mirror of https://github.com/proxmox/mirror_qemu
1196 lines
35 KiB
C
1196 lines
35 KiB
C
/*
|
|
* generic functions used by VFIO devices
|
|
*
|
|
* Copyright Red Hat, Inc. 2012
|
|
*
|
|
* Authors:
|
|
* Alex Williamson <alex.williamson@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
* Based on qemu-kvm device-assignment:
|
|
* Adapted for KVM by Qumranet.
|
|
* Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
|
|
* Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
|
|
* Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
|
|
* Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
|
|
* Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <linux/vfio.h>
|
|
|
|
#include "hw/vfio/vfio-common.h"
|
|
#include "hw/vfio/vfio.h"
|
|
#include "exec/address-spaces.h"
|
|
#include "exec/memory.h"
|
|
#include "hw/hw.h"
|
|
#include "qemu/error-report.h"
|
|
#include "sysemu/kvm.h"
|
|
#ifdef CONFIG_KVM
|
|
#include "linux/kvm.h"
|
|
#endif
|
|
#include "trace.h"
|
|
|
|
struct vfio_group_head vfio_group_list =
|
|
QLIST_HEAD_INITIALIZER(vfio_group_list);
|
|
struct vfio_as_head vfio_address_spaces =
|
|
QLIST_HEAD_INITIALIZER(vfio_address_spaces);
|
|
|
|
#ifdef CONFIG_KVM
|
|
/*
|
|
* We have a single VFIO pseudo device per KVM VM. Once created it lives
|
|
* for the life of the VM. Closing the file descriptor only drops our
|
|
* reference to it and the device's reference to kvm. Therefore once
|
|
* initialized, this file descriptor is only released on QEMU exit and
|
|
* we'll re-use it should another vfio device be attached before then.
|
|
*/
|
|
static int vfio_kvm_device_fd = -1;
|
|
#endif
|
|
|
|
/*
|
|
* Common VFIO interrupt disable
|
|
*/
|
|
void vfio_disable_irqindex(VFIODevice *vbasedev, int index)
|
|
{
|
|
struct vfio_irq_set irq_set = {
|
|
.argsz = sizeof(irq_set),
|
|
.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_TRIGGER,
|
|
.index = index,
|
|
.start = 0,
|
|
.count = 0,
|
|
};
|
|
|
|
ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
|
|
}
|
|
|
|
void vfio_unmask_single_irqindex(VFIODevice *vbasedev, int index)
|
|
{
|
|
struct vfio_irq_set irq_set = {
|
|
.argsz = sizeof(irq_set),
|
|
.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
|
|
.index = index,
|
|
.start = 0,
|
|
.count = 1,
|
|
};
|
|
|
|
ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
|
|
}
|
|
|
|
void vfio_mask_single_irqindex(VFIODevice *vbasedev, int index)
|
|
{
|
|
struct vfio_irq_set irq_set = {
|
|
.argsz = sizeof(irq_set),
|
|
.flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_MASK,
|
|
.index = index,
|
|
.start = 0,
|
|
.count = 1,
|
|
};
|
|
|
|
ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, &irq_set);
|
|
}
|
|
|
|
/*
|
|
* IO Port/MMIO - Beware of the endians, VFIO is always little endian
|
|
*/
|
|
void vfio_region_write(void *opaque, hwaddr addr,
|
|
uint64_t data, unsigned size)
|
|
{
|
|
VFIORegion *region = opaque;
|
|
VFIODevice *vbasedev = region->vbasedev;
|
|
union {
|
|
uint8_t byte;
|
|
uint16_t word;
|
|
uint32_t dword;
|
|
uint64_t qword;
|
|
} buf;
|
|
|
|
switch (size) {
|
|
case 1:
|
|
buf.byte = data;
|
|
break;
|
|
case 2:
|
|
buf.word = cpu_to_le16(data);
|
|
break;
|
|
case 4:
|
|
buf.dword = cpu_to_le32(data);
|
|
break;
|
|
default:
|
|
hw_error("vfio: unsupported write size, %d bytes", size);
|
|
break;
|
|
}
|
|
|
|
if (pwrite(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
|
|
error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
|
|
",%d) failed: %m",
|
|
__func__, vbasedev->name, region->nr,
|
|
addr, data, size);
|
|
}
|
|
|
|
trace_vfio_region_write(vbasedev->name, region->nr, addr, data, size);
|
|
|
|
/*
|
|
* A read or write to a BAR always signals an INTx EOI. This will
|
|
* do nothing if not pending (including not in INTx mode). We assume
|
|
* that a BAR access is in response to an interrupt and that BAR
|
|
* accesses will service the interrupt. Unfortunately, we don't know
|
|
* which access will service the interrupt, so we're potentially
|
|
* getting quite a few host interrupts per guest interrupt.
