfigMirrorQuirk;
static uint64_t vfio_generic_quirk_mirror_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
uint64_t data;
/* Read and discard in case the hardware cares */
(void)vfio_region_read(&vdev->bars[mirror->bar].region,
addr + mirror->offset, size);
data = vfio_pci_read_config(&vdev->pdev, addr, size);
trace_vfio_quirk_generic_mirror_read(vdev->vbasedev.name,
memory_region_name(mirror->mem),
addr, data);
return data;
}
static void vfio_generic_quirk_mirror_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
vfio_pci_write_config(&vdev->pdev, addr, data, size);
trace_vfio_quirk_generic_mirror_write(vdev->vbasedev.name,
memory_region_name(mirror->mem),
addr, data);
}
static const MemoryRegionOps vfio_generic_mirror_quirk = {
.read = vfio_generic_quirk_mirror_read,
.write = vfio_generic_quirk_mirror_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/* 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);
}
#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)
{
VFIOPCIDevice *vdev = opaque;
uint64_t data = vfio_pci_read_config(&vdev->pdev,
PCI_BASE_ADDRESS_4 + 1, size);
trace_vfio_quirk_ati_3c3_read(vdev->vbasedev.name, data);
return data;
}
static const MemoryRegionOps vfio_ati_3c3_quirk = {
.read = vfio_ati_3c3_quirk_read,
.endianness = DEVICE_LITTLE_ENDIAN,
};
VFIOQuirk *vfio_quirk_alloc(int nr_mem)
{
VFIOQuirk *quirk = g_new0(VFIOQuirk, 1);
QLIST_INIT(&quirk->ioeventfds);
quirk->mem = g_new0(MemoryRegion, nr_mem);
quirk->nr_mem = nr_mem;
return quirk;
}
static void vfio_ioeventfd_exit(VFIOPCIDevice *vdev, VFIOIOEventFD *ioeventfd)
{
QLIST_REMOVE(ioeventfd, next);
memory_region_del_eventfd(ioeventfd->mr, ioeventfd->addr, ioeventfd->size,
true, ioeventfd->data, &ioeventfd->e);
if (ioeventfd->vfio) {
struct vfio_device_ioeventfd vfio_ioeventfd;
vfio_ioeventfd.argsz = sizeof(vfio_ioeventfd);
vfio_ioeventfd.flags = ioeventfd->size;
vfio_ioeventfd.data = ioeventfd->data;
vfio_ioeventfd.offset = ioeventfd->region->fd_offset +
ioeventfd->region_addr;
vfio_ioeventfd.fd = -1;
if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_IOEVENTFD, &vfio_ioeventfd)) {
error_report("Failed to remove vfio ioeventfd for %s+0x%"
HWADDR_PRIx"[%d]:0x%"PRIx64" (%m)",
memory_region_name(ioeventfd->mr), ioeventfd->addr,
ioeventfd->size, ioeventfd->data);
}
} else {
qemu_set_fd_handler(event_notifier_get_fd(&ioeventfd->e),
NULL, NULL, NULL);
}
event_notifier_cleanup(&ioeventfd->e);
trace_vfio_ioeventfd_exit(memory_region_name(ioeventfd->mr),
(uint64_t)ioeventfd->addr, ioeventfd->size,
ioeventfd->data);
g_free(ioeventfd);
}
static void vfio_drop_dynamic_eventfds(VFIOPCIDevice *vdev, VFIOQuirk *quirk)
{
VFIOIOEventFD *ioeventfd, *tmp;
QLIST_FOREACH_SAFE(ioeventfd, &quirk->ioeventfds, next, tmp) {
if (ioeventfd->dynamic) {
vfio_ioeventfd_exit(vdev, ioeventfd);
}
}
}
static void vfio_ioeventfd_handler(void *opaque)
{
VFIOIOEventFD *ioeventfd = opaque;
if (event_notifier_test_and_clear(&ioeventfd->e)) {
vfio_region_write(ioeventfd->region, ioeventfd->region_addr,
ioeventfd->data, ioeventfd->size);
trace_vfio_ioeventfd_handler(memory_region_name(ioeventfd->mr),
(uint64_t)ioeventfd->addr, ioeventfd->size,
ioeventfd->data);
}
}
static VFIOIOEventFD *vfio_ioeventfd_init(VFIOPCIDevice *vdev,
MemoryRegion *mr, hwaddr addr,
unsigned size, uint64_t data,
VFIORegion *region,
hwaddr region_addr, bool dynamic)
{
VFIOIOEventFD *ioeventfd;
if (vdev->no_kvm_ioeventfd) {
return NULL;
}
ioeventfd = g_malloc0(sizeof(*ioeventfd));
if (event_notifier_init(&ioeventfd->e, 0)) {
g_free(ioeventfd);
return NULL;
}
/*
* MemoryRegion and relative offset, plus additional ioeventfd setup
* parameters for configuring and later tearing down KVM ioeventfd.
*/
ioeventfd->mr = mr;
ioeventfd->addr = addr;
ioeventfd->size = size;
ioeventfd->data = data;
ioeventfd->dynamic = dynamic;
/*
* VFIORegion and relative offset for implementing the userspace
* handler. data & size fields shared for both uses.
