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20:YbXZCHMJIVuPXZe0qO2cPsEL8tsssPD+YKVtW3W7G2ockmzaBsEDqcJd8xFjiCWuFRJ1A2IGuXTtbhXLFiXpVjsbP1HTV0SdGja4dTCNfpigU8Hs6/ywVt2AUdIunawa8HfwDJwMLzrkRwR2nklTbcuvaVbvqo043nfxPzOTb/ZhniEGfUg5PgrtN/bq5ve5Ck12QpC2rxYGIY1TIyniyYiEJTKVSapSUlUBbIhm7AEtA/pIcdiHvJ72+nXqpCB9 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 May 2017 22:09:53.0522 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR12MB0149 Subject: [edk2] [RFC v4 13/13] OvmfPkg/QemuFwCfgLib: Add SEV support X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas.Lendacky@amd.com, leo.duran@amd.com, Laszlo Ersek , Jordan Justen Content-Transfer-Encoding: quoted-printable Errors-To: edk2-devel-bounces@lists.01.org Sender: "edk2-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_4 Z_629925259 SPT_0 Content-Type: text/plain; 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 --- 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..86d8bf880e71 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 ()) { + UINT32 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 bounce buffer + // + NumPages =3D EFI_SIZE_TO_PAGES (TotalSize); + InternalQemuFwCfgSevDmaAllocateBuffer (NumPages, &BounceBuffer); + + Access =3D BounceBuffer; + DmaBuffer =3D BounceBuffer + sizeof (*Access); + + // + // Copy data from Host buffer into DMA buffer + // + if (Buffer && 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 host buffer and + // free the bounce buffer + // + if (BounceBuffer) { + // + // Copy data from DMA buffer into host buffer + // + if (Buffer && 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