diff options
| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2020-10-30 19:05:10 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-11-03 16:39:05 -0500 |
| commit | 1b296c3def4b9b63d2fdbce6646edd108a3e616c (patch) | |
| tree | 4641ac050f0430c0018bac7c1e1d6998d57f6cc3 /hw/vfio/common.c | |
| parent | 5c3cfe33f4185841feaedd07bea1d6d7e02011a0 (diff) | |
vfio: Don't issue full 2^64 unmap
IOMMUs may declare memory regions spanning from 0 to UINT64_MAX. When
attempting to deal with such region, vfio_listener_region_del() passes a
size of 2^64 to int128_get64() which throws an assertion failure. Even
ignoring this, the VFIO_IOMMU_DMA_MAP ioctl cannot handle this size
since the size field is 64-bit. Split the request in two.
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Message-Id: <20201030180510.747225-11-jean-philippe@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/vfio/common.c')
| -rw-r--r-- | hw/vfio/common.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 35895b18a6..c1fdbf17f2 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -950,6 +950,17 @@ static void vfio_listener_region_del(MemoryListener *listener, } 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", " |