*/
ioeventfd->region = region;
ioeventfd->region_addr = region_addr;
if (!vdev->no_vfio_ioeventfd) {
struct vfio_device_ioeventfd vfio_ioeventfd;
vfio_ioeventfd.argsz = sizeof(vfio_ioeventfd);
vfio_ioeventfd.flags = ioeventfd->size;
vfio_ioeventfd.data = ioeventfd->data;
vfio_ioeventfd.offset = ioeventfd->region->fd_offset +
ioeventfd->region_addr;
vfio_ioeventfd.fd = event_notifier_get_fd(&ioeventfd->e);
ioeventfd->vfio = !ioctl(vdev->vbasedev.fd,
VFIO_DEVICE_IOEVENTFD, &vfio_ioeventfd);
}
if (!ioeventfd->vfio) {
qemu_set_fd_handler(event_notifier_get_fd(&ioeventfd->e),
vfio_ioeventfd_handler, NULL, ioeventfd);
}
memory_region_add_eventfd(ioeventfd->mr, ioeventfd->addr, ioeventfd->size,
true, ioeventfd->data, &ioeventfd->e);
trace_vfio_ioeventfd_init(memory_region_name(mr), (uint64_t)addr,
size, data, ioeventfd->vfio);
return ioeventfd;
}
static void vfio_vga_probe_ati_3c3_quirk(VFIOPCIDevice *vdev)
{
VFIOQuirk *quirk;
/*
* 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 (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
!vdev->bars[4].ioport || vdev->bars[4].region.size < 256) {
return;
}
quirk = vfio_quirk_alloc(1);
memory_region_init_io(quirk->mem, OBJECT(vdev), &vfio_ati_3c3_quirk, vdev,
"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);
trace_vfio_quirk_ati_3c3_probe(vdev->vbasedev.name);
}
/*
* Newer ATI/AMD devices, including HD5450 and HD7850, have a mirror 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 read-only may be provided by hardware.
*/
static void vfio_probe_ati_bar4_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOConfigWindowQuirk *window;
/* This windows doesn't seem to be used except by legacy VGA code */
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
!vdev->vga || nr != 4) {
return;
}
quirk = vfio_quirk_alloc(2);
window = quirk->data = g_malloc0(sizeof(*window) +
sizeof(VFIOConfigWindowMatch));
window->vdev = vdev;
window->address_offset = 0;
window->data_offset = 4;
window->nr_matches = 1;
window->matches[0].match = 0x4000;
window->matches[0].mask = vdev->config_size - 1;
window->bar = nr;
window->addr_mem = &quirk->mem[0];
window->data_mem = &quirk->mem[1];
memory_region_init_io(window->addr_mem, OBJECT(vdev),
&vfio_generic_window_address_quirk, window,
"vfio-ati-bar4-window-address-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->address_offset,
window->addr_mem, 1);
memory_region_init_io(window->data_mem, OBJECT(vdev),
&vfio_generic_window_data_quirk, window,
"vfio-ati-bar4-window-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->data_offset,
window->data_mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_ati_bar4_probe(vdev->vbasedev.name);
}
/*
* Trap the BAR2 MMIO mirror to config space as well.
*/
static void vfio_probe_ati_bar2_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOConfigMirrorQuirk *mirror;
/* Only enable on newer devices where BAR2 is 64bit */
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
!vdev->vga || nr != 2 || !vdev->bars[2].mem64) {
return;
}
quirk = vfio_quirk_alloc(1);
mirror = quirk->data = g_malloc0(sizeof(*mirror));
mirror->mem = quirk->mem;
mirror->vdev = vdev;
mirror->offset = 0x4000;
mirror->bar = nr;
memory_region_init_io(mirror->mem, OBJECT(vdev),
&vfio_generic_mirror_quirk, mirror,
"vfio-ati-bar2-4000-quirk", PCI_CONFIG_SPACE_SIZE);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
mirror->offset, mirror->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_ati_bar2_probe(vdev->vbasedev.name);
}
/*
* 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.
*/
/*
* 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.
*/
typedef enum {NONE = 0, SELECT, WINDOW, READ, WRITE} VFIONvidia3d0State;
static const char *nv3d0_states[] = { "NONE", "SELECT",
"WINDOW", "READ", "WRITE" };
typedef struct VFIONvidia3d0Quirk {
VFIOPCIDevice *vdev;
VFIONvidia3d0State state;
uint32_t offset;
} VFIONvidia3d0Quirk;
static uint64_t vfio_nvidia_3d4_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
quirk->state = NONE;
return vfio_vga_read(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x14, size);
}
static void vfio_nvidia_3d4_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
VFIONvidia3d0State old_state = quirk->state;
quirk->state = NONE;
switch (data) {
case 0x338:
if (old_state == NONE) {
quirk->state = SELECT;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
}
break;
case 0x538:
if (old_state == WINDOW) {
quirk->state = READ;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
}
break;
case 0x738:
if (old_state == WINDOW) {
quirk->state = WRITE;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
}
break;
}
vfio_vga_write(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x14, data, size);
}
static const MemoryRegionOps vfio_nvidia_3d4_quirk = {
.read = vfio_nvidia_3d4_quirk_read,
.write = vfio_nvidia_3d4_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_nvidia_3d0_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
VFIONvidia3d0State old_state = quirk->state;
uint64_t data = vfio_vga_read(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x10, size);
quirk->state = NONE;
if (old_state == READ &&
(quirk->offset & ~(PCI_CONFIG_SPACE_SIZE - 1)) == 0x1800) {
uint8_t offset = quirk->offset & (PCI_CONFIG_SPACE_SIZE - 1);
data = vfio_pci_read_config(&vdev->pdev, offset, size);
trace_vfio_quirk_nvidia_3d0_read(vdev->vbasedev.name,
offset, size, data);
}
return data;
}
static void vfio_nvidia_3d0_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
VFIONvidia3d0State old_state = quirk->state;
quirk->state = NONE;
if (old_state == SELECT) {
quirk->offset = (uint32_t)data;
quirk->state = WINDOW;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
} else if (old_state == WRITE) {
if ((quirk->offset & ~(PCI_CONFIG_SPACE_SIZE - 1)) == 0x1800) {
uint8_t offset = quirk->offset & (PCI_CONFIG_SPACE_SIZE - 1);
vfio_pci_write_config(&vdev->pdev, offset, data, size);
trace_vfio_quirk_nvidia_3d0_write(vdev->vbasedev.name,
offset, data, size);
return;
}
}
vfio_vga_write(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x10, 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(VFIOPCIDevice *vdev)
{
VFIOQuirk *quirk;
VFIONvidia3d0Quirk *data;
if (vdev->no_geforce_quirks ||
!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) ||
!vdev->bars[1].region.size) {
return;
}
quirk = vfio_quirk_alloc(2);
quirk->data = data = g_malloc0(sizeof(*data));
data->vdev = vdev;
memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_nvidia_3d4_quirk,
data, "vfio-nvidia-3d4-quirk", 2);
memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem,
0x14 /* 0x3c0 + 0x14 */, &quirk->mem[0]);
memory_region_init_io(&quirk->mem[1], OBJECT(vdev), &vfio_nvidia_3d0_quirk,
data, "vfio-nvidia-3d0-quirk", 2);
memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem,
0x10 /* 0x3c0 + 0x10 */, &quirk->mem[1]);
QLIST_INSERT_HEAD(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks,
quirk, next);
trace_vfio_quirk_nvidia_3d0_probe(vdev->vbasedev.name);
}
/*
* 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.
