Hi Leo I do intercept 4 I/O operation in *PciIo*, instead of *PciRootBridgeIo*.
See: https://lists.01.org/pipermail/edk2-devel/2017-March/009021.html There are 4 gIoMmuProtocol->SetAttribute() I believe you can clear/set SEV action there. Would you please double check that? Thank you Yao Jiewen From: Duran, Leo [mailto:leo.du...@amd.com] Sent: Tuesday, March 28, 2017 3:51 AM To: Yao, Jiewen <jiewen....@intel.com>; edk2-devel@lists.01.org Cc: Ni, Ruiyu <ruiyu...@intel.com>; Singh, Brijesh <brijesh.si...@amd.com> Subject: RE: [RFC] [PATCH 0/3] Add IOMMU support. Hi Yao, This patch-set, in its current form, does not address all of the required SEV functionality for PcIHostBridgeIo. Basically, we need to intercept all 4 I/O Operations: - IoMap() - IoUnmap() - IoAllocateBuffer() - IoFreeBuffer() SEV I/O intercepts would do this: 1) IoMap() - Allocate an accessible bounce buffer (AllocateType depends on consumer's capabilities). - Clear SEV mask on retuned mapped DMA buffer - On DMA Read: CopyMem() from consumer buffer to mapped buffer (bounce operation) 2) IoUnmap() - On DMA Write: CopyMem() from mapped buffer to consumer buffer (bounce operation) - Restore SEV mask on mapped DMA buffer 3) IoAllocateBuffer() - Allocate an accessible buffer (AllocateType depends on consumer's capabilities). - Clear SEV mask on allocated buffer - return allocated buffer 4) IoFreeBuffer() - Restore SEV mask on allocated buffer - Free allocated buffer For an sample on how we've intercepted BmDmaLib operations, please refer to the patch-sets posted by Brijesh: https://lists.01.org/pipermail/edk2-devel/2017-March/008838.html https://lists.01.org/pipermail/edk2-devel/2017-March/008840.html Thanks, Leo > -----Original Message----- > From: Jiewen Yao [mailto:jiewen....@intel.com] > Sent: Saturday, March 25, 2017 4:29 AM > To: edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org> > Cc: Ruiyu Ni <ruiyu...@intel.com<mailto:ruiyu...@intel.com>>; Duran, Leo > <leo.du...@amd.com<mailto:leo.du...@amd.com>>; > Singh, Brijesh <brijesh.si...@amd.com<mailto:brijesh.si...@amd.com>> > Subject: [RFC] [PATCH 0/3] Add IOMMU support. > > This patch series adds IOMMU protocol and updates the consumer to > support IOMMU based DMA access in UEFI. > > This patch series can support the BmDmaLib request for AMD SEV. > submitted by Duran, Leo <leo.du...@amd.com<mailto:leo.du...@amd.com>> and > Brijesh Singh > <brijesh.ksi...@gmail.com<mailto:brijesh.ksi...@gmail.com>>. > https://lists.01.org/pipermail/edk2-devel/2017-March/008109.html, and > https://lists.01.org/pipermail/edk2-devel/2017-March/008820.html. > We can have an AMD SEV specific IOMMU driver to produce IOMMU > protocol, and clear SEV in IOMMU->SetAttribute(). > > This patch series can also support Intel VTd based DMA protection, > requested by Jiewen Yao <jiewen....@intel.com<mailto:jiewen....@intel.com>>, > discussed in > https://lists.01.org/pipermail/edk2-devel/2017-March/008157.html. > We can have an Intel VTd specific IOMMU driver to produce IOMMU > protocol, and update VTd engine to grant or deny access in IOMMU- > >SetAttribute(). > > This patch series does not provide a full Intel VTd driver, which will be > provide in other patch in the future. > > The purpose of this patch series to review if this IOMMU protocol design can > meet all DMA access and management requirement. > > Cc: Ruiyu Ni <ruiyu...@intel.com<mailto:ruiyu...@intel.com>> > Cc: Leo Duran <leo.du...@amd.com<mailto:leo.du...@amd.com>> > Cc: Brijesh Singh <brijesh.si...@amd.com<mailto:brijesh.si...@amd.com>> > Contributed-under: TianoCore Contribution Agreement 1.0 > Signed-off-by: Jiewen Yao <jiewen....@intel.com<mailto:jiewen....@intel.com>> > > > Jiewen Yao (3): > MdeModulePkg/Include: Add IOMMU protocol definition. > MdeModulePkg/PciHostBridge: Add IOMMU support. > MdeModulePkg/PciBus: Add IOMMU support. > > MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.c | 12 ++ > MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h | 10 ++ > MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf | 1 + > MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c | 100 ++++++++++++ > MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c | 3 + > MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf | 1 + > MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridge.h | 7 + > MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridgeIo.c | 172 > +++++++++++++++++++- > MdeModulePkg/Include/Protocol/IoMmu.h | 132 > +++++++++++++++ > MdeModulePkg/MdeModulePkg.dec | 3 + > 10 files changed, 436 insertions(+), 5 deletions(-) create mode 100644 > MdeModulePkg/Include/Protocol/IoMmu.h > > -- > 2.7.4.windows.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