|
|
*/
|
|
vbasedev->ops->vfio_eoi(vbasedev);
|
|
}
|
|
|
|
uint64_t vfio_region_read(void *opaque,
|
|
hwaddr addr, unsigned size)
|
|
{
|
|
VFIORegion *region = opaque;
|
|
VFIODevice *vbasedev = region->vbasedev;
|
|
union {
|
|
uint8_t byte;
|
|
uint16_t word;
|
|
uint32_t dword;
|
|
uint64_t qword;
|
|
} buf;
|
|
uint64_t data = 0;
|
|
|
|
if (pread(vbasedev->fd, &buf, size, region->fd_offset + addr) != size) {
|
|
error_report("%s(%s:region%d+0x%"HWADDR_PRIx", %d) failed: %m",
|
|
__func__, vbasedev->name, region->nr,
|
|
addr, size);
|
|
return (uint64_t)-1;
|
|
}
|
|
switch (size) {
|
|
case 1:
|
|
data = buf.byte;
|
|
break;
|
|
case 2:
|
|
data = le16_to_cpu(buf.word);
|
|
break;
|
|
case 4:
|
|
data = le32_to_cpu(buf.dword);
|
|
break;
|
|
default:
|
|
hw_error("vfio: unsupported read size, %d bytes", size);
|
|
break;
|
|
}
|
|
|
|
trace_vfio_region_read(vbasedev->name, region->nr, addr, size, data);
|
|
|
|
/* Same as write above */
|
|
vbasedev->ops->vfio_eoi(vbasedev);
|
|
|
|
return data;
|
|
}
|
|
|
|
const MemoryRegionOps vfio_region_ops = {
|
|
.read = vfio_region_read,
|
|
.write = vfio_region_write,
|
|
.endianness = DEVICE_LITTLE_ENDIAN,
|
|
};
|
|
|
|
/*
|
|
* DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
|
|
*/
|
|
static int vfio_dma_unmap(VFIOContainer *container,
|
|
hwaddr iova, ram_addr_t size)
|
|
{
|
|
struct vfio_iommu_type1_dma_unmap unmap = {
|
|
.argsz = sizeof(unmap),
|
|
.flags = 0,
|
|
.iova = iova,
|
|
.size = size,
|
|
};
|
|
|
|
if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
|
|
error_report("VFIO_UNMAP_DMA: %d", -errno);
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
|
|
ram_addr_t size, void *vaddr, bool readonly)
|
|
{
|
|
struct vfio_iommu_type1_dma_map map = {
|
|
.argsz = sizeof(map),
|
|
.flags = VFIO_DMA_MAP_FLAG_READ,
|
|
.vaddr = (__u64)(uintptr_t)vaddr,
|
|
.iova = iova,
|
|
.size = size,
|
|
};
|
|
|
|
if (!readonly) {
|
|
map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
|
|
}
|
|
|
|
/*
|
|
* Try the mapping, if it fails with EBUSY, unmap the region and try
|
|
* again. This shouldn't be necessary, but we sometimes see it in
|
|
* the VGA ROM space.