*/
typedef struct VFIONvidiaBAR5Quirk {
uint32_t master;
uint32_t enable;
MemoryRegion *addr_mem;
MemoryRegion *data_mem;
bool enabled;
VFIOConfigWindowQuirk window; /* last for match data */
} VFIONvidiaBAR5Quirk;
static void vfio_nvidia_bar5_enable(VFIONvidiaBAR5Quirk *bar5)
{
VFIOPCIDevice *vdev = bar5->window.vdev;
if (((bar5->master & bar5->enable) & 0x1) == bar5->enabled) {
return;
}
bar5->enabled = !bar5->enabled;
trace_vfio_quirk_nvidia_bar5_state(vdev->vbasedev.name,
bar5->enabled ? "Enable" : "Disable");
memory_region_set_enabled(bar5->addr_mem, bar5->enabled);
memory_region_set_enabled(bar5->data_mem, bar5->enabled);
}
static uint64_t vfio_nvidia_bar5_quirk_master_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
return vfio_region_read(&vdev->bars[5].region, addr, size);
}
static void vfio_nvidia_bar5_quirk_master_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
vfio_region_write(&vdev->bars[5].region, addr, data, size);
bar5->master = data;
vfio_nvidia_bar5_enable(bar5);
}
static const MemoryRegionOps vfio_nvidia_bar5_quirk_master = {
.read = vfio_nvidia_bar5_quirk_master_read,
.write = vfio_nvidia_bar5_quirk_master_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_nvidia_bar5_quirk_enable_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
return vfio_region_read(&vdev->bars[5].region, addr + 4, size);
}
static void vfio_nvidia_bar5_quirk_enable_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
vfio_region_write(&vdev->bars[5].region, addr + 4, data, size);
bar5->enable = data;
vfio_nvidia_bar5_enable(bar5);
}
static const MemoryRegionOps vfio_nvidia_bar5_quirk_enable = {
.read = vfio_nvidia_bar5_quirk_enable_read,
.write = vfio_nvidia_bar5_quirk_enable_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_nvidia_bar5_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIONvidiaBAR5Quirk *bar5;
VFIOConfigWindowQuirk *window;
if (vdev->no_geforce_quirks ||
!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) ||
!vdev->vga || nr != 5 || !vdev->bars[5].ioport) {
return;
}
quirk = vfio_quirk_alloc(4);
bar5 = quirk->data = g_malloc0(sizeof(*bar5) +
(sizeof(VFIOConfigWindowMatch) * 2));
window = &bar5->window;
window->vdev = vdev;
window->address_offset = 0x8;
window->data_offset = 0xc;
window->nr_matches = 2;
window->matches[0].match = 0x1800;
window->matches[0].mask = PCI_CONFIG_SPACE_SIZE - 1;
window->matches[1].match = 0x88000;
window->matches[1].mask = vdev->config_size - 1;
window->bar = nr;
window->addr_mem = bar5->addr_mem = &quirk->mem[0];
window->data_mem = bar5->data_mem = &quirk->mem[1];
memory_region_init_io(window->addr_mem, OBJECT(vdev),
&vfio_generic_window_address_quirk, window,
"vfio-nvidia-bar5-window-address-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->address_offset,
window->addr_mem, 1);
memory_region_set_enabled(window->addr_mem, false);
memory_region_init_io(window->data_mem, OBJECT(vdev),
&vfio_generic_window_data_quirk, window,
"vfio-nvidia-bar5-window-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->data_offset,
window->data_mem, 1);
memory_region_set_enabled(window->data_mem, false);
memory_region_init_io(&quirk->mem[2], OBJECT(vdev),
&vfio_nvidia_bar5_quirk_master, bar5,
"vfio-nvidia-bar5-master-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0, &quirk->mem[2], 1);
memory_region_init_io(&quirk->mem[3], OBJECT(vdev),
&vfio_nvidia_bar5_quirk_enable, bar5,
"vfio-nvidia-bar5-enable-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
4, &quirk->mem[3], 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_nvidia_bar5_probe(vdev->vbasedev.name);
}
typedef struct LastDataSet {
VFIOQuirk *quirk;
hwaddr addr;
uint64_t data;
unsigned size;
int hits;
int added;
} LastDataSet;
#define MAX_DYN_IOEVENTFD 10
#define HITS_FOR_IOEVENTFD 10
/*
* Finally, BAR0 itself. We want to redirect any accesses to either
* 0x1800 or 0x88000 through the PCI config space access functions.
