| /* |
| * 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> |
| #ifdef CONFIG_KVM |
| #include <linux/kvm.h> |
| #endif |
| #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 "exec/ram_addr.h" |
| #include "hw/hw.h" |
| #include "qemu/error-report.h" |
| #include "qemu/main-loop.h" |
| #include "qemu/range.h" |
| #include "sysemu/kvm.h" |
| #include "sysemu/reset.h" |
| #include "sysemu/runstate.h" |
| #include "trace.h" |
| #include "qapi/error.h" |
| #include "migration/migration.h" |
| #include "sysemu/tpm.h" |
| |
| VFIOGroupList vfio_group_list = |
| QLIST_HEAD_INITIALIZER(vfio_group_list); |
| static QLIST_HEAD(, VFIOAddressSpace) 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); |
| } |
| |
| static inline const char *action_to_str(int action) |
| { |
| switch (action) { |
| case VFIO_IRQ_SET_ACTION_MASK: |
| return "MASK"; |
| case VFIO_IRQ_SET_ACTION_UNMASK: |
| return "UNMASK"; |
| case VFIO_IRQ_SET_ACTION_TRIGGER: |
| return "TRIGGER"; |
| default: |
| return "UNKNOWN ACTION"; |
| } |
| } |
| |
| static const char *index_to_str(VFIODevice *vbasedev, int index) |
| { |
| if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) { |
| return NULL; |
| } |
| |
| switch (index) { |
| case VFIO_PCI_INTX_IRQ_INDEX: |
| return "INTX"; |
| case VFIO_PCI_MSI_IRQ_INDEX: |
| return "MSI"; |
| case VFIO_PCI_MSIX_IRQ_INDEX: |
| return "MSIX"; |
| case VFIO_PCI_ERR_IRQ_INDEX: |
| return "ERR"; |
| case VFIO_PCI_REQ_IRQ_INDEX: |
| return "REQ"; |
| default: |
| return NULL; |
| } |
| } |
| |
| static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state) |
| { |
| switch (container->iommu_type) { |
| case VFIO_TYPE1v2_IOMMU: |
| case VFIO_TYPE1_IOMMU: |
| /* |
| * We support coordinated discarding of RAM via the RamDiscardManager. |
| */ |
| return ram_block_uncoordinated_discard_disable(state); |
| default: |
| /* |
| * VFIO_SPAPR_TCE_IOMMU most probably works just fine with |
| * RamDiscardManager, however, it is completely untested. |
| * |
| * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does |
| * completely the opposite of managing mapping/pinning dynamically as |
| * required by RamDiscardManager. We would have to special-case sections |
| * with a RamDiscardManager. |
| */ |
| return ram_block_discard_disable(state); |
| } |
| } |
| |
| int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, |
| int action, int fd, Error **errp) |
| { |
| struct vfio_irq_set *irq_set; |
| int argsz, ret = 0; |
| const char *name; |
| int32_t *pfd; |
| |
| argsz = sizeof(*irq_set) + sizeof(*pfd); |
| |
| irq_set = g_malloc0(argsz); |
| irq_set->argsz = argsz; |
| irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | action; |
| irq_set->index = index; |
| irq_set->start = subindex; |
| irq_set->count = 1; |
| pfd = (int32_t *)&irq_set->data; |
| *pfd = fd; |
| |
| if (ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set)) { |
| ret = -errno; |
| } |
| g_free(irq_set); |
| |
| if (!ret) { |
| return 0; |
| } |
| |
| error_setg_errno(errp, -ret, "VFIO_DEVICE_SET_IRQS failure"); |
| |
| name = index_to_str(vbasedev, index); |
| if (name) { |
| error_prepend(errp, "%s-%d: ", name, subindex); |
| } else { |
| error_prepend(errp, "index %d-%d: ", index, subindex); |
| } |
| error_prepend(errp, |
| "Failed to %s %s eventfd signaling for interrupt ", |
| fd < 0 ? "tear down" : "set up", action_to_str(action)); |
| return ret; |
| } |
| |
| /* |
| * 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; |
| case 8: |
| buf.qword = cpu_to_le64(data); |
| break; |
| default: |
| hw_error("vfio: unsupported write size, %u 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; |
| case 8: |
| data = le64_to_cpu(buf.qword); |
| break; |
| default: |
| hw_error("vfio: unsupported read size, %u 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, |
| .valid = { |
| .min_access_size = 1, |
| .max_access_size = 8, |
| }, |
| .impl = { |
| .min_access_size = 1, |
| .max_access_size = 8, |
| }, |
| }; |
| |
| /* |
| * Device state interfaces |
| */ |
| |
| bool vfio_mig_active(void) |
| { |
| VFIOGroup *group; |
| VFIODevice *vbasedev; |
| |
| if (QLIST_EMPTY(&vfio_group_list)) { |
| return false; |
| } |
| |
| QLIST_FOREACH(group, &vfio_group_list, next) { |
| QLIST_FOREACH(vbasedev, &group->device_list, next) { |
| if (vbasedev->migration_blocker) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| static bool vfio_devices_all_dirty_tracking(VFIOContainer *container) |
| { |
| VFIOGroup *group; |
| VFIODevice *vbasedev; |
| MigrationState *ms = migrate_get_current(); |
| |
| if (!migration_is_setup_or_active(ms->state)) { |
| return false; |
| } |
| |
| QLIST_FOREACH(group, &container->group_list, container_next) { |
| QLIST_FOREACH(vbasedev, &group->device_list, next) { |
| VFIOMigration *migration = vbasedev->migration; |
| |
| if (!migration) { |
| return false; |
| } |
| |
| if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF) |
| && (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| static bool vfio_devices_all_running_and_saving(VFIOContainer *container) |
| { |
| VFIOGroup *group; |
| VFIODevice *vbasedev; |
| MigrationState *ms = migrate_get_current(); |
| |
| if (!migration_is_setup_or_active(ms->state)) { |
| return false; |
| } |
| |
| QLIST_FOREACH(group, &container->group_list, container_next) { |
| QLIST_FOREACH(vbasedev, &group->device_list, next) { |
| VFIOMigration *migration = vbasedev->migration; |
| |
| if (!migration) { |
| return false; |
| } |
| |
| if ((migration->device_state & VFIO_DEVICE_STATE_V1_SAVING) && |
| (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) { |
| continue; |
| } else { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| static int vfio_dma_unmap_bitmap(VFIOContainer *container, |
| hwaddr iova, ram_addr_t size, |
| IOMMUTLBEntry *iotlb) |
| { |
| struct vfio_iommu_type1_dma_unmap *unmap; |
| struct vfio_bitmap *bitmap; |
| uint64_t pages = REAL_HOST_PAGE_ALIGN(size) / qemu_real_host_page_size(); |
| int ret; |
| |
| unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap)); |
| |
| unmap->argsz = sizeof(*unmap) + sizeof(*bitmap); |
| unmap->iova = iova; |
| unmap->size = size; |
| unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP; |
| bitmap = (struct vfio_bitmap *)&unmap->data; |
| |
| /* |
| * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of |
| * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize |
| * to qemu_real_host_page_size. |
| */ |
| |
| bitmap->pgsize = qemu_real_host_page_size(); |
| bitmap->size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / |
| BITS_PER_BYTE; |
| |
| if (bitmap->size > container->max_dirty_bitmap_size) { |
| error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, |
| (uint64_t)bitmap->size); |
| ret = -E2BIG; |
| goto unmap_exit; |
| } |
| |
| bitmap->data = g_try_malloc0(bitmap->size); |
| if (!bitmap->data) { |
| ret = -ENOMEM; |
| goto unmap_exit; |
| } |
| |
| ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap); |
| if (!ret) { |
| cpu_physical_memory_set_dirty_lebitmap((unsigned long *)bitmap->data, |
| iotlb->translated_addr, pages); |
| } else { |
| error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m"); |
| } |
| |
| g_free(bitmap->data); |
| unmap_exit: |
