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qemu/xen-all.c
Stefano Stabellini fc744bb10c Revert "xen: start PCI hole at 0xe0000000 (same as pc_init1 and qemu-xen-traditional)" 
This reverts commit 9f24a8030a.

The start of the PCI hole is actually set to 0xf0000000 by hvmloader.
In order to retain ABI compatibility with Xen we leave the start of the
PCI hole at 0xf0000000 in QEMU (for Xen) too.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2013-06-25 11:59:42 +00:00

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/*
* Copyright (C) 2010 Citrix Ltd.
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include <sys/mman.h>
#include "hw/pci/pci.h"
#include "hw/i386/pc.h"
#include "hw/xen/xen_common.h"
#include "hw/xen/xen_backend.h"
#include "qmp-commands.h"
#include "sysemu/char.h"
#include "qemu/range.h"
#include "sysemu/xen-mapcache.h"
#include "trace.h"
#include "exec/address-spaces.h"
#include <xen/hvm/ioreq.h>
#include <xen/hvm/params.h>
#include <xen/hvm/e820.h>
//#define DEBUG_XEN
#ifdef DEBUG_XEN
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
static MemoryRegion ram_memory, ram_640k, ram_lo, ram_hi;
static MemoryRegion *framebuffer;
static bool xen_in_migration;
/* Compatibility with older version */
#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
return shared_page->vcpu_iodata[i].vp_eport;
}
static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
{
return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
}
# define FMT_ioreq_size PRIx64
#else
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
return shared_page->vcpu_ioreq[i].vp_eport;
}
static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
{
return &shared_page->vcpu_ioreq[vcpu];
}
# define FMT_ioreq_size "u"
#endif
#ifndef HVM_PARAM_BUFIOREQ_EVTCHN
#define HVM_PARAM_BUFIOREQ_EVTCHN 26
#endif
#define BUFFER_IO_MAX_DELAY 100
typedef struct XenPhysmap {
hwaddr start_addr;
ram_addr_t size;
char *name;
hwaddr phys_offset;
QLIST_ENTRY(XenPhysmap) list;
} XenPhysmap;
typedef struct XenIOState {
shared_iopage_t *shared_page;
buffered_iopage_t *buffered_io_page;
QEMUTimer *buffered_io_timer;
/* the evtchn port for polling the notification, */
evtchn_port_t *ioreq_local_port;
/* evtchn local port for buffered io */
evtchn_port_t bufioreq_local_port;
/* the evtchn fd for polling */
XenEvtchn xce_handle;
/* which vcpu we are serving */
int send_vcpu;
struct xs_handle *xenstore;
MemoryListener memory_listener;
QLIST_HEAD(, XenPhysmap) physmap;
hwaddr free_phys_offset;
const XenPhysmap *log_for_dirtybit;
Notifier exit;
Notifier suspend;
} XenIOState;
/* Xen specific function for piix pci */
int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
{
return irq_num + ((pci_dev->devfn >> 3) << 2);
}
void xen_piix3_set_irq(void *opaque, int irq_num, int level)
{
xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
irq_num & 3, level);
}
void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
{
int i;
/* Scan for updates to PCI link routes (0x60-0x63). */
for (i = 0; i < len; i++) {
uint8_t v = (val >> (8 * i)) & 0xff;
if (v & 0x80) {
v = 0;
}
v &= 0xf;
if (((address + i) >= 0x60) && ((address + i) <= 0x63)) {
xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
}
}
}
void xen_hvm_inject_msi(uint64_t addr, uint32_t data)
{
xen_xc_hvm_inject_msi(xen_xc, xen_domid, addr, data);
}
static void xen_suspend_notifier(Notifier *notifier, void *data)
{
xc_set_hvm_param(xen_xc, xen_domid, HVM_PARAM_ACPI_S_STATE, 3);
}
/* Xen Interrupt Controller */
static void xen_set_irq(void *opaque, int irq, int level)
{
xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
}
qemu_irq *xen_interrupt_controller_init(void)
{
return qemu_allocate_irqs(xen_set_irq, NULL, 16);
}
/* Memory Ops */
static void xen_ram_init(ram_addr_t ram_size)
{
MemoryRegion *sysmem = get_system_memory();
ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
ram_addr_t block_len;
block_len = ram_size;
if (ram_size >= HVM_BELOW_4G_RAM_END) {
/* Xen does not allocate the memory continuously, and keep a hole at
* HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
*/
block_len += HVM_BELOW_4G_MMIO_LENGTH;
}
memory_region_init_ram(&ram_memory, "xen.ram", block_len);
vmstate_register_ram_global(&ram_memory);
if (ram_size >= HVM_BELOW_4G_RAM_END) {
above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
below_4g_mem_size = HVM_BELOW_4G_RAM_END;
} else {
below_4g_mem_size = ram_size;
}
memory_region_init_alias(&ram_640k, "xen.ram.640k",
&ram_memory, 0, 0xa0000);
memory_region_add_subregion(sysmem, 0, &ram_640k);
/* Skip of the VGA IO memory space, it will be registered later by the VGA
* emulated device.
