On Mon, Dec 13, 2021 at 08:56:58PM +0800, Min Xu wrote: > RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 > > The IOMMU protocol driver provides capabilities to set a DMA access > attribute and methods to allocate, free, map and unmap the DMA memory > for the PCI Bus devices. > > The current IoMmuDxe driver supports DMA operations inside SEV guest. > To support DMA operation in TDX guest, > CC_GUEST_IS_XXX (PcdConfidentialComputingGuestAttr) is used to determine > if it is SEV guest or TDX guest. > > Due to security reasons all DMA operations inside the SEV/TDX guest must > be performed on shared pages. The IOMMU protocol driver for the SEV/TDX > guest uses a bounce buffer to map guest DMA buffer to shared pages in > order to provide the support for DMA operations inside SEV/TDX guest. > > The call of SEV or TDX specific function to set/clear EncMask/SharedBit > is determined by CC_GUEST_IS_XXX (PcdConfidentialComputingGuestAttr). > > Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org> > Cc: Jordan Justen <jordan.l.jus...@intel.com> > Cc: Brijesh Singh <brijesh.si...@amd.com> > Cc: Erdem Aktas <erdemak...@google.com> > Cc: James Bottomley <j...@linux.ibm.com> > Cc: Jiewen Yao <jiewen....@intel.com> > Cc: Tom Lendacky <thomas.lenda...@amd.com> > Cc: Gerd Hoffmann <kra...@redhat.com> > Signed-off-by: Min Xu <min.m...@intel.com>
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