diff options
Diffstat (limited to 'hw/vfio/container-legacy.c')
| -rw-r--r-- | hw/vfio/container-legacy.c | 28 |
1 files changed, 5 insertions, 23 deletions
diff --git a/hw/vfio/container-legacy.c b/hw/vfio/container-legacy.c index c0540f2bdc..629ff23b0b 100644 --- a/hw/vfio/container-legacy.c +++ b/hw/vfio/container-legacy.c @@ -69,7 +69,7 @@ static int vfio_ram_block_discard_disable(VFIOLegacyContainer *container, } static int vfio_dma_unmap_bitmap(const VFIOLegacyContainer *container, - hwaddr iova, ram_addr_t size, + hwaddr iova, uint64_t size, IOMMUTLBEntry *iotlb) { const VFIOContainer *bcontainer = VFIO_IOMMU(container); @@ -122,7 +122,7 @@ unmap_exit: } static int vfio_legacy_dma_unmap_one(const VFIOContainer *bcontainer, - hwaddr iova, ram_addr_t size, + hwaddr iova, uint64_t size, IOMMUTLBEntry *iotlb) { const VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); @@ -147,25 +147,7 @@ static int vfio_legacy_dma_unmap_one(const VFIOContainer *bcontainer, need_dirty_sync = true; } - 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_legacy_dma_unmap_overflow_workaround(); - unmap.size -= 1ULL << ctz64(bcontainer->pgsizes); - continue; - } + if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { return -errno; } @@ -185,7 +167,7 @@ static int vfio_legacy_dma_unmap_one(const VFIOContainer *bcontainer, * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 */ static int vfio_legacy_dma_unmap(const VFIOContainer *bcontainer, - hwaddr iova, ram_addr_t size, + hwaddr iova, uint64_t size, IOMMUTLBEntry *iotlb, bool unmap_all) { int ret; @@ -210,7 +192,7 @@ static int vfio_legacy_dma_unmap(const VFIOContainer *bcontainer, } static int vfio_legacy_dma_map(const VFIOContainer *bcontainer, hwaddr iova, - ram_addr_t size, void *vaddr, bool readonly, + uint64_t size, void *vaddr, bool readonly, MemoryRegion *mr) { const VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); |