| g_free(unmap); |
| return ret; |
| } |
| |
| /* |
| * 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, |
| IOMMUTLBEntry *iotlb) |
| { |
| struct vfio_iommu_type1_dma_unmap unmap = { |
| .argsz = sizeof(unmap), |
| .flags = 0, |
| .iova = iova, |
| .size = size, |
| }; |
| |
| if (iotlb && container->dirty_pages_supported && |
| vfio_devices_all_running_and_saving(container)) { |
| return vfio_dma_unmap_bitmap(container, iova, size, iotlb); |
| } |
| |
| while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { |
| /* |
| * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c |
| * v4.15) where an overflow in its wrap-around check prevents us from |
| * unmapping the last page of the address space. Test for the error |
| * condition and re-try the unmap excluding the last page. The |
| * expectation is that we've never mapped the last page anyway and this |
| * unmap request comes via vIOMMU support which also makes it unlikely |
| * that this page is used. This bug was introduced well after type1 v2 |
| * support was introduced, so we shouldn't need to test for v1. A fix |
| * is queued for kernel v5.0 so this workaround can be removed once |
| * affected kernels are sufficiently deprecated. |
| */ |
| if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) && |
| container->iommu_type == VFIO_TYPE1v2_IOMMU) { |
| trace_vfio_dma_unmap_overflow_workaround(); |
| unmap.size -= 1ULL << ctz64(container->pgsizes); |
| continue; |
| } |
| error_report("VFIO_UNMAP_DMA failed: %s", strerror(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, NULL) == 0 && |
| ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { |
| return 0; |
| } |
| |
| error_report("VFIO_MAP_DMA failed: %s", strerror(errno)); |
| return -errno; |
| } |
| |
| static void vfio_host_win_add(VFIOContainer *container, |
| hwaddr min_iova, hwaddr max_iova, |
| uint64_t iova_pgsizes) |
| { |
| VFIOHostDMAWindow *hostwin; |
| |
| QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { |
| if (ranges_overlap(hostwin->min_iova, |
| hostwin->max_iova - hostwin->min_iova + 1, |
| min_iova, |
| max_iova - min_iova + 1)) { |
| hw_error("%s: Overlapped IOMMU are not enabled", __func__); |
| } |
| } |
| |
| hostwin = g_malloc0(sizeof(*hostwin)); |
| |
| hostwin->min_iova = min_iova; |
| hostwin->max_iova = max_iova; |
| hostwin->iova_pgsizes = iova_pgsizes; |
| QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next); |
| } |
| |
| static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova, |
| hwaddr max_iova) |
| { |
| VFIOHostDMAWindow *hostwin; |
| |
| QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { |
| if (hostwin->min_iova == min_iova && hostwin->max_iova == max_iova) { |
| QLIST_REMOVE(hostwin, hostwin_next); |
| g_free(hostwin); |
| return 0; |
| } |
| } |
| |
| return -1; |
| } |
| |
| static bool vfio_listener_skipped_section(MemoryRegionSection *section) |
| { |
| return (!memory_region_is_ram(section->mr) && |
| !memory_region_is_iommu(section->mr)) || |
| memory_region_is_protected(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); |
| } |
| |
| /* Called with rcu_read_lock held. */ |
| static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, |
| ram_addr_t *ram_addr, bool *read_only) |
| { |
| MemoryRegion *mr; |
| hwaddr xlat; |
| hwaddr len = iotlb->addr_mask + 1; |
| bool writable = iotlb->perm & IOMMU_WO; |
| |
| /* |
| * 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, writable, |
| MEMTXATTRS_UNSPECIFIED); |
| if (!memory_region_is_ram(mr)) { |
| error_report("iommu map to non memory area %"HWADDR_PRIx"", |
| xlat); |
| return false; |
| } else if (memory_region_has_ram_discard_manager(mr)) { |
| RamDiscardManager *rdm = memory_region_get_ram_discard_manager(mr); |
| MemoryRegionSection tmp = { |
| .mr = mr, |
| .offset_within_region = xlat, |
| .size = int128_make64(len), |
| }; |
| |
| /* |
| * Malicious VMs can map memory into the IOMMU, which is expected |
| * to remain discarded. vfio will pin all pages, populating memory. |
| * Disallow that. vmstate priorities make sure any RamDiscardManager |
| * were already restored before IOMMUs are restored. |
| */ |
| if (!ram_discard_manager_is_populated(rdm, &tmp)) { |
| error_report("iommu map to discarded memory (e.g., unplugged via" |
| " virtio-mem): %"HWADDR_PRIx"", |
| iotlb->translated_addr); |
| return false; |
| } |
| |
| /* |
| * Malicious VMs might trigger discarding of IOMMU-mapped memory. The |
| * pages will remain pinned inside vfio until unmapped, resulting in a |
| * higher memory consumption than expected. If memory would get |
| * populated again later, there would be an inconsistency between pages |
| * pinned by vfio and pages seen by QEMU. This is the case until |
| * unmapped from the IOMMU (e.g., during device reset). |
| * |
| * With malicious guests, we really only care about pinning more memory |
| * than expected. RLIMIT_MEMLOCK set for the user/process can never be |
| * exceeded and can be used to mitigate this problem. |
| */ |
| warn_report_once("Using vfio with vIOMMUs and coordinated discarding of" |
| " RAM (e.g., virtio-mem) works, however, malicious" |
| " guests can trigger pinning of more memory than" |
| " intended via an IOMMU. It's possible to mitigate " |
| " by setting/adjusting RLIMIT_MEMLOCK."); |
| } |
| |
| /* |
| * 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"); |
| return false; |
| } |
| |
| if (vaddr) { |
| *vaddr = memory_region_get_ram_ptr(mr) + xlat; |
| } |
| |
| if (ram_addr) { |
| *ram_addr = memory_region_get_ram_addr(mr) + xlat; |
| } |
| |
| if (read_only) { |
| *read_only = !writable || mr->readonly; |
| } |
| |
| return true; |
| } |
| |
| static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
| { |
| VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n); |
| VFIOContainer *container = giommu->container; |
| hwaddr iova = iotlb->iova + giommu->iommu_offset; |
| void *vaddr; |
| int ret; |
| |
| trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP", |
| iova, iova + iotlb->addr_mask); |
| |
| if (iotlb->target_as != &address_space_memory) { |
| error_report("Wrong target AS \"%s\", only system memory is allowed", |
| iotlb->target_as->name ? iotlb->target_as->name : "none"); |
| return; |
| } |
| |
| rcu_read_lock(); |
| |
| if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { |
| bool read_only; |
| |
| if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only)) { |
| goto out; |
| } |
| /* |
| * vaddr is only valid until rcu_read_unlock(). But after |
| * vfio_dma_map has set up the mapping the pages will be |
| * pinned by the kernel. This makes sure that the RAM backend |
| * of vaddr will always be there, even if the memory object is |
| * destroyed and its backing memory munmap-ed. |
| */ |
| ret = vfio_dma_map(container, iova, |
| iotlb->addr_mask + 1, vaddr, |
| read_only); |
| if (ret) { |
| error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", " |
| "0x%"HWADDR_PRIx", %p) = %d (%m)", |
| container, iova, |
| iotlb->addr_mask + 1, vaddr, ret); |
| } |
| } else { |
| ret = vfio_dma_unmap(container, iova, iotlb->addr_mask + 1, iotlb); |
| if (ret) { |
| error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " |
| "0x%"HWADDR_PRIx") = %d (%m)", |
| container, iova, |
| iotlb->addr_mask + 1, ret); |
| } |
| } |
| out: |
| rcu_read_unlock(); |
| } |
| |
| static void vfio_ram_discard_notify_discard(RamDiscardListener *rdl, |
| MemoryRegionSection *section) |
| { |
| VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener, |
| listener); |
| const hwaddr size = int128_get64(section->size); |
| const hwaddr iova = section->offset_within_address_space; |
| int ret; |
| |
| /* Unmap with a single call. */ |
| ret = vfio_dma_unmap(vrdl->container, iova, size , NULL); |
| if (ret) { |
| error_report("%s: vfio_dma_unmap() failed: %s", __func__, |
| strerror(-ret)); |
| } |
| } |
| |
| static int vfio_ram_discard_notify_populate(RamDiscardListener *rdl, |
| MemoryRegionSection *section) |
| { |
| VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener, |
| listener); |
| const hwaddr end = section->offset_within_region + |
| int128_get64(section->size); |
| hwaddr start, next, iova; |
| void *vaddr; |
| int ret; |
| |
| /* |
| * Map in (aligned within memory region) minimum granularity, so we can |
| * unmap in minimum granularity later. |
| */ |
| for (start = section->offset_within_region; start < end; start = next) { |
| next = ROUND_UP(start + 1, vrdl->granularity); |
| next = MIN(next, end); |
| |
| iova = start - section->offset_within_region + |
| section->offset_within_address_space; |
| vaddr = memory_region_get_ram_ptr(section->mr) + start; |
| |
| ret = vfio_dma_map(vrdl->container, iova, next - start, |
| vaddr, section->readonly); |
| if (ret) { |
| /* Rollback */ |
| vfio_ram_discard_notify_discard(rdl, section); |
| return ret; |
| } |
| } |
| return 0; |
| } |
| |
| static void vfio_register_ram_discard_listener(VFIOContainer *container, |
| MemoryRegionSection *section) |
| { |
| RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr); |
| VFIORamDiscardListener *vrdl; |
| |
| /* Ignore some corner cases not relevant in practice. */ |
| g_assert(QEMU_IS_ALIGNED(section->offset_within_region, TARGET_PAGE_SIZE)); |
| g_assert(QEMU_IS_ALIGNED(section->offset_within_address_space, |
| TARGET_PAGE_SIZE)); |
| g_assert(QEMU_IS_ALIGNED(int128_get64(section->size), TARGET_PAGE_SIZE)); |
| |
| vrdl = g_new0(VFIORamDiscardListener, 1); |
| vrdl->container = container; |
| vrdl->mr = section->mr; |
| vrdl->offset_within_address_space = section->offset_within_address_space; |
| vrdl->size = int128_get64(section->size); |
| vrdl->granularity = ram_discard_manager_get_min_granularity(rdm, |
| section->mr); |
| |
| g_assert(vrdl->granularity && is_power_of_2(vrdl->granularity)); |
| g_assert(container->pgsizes && |
| vrdl->granularity >= 1ULL << ctz64(container->pgsizes)); |
| |
| ram_discard_listener_init(&vrdl->listener, |
| vfio_ram_discard_notify_populate, |
| vfio_ram_discard_notify_discard, true); |
| ram_discard_manager_register_listener(rdm, &vrdl->listener, section); |
| QLIST_INSERT_HEAD(&container->vrdl_list, vrdl, next); |
| |
| /* |
| * Sanity-check if we have a theoretically problematic setup where we could |
| * exceed the maximum number of possible DMA mappings over time. We assume |
| * that each mapped section in the same address space as a RamDiscardManager |
| * section consumes exactly one DMA mapping, with the exception of |
| * RamDiscardManager sections; i.e., we don't expect to have gIOMMU sections |
| * in the same address space as RamDiscardManager sections. |
| * |
| * We assume that each section in the address space consumes one memslot. |
| * We take the number of KVM memory slots as a best guess for the maximum |
| * number of sections in the address space we could have over time, |
| * also consuming DMA mappings. |
| */ |
| if (container->dma_max_mappings) { |
| unsigned int vrdl_count = 0, vrdl_mappings = 0, max_memslots = 512; |
| |
| #ifdef CONFIG_KVM |
| if (kvm_enabled()) { |
| max_memslots = kvm_get_max_memslots(); |
| } |
| #endif |
| |
| QLIST_FOREACH(vrdl, &container->vrdl_list, next) { |
| hwaddr start, end; |
| |
| start = QEMU_ALIGN_DOWN(vrdl->offset_within_address_space, |
| vrdl->granularity); |
| end = ROUND_UP(vrdl->offset_within_address_space + vrdl->size, |
| vrdl->granularity); |
| vrdl_mappings += (end - start) / vrdl->granularity; |
| vrdl_count++; |
| } |
| |
| if (vrdl_mappings + max_memslots - vrdl_count > |
| container->dma_max_mappings) { |
| warn_report("%s: possibly running out of DMA mappings. E.g., try" |
| " increasing the 'block-size' of virtio-mem devies." |
| " Maximum possible DMA mappings: %d, Maximum possible" |
| " memslots: %d", __func__, container->dma_max_mappings, |
| max_memslots); |
| } |
| } |
| } |
| |
| static void vfio_unregister_ram_discard_listener(VFIOContainer *container, |
| MemoryRegionSection *section) |
| { |
| RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr); |
| VFIORamDiscardListener *vrdl = NULL; |
| |
| QLIST_FOREACH(vrdl, &container->vrdl_list, next) { |
| if (vrdl->mr == section->mr && |
| vrdl->offset_within_address_space == |
| section->offset_within_address_space) { |
| break; |
| } |
| } |
| |
| if (!vrdl) { |
| hw_error("vfio: Trying to unregister missing RAM discard listener"); |
| } |
| |
| ram_discard_manager_unregister_listener(rdm, &vrdl->listener); |
| QLIST_REMOVE(vrdl, next); |
| g_free(vrdl); |
| } |
| |
| static bool vfio_known_safe_misalignment(MemoryRegionSection *section) |
| { |
| MemoryRegion *mr = section->mr; |
| |
| if (!TPM_IS_CRB(mr->owner)) { |
| return false; |
| } |
| |
| /* this is a known safe misaligned region, just trace for debug purpose */ |
| trace_vfio_known_safe_misalignment(memory_region_name(mr), |
| section->offset_within_address_space, |
| section->offset_within_region, |
| qemu_real_host_page_size()); |
| return true; |
| } |
| |
| 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; |
| VFIOHostDMAWindow *hostwin; |
| bool hostwin_found; |
| Error *err = NULL; |
| |
| 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 & |
| ~qemu_real_host_page_mask()) != |
| (section->offset_within_region & ~qemu_real_host_page_mask()))) { |
| if (!vfio_known_safe_misalignment(section)) { |
| error_report("%s received unaligned region %s iova=0x%"PRIx64 |
| " offset_within_region=0x%"PRIx64 |
| " qemu_real_host_page_size=0x%"PRIxPTR, |
| __func__, memory_region_name(section->mr), |
| section->offset_within_address_space, |
| section->offset_within_region, |
| qemu_real_host_page_size()); |
| } |
| return; |
| } |
| |
| iova = REAL_HOST_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(qemu_real_host_page_mask())); |
| |
| if (int128_ge(int128_make64(iova), llend)) { |
| if (memory_region_is_ram_device(section->mr)) { |
| trace_vfio_listener_region_add_no_dma_map( |
| memory_region_name(section->mr), |
| section->offset_within_address_space, |
| int128_getlo(section->size), |
| qemu_real_host_page_size()); |
| } |
| return; |
| } |
| end = int128_get64(int128_sub(llend, int128_one())); |
| |
| if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { |
| hwaddr pgsize = 0; |
| |
| /* For now intersections are not allowed, we may relax this later */ |
| QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { |
| if (ranges_overlap(hostwin->min_iova, |
| hostwin->max_iova - hostwin->min_iova + 1, |
| section->offset_within_address_space, |
