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| author | Brijesh Singh <brijesh.singh@amd.com> | 2017-08-23 06:57:18 -0400 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2017-08-25 10:42:19 +0200 |
| commit | fef6becb55355c2f6cf0a99f6e7e564d3165ee49 (patch) | |
| tree | 4a053f610e193a3b93976cf1240b266a6e9b6329 /OvmfPkg/Include | |
| parent | 60ee56295fb672bf5a324d4016582c88facb2ecf (diff) | |
| download | edk2-fef6becb55355c2f6cf0a99f6e7e564d3165ee49.tar.gz edk2-fef6becb55355c2f6cf0a99f6e7e564d3165ee49.tar.bz2 edk2-fef6becb55355c2f6cf0a99f6e7e564d3165ee49.zip | |
OvmfPkg/VirtioLib: add function to map VRING
Add a function to map the ring buffer with BusMasterCommonBuffer so that
ring can be accessed by both guest and hypervisor.
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>
[lersek@redhat.com: fix typo in commit message]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'OvmfPkg/Include')
| -rw-r--r-- | OvmfPkg/Include/Library/VirtioLib.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/OvmfPkg/Include/Library/VirtioLib.h b/OvmfPkg/Include/Library/VirtioLib.h index 929e00c5f7..6a422deba2 100644 --- a/OvmfPkg/Include/Library/VirtioLib.h +++ b/OvmfPkg/Include/Library/VirtioLib.h @@ -62,6 +62,32 @@ VirtioRingInit ( /**
+ Map the ring buffer so that it can be accessed equally by both guest
+ and hypervisor.
+
+ @param[in] VirtIo The virtio device instance.
+
+ @param[in] Ring The virtio ring to map.
+
+ @param[out] RingBaseShift A resulting translation offset, to be
+ passed to VirtIo->SetQueueAddress().
+
+ @param[out] Mapping A resulting token to pass to
+ VirtIo->UnmapSharedBuffer().
+
+ @return Status code from VirtIo->MapSharedBuffer()
+**/
+EFI_STATUS
+EFIAPI
+VirtioRingMap (
+ IN VIRTIO_DEVICE_PROTOCOL *VirtIo,
+ IN VRING *Ring,
+ OUT UINT64 *RingBaseShift,
+ OUT VOID **Mapping
+ );
+
+/**
+
Tear down the internal resources of a configured virtio ring.
The caller is responsible to stop the host from using this ring before
|