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charset="utf-8" When SEV is enabled, use a bounce buffer to perform the DMA operation. Cc: Jordan Justen Cc: Laszlo Ersek Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Brijesh Singh Reviewed-by: Laszlo Ersek --- OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c | 54 +++++++++++++++++++- 1 file changed, 52 insertions(+), 2 deletions(-) diff --git a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c b/OvmfPkg/Library/= QemuFwCfgLib/QemuFwCfgLib.c index 73a19772bee1..40b43ac78ff4 100644 --- a/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c +++ b/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c @@ -72,6 +72,8 @@ InternalQemuFwCfgDmaBytes ( volatile FW_CFG_DMA_ACCESS *Access; UINT32 AccessHigh, AccessLow; UINT32 Status; + UINT32 NumPages; + VOID *DmaBuffer, *BounceBuffer; =20 ASSERT (Control =3D=3D FW_CFG_DMA_CTL_WRITE || Control =3D=3D FW_CFG_DMA= _CTL_READ || Control =3D=3D FW_CFG_DMA_CTL_SKIP); @@ -80,11 +82,44 @@ InternalQemuFwCfgDmaBytes ( return; } =20 - Access =3D &LocalAccess; + // + // When SEV is enabled then allocate DMA bounce buffer + // + if (InternalQemuFwCfgSevIsEnabled ()) { + UINTN TotalSize; + + TotalSize =3D sizeof (*Access); + // + // Control operation does not need buffer + // + if (Control !=3D FW_CFG_DMA_CTL_SKIP) { + TotalSize +=3D Size; + } + + // + // Allocate SEV DMA buffer + // + NumPages =3D (UINT32)EFI_SIZE_TO_PAGES (TotalSize); + InternalQemuFwCfgSevDmaAllocateBuffer (&BounceBuffer, NumPages); + + Access =3D BounceBuffer; + DmaBuffer =3D (UINT8*)BounceBuffer + sizeof (*Access); + + // + // Decrypt data from encrypted guest buffer into DMA buffer + // + if (Control =3D=3D FW_CFG_DMA_CTL_WRITE) { + CopyMem (DmaBuffer, Buffer, Size); + } + } else { + Access =3D &LocalAccess; + DmaBuffer =3D Buffer; + BounceBuffer =3D NULL; + } =20 Access->Control =3D SwapBytes32 (Control); Access->Length =3D SwapBytes32 (Size); - Access->Address =3D SwapBytes64 ((UINTN)Buffer); + Access->Address =3D SwapBytes64 ((UINTN)DmaBuffer); =20 // // Delimit the transfer from (a) modifications to Access, (b) in case of= a @@ -117,6 +152,21 @@ InternalQemuFwCfgDmaBytes ( // After a read, the caller will want to use Buffer. // MemoryFence (); + + // + // If Bounce buffer was allocated then copy the data into guest buffer a= nd + // free the bounce buffer + // + if (BounceBuffer) { + // + // Encrypt the data from DMA buffer into guest buffer + // + if (Control =3D=3D FW_CFG_DMA_CTL_READ) { + CopyMem (Buffer, DmaBuffer, Size); + } + + InternalQemuFwCfgSevDmaFreeBuffer (BounceBuffer, NumPages); + } } =20 =20 --=20 2.7.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel