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OvmfPkg/QemuFwCfgLib: Implement SEV internal function for Dxe phase

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When SEV is enabled, the DMA must be performed on unencrypted pages.
So when get asked to perfom FWCFG DMA read or write, we allocate a
intermediate (bounce buffer) unencrypted buffer and use this buffer
for DMA read or write.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Brijesh Singh
2017-07-06 09:29:08 -04:00
committed by Jordan Justen
parent 5feae25392
commit 09719a01b1
2 changed files with 121 additions and 0 deletions
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7
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgDxeLib.inf
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@@ -39,6 +39,7 @@
[Packages]
MdePkg/MdePkg.dec
MdeModulePkg/MdeModulePkg.dec
OvmfPkg/OvmfPkg.dec
[LibraryClasses]
@@ -47,4 +48,10 @@
DebugLib
IoLib
MemoryAllocationLib
MemEncryptSevLib
[Protocols]
gEdkiiIoMmuProtocolGuid ## SOMETIMES_CONSUMES
[Depex]
gEdkiiIoMmuProtocolGuid OR gIoMmuAbsentProtocolGuid