| int128_get64(section->size))) { |
| error_setg(&err, |
| "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing" |
| "host DMA window [0x%"PRIx64",0x%"PRIx64"]", |
| section->offset_within_address_space, |
| section->offset_within_address_space + |
| int128_get64(section->size) - 1, |
| hostwin->min_iova, hostwin->max_iova); |
| goto fail; |
| } |
| } |
| |
| ret = vfio_spapr_create_window(container, section, &pgsize); |
| if (ret) { |
| error_setg_errno(&err, -ret, "Failed to create SPAPR window"); |
| goto fail; |
| } |
| |
| vfio_host_win_add(container, section->offset_within_address_space, |
| section->offset_within_address_space + |
| int128_get64(section->size) - 1, pgsize); |
| #ifdef CONFIG_KVM |
| if (kvm_enabled()) { |
| VFIOGroup *group; |
| IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); |
| struct kvm_vfio_spapr_tce param; |
| struct kvm_device_attr attr = { |
| .group = KVM_DEV_VFIO_GROUP, |
| .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE, |
| .addr = (uint64_t)(unsigned long)¶m, |
| }; |
| |
| if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD, |
| ¶m.tablefd)) { |
| QLIST_FOREACH(group, &container->group_list, container_next) { |
| param.groupfd = group->fd; |
| if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) { |
| error_report("vfio: failed to setup fd %d " |
| "for a group with fd %d: %s", |
| param.tablefd, param.groupfd, |
| strerror(errno)); |
| return; |
| } |
| trace_vfio_spapr_group_attach(param.groupfd, param.tablefd); |
| } |
| } |
| } |
| #endif |
| } |
| |
| hostwin_found = false; |
| QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { |
| if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { |
| hostwin_found = true; |
| break; |
| } |
| } |
| |
| if (!hostwin_found) { |
| error_setg(&err, "Container %p can't map guest IOVA region" |
| " 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx, container, iova, end); |
| goto fail; |
| } |
| |
| memory_region_ref(section->mr); |
| |
| if (memory_region_is_iommu(section->mr)) { |
| VFIOGuestIOMMU *giommu; |
| IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr); |
| int iommu_idx; |
| |
| trace_vfio_listener_region_add_iommu(iova, end); |
| /* |
| * 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_mr = iommu_mr; |
| giommu->iommu_offset = section->offset_within_address_space - |
| section->offset_within_region; |
| giommu->container = container; |
| llend = int128_add(int128_make64(section->offset_within_region), |
| section->size); |
| llend = int128_sub(llend, int128_one()); |
| iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, |
| MEMTXATTRS_UNSPECIFIED); |
| iommu_notifier_init(&giommu->n, vfio_iommu_map_notify, |
| IOMMU_NOTIFIER_IOTLB_EVENTS, |
| section->offset_within_region, |
| int128_get64(llend), |
| iommu_idx); |
| |
| ret = memory_region_iommu_set_page_size_mask(giommu->iommu_mr, |
| container->pgsizes, |
| &err); |
| if (ret) { |
| g_free(giommu); |
| goto fail; |
| } |
| |
| ret = memory_region_register_iommu_notifier(section->mr, &giommu->n, |
| &err); |
| if (ret) { |
| g_free(giommu); |
| goto fail; |
| } |
| QLIST_INSERT_HEAD(&container->giommu_list, giommu, giommu_next); |
| memory_region_iommu_replay(giommu->iommu_mr, &giommu->n); |
| |
| return; |
| } |
| |
| /* Here we assume that memory_region_is_ram(section->mr)==true */ |
| |
| /* |
| * For RAM memory regions with a RamDiscardManager, we only want to map the |
| * actually populated parts - and update the mapping whenever we're notified |
| * about changes. |
| */ |
| if (memory_region_has_ram_discard_manager(section->mr)) { |
| vfio_register_ram_discard_listener(container, section); |
| return; |
| } |
| |
| 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)); |
| |
| if (memory_region_is_ram_device(section->mr)) { |
| hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; |
| |
| if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) { |
| trace_vfio_listener_region_add_no_dma_map( |
| memory_region_name(section->mr), |
| section->offset_within_address_space, |
| int128_getlo(section->size), |
| pgmask + 1); |
| return; |
| } |
| } |
| |
| ret = vfio_dma_map(container, iova, int128_get64(llsize), |
| vaddr, section->readonly); |
| if (ret) { |
| error_setg(&err, "vfio_dma_map(%p, 0x%"HWADDR_PRIx", " |
| "0x%"HWADDR_PRIx", %p) = %d (%m)", |
| container, iova, int128_get64(llsize), vaddr, ret); |
| if (memory_region_is_ram_device(section->mr)) { |
| /* Allow unexpected mappings not to be fatal for RAM devices */ |
| error_report_err(err); |
| return; |
| } |
| goto fail; |
| } |
| |
| return; |
| |
| fail: |
| if (memory_region_is_ram_device(section->mr)) { |
| error_report("failed to vfio_dma_map. pci p2p may not work"); |
| return; |
| } |
| /* |
| * 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) { |
| error_propagate_prepend(&container->error, err, |
| "Region %s: ", |
| memory_region_name(section->mr)); |
| } else { |
| error_free(err); |
| } |
| } else { |
| error_report_err(err); |
| 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; |
| Int128 llend, llsize; |
| int ret; |
| bool try_unmap = true; |
| |
| 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 & |
| ~qemu_real_host_page_mask()) != |
| (section->offset_within_region & ~qemu_real_host_page_mask()))) { |
| if (!vfio_known_safe_misalignment(section)) { |
| error_report("%s received unaligned region %s iova=0x%"PRIx64 |
| " offset_within_region=0x%"PRIx64 |
| " qemu_real_host_page_size=0x%"PRIxPTR, |
| __func__, memory_region_name(section->mr), |
| section->offset_within_address_space, |
| section->offset_within_region, |
| qemu_real_host_page_size()); |
| } |
| return; |
| } |
| |
| if (memory_region_is_iommu(section->mr)) { |
| VFIOGuestIOMMU *giommu; |
| |
| QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { |
| if (MEMORY_REGION(giommu->iommu_mr) == section->mr && |
| giommu->n.start == section->offset_within_region) { |
| memory_region_unregister_iommu_notifier(section->mr, |
| &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 = REAL_HOST_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(qemu_real_host_page_mask())); |
| |
| if (int128_ge(int128_make64(iova), llend)) { |
| return; |
| } |
| end = int128_get64(int128_sub(llend, int128_one())); |
| |
| llsize = int128_sub(llend, int128_make64(iova)); |
| |
| trace_vfio_listener_region_del(iova, end); |
| |
| if (memory_region_is_ram_device(section->mr)) { |
| hwaddr pgmask; |
| VFIOHostDMAWindow *hostwin; |
| bool hostwin_found = false; |
| |
| QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) { |
| if (hostwin->min_iova <= iova && end <= hostwin->max_iova) { |
| hostwin_found = true; |
| break; |
| } |
| } |
| assert(hostwin_found); /* or region_add() would have failed */ |
| |
| pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1; |
| try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask)); |
| } else if (memory_region_has_ram_discard_manager(section->mr)) { |
| vfio_unregister_ram_discard_listener(container, section); |
| /* Unregistering will trigger an unmap. */ |
| try_unmap = false; |
| } |
| |
| if (try_unmap) { |
| if (int128_eq(llsize, int128_2_64())) { |
| /* The unmap ioctl doesn't accept a full 64-bit span. */ |
