The vring buffer is communication block between guest and hypervisor,
allocate the vring buffer using AllocateSharedPages() so that it can be
Map() with BusMasterCommonBufer for bi-directional access.
Cc: Ard Biesheuvel <ard.biesheu...@linaro.org>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
---
OvmfPkg/Library/VirtioLib/VirtioLib.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/OvmfPkg/Library/VirtioLib/VirtioLib.c
b/OvmfPkg/Library/VirtioLib/VirtioLib.c
index 09a3f9b7f2e5..9ba64204326f 100644
--- a/OvmfPkg/Library/VirtioLib/VirtioLib.c
+++ b/OvmfPkg/Library/VirtioLib/VirtioLib.c
@@ -61,6 +61,7 @@ VirtioRingInit (
OUT VRING *Ring
)
{
+ EFI_STATUS Status;
UINTN RingSize;
volatile UINT8 *RingPagesPtr;
@@ -79,9 +80,12 @@ VirtioRingInit (
sizeof *Ring->Used.AvailEvent,
EFI_PAGE_SIZE);
+ //
+ // Allocate a shared ring buffer
+ //
Ring->NumPages = EFI_SIZE_TO_PAGES (RingSize);
- Ring->Base = AllocatePages (Ring->NumPages);
- if (Ring->Base == NULL) {
+ Status = VirtioAllocateSharedPages (VirtIo, Ring->NumPages, &Ring->Base);
+ if (EFI_ERROR (Status)) {
return EFI_OUT_OF_RESOURCES;
}
SetMem (Ring->Base, RingSize, 0x00);
@@ -143,7 +147,7 @@ VirtioRingUninit (
IN OUT VRING *Ring
)
{
- FreePages (Ring->Base, Ring->NumPages);
+ VirtioFreeSharedPages (VirtIo, Ring->NumPages, Ring->Base);
SetMem (Ring, sizeof *Ring, 0x00);
}
--
2.7.4
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