*/
static void vfio_nvidia_quirk_mirror_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
PCIDevice *pdev = &vdev->pdev;
LastDataSet *last = (LastDataSet *)&mirror->data;
vfio_generic_quirk_mirror_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.
*/
if ((pdev->cap_present & QEMU_PCI_CAP_MSI) &&
vfio_range_contained(addr, size, pdev->msi_cap, PCI_MSI_FLAGS)) {
vfio_region_write(&vdev->bars[mirror->bar].region,
addr + mirror->offset, data, size);
trace_vfio_quirk_nvidia_bar0_msi_ack(vdev->vbasedev.name);
}
/*
* Automatically add an ioeventfd to handle any repeated write with the
* same data and size above the standard PCI config space header. This is
* primarily expected to accelerate the MSI-ACK behavior, such as noted
* above. Current hardware/drivers should trigger an ioeventfd at config
* offset 0x704 (region offset 0x88704), with data 0x0, size 4.
*
* The criteria of 10 successive hits is arbitrary but reliably adds the
* MSI-ACK region. Note that as some writes are bypassed via the ioeventfd,
* the remaining ones have a greater chance of being seen successively.
* To avoid the pathological case of burning up all of QEMU's open file
* handles, arbitrarily limit this algorithm from adding no more than 10
* ioeventfds, print an error if we would have added an 11th, and then
* stop counting.
*/
if (!vdev->no_kvm_ioeventfd &&
addr >= PCI_STD_HEADER_SIZEOF && last->added <= MAX_DYN_IOEVENTFD) {
if (addr != last->addr || data != last->data || size != last->size) {
last->addr = addr;
last->data = data;
last->size = size;
last->hits = 1;
} else if (++last->hits >= HITS_FOR_IOEVENTFD) {
if (last->added < MAX_DYN_IOEVENTFD) {
VFIOIOEventFD *ioeventfd;
ioeventfd = vfio_ioeventfd_init(vdev, mirror->mem, addr, size,
data, &vdev->bars[mirror->bar].region,
mirror->offset + addr, true);
if (ioeventfd) {
VFIOQuirk *quirk = last->quirk;
QLIST_INSERT_HEAD(&quirk->ioeventfds, ioeventfd, next);
last->added++;
}
} else {
last->added++;
warn_report("NVIDIA ioeventfd queue full for %s, unable to "
"accelerate 0x%"HWADDR_PRIx", data 0x%"PRIx64", "
"size %u", vdev->vbasedev.name, addr, data, size);
}
}
}
}
static const MemoryRegionOps vfio_nvidia_mirror_quirk = {
.read = vfio_generic_quirk_mirror_read,
.write = vfio_nvidia_quirk_mirror_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_nvidia_bar0_quirk_reset(VFIOPCIDevice *vdev, VFIOQuirk *quirk)
{
VFIOConfigMirrorQuirk *mirror = quirk->data;
LastDataSet *last = (LastDataSet *)&mirror->data;
last->addr = last->data = last->size = last->hits = last->added = 0;
vfio_drop_dynamic_eventfds(vdev, quirk);
}
static void vfio_probe_nvidia_bar0_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOConfigMirrorQuirk *mirror;
LastDataSet *last;
if (vdev->no_geforce_quirks ||
!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) ||
!vfio_is_vga(vdev) || nr != 0) {
return;
}
quirk = vfio_quirk_alloc(1);
quirk->reset = vfio_nvidia_bar0_quirk_reset;
mirror = quirk->data = g_malloc0(sizeof(*mirror) + sizeof(LastDataSet));
mirror->mem = quirk->mem;
mirror->vdev = vdev;
mirror->offset = 0x88000;
mirror->bar = nr;
last = (LastDataSet *)&mirror->data;
last->quirk = quirk;
memory_region_init_io(mirror->mem, OBJECT(vdev),
&vfio_nvidia_mirror_quirk, mirror,
"vfio-nvidia-bar0-88000-mirror-quirk",
vdev->config_size);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
mirror->offset, mirror->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
/* The 0x1800 offset mirror only seems to get used by legacy VGA */
if (vdev->vga) {
quirk = vfio_quirk_alloc(1);
quirk->reset = vfio_nvidia_bar0_quirk_reset;
mirror = quirk->data = g_malloc0(sizeof(*mirror) + sizeof(LastDataSet));
mirror->mem = quirk->mem;
mirror->vdev = vdev;
mirror->offset = 0x1800;
mirror->bar = nr;
last = (LastDataSet *)&mirror->data;
last->quirk = quirk;
memory_region_init_io(mirror->mem, OBJECT(vdev),
&vfio_nvidia_mirror_quirk, mirror,
"vfio-nvidia-bar0-1800-mirror-quirk",
PCI_CONFIG_SPACE_SIZE);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
mirror->offset, mirror->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
}
trace_vfio_quirk_nvidia_bar0_probe(vdev->vbasedev.name);
}
/*
* 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.