|
|
*/
|
|
if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
|
|
(errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
|
|
ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
|
|
return 0;
|
|
}
|
|
|
|
error_report("VFIO_MAP_DMA: %d", -errno);
|
|
return -errno;
|
|
}
|
|
|
|
static bool vfio_listener_skipped_section(MemoryRegionSection *section)
|
|
{
|
|
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
|
|
* are never accessed by the CPU and beyond the address width of
|
|
* some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
|
|
*/
|
|
section->offset_within_address_space & (1ULL << 63);
|
|
}
|
|
|
|
static void vfio_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;
|
|
|
|
trace_vfio_iommu_map_notify(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.
|
|
*/
|
|
rcu_read_lock();
|
|
mr = address_space_translate(&address_space_memory,
|
|
iotlb->translated_addr,
|
|
&xlat, &len, iotlb->perm & IOMMU_WO);
|
|
if (!memory_region_is_ram(mr)) {
|
|
error_report("iommu map to non memory area %"HWADDR_PRIx"",
|
|
xlat);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Translation truncates length to the IOMMU page size,
|
|
* check that it did not truncate too much.
|
|
*/
|
|
if (len & iotlb->addr_mask) {
|
|
error_report("iommu has granularity incompatible with target AS");
|
|
goto out;
|
|
}
|
|
|
|
if ((iotlb->perm & IOMMU_RW) != 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);
|
|
}
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static hwaddr vfio_container_granularity(VFIOContainer *container)
|
|
{
|
|
return (hwaddr)1 << ctz64(container->iova_pgsizes);
|
|
}
|
|
|
|
static void vfio_listener_region_add(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
|
|
hwaddr iova, end;
|
|
Int128 llend, llsize;
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
if (vfio_listener_skipped_section(section)) {
|
|
trace_vfio_listener_region_add_skip(
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(int128_sub(section->size, int128_one())));
|
|
return;
|
|
}
|
|
|
|
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
|
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
|
|
error_report("%s received unaligned region", __func__);
|
|
return;
|
|
}
|
|
|
|
iova = TARGET_PAGE_ALIGN(section->offset_within_address_space);
|
|
llend = int128_make64(section->offset_within_address_space);
|
|
llend = int128_add(llend, section->size);
|
|
llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK));
|
|
|
|
if (int128_ge(int128_make64(iova), llend)) {
|
|
return;
|
|
}
|
|
end = int128_get64(int128_sub(llend, int128_one()));
|
|
|
|
if ((iova < container->min_iova) || (end > container->max_iova)) {
|
|
error_report("vfio: IOMMU container %p can't map guest IOVA region"
|
|
" 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx,
|
|
container, iova, end);
|
|
ret = -EFAULT;
|
|
goto fail;
|
|
}
|
|
|
|
memory_region_ref(section->mr);
|
|
|
|
if (memory_region_is_iommu(section->mr)) {
|
|
VFIOGuestIOMMU *giommu;
|
|
|
|
trace_vfio_listener_region_add_iommu(iova, end);
|
|
/*
|
|
* 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).
|
|
*/
|
|
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);
|
|
memory_region_iommu_replay(giommu->iommu, &giommu->n,
|
|
vfio_container_granularity(container),
|
|
false);
|
|
|
|
return;
|
|
}
|
|
|
|
/* Here we assume that memory_region_is_ram(section->mr)==true */
|
|
|
|
vaddr = memory_region_get_ram_ptr(section->mr) +
|
|
section->offset_within_region +
|
|
(iova - section->offset_within_address_space);
|
|
|
|
trace_vfio_listener_region_add_ram(iova, end, vaddr);
|
|
|
|
llsize = int128_sub(llend, int128_make64(iova));
|
|
|
|
ret = vfio_dma_map(container, iova, int128_get64(llsize),
|
|
vaddr, section->readonly);
|
|
if (ret) {
|
|
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx", %p) = %d (%m)",
|
|
container, iova, int128_get64(llsize), vaddr, ret);
|
|
goto fail;
|
|
}
|
|
|
|
return;
|
|
|
|
fail:
|
|
/*
|
|
* On the initfn path, store the first error in the container so we
|
|
* can gracefully fail. Runtime, there's not much we can do other
|
|
* than throw a hardware error.
