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VFIO patches: realtek NIC quirk + SPAPR IOMMU AddressSpace support

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Merge remote-tracking branch 'remotes/awilliam/tags/vfio-pci-for-qemu-20140602.0' into staging

VFIO patches: realtek NIC quirk + SPAPR IOMMU AddressSpace support

# gpg: Signature made Mon 02 Jun 2014 22:44:42 BST using RSA key ID 3BB08B22
# gpg: Can't check signature: public key not found

* remotes/awilliam/tags/vfio-pci-for-qemu-20140602.0:
  vfio: Add guest side IOMMU support
  vfio: Create VFIOAddressSpace objects as needed
  vfio: Introduce VFIO address spaces
  vfio: Rework to have error paths
  vfio: Fix 128 bit handling
  int128: Add int128_exts64()
  memory: Sanity check that no listeners remain on a destroyed AddressSpace
  vfio-pci: Quirk RTL8168 NIC

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-06-03 14:37:43 +01:00
commit e00fcfeab3
3 changed files with 392 additions and 48 deletions
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426
hw/misc/vfio.c
View File

@ -133,6 +133,15 @@ enum {
VFIO_INT_MSIX = 3,
};
typedef struct VFIOAddressSpace {
AddressSpace *as;
QLIST_HEAD(, VFIOContainer) containers;
QLIST_ENTRY(VFIOAddressSpace) list;
} VFIOAddressSpace;
static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
QLIST_HEAD_INITIALIZER(vfio_address_spaces);
struct VFIOGroup;
typedef struct VFIOType1 {
@ -142,6 +151,7 @@ typedef struct VFIOType1 {
} VFIOType1;
typedef struct VFIOContainer {
VFIOAddressSpace *space;
int fd; /* /dev/vfio/vfio, empowered by the attached groups */
struct {
/* enable abstraction to support various iommu backends */
@ -150,10 +160,18 @@ typedef struct VFIOContainer {
};
void (*release)(struct VFIOContainer *);
} iommu_data;
QLIST_HEAD(, VFIOGuestIOMMU) giommu_list;
QLIST_HEAD(, VFIOGroup) group_list;
QLIST_ENTRY(VFIOContainer) next;
} VFIOContainer;
typedef struct VFIOGuestIOMMU {
VFIOContainer *container;
MemoryRegion *iommu;
Notifier n;
QLIST_ENTRY(VFIOGuestIOMMU) giommu_next;
} VFIOGuestIOMMU;
/* Cache of MSI-X setup plus extra mmap and memory region for split BAR map */
typedef struct VFIOMSIXInfo {
uint8_t table_bar;
@ -234,9 +252,6 @@ static const VFIORomBlacklistEntry romblacklist[] = {
#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);
@ -1668,6 +1683,149 @@ static void vfio_probe_ati_bar4_window_quirk(VFIODevice *vdev, int nr)
vdev->host.function);
}
#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
*/
static uint64_t vfio_rtl8168_window_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
switch (addr) {
case 4: /* address */
if (quirk->data.flags) {
DPRINTF("%s fake read(%04x:%02x:%02x.%d)\n",
memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
return quirk->data.address_match ^ 0x10000000U;
}
break;
case 0: /* data */
if (quirk->data.flags) {
uint64_t val;
DPRINTF("%s MSI-X table read(%04x:%02x:%02x.%d)\n",
memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
if (!(vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX)) {
return 0;
}
io_mem_read(&vdev->pdev.msix_table_mmio,
(hwaddr)(quirk->data.address_match & 0xfff),
&val, size);
return val;
}
}
DPRINTF("%s direct read(%04x:%02x:%02x.%d)\n",
memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
return vfio_bar_read(&vdev->bars[quirk->data.bar], addr + 0x70, size);
}
static void vfio_rtl8168_window_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOQuirk *quirk = opaque;
VFIODevice *vdev = quirk->vdev;
switch (addr) {
case 4: /* address */
if ((data & 0x7fff0000) == 0x10000) {
if (data & 0x10000000U &&
vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX) {
DPRINTF("%s MSI-X table write(%04x:%02x:%02x.%d)\n",
memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
io_mem_write(&vdev->pdev.msix_table_mmio,
(hwaddr)(quirk->data.address_match & 0xfff),
data, size);
}
quirk->data.flags = 1;
quirk->data.address_match = data;
return;
}
quirk->data.flags = 0;
break;
case 0: /* data */
quirk->data.address_mask = data;
break;
}