*
* The area between 0xc0000 and 0x100000 will be used by SeaBIOS to load
* the Options ROM, so it is registered here as RAM.
*/
memory_region_init_alias(&ram_lo, "xen.ram.lo",
&ram_memory, 0xc0000, below_4g_mem_size - 0xc0000);
memory_region_add_subregion(sysmem, 0xc0000, &ram_lo);
if (above_4g_mem_size > 0) {
memory_region_init_alias(&ram_hi, "xen.ram.hi",
&ram_memory, 0x100000000ULL,
above_4g_mem_size);
memory_region_add_subregion(sysmem, 0x100000000ULL, &ram_hi);
}
}
void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr)
{
unsigned long nr_pfn;
xen_pfn_t *pfn_list;
int i;
if (runstate_check(RUN_STATE_INMIGRATE)) {
/* RAM already populated in Xen */
fprintf(stderr, "%s: do not alloc "RAM_ADDR_FMT
" bytes of ram at "RAM_ADDR_FMT" when runstate is INMIGRATE\n",
__func__, size, ram_addr);
return;
}
if (mr == &ram_memory) {
return;
}
trace_xen_ram_alloc(ram_addr, size);
nr_pfn = size >> TARGET_PAGE_BITS;
pfn_list = g_malloc(sizeof (*pfn_list) * nr_pfn);
for (i = 0; i < nr_pfn; i++) {
pfn_list[i] = (ram_addr >> TARGET_PAGE_BITS) + i;
}
if (xc_domain_populate_physmap_exact(xen_xc, xen_domid, nr_pfn, 0, 0, pfn_list)) {
hw_error("xen: failed to populate ram at " RAM_ADDR_FMT, ram_addr);
}
g_free(pfn_list);
}
static XenPhysmap *get_physmapping(XenIOState *state,
hwaddr start_addr, ram_addr_t size)
{
XenPhysmap *physmap = NULL;
start_addr &= TARGET_PAGE_MASK;
QLIST_FOREACH(physmap, &state->physmap, list) {
if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
return physmap;
}
}
return NULL;
}
static hwaddr xen_phys_offset_to_gaddr(hwaddr start_addr,
ram_addr_t size, void *opaque)
{
hwaddr addr = start_addr & TARGET_PAGE_MASK;
XenIOState *xen_io_state = opaque;
XenPhysmap *physmap = NULL;
QLIST_FOREACH(physmap, &xen_io_state->physmap, list) {
if (range_covers_byte(physmap->phys_offset, physmap->size, addr)) {
return physmap->start_addr;
}
}
return start_addr;
}
#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
static int xen_add_to_physmap(XenIOState *state,
hwaddr start_addr,
ram_addr_t size,
MemoryRegion *mr,
hwaddr offset_within_region)
{
unsigned long i = 0;
int rc = 0;
XenPhysmap *physmap = NULL;
hwaddr pfn, start_gpfn;
hwaddr phys_offset = memory_region_get_ram_addr(mr);
char path[80], value[17];
if (get_physmapping(state, start_addr, size)) {
return 0;
}
if (size <= 0) {
return -1;
}
/* Xen can only handle a single dirty log region for now and we want
* the linear framebuffer to be that region.
