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OvmfPkg/VirtioLib: alloc VRING buffer with AllocateSharedPages() 

The VRING buffer is a communication area between guest and hypervisor.
Allocate it using VIRTIO_DEVICE_PROTOCOL.AllocateSharedPages() so that
it can be mapped later with VirtioRingMap() for bi-directional access.

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: correct typo in VirtioRingInit() comment blocks]
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Brijesh Singh 2017-08-23 06:57:18 -04:00 committed by Laszlo Ersek
parent fef6becb55
commit b0338c5329
3 changed files with 16 additions and 12 deletions
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5
OvmfPkg/Include/Library/VirtioLib.h
View File

@ -42,9 +42,8 @@
@param[out] Ring The virtio ring to set up.
@retval EFI_OUT_OF_RESOURCES AllocatePages() failed to allocate contiguous
pages for the requested QueueSize. Fields of
Ring have indeterminate value.
@return Status codes propagated from
VirtIo->AllocateSharedPages().
@retval EFI_SUCCESS Allocation and setup successful. Ring->Base
(and nothing else) is responsible for

22
OvmfPkg/Library/VirtioLib/VirtioLib.c
View File

@ -19,7 +19,6 @@
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/VirtioLib.h>
@ -44,9 +43,8 @@
@param[out] Ring The virtio ring to set up.
@retval EFI_OUT_OF_RESOURCES AllocatePages() failed to allocate contiguous
pages for the requested QueueSize. Fields of
Ring have indeterminate value.
@return Status codes propagated from
VirtIo->AllocateSharedPages().
@retval EFI_SUCCESS Allocation and setup successful. Ring->Base
(and nothing else) is responsible for
@ -61,6 +59,7 @@ VirtioRingInit (
OUT VRING *Ring
)
{
EFI_STATUS Status;
UINTN RingSize;
volatile UINT8 *RingPagesPtr;
@ -79,10 +78,17 @@ 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) {
return EFI_OUT_OF_RESOURCES;
Status = VirtIo->AllocateSharedPages (
VirtIo,
Ring->NumPages,
&Ring->Base
);
if (EFI_ERROR (Status)) {
return Status;
}
SetMem (Ring->Base, RingSize, 0x00);
RingPagesPtr = Ring->Base;
@ -143,7 +149,7 @@ VirtioRingUninit (
IN OUT VRING *Ring
)
{
FreePages (Ring->Base, Ring->NumPages);
VirtIo->FreeSharedPages (VirtIo, Ring->NumPages, Ring->Base);
SetMem (Ring, sizeof *Ring, 0x00);
}

1
OvmfPkg/Library/VirtioLib/VirtioLib.inf
View File

@ -32,5 +32,4 @@
BaseLib
BaseMemoryLib
DebugLib
MemoryAllocationLib
UefiBootServicesTableLib