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-rw-r--r--hw/misc/vfio.c184
1 files changed, 122 insertions, 62 deletions
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index ede026d111..730dec511c 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -166,6 +166,7 @@ typedef struct VFIODevice {
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;
@@ -1058,6 +1059,125 @@ static const MemoryRegionOps vfio_bar_ops = {
.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) {
+ 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);
+ }
+
+ 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 const MemoryRegionOps vfio_rom_ops = {
+ .read = vfio_rom_read,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void vfio_pci_size_rom(VFIODevice *vdev)
+{
+ uint32_t orig, size = (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 = ~(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;
+}
+
static void vfio_vga_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
@@ -2638,51 +2758,6 @@ static int vfio_add_capabilities(VFIODevice *vdev)
return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
}
-static int vfio_load_rom(VFIODevice *vdev)
-{
- uint64_t size = vdev->rom_size;
- char name[32];
- off_t off = 0, voff = vdev->rom_offset;
- ssize_t bytes;
- void *ptr;
-
- /* If loading ROM from file, pci handles it */
- if (vdev->pdev.romfile || !vdev->pdev.rom_bar || !size) {
- return 0;
- }
-
- DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
- vdev->host.bus, vdev->host.slot, vdev->host.function);
-
- 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_ram(&vdev->pdev.rom, OBJECT(vdev), name, size);
- ptr = memory_region_get_ram_ptr(&vdev->pdev.rom);
- memset(ptr, 0xff, size);
-
- while (size) {
- bytes = pread(vdev->fd, ptr + off, size, voff + off);
- if (bytes == 0) {
- break; /* expect that we could get back less than the ROM BAR */
- } else if (bytes > 0) {
- off += bytes;
- size -= bytes;
- } else {
- if (errno == EINTR || errno == EAGAIN) {
- continue;
- }
- error_report("vfio: Error reading device ROM: %m");
- memory_region_destroy(&vdev->pdev.rom);
- return -errno;
- }
- }
-
- pci_register_bar(&vdev->pdev, PCI_ROM_SLOT, 0, &vdev->pdev.rom);
- vdev->pdev.has_rom = true;
- return 0;
-}
-
static int vfio_connect_container(VFIOGroup *group)
{
VFIOContainer *container;
@@ -2916,22 +2991,6 @@ static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
QLIST_INIT(&vdev->bars[i].quirks);
}
- reg_info.index = VFIO_PCI_ROM_REGION_INDEX;
-
- ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
- if (ret) {
- error_report("vfio: Error getting ROM info: %m");
- goto error;
- }
-
- DPRINTF("Device %s ROM:\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->rom_size = reg_info.size;
- vdev->rom_offset = reg_info.offset;
-
reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX;
ret = ioctl(vdev->fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
@@ -3229,7 +3288,7 @@ static int vfio_initfn(PCIDevice *pdev)
memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24);
memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4);
- vfio_load_rom(vdev);
+ vfio_pci_size_rom(vdev);
ret = vfio_early_setup_msix(vdev);
if (ret) {
@@ -3294,6 +3353,7 @@ static void vfio_exitfn(PCIDevice *pdev)
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);
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-29 12:01:40 +0000