|
|
*/
|
|
if (!container->initialized) {
|
|
if (!container->error) {
|
|
container->error = ret;
|
|
}
|
|
} else {
|
|
hw_error("vfio: DMA mapping failed, unable to continue");
|
|
}
|
|
}
|
|
|
|
static void vfio_listener_region_del(MemoryListener *listener,
|
|
MemoryRegionSection *section)
|
|
{
|
|
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
|
|
hwaddr iova, end;
|
|
int ret;
|
|
|
|
if (vfio_listener_skipped_section(section)) {
|
|
trace_vfio_listener_region_del_skip(
|
|
section->offset_within_address_space,
|
|
section->offset_within_address_space +
|
|
int128_get64(int128_sub(section->size, int128_one())));
|
|
return;
|
|
}
|
|
|
|
if (unlikely((section->offset_within_address_space & ~TARGET_PAGE_MASK) !=
|
|
(section->offset_within_region & ~TARGET_PAGE_MASK))) {
|
|
error_report("%s received unaligned region", __func__);
|
|
return;
|
|
}
|
|
|
|
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;
|
|
|
|
if (iova >= end) {
|
|
return;
|
|
}
|
|
|
|
trace_vfio_listener_region_del(iova, end - 1);
|
|
|
|
ret = vfio_dma_unmap(container, iova, end - iova);
|
|
memory_region_unref(section->mr);
|
|
if (ret) {
|
|
error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", "
|
|
"0x%"HWADDR_PRIx") = %d (%m)",
|
|
container, iova, end - iova, ret);
|
|
}
|
|
}
|
|
|
|
static const MemoryListener vfio_memory_listener = {
|
|
.region_add = vfio_listener_region_add,
|
|
.region_del = vfio_listener_region_del,
|
|
};
|
|
|
|
static void vfio_listener_release(VFIOContainer *container)
|
|
{
|
|
memory_listener_unregister(&container->listener);
|
|
}
|
|
|
|
int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
|
|
int index, const char *name)
|
|
{
|
|
struct vfio_region_info *info;
|
|
int ret;
|
|
|
|
ret = vfio_get_region_info(vbasedev, index, &info);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
region->vbasedev = vbasedev;
|
|
region->flags = info->flags;
|
|
region->size = info->size;
|
|
region->fd_offset = info->offset;
|
|
region->nr = index;
|
|
|
|
if (region->size) {
|
|
region->mem = g_new0(MemoryRegion, 1);
|
|
memory_region_init_io(region->mem, obj, &vfio_region_ops,
|
|
region, name, region->size);
|
|
|
|
if (!vbasedev->no_mmap &&
|
|
region->flags & VFIO_REGION_INFO_FLAG_MMAP &&
|
|
!(region->size & ~qemu_real_host_page_mask)) {
|
|
|
|
region->nr_mmaps = 1;
|
|
region->mmaps = g_new0(VFIOMmap, region->nr_mmaps);
|
|
|
|
region->mmaps[0].offset = 0;
|
|
region->mmaps[0].size = region->size;
|
|
}
|
|
}
|
|
|
|
g_free(info);
|
|
|
|
trace_vfio_region_setup(vbasedev->name, index, name,
|
|
region->flags, region->fd_offset, region->size);
|
|
return 0;
|
|
}
|
|
|
|
int vfio_region_mmap(VFIORegion *region)
|
|
{
|
|
int i, prot = 0;
|
|
char *name;
|
|
|
|
if (!region->mem) {
|
|
return 0;
|
|
}
|
|
|
|
prot |= region->flags & VFIO_REGION_INFO_FLAG_READ ? PROT_READ : 0;
|
|
prot |= region->flags & VFIO_REGION_INFO_FLAG_WRITE ? PROT_WRITE : 0;
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
region->mmaps[i].mmap = mmap(NULL, region->mmaps[i].size, prot,
|
|
MAP_SHARED, region->vbasedev->fd,
|
|
region->fd_offset +
|
|
region->mmaps[i].offset);
|
|
if (region->mmaps[i].mmap == MAP_FAILED) {
|
|
int ret = -errno;
|
|
|
|
trace_vfio_region_mmap_fault(memory_region_name(region->mem), i,
|
|
region->fd_offset +
|
|
region->mmaps[i].offset,
|
|
region->fd_offset +
|
|
region->mmaps[i].offset +
|
|
region->mmaps[i].size - 1, ret);
|
|
|
|
region->mmaps[i].mmap = NULL;
|
|
|
|
for (i--; i >= 0; i--) {