* Avoid tracking any regions that is not videoram and avoid tracking
* the legacy vga region. */
if (mr == framebuffer && start_addr > 0xbffff) {
goto go_physmap;
}
return -1;
go_physmap:
DPRINTF("mapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx"\n",
start_addr, start_addr + size);
pfn = phys_offset >> TARGET_PAGE_BITS;
start_gpfn = start_addr >> TARGET_PAGE_BITS;
for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
unsigned long idx = pfn + i;
xen_pfn_t gpfn = start_gpfn + i;
rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
if (rc) {
DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
return -rc;
}
}
physmap = g_malloc(sizeof (XenPhysmap));
physmap->start_addr = start_addr;
physmap->size = size;
physmap->name = (char *)mr->name;
physmap->phys_offset = phys_offset;
QLIST_INSERT_HEAD(&state->physmap, physmap, list);
xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
start_addr >> TARGET_PAGE_BITS,
(start_addr + size) >> TARGET_PAGE_BITS,
XEN_DOMCTL_MEM_CACHEATTR_WB);
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/start_addr",
xen_domid, (uint64_t)phys_offset);
snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)start_addr);
if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
return -1;
}
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/size",
xen_domid, (uint64_t)phys_offset);
snprintf(value, sizeof(value), "%"PRIx64, (uint64_t)size);
if (!xs_write(state->xenstore, 0, path, value, strlen(value))) {
return -1;
}
if (mr->name) {
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap/%"PRIx64"/name",
xen_domid, (uint64_t)phys_offset);
if (!xs_write(state->xenstore, 0, path, mr->name, strlen(mr->name))) {
return -1;
}
}
return 0;
}
static int xen_remove_from_physmap(XenIOState *state,
hwaddr start_addr,
ram_addr_t size)
{
unsigned long i = 0;
int rc = 0;
XenPhysmap *physmap = NULL;
hwaddr phys_offset = 0;
physmap = get_physmapping(state, start_addr, size);
if (physmap == NULL) {
return -1;
}
phys_offset = physmap->phys_offset;
size = physmap->size;
DPRINTF("unmapping vram to %"HWADDR_PRIx" - %"HWADDR_PRIx", from ",
"%"HWADDR_PRIx"\n", phys_offset, phys_offset + size, start_addr);
size >>= TARGET_PAGE_BITS;
start_addr >>= TARGET_PAGE_BITS;
phys_offset >>= TARGET_PAGE_BITS;
for (i = 0; i < size; i++) {
unsigned long idx = start_addr + i;
xen_pfn_t gpfn = phys_offset + i;
rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
if (rc) {
fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
return -rc;
}
}
QLIST_REMOVE(physmap, list);
if (state->log_for_dirtybit == physmap) {
state->log_for_dirtybit = NULL;
}
g_free(physmap);
return 0;
}
#else
static int xen_add_to_physmap(XenIOState *state,
hwaddr start_addr,
ram_addr_t size,
MemoryRegion *mr,
hwaddr offset_within_region)
{
return -ENOSYS;
}
static int xen_remove_from_physmap(XenIOState *state,
hwaddr start_addr,
ram_addr_t size)
{
return -ENOSYS;
}
#endif
static void xen_set_memory(struct MemoryListener *listener,
MemoryRegionSection *section,
bool add)
{
XenIOState *state = container_of(listener, XenIOState, memory_listener);
hwaddr start_addr = section->offset_within_address_space;
ram_addr_t size = int128_get64(section->size);
bool log_dirty = memory_region_is_logging(section->mr);
hvmmem_type_t mem_type;
if (!memory_region_is_ram(section->mr)) {
return;
}
