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OvmfPkg/VirtioRngDxe: negotiate VIRTIO_F_IOMMU_PLATFORM 

VirtioRngDxe driver has been updated to use IOMMU-like member functions
from VIRTIO_DEVICE_PROTOCOL to translate the system physical address to
device address. We do not need to do anything special when
VIRTIO_F_IOMMU_PLATFORM bit is present hence treat it in parallel with
VIRTIO_F_VERSION_1.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Brijesh Singh 2017-08-25 06:37:47 -04:00 committed by Laszlo Ersek
parent 4fb268029e
commit 4bef13da00
1 changed files with 2 additions and 2 deletions
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4
OvmfPkg/VirtioRngDxe/VirtioRng.c
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@ -279,7 +279,7 @@ VirtioRngInit (
goto Failed;
}
Features &= VIRTIO_F_VERSION_1;
Features &= VIRTIO_F_VERSION_1 | VIRTIO_F_IOMMU_PLATFORM;
//
// In virtio-1.0, feature negotiation is expected to complete before queue
@ -360,7 +360,7 @@ VirtioRngInit (
// step 5 -- Report understood features and guest-tuneables.
//
if (Dev->VirtIo->Revision < VIRTIO_SPEC_REVISION (1, 0, 0)) {
Features &= ~(UINT64)VIRTIO_F_VERSION_1;
Features &= ~(UINT64)(VIRTIO_F_VERSION_1 | VIRTIO_F_IOMMU_PLATFORM);
Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, Features);
if (EFI_ERROR (Status)) {
goto UnmapQueue;