| llsize = int128_rshift(llsize, 1); |
| ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); |
| if (ret) { |
| error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " |
| "0x%"HWADDR_PRIx") = %d (%m)", |
| container, iova, int128_get64(llsize), ret); |
| } |
| iova += int128_get64(llsize); |
| } |
| ret = vfio_dma_unmap(container, iova, int128_get64(llsize), NULL); |
| if (ret) { |
| error_report("vfio_dma_unmap(%p, 0x%"HWADDR_PRIx", " |
| "0x%"HWADDR_PRIx") = %d (%m)", |
| container, iova, int128_get64(llsize), ret); |
| } |
| } |
| |
| memory_region_unref(section->mr); |
| |
| if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { |
| vfio_spapr_remove_window(container, |
| section->offset_within_address_space); |
| if (vfio_host_win_del(container, |
| section->offset_within_address_space, |
| section->offset_within_address_space + |
| int128_get64(section->size) - 1) < 0) { |
| hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx, |
| __func__, section->offset_within_address_space); |
| } |
| } |
| } |
| |
| static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start) |
| { |
| int ret; |
| struct vfio_iommu_type1_dirty_bitmap dirty = { |
| .argsz = sizeof(dirty), |
| }; |
| |
| if (start) { |
| dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START; |
| } else { |
| dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP; |
| } |
| |
| ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty); |
| if (ret) { |
| error_report("Failed to set dirty tracking flag 0x%x errno: %d", |
| dirty.flags, errno); |
| } |
| } |
| |
| static void vfio_listener_log_global_start(MemoryListener *listener) |
| { |
| VFIOContainer *container = container_of(listener, VFIOContainer, listener); |
| |
| vfio_set_dirty_page_tracking(container, true); |
| } |
| |
| static void vfio_listener_log_global_stop(MemoryListener *listener) |
| { |
| VFIOContainer *container = container_of(listener, VFIOContainer, listener); |
| |
| vfio_set_dirty_page_tracking(container, false); |
| } |
| |
| static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova, |
| uint64_t size, ram_addr_t ram_addr) |
| { |
| struct vfio_iommu_type1_dirty_bitmap *dbitmap; |
| struct vfio_iommu_type1_dirty_bitmap_get *range; |
| uint64_t pages; |
| int ret; |
| |
| dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range)); |
| |
| dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range); |
| dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP; |
| range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data; |
| range->iova = iova; |
| range->size = size; |
| |
| /* |
| * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of |
| * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize |
| * to qemu_real_host_page_size. |
| */ |
| range->bitmap.pgsize = qemu_real_host_page_size(); |
| |
| pages = REAL_HOST_PAGE_ALIGN(range->size) / qemu_real_host_page_size(); |
| range->bitmap.size = ROUND_UP(pages, sizeof(__u64) * BITS_PER_BYTE) / |
| BITS_PER_BYTE; |
| range->bitmap.data = g_try_malloc0(range->bitmap.size); |
| if (!range->bitmap.data) { |
| ret = -ENOMEM; |
| goto err_out; |
| } |
| |
| ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap); |
| if (ret) { |
| error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64 |
| " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova, |
| (uint64_t)range->size, errno); |
| goto err_out; |
| } |
| |
| cpu_physical_memory_set_dirty_lebitmap((unsigned long *)range->bitmap.data, |
| ram_addr, pages); |
| |
| trace_vfio_get_dirty_bitmap(container->fd, range->iova, range->size, |
| range->bitmap.size, ram_addr); |
| err_out: |
| g_free(range->bitmap.data); |
| g_free(dbitmap); |
| |
| return ret; |
| } |
| |
| typedef struct { |
| IOMMUNotifier n; |
| VFIOGuestIOMMU *giommu; |
| } vfio_giommu_dirty_notifier; |
| |
| static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) |
| { |
| vfio_giommu_dirty_notifier *gdn = container_of(n, |
| vfio_giommu_dirty_notifier, n); |
| VFIOGuestIOMMU *giommu = gdn->giommu; |
| VFIOContainer *container = giommu->container; |
| hwaddr iova = iotlb->iova + giommu->iommu_offset; |
| ram_addr_t translated_addr; |
| |
| trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask); |
| |
| if (iotlb->target_as != &address_space_memory) { |
| error_report("Wrong target AS \"%s\", only system memory is allowed", |
| iotlb->target_as->name ? iotlb->target_as->name : "none"); |
| return; |
| } |
| |
| rcu_read_lock(); |
| if (vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL)) { |
| int ret; |
| |
| ret = vfio_get_dirty_bitmap(container, iova, iotlb->addr_mask + 1, |
| translated_addr); |
| if (ret) { |
| error_report("vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", " |
| "0x%"HWADDR_PRIx") = %d (%m)", |
| container, iova, |
| iotlb->addr_mask + 1, ret); |
| } |
| } |
| rcu_read_unlock(); |
| } |
| |
| static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section, |
| void *opaque) |
| { |
| const hwaddr size = int128_get64(section->size); |
| const hwaddr iova = section->offset_within_address_space; |
| const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) + |
| section->offset_within_region; |
| VFIORamDiscardListener *vrdl = opaque; |
| |
| /* |
| * Sync the whole mapped region (spanning multiple individual mappings) |
| * in one go. |
| */ |
| return vfio_get_dirty_bitmap(vrdl->container, iova, size, ram_addr); |
| } |
| |
| static int vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainer *container, |
| MemoryRegionSection *section) |
| { |
| RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr); |
| VFIORamDiscardListener *vrdl = NULL; |
| |
| QLIST_FOREACH(vrdl, &container->vrdl_list, next) { |
| if (vrdl->mr == section->mr && |
| vrdl->offset_within_address_space == |
| section->offset_within_address_space) { |
| break; |
| } |
| } |
| |
| if (!vrdl) { |
| hw_error("vfio: Trying to sync missing RAM discard listener"); |
| } |
| |
| /* |
| * We only want/can synchronize the bitmap for actually mapped parts - |
| * which correspond to populated parts. Replay all populated parts. |
| */ |
| return ram_discard_manager_replay_populated(rdm, section, |
| vfio_ram_discard_get_dirty_bitmap, |
| &vrdl); |
| } |
| |
| static int vfio_sync_dirty_bitmap(VFIOContainer *container, |
| MemoryRegionSection *section) |
| { |
| ram_addr_t ram_addr; |
| |
| if (memory_region_is_iommu(section->mr)) { |
| VFIOGuestIOMMU *giommu; |
| |
| QLIST_FOREACH(giommu, &container->giommu_list, giommu_next) { |
| if (MEMORY_REGION(giommu->iommu_mr) == section->mr && |
| giommu->n.start == section->offset_within_region) { |
| Int128 llend; |
| vfio_giommu_dirty_notifier gdn = { .giommu = giommu }; |
| int idx = memory_region_iommu_attrs_to_index(giommu->iommu_mr, |
| MEMTXATTRS_UNSPECIFIED); |
| |
| llend = int128_add(int128_make64(section->offset_within_region), |
| section->size); |
| llend = int128_sub(llend, int128_one()); |
| |
| iommu_notifier_init(&gdn.n, |
| vfio_iommu_map_dirty_notify, |
| IOMMU_NOTIFIER_MAP, |
| section->offset_within_region, |
| int128_get64(llend), |
| idx); |
| memory_region_iommu_replay(giommu->iommu_mr, &gdn.n); |
| break; |
| } |
| } |
| return 0; |
| } else if (memory_region_has_ram_discard_manager(section->mr)) { |
