diff options
Diffstat (limited to 'OvmfPkg/VirtioRngDxe/VirtioRng.c')
| -rw-r--r-- | OvmfPkg/VirtioRngDxe/VirtioRng.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/OvmfPkg/VirtioRngDxe/VirtioRng.c b/OvmfPkg/VirtioRngDxe/VirtioRng.c index d916534aac..1a186d0408 100644 --- a/OvmfPkg/VirtioRngDxe/VirtioRng.c +++ b/OvmfPkg/VirtioRngDxe/VirtioRng.c @@ -242,6 +242,19 @@ VirtioRngInit ( goto Failed;
}
+ Features &= VIRTIO_F_VERSION_1;
+
+ //
+ // In virtio-1.0, feature negotiation is expected to complete before queue
+ // discovery, and the device can also reject the selected set of features.
+ //
+ if (Dev->VirtIo->Revision >= VIRTIO_SPEC_REVISION (1, 0, 0)) {
+ Status = Virtio10WriteFeatures (Dev->VirtIo, Features, &NextDevStat);
+ if (EFI_ERROR (Status)) {
+ goto Failed;
+ }
+ }
+
//
// step 4b -- allocate request virtqueue, just use #0
//
@@ -290,14 +303,14 @@ VirtioRngInit ( }
//
- // step 5 -- Report understood features and guest-tuneables. None are
- // currently defined for VirtioRng, and no generic features are needed by
- // this driver.
+ // step 5 -- Report understood features and guest-tuneables.
//
- Features &= 0;
- Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, Features);
- if (EFI_ERROR (Status)) {
- goto ReleaseQueue;
+ if (Dev->VirtIo->Revision < VIRTIO_SPEC_REVISION (1, 0, 0)) {
+ Features &= ~(UINT64)VIRTIO_F_VERSION_1;
+ Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, Features);
+ if (EFI_ERROR (Status)) {
+ goto ReleaseQueue;
+ }
}
//
|