|
|
memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem);
|
|
munmap(region->mmaps[i].mmap, region->mmaps[i].size);
|
|
object_unparent(OBJECT(®ion->mmaps[i].mem));
|
|
region->mmaps[i].mmap = NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
name = g_strdup_printf("%s mmaps[%d]",
|
|
memory_region_name(region->mem), i);
|
|
memory_region_init_ram_ptr(®ion->mmaps[i].mem,
|
|
memory_region_owner(region->mem),
|
|
name, region->mmaps[i].size,
|
|
region->mmaps[i].mmap);
|
|
g_free(name);
|
|
memory_region_set_skip_dump(®ion->mmaps[i].mem);
|
|
memory_region_add_subregion(region->mem, region->mmaps[i].offset,
|
|
®ion->mmaps[i].mem);
|
|
|
|
trace_vfio_region_mmap(memory_region_name(®ion->mmaps[i].mem),
|
|
region->mmaps[i].offset,
|
|
region->mmaps[i].offset +
|
|
region->mmaps[i].size - 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void vfio_region_exit(VFIORegion *region)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
memory_region_del_subregion(region->mem, ®ion->mmaps[i].mem);
|
|
}
|
|
}
|
|
|
|
trace_vfio_region_exit(region->vbasedev->name, region->nr);
|
|
}
|
|
|
|
void vfio_region_finalize(VFIORegion *region)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
munmap(region->mmaps[i].mmap, region->mmaps[i].size);
|
|
object_unparent(OBJECT(®ion->mmaps[i].mem));
|
|
}
|
|
}
|
|
|
|
object_unparent(OBJECT(region->mem));
|
|
|
|
g_free(region->mem);
|
|
g_free(region->mmaps);
|
|
|
|
trace_vfio_region_finalize(region->vbasedev->name, region->nr);
|
|
}
|
|
|
|
void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled)
|
|
{
|
|
int i;
|
|
|
|
if (!region->mem) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < region->nr_mmaps; i++) {
|
|
if (region->mmaps[i].mmap) {
|
|
memory_region_set_enabled(®ion->mmaps[i].mem, enabled);
|
|
}
|
|
}
|
|
|
|
trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem),
|
|
enabled);
|
|
}
|
|
|
|
void vfio_reset_handler(void *opaque)
|
|
{
|
|
VFIOGroup *group;
|
|
VFIODevice *vbasedev;
|
|
|
|
QLIST_FOREACH(group, &vfio_group_list, next) {
|
|
QLIST_FOREACH(vbasedev, &group->device_list, next) {
|
|
vbasedev->ops->vfio_compute_needs_reset(vbasedev);
|
|
}
|
|
}
|
|
|
|
QLIST_FOREACH(group, &vfio_group_list, next) {
|
|
QLIST_FOREACH(vbasedev, &group->device_list, next) {
|
|
if (vbasedev->needs_reset) {
|
|
vbasedev->ops->vfio_hot_reset_multi(vbasedev);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vfio_kvm_device_add_group(VFIOGroup *group)
|
|
{
|
|
#ifdef CONFIG_KVM
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_GROUP,
|
|
.attr = KVM_DEV_VFIO_GROUP_ADD,
|
|
.addr = (uint64_t)(unsigned long)&group->fd,
|
|
};
|
|
|
|
if (!kvm_enabled()) {
|
|
return;
|
|
}
|
|
|
|
if (vfio_kvm_device_fd < 0) {
|
|
struct kvm_create_device cd = {
|
|
.type = KVM_DEV_TYPE_VFIO,
|
|
};
|
|
|
|
if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
|
|
error_report("Failed to create KVM VFIO device: %m");
|
|
return;
|
|
}
|
|
|
|
vfio_kvm_device_fd = cd.fd;
|
|
}
|
|
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_report("Failed to add group %d to KVM VFIO device: %m",
|
|
group->groupid);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void vfio_kvm_device_del_group(VFIOGroup *group)
|
|
{
|
|
#ifdef CONFIG_KVM
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_VFIO_GROUP,
|
|
.attr = KVM_DEV_VFIO_GROUP_DEL,
|
|
.addr = (uint64_t)(unsigned long)&group->fd,
|
|
};
|
|
|
|
if (vfio_kvm_device_fd < 0) {
|
|
return;
|
|
}
|
|
|
|