*/
#define PCI_VENDOR_ID_REALTEK 0x10ec
/*
* RTL8168 devices have a backdoor that can access the MSI-X table. At BAR2
* offset 0x70 there is a dword data register, offset 0x74 is a dword address
* register. According to the Linux r8169 driver, the MSI-X table is addressed
* when the "type" portion of the address register is set to 0x1. This appears
* to be bits 16:30. Bit 31 is both a write indicator and some sort of
* "address latched" indicator. Bits 12:15 are a mask field, which we can
* ignore because the MSI-X table should always be accessed as a dword (full
* mask). Bits 0:11 is offset within the type.
*
* Example trace:
*
* Read from MSI-X table offset 0
* vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x1f000, 4) // store read addr
* vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x8001f000 // latch
* vfio: vfio_bar_read(0000:05:00.0:BAR2+0x70, 4) = 0xfee00398 // read data
*
* Write 0xfee00000 to MSI-X table offset 0
* vfio: vfio_bar_write(0000:05:00.0:BAR2+0x70, 0xfee00000, 4) // write data
* vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x8001f000, 4) // do write
* vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x1f000 // complete
*/
typedef struct VFIOrtl8168Quirk {
VFIOPCIDevice *vdev;
uint32_t addr;
uint32_t data;
bool enabled;
} VFIOrtl8168Quirk;
static uint64_t vfio_rtl8168_quirk_address_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
uint64_t data = vfio_region_read(&vdev->bars[2].region, addr + 0x74, size);
if (rtl->enabled) {
data = rtl->addr ^ 0x80000000U; /* latch/complete */
trace_vfio_quirk_rtl8168_fake_latch(vdev->vbasedev.name, data);
}
return data;
}
static void vfio_rtl8168_quirk_address_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
rtl->enabled = false;
if ((data & 0x7fff0000) == 0x10000) { /* MSI-X table */
rtl->enabled = true;
rtl->addr = (uint32_t)data;
if (data & 0x80000000U) { /* Do write */
if (vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX) {
hwaddr offset = data & 0xfff;
uint64_t val = rtl->data;
trace_vfio_quirk_rtl8168_msix_write(vdev->vbasedev.name,
(uint16_t)offset, val);
/* Write to the proper guest MSI-X table instead */
memory_region_dispatch_write(&vdev->pdev.msix_table_mmio,
offset, val,
size_memop(size) | MO_LE,
MEMTXATTRS_UNSPECIFIED);
}
return; /* Do not write guest MSI-X data to hardware */
}
}
vfio_region_write(&vdev->bars[2].region, addr + 0x74, data, size);
}
static const MemoryRegionOps vfio_rtl_address_quirk = {
.read = vfio_rtl8168_quirk_address_read,
.write = vfio_rtl8168_quirk_address_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_rtl8168_quirk_data_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
uint64_t data = vfio_region_read(&vdev->bars[2].region, addr + 0x70, size);
if (rtl->enabled && (vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX)) {
hwaddr offset = rtl->addr & 0xfff;
memory_region_dispatch_read(&vdev->pdev.msix_table_mmio, offset,
&data, size_memop(size) | MO_LE,
MEMTXATTRS_UNSPECIFIED);
trace_vfio_quirk_rtl8168_msix_read(vdev->vbasedev.name, offset, data);
}
return data;
}
static void vfio_rtl8168_quirk_data_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
rtl->data = (uint32_t)data;
vfio_region_write(&vdev->bars[2].region, addr + 0x70, data, size);
}
static const MemoryRegionOps vfio_rtl_data_quirk = {
.read = vfio_rtl8168_quirk_data_read,
.write = vfio_rtl8168_quirk_data_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_rtl8168_bar2_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOrtl8168Quirk *rtl;
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_REALTEK, 0x8168) || nr != 2) {
return;
}
quirk = vfio_quirk_alloc(2);
quirk->data = rtl = g_malloc0(sizeof(*rtl));
rtl->vdev = vdev;
memory_region_init_io(&quirk->mem[0], OBJECT(vdev),
&vfio_rtl_address_quirk, rtl,
"vfio-rtl8168-window-address-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0x74, &quirk->mem[0], 1);
memory_region_init_io(&quirk->mem[1], OBJECT(vdev),
&vfio_rtl_data_quirk, rtl,
"vfio-rtl8168-window-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0x70, &quirk->mem[1], 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_rtl8168_probe(vdev->vbasedev.name);
}
#define IGD_ASLS 0xfc /* ASL Storage Register */
/*
* The OpRegion includes the Video BIOS Table, which seems important for
* telling the driver what sort of outputs it has. Without this, the device
* may work in the guest, but we may not get output. This also requires BIOS
* support to reserve and populate a section of guest memory sufficient for
* the table and to write the base address of that memory to the ASLS register
* of the IGD device.
*/
int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
struct vfio_region_info *info, Error **errp)
{
int ret;
vdev->igd_opregion = g_malloc0(info->size);
ret = pread(vdev->vbasedev.fd, vdev->igd_opregion,
info->size, info->offset);
if (ret != info->size) {
error_setg(errp, "failed to read IGD OpRegion");
g_free(vdev->igd_opregion);
vdev->igd_opregion = NULL;
return -EINVAL;
}
/*
* Provide fw_cfg with a copy of the OpRegion which the VM firmware is to
* allocate 32bit reserved memory for, copy these contents into, and write
* the reserved memory base address to the device ASLS register at 0xFC.
* Alignment of this reserved region seems flexible, but using a 4k page
* alignment seems to work well. This interface assumes a single IGD
* device, which may be at VM address 00:02.0 in legacy mode or another
* address in UPT mode.
*
* NB, there may be future use cases discovered where the VM should have
* direct interaction with the host OpRegion, in which case the write to
* the ASLS register would trigger MemoryRegion setup to enable that.