| return vfio_sync_ram_discard_listener_dirty_bitmap(container, section); |
| } |
| |
| ram_addr = memory_region_get_ram_addr(section->mr) + |
| section->offset_within_region; |
| |
| return vfio_get_dirty_bitmap(container, |
| REAL_HOST_PAGE_ALIGN(section->offset_within_address_space), |
| int128_get64(section->size), ram_addr); |
| } |
| |
| static void vfio_listener_log_sync(MemoryListener *listener, |
| MemoryRegionSection *section) |
| { |
| VFIOContainer *container = container_of(listener, VFIOContainer, listener); |
| |
| if (vfio_listener_skipped_section(section) || |
| !container->dirty_pages_supported) { |
| return; |
| } |
| |
| if (vfio_devices_all_dirty_tracking(container)) { |
| vfio_sync_dirty_bitmap(container, section); |
| } |
| } |
| |
| static const MemoryListener vfio_memory_listener = { |
| .name = "vfio", |
| .region_add = vfio_listener_region_add, |
| .region_del = vfio_listener_region_del, |
| .log_global_start = vfio_listener_log_global_start, |
| .log_global_stop = vfio_listener_log_global_stop, |
| .log_sync = vfio_listener_log_sync, |
| }; |
| |
| static void vfio_listener_release(VFIOContainer *container) |
| { |
| memory_listener_unregister(&container->listener); |
| if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { |
| memory_listener_unregister(&container->prereg_listener); |
| } |
| } |
| |
| static struct vfio_info_cap_header * |
| vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id) |
| { |
| struct vfio_info_cap_header *hdr; |
| |
| for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) { |
| if (hdr->id == id) { |
| return hdr; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| struct vfio_info_cap_header * |
| vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id) |
| { |
| if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) { |
| return NULL; |
| } |
| |
| return vfio_get_cap((void *)info, info->cap_offset, id); |
| } |
| |
| static struct vfio_info_cap_header * |
| vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) |
| { |
| if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { |
| return NULL; |
| } |
| |
| return vfio_get_cap((void *)info, info->cap_offset, id); |
| } |
| |
| struct vfio_info_cap_header * |
| vfio_get_device_info_cap(struct vfio_device_info *info, uint16_t id) |
| { |
| if (!(info->flags & VFIO_DEVICE_FLAGS_CAPS)) { |
| return NULL; |
| } |
| |
| return vfio_get_cap((void *)info, info->cap_offset, id); |
| } |
| |
| bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info, |
| unsigned int *avail) |
| { |
| struct vfio_info_cap_header *hdr; |
| struct vfio_iommu_type1_info_dma_avail *cap; |
| |
| /* If the capability cannot be found, assume no DMA limiting */ |
| hdr = vfio_get_iommu_type1_info_cap(info, |
| VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL); |
| if (hdr == NULL) { |
| return false; |
| } |
| |
| if (avail != NULL) { |
| cap = (void *) hdr; |
| *avail = cap->avail; |
| } |
| |
| return true; |
| } |
| |
| static int vfio_setup_region_sparse_mmaps(VFIORegion *region, |
| struct vfio_region_info *info) |
| { |
| struct vfio_info_cap_header *hdr; |
| struct vfio_region_info_cap_sparse_mmap *sparse; |
| int i, j; |
| |
| hdr = vfio_get_region_info_cap(info, VFIO_REGION_INFO_CAP_SPARSE_MMAP); |
| if (!hdr) { |
| return -ENODEV; |
| } |
| |
| sparse = container_of(hdr, struct vfio_region_info_cap_sparse_mmap, header); |
| |
| trace_vfio_region_sparse_mmap_header(region->vbasedev->name, |
| region->nr, sparse->nr_areas); |
| |
| region->mmaps = g_new0(VFIOMmap, sparse->nr_areas); |
| |
| for (i = 0, j = 0; i < sparse->nr_areas; i++) { |
| if (sparse->areas[i].size) { |
| trace_vfio_region_sparse_mmap_entry(i, sparse->areas[i].offset, |
| sparse->areas[i].offset + |
| sparse->areas[i].size - 1); |
| region->mmaps[j].offset = sparse->areas[i].offset; |
| region->mmaps[j].size = sparse->areas[i].size; |
| j++; |
| } |
| } |
| |
| region->nr_mmaps = j; |
| region->mmaps = g_realloc(region->mmaps, j * sizeof(VFIOMmap)); |
| |
| return 0; |
| } |
| |
| 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) { |
| |
| ret = vfio_setup_region_sparse_mmaps(region, info); |
| |
| if (ret) { |
| 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; |
| } |
| |
| static void vfio_subregion_unmap(VFIORegion *region, int index) |
| { |
| trace_vfio_region_unmap(memory_region_name(®ion->mmaps[index].mem), |
| region->mmaps[index].offset, |
| region->mmaps[index].offset + |
| region->mmaps[index].size - 1); |
| memory_region_del_subregion(region->mem, ®ion->mmaps[index].mem); |
| munmap(region->mmaps[index].mmap, region->mmaps[index].size); |
| object_unparent(OBJECT(®ion->mmaps[index].mem)); |
| region->mmaps[index].mmap = NULL; |
| } |
| |
| 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--) { |
| vfio_subregion_unmap(region, i); |
| } |
| |
| return ret; |
| } |
| |
| name = g_strdup_printf("%s mmaps[%d]", |
| memory_region_name(region->mem), i); |
| memory_region_init_ram_device_ptr(®ion->mmaps[i].mem, |
| memory_region_owner(region->mem), |
| name, region->mmaps[i].size, |
| region->mmaps[i].mmap); |
| g_free(name); |
| 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_unmap(VFIORegion *region) |
| { |
| int i; |
| |
| if (!region->mem) { |
| return; |
| } |
| |
| for (i = 0; i < region->nr_mmaps; i++) { |
| if (region->mmaps[i].mmap) { |
| vfio_subregion_unmap(region, i); |
| } |
| } |
| } |
| |
| 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); |
| |
| region->mem = NULL; |
| region->mmaps = NULL; |
| region->nr_mmaps = 0; |
| region->size = 0; |
| region->flags = 0; |
| region->nr = 0; |
| } |
| |
| 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) { |
| if (vbasedev->dev->realized) { |
| vbasedev->ops->vfio_compute_needs_reset(vbasedev); |
| } |
| } |
| } |
| |
| QLIST_FOREACH(group, &vfio_group_list, next) { |
| QLIST_FOREACH(vbasedev, &group->device_list, next) { |
| if (vbasedev->dev->realized && 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); |
| } |
| } |
| |
| /* |
| * vfio_get_iommu_type - selects the richest iommu_type (v2 first) |
| */ |
| static int vfio_get_iommu_type(VFIOContainer *container, |
| Error **errp) |
| { |
| int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, |
| VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { |
| if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { |
| return iommu_types[i]; |
| } |
| } |
| error_setg(errp, "No available IOMMU models"); |
| return -EINVAL; |
| } |
| |
| static int vfio_init_container(VFIOContainer *container, int group_fd, |
| Error **errp) |
| { |
| int iommu_type, ret; |
| |
| iommu_type = vfio_get_iommu_type(container, errp); |
| if (iommu_type < 0) { |
| return iommu_type; |
| } |
| |
| ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd); |
| if (ret) { |
| error_setg_errno(errp, errno, "Failed to set group container"); |
| return -errno; |
| } |
| |
| while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) { |
| if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { |
| /* |
| * On sPAPR, despite the IOMMU subdriver always advertises v1 and |
| * v2, the running platform may not support v2 and there is no |
| * way to guess it until an IOMMU group gets added to the container. |