if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
|
|
error_report("Failed to remove group %d from KVM VFIO device: %m",
|
|
group->groupid);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
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;
|
|
|
|
space = vfio_get_address_space(as);
|
|
|
|
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);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
fd = qemu_open("/dev/vfio/vfio", O_RDWR);
|
|
if (fd < 0) {
|
|
error_report("vfio: failed to open /dev/vfio/vfio: %m");
|
|
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);
|
|
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) ||
|
|
ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) {
|
|
bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU);
|
|
struct vfio_iommu_type1_info info;
|
|
|
|
ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
|
|
if (ret) {
|
|
error_report("vfio: failed to set group container: %m");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
|
|
ret = ioctl(fd, VFIO_SET_IOMMU,
|
|
v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU);
|
|
if (ret) {
|
|
error_report("vfio: failed to set iommu for container: %m");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
|
|
/*
|
|
* FIXME: This assumes that a Type1 IOMMU can map any 64-bit
|
|
* IOVA whatsoever. That's not actually true, but the current
|
|
* kernel interface doesn't tell us what it can map, and the
|
|
* existing Type1 IOMMUs generally support any IOVA we're
|
|
* going to actually try in practice.
|
|
*/
|
|
container->min_iova = 0;
|
|
container->max_iova = (hwaddr)-1;
|
|
|
|
/* Assume just 4K IOVA page size */
|
|
container->iova_pgsizes = 0x1000;
|
|
info.argsz = sizeof(info);
|
|
ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info);
|
|
/* Ignore errors */
|
|
if ((ret == 0) && (info.flags & VFIO_IOMMU_INFO_PGSIZES)) {
|
|
container->iova_pgsizes = info.iova_pgsizes;
|
|
}
|
|
} else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU)) {
|
|
struct vfio_iommu_spapr_tce_info info;
|
|
|
|
ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
|
|
if (ret) {
|
|
error_report("vfio: failed to set group container: %m");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_SPAPR_TCE_IOMMU);
|
|
if (ret) {
|
|
error_report("vfio: failed to set iommu for container: %m");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
|
|
/*
|
|
* The host kernel code implementing VFIO_IOMMU_DISABLE is called
|
|
* when container fd is closed so we do not call it explicitly
|
|
* in this file.
|
|
*/
|
|
ret = ioctl(fd, VFIO_IOMMU_ENABLE);
|
|
if (ret) {
|
|
error_report("vfio: failed to enable container: %m");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
|
|
/*
|
|
* This only considers the host IOMMU's 32-bit window. At
|
|
* some point we need to add support for the optional 64-bit
|
|
* window and dynamic windows
|
|
*/
|
|
info.argsz = sizeof(info);
|
|
ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
|
|
if (ret) {
|
|
error_report("vfio: VFIO_IOMMU_SPAPR_TCE_GET_INFO failed: %m");
|
|
ret = -errno;
|
|
goto free_container_exit;
|
|
}
|
|
container->min_iova = info.dma32_window_start;
|
|
container->max_iova = container->min_iova + info.dma32_window_size - 1;
|
|
|
|
/* Assume just 4K IOVA pages for now */
|
|
container->iova_pgsizes = 0x1000;
|
|
} else {
|
|
error_report("vfio: No available IOMMU models");
|
|
ret = -EINVAL;
|
|
goto free_container_exit;
|
|
}
|
|
|
|
container->listener = vfio_memory_listener;
|
|
|