if (!(section->mr != &ram_memory
&& ( (log_dirty && add) || (!log_dirty && !add)))) {
return;
}
trace_xen_client_set_memory(start_addr, size, log_dirty);
start_addr &= TARGET_PAGE_MASK;
size = TARGET_PAGE_ALIGN(size);
if (add) {
if (!memory_region_is_rom(section->mr)) {
xen_add_to_physmap(state, start_addr, size,
section->mr, section->offset_within_region);
} else {
mem_type = HVMMEM_ram_ro;
if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
start_addr >> TARGET_PAGE_BITS,
size >> TARGET_PAGE_BITS)) {
DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
start_addr);
}
}
} else {
if (xen_remove_from_physmap(state, start_addr, size) < 0) {
DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr);
}
}
}
static void xen_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
xen_set_memory(listener, section, true);
}
static void xen_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
xen_set_memory(listener, section, false);
}
static void xen_sync_dirty_bitmap(XenIOState *state,
hwaddr start_addr,
ram_addr_t size)
{
hwaddr npages = size >> TARGET_PAGE_BITS;
const int width = sizeof(unsigned long) * 8;
unsigned long bitmap[(npages + width - 1) / width];
int rc, i, j;
const XenPhysmap *physmap = NULL;
physmap = get_physmapping(state, start_addr, size);
if (physmap == NULL) {
/* not handled */
return;
}
if (state->log_for_dirtybit == NULL) {
state->log_for_dirtybit = physmap;
} else if (state->log_for_dirtybit != physmap) {
/* Only one range for dirty bitmap can be tracked. */
return;
}
rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
start_addr >> TARGET_PAGE_BITS, npages,
bitmap);
if (rc < 0) {
if (rc != -ENODATA) {
memory_region_set_dirty(framebuffer, 0, size);
DPRINTF("xen: track_dirty_vram failed (0x" TARGET_FMT_plx
", 0x" TARGET_FMT_plx "): %s\n",
start_addr, start_addr + size, strerror(-rc));
}
return;
}
for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
unsigned long map = bitmap[i];
while (map != 0) {
j = ffsl(map) - 1;
map &= ~(1ul << j);
memory_region_set_dirty(framebuffer,
(i * width + j) * TARGET_PAGE_SIZE,
TARGET_PAGE_SIZE);
};
}
}
static void xen_log_start(MemoryListener *listener,
MemoryRegionSection *section)
{
XenIOState *state = container_of(listener, XenIOState, memory_listener);
xen_sync_dirty_bitmap(state, section->offset_within_address_space,
int128_get64(section->size));
}
static void xen_log_stop(MemoryListener *listener, MemoryRegionSection *section)
{
XenIOState *state = container_of(listener, XenIOState, memory_listener);
state->log_for_dirtybit = NULL;
/* Disable dirty bit tracking */
xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
}
static void xen_log_sync(MemoryListener *listener, MemoryRegionSection *section)
{
XenIOState *state = container_of(listener, XenIOState, memory_listener);
xen_sync_dirty_bitmap(state, section->offset_within_address_space,
int128_get64(section->size));
}
static void xen_log_global_start(MemoryListener *listener)
{
if (xen_enabled()) {
xen_in_migration = true;
}
}
static void xen_log_global_stop(MemoryListener *listener)
{
xen_in_migration = false;
}
static MemoryListener xen_memory_listener = {
.region_add = xen_region_add,
.region_del = xen_region_del,
.log_start = xen_log_start,
.log_stop = xen_log_stop,
.log_sync = xen_log_sync,
.log_global_start = xen_log_global_start,