| * So in case it fails with v2, try v1 as a fallback. |
| */ |
| iommu_type = VFIO_SPAPR_TCE_IOMMU; |
| continue; |
| } |
| error_setg_errno(errp, errno, "Failed to set iommu for container"); |
| return -errno; |
| } |
| |
| container->iommu_type = iommu_type; |
| return 0; |
| } |
| |
| static int vfio_get_iommu_info(VFIOContainer *container, |
| struct vfio_iommu_type1_info **info) |
| { |
| |
| size_t argsz = sizeof(struct vfio_iommu_type1_info); |
| |
| *info = g_new0(struct vfio_iommu_type1_info, 1); |
| again: |
| (*info)->argsz = argsz; |
| |
| if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) { |
| g_free(*info); |
| *info = NULL; |
| return -errno; |
| } |
| |
| if (((*info)->argsz > argsz)) { |
| argsz = (*info)->argsz; |
| *info = g_realloc(*info, argsz); |
| goto again; |
| } |
| |
| return 0; |
| } |
| |
| static struct vfio_info_cap_header * |
| vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) |
| { |
| struct vfio_info_cap_header *hdr; |
| void *ptr = info; |
| |
| if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { |
| return NULL; |
| } |
| |
| for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { |
| if (hdr->id == id) { |
| return hdr; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static void vfio_get_iommu_info_migration(VFIOContainer *container, |
| struct vfio_iommu_type1_info *info) |
| { |
| struct vfio_info_cap_header *hdr; |
| struct vfio_iommu_type1_info_cap_migration *cap_mig; |
| |
| hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION); |
| if (!hdr) { |
| return; |
| } |
| |
| cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration, |
| header); |
| |
| /* |
| * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of |
| * qemu_real_host_page_size to mark those dirty. |
| */ |
| if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) { |
| container->dirty_pages_supported = true; |
| container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size; |
| container->dirty_pgsizes = cap_mig->pgsize_bitmap; |
| } |
| } |
| |
| static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, |
| Error **errp) |
| { |
| VFIOContainer *container; |
| int ret, fd; |
| VFIOAddressSpace *space; |
| |
| space = vfio_get_address_space(as); |
| |
| /* |
| * VFIO is currently incompatible with discarding of RAM insofar as the |
| * madvise to purge (zap) the page from QEMU's address space does not |
| * interact with the memory API and therefore leaves stale virtual to |
| * physical mappings in the IOMMU if the page was previously pinned. We |
| * therefore set discarding broken for each group added to a container, |
| * whether the container is used individually or shared. This provides |
| * us with options to allow devices within a group to opt-in and allow |
| * discarding, so long as it is done consistently for a group (for instance |
| * if the device is an mdev device where it is known that the host vendor |
| * driver will never pin pages outside of the working set of the guest |
| * driver, which would thus not be discarding candidates). |
| * |
| * The first opportunity to induce pinning occurs here where we attempt to |
| * attach the group to existing containers within the AddressSpace. If any |
| * pages are already zapped from the virtual address space, such as from |
| * previous discards, new pinning will cause valid mappings to be |
| * re-established. Likewise, when the overall MemoryListener for a new |
| * container is registered, a replay of mappings within the AddressSpace |
| * will occur, re-establishing any previously zapped pages as well. |
| * |
| * Especially virtio-balloon is currently only prevented from discarding |
| * new memory, it will not yet set ram_block_discard_set_required() and |
| * therefore, neither stops us here or deals with the sudden memory |
| * consumption of inflated memory. |
| * |
| * We do support discarding of memory coordinated via the RamDiscardManager |
| * with some IOMMU types. vfio_ram_block_discard_disable() handles the |
| * details once we know which type of IOMMU we are using. |
| */ |
| |
| QLIST_FOREACH(container, &space->containers, next) { |
| if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { |
| ret = vfio_ram_block_discard_disable(container, true); |
| if (ret) { |
| error_setg_errno(errp, -ret, |
| "Cannot set discarding of RAM broken"); |
| if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, |
| &container->fd)) { |
| error_report("vfio: error disconnecting group %d from" |
| " container", group->groupid); |
| } |
| return ret; |
| } |
| group->container = container; |
| QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
| vfio_kvm_device_add_group(group); |
| return 0; |
| } |
| } |
| |
| fd = qemu_open_old("/dev/vfio/vfio", O_RDWR); |
| if (fd < 0) { |
| error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio"); |
| ret = -errno; |
| goto put_space_exit; |
| } |
| |
| ret = ioctl(fd, VFIO_GET_API_VERSION); |
| if (ret != VFIO_API_VERSION) { |
| error_setg(errp, "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; |
| container->error = NULL; |
| container->dirty_pages_supported = false; |
| container->dma_max_mappings = 0; |
| QLIST_INIT(&container->giommu_list); |
| QLIST_INIT(&container->hostwin_list); |
| QLIST_INIT(&container->vrdl_list); |
| |
| ret = vfio_init_container(container, group->fd, errp); |
| if (ret) { |
| goto free_container_exit; |
| } |
| |
| ret = vfio_ram_block_discard_disable(container, true); |
| if (ret) { |
| error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken"); |
| goto free_container_exit; |
| } |
| |
| switch (container->iommu_type) { |
| case VFIO_TYPE1v2_IOMMU: |
| case VFIO_TYPE1_IOMMU: |
| { |
| struct vfio_iommu_type1_info *info; |
| |
| ret = vfio_get_iommu_info(container, &info); |
| if (ret) { |
| error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info"); |
| goto enable_discards_exit; |
| } |
| |
| if (info->flags & VFIO_IOMMU_INFO_PGSIZES) { |
| container->pgsizes = info->iova_pgsizes; |
| } else { |
| container->pgsizes = qemu_real_host_page_size(); |
| } |
| |
| if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) { |
| container->dma_max_mappings = 65535; |
| } |
| vfio_get_iommu_info_migration(container, info); |
| g_free(info); |
| |
| /* |
| * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE |
| * information to get the actual window extent rather than assume |
| * a 64-bit IOVA address space. |
| */ |
| vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes); |
| |
| break; |
| } |
| case VFIO_SPAPR_TCE_v2_IOMMU: |
| case VFIO_SPAPR_TCE_IOMMU: |
| { |
| struct vfio_iommu_spapr_tce_info info; |
| bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU; |
| |
| /* |
| * 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. |
| */ |
| if (!v2) { |
| ret = ioctl(fd, VFIO_IOMMU_ENABLE); |
| if (ret) { |
| error_setg_errno(errp, errno, "failed to enable container"); |
| ret = -errno; |
| goto enable_discards_exit; |
| } |
| } else { |
| container->prereg_listener = vfio_prereg_listener; |
| |
| memory_listener_register(&container->prereg_listener, |
| &address_space_memory); |
| if (container->error) { |
| memory_listener_unregister(&container->prereg_listener); |
| ret = -1; |