|
memory_listener_register(&container->listener, container->space->as);
|
|
|
|
if (container->error) {
|
|
ret = container->error;
|
|
error_report("vfio: memory listener initialization failed for container");
|
|
goto listener_release_exit;
|
|
}
|
|
|
|
container->initialized = true;
|
|
|
|
QLIST_INIT(&container->group_list);
|
|
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)
|
|
{
|
|
VFIOContainer *container = group->container;
|
|
|
|
if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
|
|
error_report("vfio: error disconnecting group %d from container",
|
|
group->groupid);
|
|
}
|
|
|
|
QLIST_REMOVE(group, container_next);
|
|
group->container = NULL;
|
|
|
|
if (QLIST_EMPTY(&container->group_list)) {
|
|
VFIOAddressSpace *space = container->space;
|
|
VFIOGuestIOMMU *giommu, *tmp;
|
|
|
|
vfio_listener_release(container);
|
|
QLIST_REMOVE(container, next);
|
|
|
|
QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
|
|
memory_region_unregister_iommu_notifier(&giommu->n);
|
|
QLIST_REMOVE(giommu, giommu_next);
|
|
g_free(giommu);
|
|
}
|
|
|
|
trace_vfio_disconnect_container(container->fd);
|
|
close(container->fd);
|
|
g_free(container);
|
|
|
|
vfio_put_address_space(space);
|
|
}
|
|
}
|
|
|
|
VFIOGroup *vfio_get_group(int groupid, AddressSpace *as)
|
|
{
|
|
VFIOGroup *group;
|
|
char path[32];
|
|
struct vfio_group_status status = { .argsz = sizeof(status) };
|
|
|
|
QLIST_FOREACH(group, &vfio_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;
|
|
}
|
|
}
|
|
}
|
|
|
|
group = g_malloc0(sizeof(*group));
|
|
|
|
snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
|
|
group->fd = qemu_open(path, O_RDWR);
|
|
if (group->fd < 0) {
|
|
error_report("vfio: error opening %s: %m", path);
|
|
goto free_group_exit;
|
|
}
|
|
|
|
if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
|
|
error_report("vfio: error getting group status: %m");
|
|
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);
|
|
goto close_fd_exit;
|
|
}
|
|
|
|
group->groupid = groupid;
|
|
QLIST_INIT(&group->device_list);
|
|
|
|
if (vfio_connect_container(group, as)) {
|
|
error_report("vfio: failed to setup container for group %d", groupid);
|
|
goto close_fd_exit;
|
|
}
|
|
|
|
if (QLIST_EMPTY(&vfio_group_list)) {
|
|
qemu_register_reset(vfio_reset_handler, NULL);
|
|
}
|
|
|
|
QLIST_INSERT_HEAD(&vfio_group_list, group, next);
|
|
|
|
vfio_kvm_device_add_group(group);
|
|
|
|
return group;
|
|
|
|
close_fd_exit:
|
|
close(group->fd);
|
|
|
|
free_group_exit:
|
|
g_free(group);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void vfio_put_group(VFIOGroup *group)
|
|
{
|
|
if (!group || !QLIST_EMPTY(&group->device_list)) {
|
|
return;
|
|
}
|
|
|
|
vfio_kvm_device_del_group(group);
|
|
vfio_disconnect_container(group);
|
|
QLIST_REMOVE(group, next);
|
|
trace_vfio_put_group(group->fd);
|
|
close(group->fd);
|
|
g_free(group);
|
|
|
|
if (QLIST_EMPTY(&vfio_group_list)) {
|
|
qemu_unregister_reset(vfio_reset_handler, NULL);
|
|
}
|
|
}
|
|
|
|
int vfio_get_device(VFIOGroup *group, const char *name,
|
|
VFIODevice *vbasedev)
|
|
{
|
|
struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
|
|
int ret, fd;
|
|
|
|
fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
|
|
if (fd < 0) {
|
|
error_report("vfio: error getting device %s from group %d: %m",
|
|
name, group->groupid);
|
|
error_printf("Verify all devices in group %d are bound to vfio-<bus> "
|
|
"or pci-stub and not already in use\n", group->groupid);
|
|
return fd;
