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 <[email protected]> Cc: Jordan Justen <[email protected]> Cc: Tom Lendacky <[email protected]> Cc: Laszlo Ersek <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <[email protected]> --- 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 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