*/
fw_cfg_add_file(fw_cfg_find(), "etc/igd-opregion",
vdev->igd_opregion, info->size);
trace_vfio_pci_igd_opregion_enabled(vdev->vbasedev.name);
pci_set_long(vdev->pdev.config + IGD_ASLS, 0);
pci_set_long(vdev->pdev.wmask + IGD_ASLS, ~0);
pci_set_long(vdev->emulated_config_bits + IGD_ASLS, ~0);
return 0;
}
/*
* Common quirk probe entry points.
*/
void vfio_vga_quirk_setup(VFIOPCIDevice *vdev)
{
vfio_vga_probe_ati_3c3_quirk(vdev);
vfio_vga_probe_nvidia_3d0_quirk(vdev);
}
void vfio_vga_quirk_exit(VFIOPCIDevice *vdev)
{
VFIOQuirk *quirk;
int i, j;
for (i = 0; i < ARRAY_SIZE(vdev->vga->region); i++) {
QLIST_FOREACH(quirk, &vdev->vga->region[i].quirks, next) {
for (j = 0; j < quirk->nr_mem; j++) {
memory_region_del_subregion(&vdev->vga->region[i].mem,
&quirk->mem[j]);
}
}
}
}
void vfio_vga_quirk_finalize(VFIOPCIDevice *vdev)
{
int i, j;
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);
QLIST_REMOVE(quirk, next);
for (j = 0; j < quirk->nr_mem; j++) {
object_unparent(OBJECT(&quirk->mem[j]));
}
g_free(quirk->mem);
g_free(quirk->data);
g_free(quirk);
}
}
}
void vfio_bar_quirk_setup(VFIOPCIDevice *vdev, int nr)
{
vfio_probe_ati_bar4_quirk(vdev, nr);
vfio_probe_ati_bar2_quirk(vdev, nr);
vfio_probe_nvidia_bar5_quirk(vdev, nr);
vfio_probe_nvidia_bar0_quirk(vdev, nr);
vfio_probe_rtl8168_bar2_quirk(vdev, nr);
#ifdef CONFIG_VFIO_IGD
vfio_probe_igd_bar4_quirk(vdev, nr);
#endif
}
void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
VFIOQuirk *quirk;
int i;
QLIST_FOREACH(quirk, &bar->quirks, next) {
while (!QLIST_EMPTY(&quirk->ioeventfds)) {
vfio_ioeventfd_exit(vdev, QLIST_FIRST(&quirk->ioeventfds));
}
for (i = 0; i < quirk->nr_mem; i++) {
memory_region_del_subregion(bar->region.mem, &quirk->mem[i]);
}
}
}
void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
int i;
while (!QLIST_EMPTY(&bar->quirks)) {
VFIOQuirk *quirk = QLIST_FIRST(&bar->quirks);
QLIST_REMOVE(quirk, next);
for (i = 0; i < quirk->nr_mem; i++) {
object_unparent(OBJECT(&quirk->mem[i]));
}
g_free(quirk->mem);
g_free(quirk->data);
g_free(quirk);
}
}
/*
* Reset quirks
*/
void vfio_quirk_reset(VFIOPCIDevice *vdev)
{
int i;
for (i = 0; i < PCI_ROM_SLOT; i++) {
VFIOQuirk *quirk;
VFIOBAR *bar = &vdev->bars[i];
QLIST_FOREACH(quirk, &bar->quirks, next) {
if (quirk->reset) {
quirk->reset(vdev, quirk);
}
}
}
}
/*
* AMD Radeon PCI config reset, based on Linux:
* drivers/gpu/drm/radeon/ci_smc.c:ci_is_smc_running()
* drivers/gpu/drm/radeon/radeon_device.c:radeon_pci_config_reset
* drivers/gpu/drm/radeon/ci_smc.c:ci_reset_smc()
* drivers/gpu/drm/radeon/ci_smc.c:ci_stop_smc_clock()
* IDs: include/drm/drm_pciids.h
* Registers: http://cgit.freedesktop.org/~agd5f/linux/commit/?id=4e2aa447f6f0
*
* Bonaire and Hawaii GPUs do not respond to a bus reset. This is a bug in the
* hardware that should be fixed on future ASICs. The symptom of this is that
* once the accerlated driver loads, Windows guests will bsod on subsequent
* attmpts to load the driver, such as after VM reset or shutdown/restart. To
* work around this, we do an AMD specific PCI config reset, followed by an SMC
* reset. The PCI config reset only works if SMC firmware is running, so we
* have a dependency on the state of the device as to whether this reset will
* be effective. There are still cases where we won't be able to kick the
* device into working, but this greatly improves the usability overall. The
* config reset magic is relatively common on AMD GPUs, but the setup and SMC
* poking is largely ASIC specific.
*/
static bool vfio_radeon_smc_is_running(VFIOPCIDevice *vdev)
{
uint32_t clk, pc_c;
/*
* Registers 200h and 204h are index and data registers for accessing
* indirect configuration registers within the device.
*/
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4);
clk = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000370, 4);
pc_c = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
return (!(clk & 1) && (0x20100 <= pc_c));
}
/*
* The scope of a config reset is controlled by a mode bit in the misc register
* and a fuse, exposed as a bit in another register. The fuse is the default
* (0 = GFX, 1 = whole GPU), the misc bit is a toggle, with the forumula
* scope = !(misc ^ fuse), where the resulting scope is defined the same as
* the fuse. A truth table therefore tells us that if misc == fuse, we need
* to flip the value of the bit in the misc register.