| error_propagate_prepend(errp, container->error, |
| "RAM memory listener initialization failed: "); |
| goto enable_discards_exit; |
| } |
| } |
| |
| info.argsz = sizeof(info); |
| ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info); |
| if (ret) { |
| error_setg_errno(errp, errno, |
| "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed"); |
| ret = -errno; |
| if (v2) { |
| memory_listener_unregister(&container->prereg_listener); |
| } |
| goto enable_discards_exit; |
| } |
| |
| if (v2) { |
| container->pgsizes = info.ddw.pgsizes; |
| /* |
| * There is a default window in just created container. |
| * To make region_add/del simpler, we better remove this |
| * window now and let those iommu_listener callbacks |
| * create/remove them when needed. |
| */ |
| ret = vfio_spapr_remove_window(container, info.dma32_window_start); |
| if (ret) { |
| error_setg_errno(errp, -ret, |
| "failed to remove existing window"); |
| goto enable_discards_exit; |
| } |
| } else { |
| /* The default table uses 4K pages */ |
| container->pgsizes = 0x1000; |
| vfio_host_win_add(container, info.dma32_window_start, |
| info.dma32_window_start + |
| info.dma32_window_size - 1, |
| 0x1000); |
| } |
| } |
| } |
| |
| vfio_kvm_device_add_group(group); |
| |
| QLIST_INIT(&container->group_list); |
| QLIST_INSERT_HEAD(&space->containers, container, next); |
| |
| group->container = container; |
| QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
| |
| container->listener = vfio_memory_listener; |
| |
| memory_listener_register(&container->listener, container->space->as); |
| |
| if (container->error) { |
| ret = -1; |
| error_propagate_prepend(errp, container->error, |
| "memory listener initialization failed: "); |
| goto listener_release_exit; |
| } |
| |
| container->initialized = true; |
| |
| return 0; |
| listener_release_exit: |
| QLIST_REMOVE(group, container_next); |
| QLIST_REMOVE(container, next); |
| vfio_kvm_device_del_group(group); |
| vfio_listener_release(container); |
| |
| enable_discards_exit: |
| vfio_ram_block_discard_disable(container, false); |
| |
| 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; |
| |
| QLIST_REMOVE(group, container_next); |
| group->container = NULL; |
| |
| /* |
| * Explicitly release the listener first before unset container, |
| * since unset may destroy the backend container if it's the last |
| * group. |
| */ |
| if (QLIST_EMPTY(&container->group_list)) { |
| vfio_listener_release(container); |
| } |
| |
| if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { |
| error_report("vfio: error disconnecting group %d from container", |
| group->groupid); |
| } |
| |
| if (QLIST_EMPTY(&container->group_list)) { |
| VFIOAddressSpace *space = container->space; |
| VFIOGuestIOMMU *giommu, *tmp; |
| VFIOHostDMAWindow *hostwin, *next; |
| |
| QLIST_REMOVE(container, next); |
| |
| QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) { |
| memory_region_unregister_iommu_notifier( |
| MEMORY_REGION(giommu->iommu_mr), &giommu->n); |
| QLIST_REMOVE(giommu, giommu_next); |
| g_free(giommu); |
| } |
| |
| QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next, |
| next) { |
| QLIST_REMOVE(hostwin, hostwin_next); |
| g_free(hostwin); |
| } |
| |
| 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, Error **errp) |
| { |
| 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_setg(errp, "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_old(path, O_RDWR); |
| if (group->fd < 0) { |
| error_setg_errno(errp, errno, "failed to open %s", path); |
| goto free_group_exit; |
| } |
| |
| if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { |
| error_setg_errno(errp, errno, "failed to get group %d status", groupid); |
| goto close_fd_exit; |
| } |
| |
| if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { |
| error_setg(errp, "group %d is not viable", groupid); |
| error_append_hint(errp, |
| "Please ensure all devices within the iommu_group " |
| "are bound to their vfio bus driver.\n"); |
| goto close_fd_exit; |
| } |
| |
| group->groupid = groupid; |
| QLIST_INIT(&group->device_list); |
| |
| if (vfio_connect_container(group, as, errp)) { |
| error_prepend(errp, "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); |
| |
| 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; |
| } |
| |
| if (!group->ram_block_discard_allowed) { |
| vfio_ram_block_discard_disable(group->container, false); |
| } |
| 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, Error **errp) |
| { |
| 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_setg_errno(errp, errno, "error getting device from group %d", |
| group->groupid); |
| error_append_hint(errp, |
| "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_setg_errno(errp, errno, "error getting device info"); |
| close(fd); |
| return ret; |
| } |
| |
| /* |
| * Set discarding of RAM as not broken for this group if the driver knows |
| * the device operates compatibly with discarding. Setting must be |
| * consistent per group, but since compatibility is really only possible |
| * with mdev currently, we expect singleton groups. |
| */ |
| if (vbasedev->ram_block_discard_allowed != |
| group->ram_block_discard_allowed) { |
| if (!QLIST_EMPTY(&group->device_list)) { |
| error_setg(errp, "Inconsistent setting of support for discarding " |
| "RAM (e.g., balloon) within group"); |
| close(fd); |
| return -1; |
| } |
| |
| if (!group->ram_block_discard_allowed) { |
| group->ram_block_discard_allowed = true; |
| vfio_ram_block_discard_disable(group->container, false); |
| } |
| } |
| |
| 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; |
| retry: |
| (*info)->argsz = argsz; |
| |
| if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) { |
| g_free(*info); |
| *info = NULL; |
| return -errno; |
| } |
| |
| if ((*info)->argsz > argsz) { |
| argsz = (*info)->argsz; |
| *info = g_realloc(*info, argsz); |
| |
| goto retry; |
| } |
| |
| return 0; |
| } |
| |
| int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type, |
| uint32_t subtype, struct vfio_region_info **info) |
| { |
| int i; |
| |
| for (i = 0; i < vbasedev->num_regions; i++) { |
| struct vfio_info_cap_header *hdr; |
| struct vfio_region_info_cap_type *cap_type; |
| |
| if (vfio_get_region_info(vbasedev, i, info)) { |
| continue; |
| } |
| |
| hdr = vfio_get_region_info_cap(*info, VFIO_REGION_INFO_CAP_TYPE); |
| if (!hdr) { |
| g_free(*info); |
| continue; |
| } |
| |
| cap_type = container_of(hdr, struct vfio_region_info_cap_type, header); |
| |
| trace_vfio_get_dev_region(vbasedev->name, i, |
| cap_type->type, cap_type->subtype); |
| |
| if (cap_type->type == type && cap_type->subtype == subtype) { |
| return 0; |
| } |
| |
| g_free(*info); |
| } |
| |
| *info = NULL; |
| return -ENODEV; |
| } |
| |
| bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type) |
| { |
| struct vfio_region_info *info = NULL; |
| bool ret = false; |
| |
| if (!vfio_get_region_info(vbasedev, region, &info)) { |
| if (vfio_get_region_info_cap(info, cap_type)) { |
| ret = true; |
| } |
| g_free(info); |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * 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 ret; |
| } |
| |
| 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); |
| } |