DPRINTF("%s direct write(%04x:%02x:%02x.%d)\n",
memory_region_name(&quirk->mem), vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
vfio_bar_write(&vdev->bars[quirk->data.bar], addr + 0x70, data, size);
}
static const MemoryRegionOps vfio_rtl8168_window_quirk = {
.read = vfio_rtl8168_window_quirk_read,
.write = vfio_rtl8168_window_quirk_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_rtl8168_bar2_window_quirk(VFIODevice *vdev, int nr)
{
PCIDevice *pdev = &vdev->pdev;
VFIOQuirk *quirk;
if (pci_get_word(pdev->config + PCI_VENDOR_ID) != PCI_VENDOR_ID_REALTEK ||
pci_get_word(pdev->config + PCI_DEVICE_ID) != 0x8168 || nr != 2) {
return;
}
quirk = g_malloc0(sizeof(*quirk));
quirk->vdev = vdev;
quirk->data.bar = nr;
memory_region_init_io(&quirk->mem, OBJECT(vdev), &vfio_rtl8168_window_quirk,
quirk, "vfio-rtl8168-window-quirk", 8);
memory_region_add_subregion_overlap(&vdev->bars[nr].mem,
0x70, &quirk->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
DPRINTF("Enabled RTL8168 BAR2 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.
*/
@ -2071,6 +2229,7 @@ static void vfio_bar_quirk_setup(VFIODevice *vdev, int 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);
vfio_probe_rtl8168_bar2_window_quirk(vdev, nr);
}
static void vfio_bar_quirk_teardown(VFIODevice *vdev, int nr)
@ -2232,7 +2391,8 @@ static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
static bool vfio_listener_skipped_section(MemoryRegionSection *section)
{
return !memory_region_is_ram(section->mr) ||
return (!memory_region_is_ram(section->mr) &&
!memory_region_is_iommu(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
@ -2242,17 +2402,75 @@ static bool vfio_listener_skipped_section(MemoryRegionSection *section)
section->offset_within_address_space & (1ULL << 63);
}
static void vfio_iommu_map_notify(Notifier *n, void *data)
{
VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
VFIOContainer *container = giommu->container;
IOMMUTLBEntry *iotlb = data;
MemoryRegion *mr;
hwaddr xlat;
hwaddr len = iotlb->addr_mask + 1;
void *vaddr;
int ret;
DPRINTF("iommu map @ %"HWADDR_PRIx" - %"HWADDR_PRIx"\n",
iotlb->iova, iotlb->iova + iotlb->addr_mask);
/*
* The IOMMU TLB entry we have just covers translation through
* this IOMMU to its immediate target. We need to translate
* it the rest of the way through to memory.
*/
mr = address_space_translate(&address_space_memory,
iotlb->translated_addr,
&xlat, &len, iotlb->perm & IOMMU_WO);
if (!memory_region_is_ram(mr)) {
DPRINTF("iommu map to non memory area %"HWADDR_PRIx"\n",
xlat);
return;
}
/*
* Translation truncates length to the IOMMU page size,
* check that it did not truncate too much.
*/
if (len & iotlb->addr_mask) {
DPRINTF("iommu has granularity incompatible with target AS\n");
return;
}
if (iotlb->perm != IOMMU_NONE) {
vaddr = memory_region_get_ram_ptr(mr) + xlat;
ret = vfio_dma_map(container, iotlb->iova,
iotlb->addr_mask + 1, vaddr,
!(iotlb->perm & IOMMU_WO) || mr->readonly);
if (ret) {
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx", %p) = %d (%m)",
container, iotlb->iova,
iotlb->addr_mask + 1, vaddr, ret);
}
} else {
ret = vfio_dma_unmap(container, iotlb->iova, iotlb->addr_mask + 1);
if (ret) {
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx") = %d (%m)",
container, iotlb->iova,
iotlb->addr_mask + 1, ret);
}
}
}
static void vfio_listener_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
VFIOContainer *container = container_of(listener, VFIOContainer,
iommu_data.type1.listener);
hwaddr iova, end;
Int128 llend;
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,
@ -2268,21 +2486,65 @@ static void vfio_listener_region_add(MemoryListener *listener,
}
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
end = (section->offset_within_address_space + int128_get64(section->size)) &
TARGET_PAGE_MASK;
llend = int128_make64(section->offset_within_address_space);
llend = int128_add(llend, section->size);
llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
if (iova >= end) {
if (int128_ge(int128_make64(iova), llend)) {
return;
}