|
|
}
|
|
|
|
ret = ioctl(fd, VFIO_DEVICE_GET_INFO, &dev_info);
|
|
if (ret) {
|
|
error_report("vfio: error getting device info: %m");
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
vbasedev->fd = fd;
|
|
vbasedev->group = group;
|
|
QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
|
|
|
|
vbasedev->num_irqs = dev_info.num_irqs;
|
|
vbasedev->num_regions = dev_info.num_regions;
|
|
vbasedev->flags = dev_info.flags;
|
|
|
|
trace_vfio_get_device(name, dev_info.flags, dev_info.num_regions,
|
|
dev_info.num_irqs);
|
|
|
|
vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
|
|
return 0;
|
|
}
|
|
|
|
void vfio_put_base_device(VFIODevice *vbasedev)
|
|
{
|
|
if (!vbasedev->group) {
|
|
return;
|
|
}
|
|
QLIST_REMOVE(vbasedev, next);
|
|
vbasedev->group = NULL;
|
|
trace_vfio_put_base_device(vbasedev->fd);
|
|
close(vbasedev->fd);
|
|
}
|
|
|
|
int vfio_get_region_info(VFIODevice *vbasedev, int index,
|
|
struct vfio_region_info **info)
|
|
{
|
|
size_t argsz = sizeof(struct vfio_region_info);
|
|
|
|
*info = g_malloc0(argsz);
|
|
|
|
(*info)->index = index;
|
|
(*info)->argsz = argsz;
|
|
|
|
if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
|
|
g_free(*info);
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Interfaces for IBM EEH (Enhanced Error Handling)
|
|
*/
|
|
static bool vfio_eeh_container_ok(VFIOContainer *container)
|
|
{
|
|
/*
|
|
* As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
|
|
* implementation is broken if there are multiple groups in a
|
|
* container. The hardware works in units of Partitionable
|
|
* Endpoints (== IOMMU groups) and the EEH operations naively
|
|
* iterate across all groups in the container, without any logic
|
|
* to make sure the groups have their state synchronized. For
|
|
* certain operations (ENABLE) that might be ok, until an error
|
|
* occurs, but for others (GET_STATE) it's clearly broken.
|
|
*/
|
|
|
|
/*
|
|
* XXX Once fixed kernels exist, test for them here
|
|
*/
|
|
|
|
if (QLIST_EMPTY(&container->group_list)) {
|
|
return false;
|
|
}
|
|
|
|
if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
|
|
{
|
|
struct vfio_eeh_pe_op pe_op = {
|
|
.argsz = sizeof(pe_op),
|
|
.op = op,
|
|
};
|
|
int ret;
|
|
|
|
if (!vfio_eeh_container_ok(container)) {
|
|
error_report("vfio/eeh: EEH_PE_OP 0x%x: "
|
|
"kernel requires a container with exactly one group", op);
|
|
return -EPERM;
|
|
}
|
|
|
|
ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
|
|
if (ret < 0) {
|
|
error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
|
|
{
|
|
VFIOAddressSpace *space = vfio_get_address_space(as);
|
|
VFIOContainer *container = NULL;
|
|
|
|
if (QLIST_EMPTY(&space->containers)) {
|
|
/* No containers to act on */
|
|
goto out;
|
|
}
|
|
|
|
container = QLIST_FIRST(&space->containers);
|
|
|
|
if (QLIST_NEXT(container, next)) {
|
|
/* We don't yet have logic to synchronize EEH state across
|
|
* multiple containers */
|
|
container = NULL;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
vfio_put_address_space(space);
|
|
return container;
|
|
}
|
|
|
|
bool vfio_eeh_as_ok(AddressSpace *as)
|
|
{
|
|
VFIOContainer *container = vfio_eeh_as_container(as);
|
|
|
|
return (container != NULL) && vfio_eeh_container_ok(container);
|
|
}
|
|
|
|
int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
|
|
{
|
|
VFIOContainer *container = vfio_eeh_as_container(as);
|
|
|
|
if (!container) {
|
|
return -ENODEV;
|
|
}
|
|
return vfio_eeh_container_op(container, op);
|
|
}
|