.log_global_stop = xen_log_global_stop,
.priority = 10,
};
void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
{
if (enable) {
memory_global_dirty_log_start();
} else {
memory_global_dirty_log_stop();
}
}
/* get the ioreq packets from share mem */
static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
{
ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
if (req->state != STATE_IOREQ_READY) {
DPRINTF("I/O request not ready: "
"%x, ptr: %x, port: %"PRIx64", "
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
req->state, req->data_is_ptr, req->addr,
req->data, req->count, req->size);
return NULL;
}
xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
req->state = STATE_IOREQ_INPROCESS;
return req;
}
/* use poll to get the port notification */
/* ioreq_vec--out,the */
/* retval--the number of ioreq packet */
static ioreq_t *cpu_get_ioreq(XenIOState *state)
{
int i;
evtchn_port_t port;
port = xc_evtchn_pending(state->xce_handle);
if (port == state->bufioreq_local_port) {
qemu_mod_timer(state->buffered_io_timer,
BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
return NULL;
}
if (port != -1) {
for (i = 0; i < smp_cpus; i++) {
if (state->ioreq_local_port[i] == port) {
break;
}
}
if (i == smp_cpus) {
hw_error("Fatal error while trying to get io event!\n");
}
/* unmask the wanted port again */
xc_evtchn_unmask(state->xce_handle, port);
/* get the io packet from shared memory */
state->send_vcpu = i;
return cpu_get_ioreq_from_shared_memory(state, i);
}
/* read error or read nothing */
return NULL;
}
static uint32_t do_inp(pio_addr_t addr, unsigned long size)
{
switch (size) {
case 1:
return cpu_inb(addr);
case 2:
return cpu_inw(addr);
case 4:
return cpu_inl(addr);
default:
hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
}
}
static void do_outp(pio_addr_t addr,
unsigned long size, uint32_t val)
{
switch (size) {
case 1:
return cpu_outb(addr, val);
case 2:
return cpu_outw(addr, val);
case 4:
return cpu_outl(addr, val);
default:
hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
}
}
/*
* Helper functions which read/write an object from/to physical guest
* memory, as part of the implementation of an ioreq.
*
* Equivalent to
* cpu_physical_memory_rw(addr + (req->df ? -1 : +1) * req->size * i,
* val, req->size, 0/1)
* except without the integer overflow problems.
*/
static void rw_phys_req_item(hwaddr addr,
ioreq_t *req, uint32_t i, void *val, int rw)
{
/* Do everything unsigned so overflow just results in a truncated result
* and accesses to undesired parts of guest memory, which is up
* to the guest */
hwaddr offset = (hwaddr)req->size * i;
if (req->df) {
addr -= offset;
} else {
addr += offset;
}
cpu_physical_memory_rw(addr, val, req->size, rw);
}
static inline void read_phys_req_item(hwaddr addr,
ioreq_t *req, uint32_t i, void *val)
{
rw_phys_req_item(addr, req, i, val, 0);
}
static inline void write_phys_req_item(hwaddr addr,
ioreq_t *req, uint32_t i, void *val)
{
rw_phys_req_item(addr, req, i, val, 1);
}
static void cpu_ioreq_pio(ioreq_t *req)
{
uint32_t i;
if (req->dir == IOREQ_READ) {
if (!req->data_is_ptr) {
req->data = do_inp(req->addr, req->size);
} else {
uint32_t tmp;
for (i = 0; i < req->count; i++) {
tmp = do_inp(req->addr, req->size);
write_phys_req_item(req->data, req, i, &tmp);
}
}
} else if (req->dir == IOREQ_WRITE) {