memory_region_ref(section->mr);
if (memory_region_is_iommu(section->mr)) {
VFIOGuestIOMMU *giommu;
DPRINTF("region_add [iommu] %"HWADDR_PRIx" - %"HWADDR_PRIx"\n",
iova, int128_get64(int128_sub(llend, int128_one())));
/*
* FIXME: We should do some checking to see if the
* capabilities of the host VFIO IOMMU are adequate to model
* the guest IOMMU
*
* FIXME: For VFIO iommu types which have KVM acceleration to
* avoid bouncing all map/unmaps through qemu this way, this
* would be the right place to wire that up (tell the KVM
* device emulation the VFIO iommu handles to use).
*/
/*
* This assumes that the guest IOMMU is empty of
* mappings at this point.
*
* One way of doing this is:
* 1. Avoid sharing IOMMUs between emulated devices or different
* IOMMU groups.
* 2. Implement VFIO_IOMMU_ENABLE in the host kernel to fail if
* there are some mappings in IOMMU.
*
* VFIO on SPAPR does that. Other IOMMU models may do that different,
* they must make sure there are no existing mappings or
* loop through existing mappings to map them into VFIO.
*/
giommu = g_malloc0(sizeof(*giommu));
giommu->iommu = section->mr;
giommu->container = container;
giommu->n.notify = vfio_iommu_map_notify;
QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next);
memory_region_register_iommu_notifier(giommu->iommu, &giommu->n);
return;
}
/* Here we assume that memory_region_is_ram(section->mr)==true */
end = int128_get64(llend);
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",
DPRINTF("region_add [ram] %"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", "
@ -2326,6 +2588,27 @@ static void vfio_listener_region_del(MemoryListener *listener,
return;
}
if (memory_region_is_iommu(section->mr)) {
VFIOGuestIOMMU *giommu;
QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) {
if (giommu->iommu == section->mr) {
memory_region_unregister_iommu_notifier(&giommu->n);
QLIST_REMOVE(giommu, giommu_next);
g_free(giommu);
break;
}
}
/*
* FIXME: We assume the one big unmap below is adequate to
* remove any individual page mappings in the IOMMU which
* might have been copied into VFIO. This works for a page table
* based IOMMU where a big unmap flattens a large range of IO-PTEs.
* That may not be true for all IOMMU types.
*/
}
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
end = (section->offset_within_address_space + int128_get64(section->size)) &
TARGET_PAGE_MASK;
@ -3274,16 +3557,43 @@ static void vfio_kvm_device_del_group(VFIOGroup *group)
#endif
}
static int vfio_connect_container(VFIOGroup *group)
static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
{
VFIOAddressSpace *space;
QLIST_FOREACH(space, &vfio_address_spaces, list) {
if (space->as == as) {
return space;
}
}
/* No suitable VFIOAddressSpace, create a new one */
space = g_malloc0(sizeof(*space));
space->as = as;
QLIST_INIT(&space->containers);
QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
return space;
}
static void vfio_put_address_space(VFIOAddressSpace *space)
{
if (QLIST_EMPTY(&space->containers)) {
QLIST_REMOVE(space, list);
g_free(space);
}
}
static int vfio_connect_container(VFIOGroup *group, AddressSpace *as)
{
VFIOContainer *container;
int ret, fd;
VFIOAddressSpace *space;
if (group->container) {
return 0;
}
space = vfio_get_address_space(as);
QLIST_FOREACH(container, &container_list, next) {
QLIST_FOREACH(container, &space->containers, next) {
if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
group->container = container;
QLIST_INSERT_HEAD(&container->group_list, group, container_next);
@ -3294,35 +3604,35 @@ static int vfio_connect_container(VFIOGroup *group)
fd = qemu_open("/dev/vfio/vfio", O_RDWR);
if (fd < 0) {
error_report("vfio: failed to open /dev/vfio/vfio: %m");
return -errno;
ret = -errno;
goto put_space_exit;
}
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;
ret = -EINVAL;
goto close_fd_exit;
}
container = g_malloc0(sizeof(*container));
container->space = space;
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 = -errno;
goto free_container_exit;
}
