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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>
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| .. | ||
| kvm | ||
| xen | ||
| acpi-build.c | ||
| acpi-build.h | ||
| amd_iommu.c | ||
| amd_iommu.h | ||
| intel_iommu.c | ||
| intel_iommu_internal.h | ||
| kvmvapic.c | ||
| Makefile.objs | ||
| multiboot.c | ||
| multiboot.h | ||
| pc.c | ||
| pc_piix.c | ||
| pc_q35.c | ||
| pc_sysfw.c | ||
| trace-events | ||
| vmmouse.c | ||
| vmport.c | ||
| x86-iommu.c | ||