*/
static void vfio_radeon_set_gfx_only_reset(VFIOPCIDevice *vdev)
{
uint32_t misc, fuse;
bool a, b;
vfio_region_write(&vdev->bars[5].region, 0x200, 0xc00c0000, 4);
fuse = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
b = fuse & 64;
vfio_region_write(&vdev->bars[5].region, 0x200, 0xc0000010, 4);
misc = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
a = misc & 2;
if (a == b) {
vfio_region_write(&vdev->bars[5].region, 0x204, misc ^ 2, 4);
vfio_region_read(&vdev->bars[5].region, 0x204, 4); /* flush */
}
}
static int vfio_radeon_reset(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
int i, ret = 0;
uint32_t data;
/* Defer to a kernel implemented reset */
if (vdev->vbasedev.reset_works) {
trace_vfio_quirk_ati_bonaire_reset_skipped(vdev->vbasedev.name);
return -ENODEV;
}
/* Enable only memory BAR access */
vfio_pci_write_config(pdev, PCI_COMMAND, PCI_COMMAND_MEMORY, 2);
/* Reset only works if SMC firmware is loaded and running */
if (!vfio_radeon_smc_is_running(vdev)) {
ret = -EINVAL;
trace_vfio_quirk_ati_bonaire_reset_no_smc(vdev->vbasedev.name);
goto out;
}
/* Make sure only the GFX function is reset */
vfio_radeon_set_gfx_only_reset(vdev);
/* AMD PCI config reset */
vfio_pci_write_config(pdev, 0x7c, 0x39d5e86b, 4);
usleep(100);
/* Read back the memory size to make sure we're out of reset */
for (i = 0; i < 100000; i++) {
if (vfio_region_read(&vdev->bars[5].region, 0x5428, 4) != 0xffffffff) {
goto reset_smc;
}
usleep(1);
}
trace_vfio_quirk_ati_bonaire_reset_timeout(vdev->vbasedev.name);
reset_smc:
/* Reset SMC */
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000000, 4);
data = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
data |= 1;
vfio_region_write(&vdev->bars[5].region, 0x204, data, 4);
/* Disable SMC clock */
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4);
data = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
data |= 1;
vfio_region_write(&vdev->bars[5].region, 0x204, data, 4);
trace_vfio_quirk_ati_bonaire_reset_done(vdev->vbasedev.name);
out:
/* Restore PCI command register */
vfio_pci_write_config(pdev, PCI_COMMAND, 0, 2);
return ret;
}
void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev)
{
switch (vdev->vendor_id) {
case 0x1002:
switch (vdev->device_id) {
/* Bonaire */
case 0x6649: /* Bonaire [FirePro W5100] */
case 0x6650:
case 0x6651:
case 0x6658: /* Bonaire XTX [Radeon R7 260X] */
case 0x665c: /* Bonaire XT [Radeon HD 7790/8770 / R9 260 OEM] */
case 0x665d: /* Bonaire [Radeon R7 200 Series] */
/* Hawaii */
case 0x67A0: /* Hawaii XT GL [FirePro W9100] */
case 0x67A1: /* Hawaii PRO GL [FirePro W8100] */
case 0x67A2:
case 0x67A8:
case 0x67A9:
case 0x67AA:
case 0x67B0: /* Hawaii XT [Radeon R9 290X] */
case 0x67B1: /* Hawaii PRO [Radeon R9 290] */
case 0x67B8:
case 0x67B9:
case 0x67BA:
case 0x67BE:
vdev->resetfn = vfio_radeon_reset;
trace_vfio_quirk_ati_bonaire_reset(vdev->vbasedev.name);
break;
}
break;
}
}
/*
* The NVIDIA GPUDirect P2P Vendor capability allows the user to specify
* devices as a member of a clique. Devices within the same clique ID
* are capable of direct P2P. It's the user's responsibility that this
* is correct. The spec says that this may reside at any unused config
* offset, but reserves and recommends hypervisors place this at C8h.
* The spec also states that the hypervisor should place this capability
* at the end of the capability list, thus next is defined as 0h.
*
* +----------------+----------------+----------------+----------------+
* | sig 7:0 ('P') | vndr len (8h) | next (0h) | cap id (9h) |
* +----------------+----------------+----------------+----------------+
* | rsvd 15:7(0h),id 6:3,ver 2:0(0h)| sig 23:8 ('P2') |
* +---------------------------------+---------------------------------+
*
* https://lists.gnu.org/archive/html/qemu-devel/2017-08/pdfUda5iEpgOS.pdf
*/
static void get_nv_gpudirect_clique_id(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
uint8_t *ptr = qdev_get_prop_ptr(dev, prop);
visit_type_uint8(v, name, ptr, errp);
}
static void set_nv_gpudirect_clique_id(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
uint8_t value, *ptr = qdev_get_prop_ptr(dev, prop);
Error *local_err = NULL;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_uint8(v, name, &value, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (value & ~0xF) {
error_setg(errp, "Property %s: valid range 0-15", name);
return;
}
*ptr = value;
}
const PropertyInfo qdev_prop_nv_gpudirect_clique = {
.name = "uint4",
.description = "NVIDIA GPUDirect Clique ID (0 - 15)",