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;
ret = -errno;
goto free_container_exit;
}
container->iommu_data.type1.listener = vfio_memory_listener;
@ -3333,29 +3643,39 @@ static int vfio_connect_container(VFIOGroup *group)
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");
return ret;
goto listener_release_exit;
}
container->iommu_data.type1.initialized = true;
} else {
error_report("vfio: No available IOMMU models");
g_free(container);
close(fd);
return -EINVAL;
ret = -EINVAL;
goto free_container_exit;
}
QLIST_INIT(&container->group_list);
QLIST_INSERT_HEAD(&container_list, container, next);
QLIST_INSERT_HEAD(&space->containers, container, next);
group->container = container;
QLIST_INSERT_HEAD(&container->group_list, group, container_next);
return 0;
listener_release_exit:
vfio_listener_release(container);
free_container_exit:
g_free(container);
close_fd_exit:
close(fd);
put_space_exit:
vfio_put_address_space(space);
return ret;
}
static void vfio_disconnect_container(VFIOGroup *group)
@ -3371,6 +3691,8 @@ static void vfio_disconnect_container(VFIOGroup *group)
group->container = NULL;
if (QLIST_EMPTY(&container->group_list)) {
VFIOAddressSpace *space = container->space;
if (container->iommu_data.release) {
container->iommu_data.release(container);
}
@ -3378,10 +3700,12 @@ static void vfio_disconnect_container(VFIOGroup *group)
DPRINTF("vfio_disconnect_container: close container->fd\n");
close(container->fd);
g_free(container);
vfio_put_address_space(space);
}
}
static VFIOGroup *vfio_get_group(int groupid)
static VFIOGroup *vfio_get_group(int groupid, AddressSpace *as)
{
VFIOGroup *group;
char path[32];
@ -3389,7 +3713,14 @@ static VFIOGroup *vfio_get_group(int groupid)
QLIST_FOREACH(group, &group_list, next) {
if (group->groupid == groupid) {
/* Found it. Now is it already in the right context? */
if (group->container->space->as == as) {
return group;
} else {
error_report("vfio: group %d used in multiple address spaces",
group->groupid);
return NULL;
}
}
}
@ -3399,34 +3730,27 @@ static VFIOGroup *vfio_get_group(int 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;
goto free_group_exit;
}
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;
goto close_fd_exit;
}
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;
goto close_fd_exit;
}
group->groupid = groupid;
QLIST_INIT(&group->device_list);
if (vfio_connect_container(group)) {
if (vfio_connect_container(group, as)) {
error_report("vfio: failed to setup container for group %d", groupid);
close(group->fd);
g_free(group);
return NULL;
goto close_fd_exit;
}
if (QLIST_EMPTY(&group_list)) {
@ -3438,6 +3762,14 @@ static VFIOGroup *vfio_get_group(int groupid)
vfio_kvm_device_add_group(group);
return group;
close_fd_exit:
close(group->fd);
free_group_exit:
g_free(group);
return NULL;
}
static void vfio_put_group(VFIOGroup *group)
@ -3768,7 +4100,7 @@ static int vfio_initfn(PCIDevice *pdev)
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);
group = vfio_get_group(groupid, pci_device_iommu_address_space(pdev));
if (!group) {
error_report("vfio: failed to get group %d", groupid);
return -ENOENT;

5
include/qemu/int128.h
View File

@ -38,6 +38,11 @@ static inline Int128 int128_2_64(void)
return (Int128) { 0, 1 };
}
static inline Int128 int128_exts64(int64_t a)
{
return (Int128) { .lo = a, .hi = (a < 0) ? -1 : 0 };
}
static inline Int128 int128_and(Int128 a, Int128 b)
{
return (Int128) { a.lo & b.lo, a.hi & b.hi };

7
memory.c
View File

@ -1722,12 +1722,19 @@ void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name)
void address_space_destroy(AddressSpace *as)
{
MemoryListener *listener;
/* Flush out anything from MemoryListeners listening in on this */
memory_region_transaction_begin();
as->root = NULL;
memory_region_transaction_commit();
QTAILQ_REMOVE(&address_spaces, as, address_spaces_link);
address_space_destroy_dispatch(as);
QTAILQ_FOREACH(listener, &memory_listeners, link) {
assert(listener->address_space_filter != as);
}
flatview_unref(as->current_map);
g_free(as->name);
g_free(as->ioeventfds);