if (!req->data_is_ptr) {
do_outp(req->addr, req->size, req->data);
} else {
for (i = 0; i < req->count; i++) {
uint32_t tmp = 0;
read_phys_req_item(req->data, req, i, &tmp);
do_outp(req->addr, req->size, tmp);
}
}
}
}
static void cpu_ioreq_move(ioreq_t *req)
{
uint32_t i;
if (!req->data_is_ptr) {
if (req->dir == IOREQ_READ) {
for (i = 0; i < req->count; i++) {
read_phys_req_item(req->addr, req, i, &req->data);
}
} else if (req->dir == IOREQ_WRITE) {
for (i = 0; i < req->count; i++) {
write_phys_req_item(req->addr, req, i, &req->data);
}
}
} else {
uint64_t tmp;
if (req->dir == IOREQ_READ) {
for (i = 0; i < req->count; i++) {
read_phys_req_item(req->addr, req, i, &tmp);
write_phys_req_item(req->data, req, i, &tmp);
}
} else if (req->dir == IOREQ_WRITE) {
for (i = 0; i < req->count; i++) {
read_phys_req_item(req->data, req, i, &tmp);
write_phys_req_item(req->addr, req, i, &tmp);
}
}
}
}
static void handle_ioreq(ioreq_t *req)
{
if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
(req->size < sizeof (target_ulong))) {
req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
}
switch (req->type) {
case IOREQ_TYPE_PIO:
cpu_ioreq_pio(req);
break;
case IOREQ_TYPE_COPY:
cpu_ioreq_move(req);
break;
case IOREQ_TYPE_TIMEOFFSET:
break;
case IOREQ_TYPE_INVALIDATE:
xen_invalidate_map_cache();
break;
default:
hw_error("Invalid ioreq type 0x%x\n", req->type);
}
}
static int handle_buffered_iopage(XenIOState *state)
{
buf_ioreq_t *buf_req = NULL;
ioreq_t req;
int qw;
if (!state->buffered_io_page) {
return 0;
}
memset(&req, 0x00, sizeof(req));
while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
buf_req = &state->buffered_io_page->buf_ioreq[
state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
req.size = 1UL << buf_req->size;
req.count = 1;
req.addr = buf_req->addr;
req.data = buf_req->data;
req.state = STATE_IOREQ_READY;
req.dir = buf_req->dir;
req.df = 1;
req.type = buf_req->type;
req.data_is_ptr = 0;
qw = (req.size == 8);
if (qw) {
buf_req = &state->buffered_io_page->buf_ioreq[
(state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
req.data |= ((uint64_t)buf_req->data) << 32;
}
handle_ioreq(&req);
xen_mb();
state->buffered_io_page->read_pointer += qw ? 2 : 1;
}
return req.count;
}
static void handle_buffered_io(void *opaque)
{
XenIOState *state = opaque;
if (handle_buffered_iopage(state)) {
qemu_mod_timer(state->buffered_io_timer,
BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
} else {
qemu_del_timer(state->buffered_io_timer);
xc_evtchn_unmask(state->xce_handle, state->bufioreq_local_port);
}
}
static void cpu_handle_ioreq(void *opaque)
{
XenIOState *state = opaque;
ioreq_t *req = cpu_get_ioreq(state);
handle_buffered_iopage(state);
if (req) {
handle_ioreq(req);
if (req->state != STATE_IOREQ_INPROCESS) {
fprintf(stderr, "Badness in I/O request ... not in service?!: "
"%x, ptr: %x, port: %"PRIx64", "
"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
req->state, req->data_is_ptr, req->addr,
req->data, req->count, req->size);
destroy_hvm_domain(false);
return;
}
xen_wmb(); /* Update ioreq contents /then/ update state. */
/*
* We do this before we send the response so that the tools
* have the opportunity to pick up on the reset before the
* guest resumes and does a hlt with interrupts disabled which
* causes Xen to powerdown the domain.