.get = get_nv_gpudirect_clique_id,
.set = set_nv_gpudirect_clique_id,
};
static int vfio_add_nv_gpudirect_cap(VFIOPCIDevice *vdev, Error **errp)
{
PCIDevice *pdev = &vdev->pdev;
int ret, pos = 0xC8;
if (vdev->nv_gpudirect_clique == 0xFF) {
return 0;
}
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID)) {
error_setg(errp, "NVIDIA GPUDirect Clique ID: invalid device vendor");
return -EINVAL;
}
if (pci_get_byte(pdev->config + PCI_CLASS_DEVICE + 1) !=
PCI_BASE_CLASS_DISPLAY) {
error_setg(errp, "NVIDIA GPUDirect Clique ID: unsupported PCI class");
return -EINVAL;
}
ret = pci_add_capability(pdev, PCI_CAP_ID_VNDR, pos, 8, errp);
if (ret < 0) {
error_prepend(errp, "Failed to add NVIDIA GPUDirect cap: ");
return ret;
}
memset(vdev->emulated_config_bits + pos, 0xFF, 8);
pos += PCI_CAP_FLAGS;
pci_set_byte(pdev->config + pos++, 8);
pci_set_byte(pdev->config + pos++, 'P');
pci_set_byte(pdev->config + pos++, '2');
pci_set_byte(pdev->config + pos++, 'P');
pci_set_byte(pdev->config + pos++, vdev->nv_gpudirect_clique << 3);
pci_set_byte(pdev->config + pos, 0);
return 0;
}
int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **errp)
{
int ret;
ret = vfio_add_nv_gpudirect_cap(vdev, errp);
if (ret) {
return ret;
}
return 0;
}
static void vfio_pci_nvlink2_get_tgt(Object *obj, Visitor *v,
const char *name,
void *opaque, Error **errp)
{
uint64_t tgt = (uintptr_t) opaque;
visit_type_uint64(v, name, &tgt, errp);
}
static void vfio_pci_nvlink2_get_link_speed(Object *obj, Visitor *v,
const char *name,
void *opaque, Error **errp)
{
uint32_t link_speed = (uint32_t)(uintptr_t) opaque;
visit_type_uint32(v, name, &link_speed, errp);
}
int vfio_pci_nvidia_v100_ram_init(VFIOPCIDevice *vdev, Error **errp)
{
int ret;
void *p;
struct vfio_region_info *nv2reg = NULL;
struct vfio_info_cap_header *hdr;
struct vfio_region_info_cap_nvlink2_ssatgt *cap;
VFIOQuirk *quirk;
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE |
PCI_VENDOR_ID_NVIDIA,
VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM,
&nv2reg);
if (ret) {
return ret;
}
hdr = vfio_get_region_info_cap(nv2reg, VFIO_REGION_INFO_CAP_NVLINK2_SSATGT);
if (!hdr) {
ret = -ENODEV;
goto free_exit;
}
cap = (void *) hdr;
p = mmap(NULL, nv2reg->size, PROT_READ | PROT_WRITE,
MAP_SHARED, vdev->vbasedev.fd, nv2reg->offset);
if (p == MAP_FAILED) {
ret = -errno;
goto free_exit;
}
quirk = vfio_quirk_alloc(1);
memory_region_init_ram_ptr(&quirk->mem[0], OBJECT(vdev), "nvlink2-mr",
nv2reg->size, p);
QLIST_INSERT_HEAD(&vdev->bars[0].quirks, quirk, next);
object_property_add(OBJECT(vdev), "nvlink2-tgt", "uint64",
vfio_pci_nvlink2_get_tgt, NULL, NULL,
(void *) (uintptr_t) cap->tgt);
trace_vfio_pci_nvidia_gpu_setup_quirk(vdev->vbasedev.name, cap->tgt,
nv2reg->size);
free_exit:
g_free(nv2reg);
return ret;
}
int vfio_pci_nvlink2_init(VFIOPCIDevice *vdev, Error **errp)
{
int ret;
void *p;
struct vfio_region_info *atsdreg = NULL;
struct vfio_info_cap_header *hdr;
struct vfio_region_info_cap_nvlink2_ssatgt *captgt;
struct vfio_region_info_cap_nvlink2_lnkspd *capspeed;
VFIOQuirk *quirk;
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE |
PCI_VENDOR_ID_IBM,
VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD,
&atsdreg);
if (ret) {
return ret;
}
hdr = vfio_get_region_info_cap(atsdreg,
VFIO_REGION_INFO_CAP_NVLINK2_SSATGT);
if (!hdr) {
ret = -ENODEV;
goto free_exit;
}
captgt = (void *) hdr;
hdr = vfio_get_region_info_cap(atsdreg,
VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD);
if (!hdr) {
ret = -ENODEV;
goto free_exit;
}
capspeed = (void *) hdr;
/* Some NVLink bridges may not have assigned ATSD */
if (atsdreg->size) {
p = mmap(NULL, atsdreg->size, PROT_READ | PROT_WRITE,
MAP_SHARED, vdev->vbasedev.fd, atsdreg->offset);
if (p == MAP_FAILED) {
ret = -errno;
goto free_exit;
}
quirk = vfio_quirk_alloc(1);
memory_region_init_ram_device_ptr(&quirk->mem[0], OBJECT(vdev),
"nvlink2-atsd-mr", atsdreg->size, p);
QLIST_INSERT_HEAD(&vdev->bars[0].quirks, quirk, next);
}
object_property_add(OBJECT(vdev), "nvlink2-tgt", "uint64",
vfio_pci_nvlink2_get_tgt, NULL, NULL,
(void *) (uintptr_t) captgt->tgt);
trace_vfio_pci_nvlink2_setup_quirk_ssatgt(vdev->vbasedev.name, captgt->tgt,
atsdreg->size);
object_property_add(OBJECT(vdev), "nvlink2-link-speed", "uint32",
vfio_pci_nvlink2_get_link_speed, NULL, NULL,
(void *) (uintptr_t) capspeed->link_speed);
trace_vfio_pci_nvlink2_setup_quirk_lnkspd(vdev->vbasedev.name,
capspeed->link_speed);
free_exit:
g_free(atsdreg);
return ret;
}
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