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OvmfPkg: VirtioBlkDxe: don't clear non-negotiable feature bits 

VirtioBlkDxe only recognizes virtio-block feature bits that the device
offers non-negotiably. Nonetheless, in preparation for the following
patches, don't try to clear them even for simplicity.

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>
This commit is contained in:
Laszlo Ersek 2016-03-12 01:47:04 +01:00
parent 07af4eee93
commit 0c2a486078
1 changed files with 4 additions and 5 deletions
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9
OvmfPkg/VirtioBlkDxe/VirtioBlk.c
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@ -737,12 +737,11 @@ VirtioBlkInit (
//
// step 5 -- Report understood features. There are no virtio-blk specific
// features to negotiate in virtio-0.9.5, plus we do not want any of the
// device-independent (known or unknown) VIRTIO_F_* capabilities (see
// Appendix B).
// step 5 -- Report understood features.
//
Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, 0);
Features &= VIRTIO_BLK_F_BLK_SIZE | VIRTIO_BLK_F_TOPOLOGY | VIRTIO_BLK_F_RO |
VIRTIO_BLK_F_FLUSH;
Status = Dev->VirtIo->SetGuestFeatures (Dev->VirtIo, Features);
if (EFI_ERROR (Status)) {
goto ReleaseQueue;
}