*/
if (runstate_is_running()) {
if (qemu_shutdown_requested_get()) {
destroy_hvm_domain(false);
}
if (qemu_reset_requested_get()) {
qemu_system_reset(VMRESET_REPORT);
destroy_hvm_domain(true);
}
}
req->state = STATE_IORESP_READY;
xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
}
}
static int store_dev_info(int domid, CharDriverState *cs, const char *string)
{
struct xs_handle *xs = NULL;
char *path = NULL;
char *newpath = NULL;
char *pts = NULL;
int ret = -1;
/* Only continue if we're talking to a pty. */
if (strncmp(cs->filename, "pty:", 4)) {
return 0;
}
pts = cs->filename + 4;
/* We now have everything we need to set the xenstore entry. */
xs = xs_open(0);
if (xs == NULL) {
fprintf(stderr, "Could not contact XenStore\n");
goto out;
}
path = xs_get_domain_path(xs, domid);
if (path == NULL) {
fprintf(stderr, "xs_get_domain_path() error\n");
goto out;
}
newpath = realloc(path, (strlen(path) + strlen(string) +
strlen("/tty") + 1));
if (newpath == NULL) {
fprintf(stderr, "realloc error\n");
goto out;
}
path = newpath;
strcat(path, string);
strcat(path, "/tty");
if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
fprintf(stderr, "xs_write for '%s' fail", string);
goto out;
}
ret = 0;
out:
free(path);
xs_close(xs);
return ret;
}
void xenstore_store_pv_console_info(int i, CharDriverState *chr)
{
if (i == 0) {
store_dev_info(xen_domid, chr, "/console");
} else {
char buf[32];
snprintf(buf, sizeof(buf), "/device/console/%d", i);
store_dev_info(xen_domid, chr, buf);
}
}
static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
{
char path[50];
if (xs == NULL) {
fprintf(stderr, "xenstore connection not initialized\n");
exit(1);
}
snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", xen_domid);
if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
fprintf(stderr, "error recording dm state\n");
exit(1);
}
}
static void xen_main_loop_prepare(XenIOState *state)
{
int evtchn_fd = -1;
if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
evtchn_fd = xc_evtchn_fd(state->xce_handle);
}
state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io,
state);
if (evtchn_fd != -1) {
qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
}
}
/* Initialise Xen */
static void xen_change_state_handler(void *opaque, int running,
RunState state)
{
if (running) {
/* record state running */
xenstore_record_dm_state(xenstore, "running");
}
}
static void xen_hvm_change_state_handler(void *opaque, int running,
RunState rstate)
{
XenIOState *xstate = opaque;
if (running) {
xen_main_loop_prepare(xstate);
}
}
static void xen_exit_notifier(Notifier *n, void *data)
{
XenIOState *state = container_of(n, XenIOState, exit);
xc_evtchn_close(state->xce_handle);
xs_daemon_close(state->xenstore);
}
int xen_init(void)
{
xen_xc = xen_xc_interface_open(0, 0, 0);
if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
xen_be_printf(NULL, 0, "can't open xen interface\n");
return -1;
}
qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
return 0;
}
static void xen_read_physmap(XenIOState *state)
{
XenPhysmap *physmap = NULL;
unsigned int len, num, i;
char path[80], *value = NULL;
char **entries = NULL;
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap", xen_domid);
entries = xs_directory(state->xenstore, 0, path, &num);
if (entries == NULL)
return;
for (i = 0; i < num; i++) {
physmap = g_malloc(sizeof (XenPhysmap));
physmap->phys_offset = strtoull(entries[i], NULL, 16);
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap/%s/start_addr",
xen_domid, entries[i]);
value = xs_read(state->xenstore, 0, path, &len);
if (value == NULL) {
g_free(physmap);
continue;
}
physmap->start_addr = strtoull(value, NULL, 16);
free(value);
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap/%s/size",
xen_domid, entries[i]);
value = xs_read(state->xenstore, 0, path, &len);
if (value == NULL) {
g_free(physmap);
continue;
}
physmap->size = strtoull(value, NULL, 16);
free(value);
snprintf(path, sizeof(path),
