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| author | Laszlo Ersek <lersek@redhat.com> | 2016-03-12 14:41:26 +0100 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2016-04-06 19:21:50 +0200 |
| commit | 39c2d339621bf1bdcb31a5501379e76996ed6bf6 (patch) | |
| tree | e8b236a297845fcaa436727d254d3afcb0a46caf /OvmfPkg | |
| parent | 0a781bdc7f87f87b8c3ef57c2837f116daa8b580 (diff) | |
| download | edk2-39c2d339621bf1bdcb31a5501379e76996ed6bf6.tar.gz edk2-39c2d339621bf1bdcb31a5501379e76996ed6bf6.tar.bz2 edk2-39c2d339621bf1bdcb31a5501379e76996ed6bf6.zip | |
OvmfPkg: VirtioScsiDxe: adapt feature negotiation to virtio-1.0
Relative to virtio-0.9.5, virtio-1.0 reverses the order of queue discovery
and feature negotiation. In virtio-1.0, feature negotiation has to
complete first, and the device can also reject a self-inconsistent feature
request through the new VSTAT_FEATURES_OK status bit. (For example if the
driver requests a higher level feature but clears a prerequisite feature.)
Furthermore, we retain the VIRTIO_F_VERSION_1 feature bit if the
VIRTIO_DEVICE_PROTOCOL provider has high enough revision.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Diffstat (limited to 'OvmfPkg')
| -rw-r--r-- | OvmfPkg/VirtioScsiDxe/VirtioScsi.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/OvmfPkg/VirtioScsiDxe/VirtioScsi.c b/OvmfPkg/VirtioScsiDxe/VirtioScsi.c index 162577bcb9..c080404330 100644 --- a/OvmfPkg/VirtioScsiDxe/VirtioScsi.c +++ b/OvmfPkg/VirtioScsiDxe/VirtioScsi.c @@ -800,6 +800,19 @@ VirtioScsiInit ( goto Failed;
}
+ Features &= VIRTIO_SCSI_F_INOUT | 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
//
@@ -847,14 +860,14 @@ VirtioScsiInit ( }
//
- // step 5 -- Report understood features and guest-tuneables. We want none of
- // the known (or unknown) VIRTIO_SCSI_F_* or VIRTIO_F_* capabilities (see
- // virtio-0.9.5, Appendices B and I), except bidirectional transfers.
+ // step 5 -- Report understood features and guest-tuneables.
//
- Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo,
- Features & VIRTIO_SCSI_F_INOUT);
- 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;
+ }
}
//
|