diff options
| author | Peter Xu <peterx@redhat.com> | 2018-12-17 15:31:12 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2018-12-19 16:48:16 -0500 |
| commit | ccc23bb08a84f3709b08cc10ffd4e819832fae6d (patch) | |
| tree | 5bfcce0fb1b9f10714940bf1ce638693c1b7b0be /include/hw/i386/intel_iommu.h | |
| parent | 095955b24d25715f38b78703dc0a295761bffaca (diff) | |
| download | focaccia-qemu-ccc23bb08a84f3709b08cc10ffd4e819832fae6d.tar.gz focaccia-qemu-ccc23bb08a84f3709b08cc10ffd4e819832fae6d.zip | |
intel_iommu: dma read/write draining support
Support DMA read/write draining should be easy for existing VT-d
emulation since the emulation itself does not have any request queue
there so we don't need to do anything to flush the un-commited queue.
What we need to do is to declare the support.
These capabilities are required to pass Windows SVVP test program. It
is verified that when with parameters "x-aw-bits=48,caching-mode=off"
we can pass the Windows SVVP test with this patch applied. Otherwise
we'll fail with:
IOMMU[0] - DWD (DMA write draining) not supported
IOMMU[0] - DWD (DMA read draining) not supported
Segment 0 has no DMA remapping capable IOMMU units
However since these bits are not declared support for QEMU<=3.1, we'll
need a compatibility bit for it and we turn this on by default only
for QEMU>=4.0.
Please refer to VT-d spec 6.5.4 for more information.
CC: Yu Wang <wyu@redhat.com>
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1654550
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/hw/i386/intel_iommu.h')
| -rw-r--r-- | include/hw/i386/intel_iommu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h index ed4e758273..a321cc9691 100644 --- a/include/hw/i386/intel_iommu.h +++ b/include/hw/i386/intel_iommu.h @@ -245,6 +245,7 @@ struct IntelIOMMUState { OnOffAuto intr_eim; /* Toggle for EIM cabability */ bool buggy_eim; /* Force buggy EIM unless eim=off */ uint8_t aw_bits; /* Host/IOVA address width (in bits) */ + bool dma_drain; /* Whether DMA r/w draining enabled */ /* * Protects IOMMU states in general. Currently it protects the |