"/local/domain/0/device-model/%d/physmap/%s/name",
xen_domid, entries[i]);
physmap->name = xs_read(state->xenstore, 0, path, &len);
QLIST_INSERT_HEAD(&state->physmap, physmap, list);
}
free(entries);
}
int xen_hvm_init(void)
{
int i, rc;
unsigned long ioreq_pfn;
unsigned long bufioreq_evtchn;
XenIOState *state;
state = g_malloc0(sizeof (XenIOState));
state->xce_handle = xen_xc_evtchn_open(NULL, 0);
if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
perror("xen: event channel open");
g_free(state);
return -errno;
}
state->xenstore = xs_daemon_open();
if (state->xenstore == NULL) {
perror("xen: xenstore open");
g_free(state);
return -errno;
}
state->exit.notify = xen_exit_notifier;
qemu_add_exit_notifier(&state->exit);
state->suspend.notify = xen_suspend_notifier;
qemu_register_suspend_notifier(&state->suspend);
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
PROT_READ|PROT_WRITE, ioreq_pfn);
if (state->shared_page == NULL) {
hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
errno, xen_xc);
}
xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
PROT_READ|PROT_WRITE, ioreq_pfn);
if (state->buffered_io_page == NULL) {
hw_error("map buffered IO page returned error %d", errno);
}
state->ioreq_local_port = g_malloc0(smp_cpus * sizeof (evtchn_port_t));
/* FIXME: how about if we overflow the page here? */
for (i = 0; i < smp_cpus; i++) {
rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
xen_vcpu_eport(state->shared_page, i));
if (rc == -1) {
fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
return -1;
}
state->ioreq_local_port[i] = rc;
}
rc = xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_EVTCHN,
&bufioreq_evtchn);
if (rc < 0) {
fprintf(stderr, "failed to get HVM_PARAM_BUFIOREQ_EVTCHN\n");
return -1;
}
rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
(uint32_t)bufioreq_evtchn);
if (rc == -1) {
fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
return -1;
}
state->bufioreq_local_port = rc;
/* Init RAM management */
xen_map_cache_init(xen_phys_offset_to_gaddr, state);
xen_ram_init(ram_size);
qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
state->memory_listener = xen_memory_listener;
QLIST_INIT(&state->physmap);
memory_listener_register(&state->memory_listener, &address_space_memory);
state->log_for_dirtybit = NULL;
/* Initialize backend core & drivers */
if (xen_be_init() != 0) {
fprintf(stderr, "%s: xen backend core setup failed\n", __FUNCTION__);
exit(1);
}
xen_be_register("console", &xen_console_ops);
xen_be_register("vkbd", &xen_kbdmouse_ops);
xen_be_register("qdisk", &xen_blkdev_ops);
xen_read_physmap(state);
return 0;
}
void destroy_hvm_domain(bool reboot)
{
XenXC xc_handle;
int sts;
xc_handle = xen_xc_interface_open(0, 0, 0);
if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
fprintf(stderr, "Cannot acquire xenctrl handle\n");
} else {
sts = xc_domain_shutdown(xc_handle, xen_domid,
reboot ? SHUTDOWN_reboot : SHUTDOWN_poweroff);
if (sts != 0) {
fprintf(stderr, "xc_domain_shutdown failed to issue %s, "
"sts %d, %s\n", reboot ? "reboot" : "poweroff",
sts, strerror(errno));
} else {
fprintf(stderr, "Issued domain %d %s\n", xen_domid,
reboot ? "reboot" : "poweroff");
}
xc_interface_close(xc_handle);
}
}
void xen_register_framebuffer(MemoryRegion *mr)
{
framebuffer = mr;
}
void xen_shutdown_fatal_error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "Will destroy the domain.\n");
/* destroy the domain */
qemu_system_shutdown_request();
}
void xen_modified_memory(ram_addr_t start, ram_addr_t length)
{
if (unlikely(xen_in_migration)) {
int rc;
ram_addr_t start_pfn, nb_pages;
if (length == 0) {
length = TARGET_PAGE_SIZE;
}
start_pfn = start >> TARGET_PAGE_BITS;
nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
- start_pfn;
rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
if (rc) {
fprintf(stderr,
"%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n",
__func__, start, nb_pages, rc, strerror(-rc));
}
}
}
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