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OvmfPkg: Create a calling area used to communicate with the SVSM

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

An SVSM requires a calling area page whose address (CAA) is used by the
SVSM to communicate and process the SVSM request.

Add a pre-defined page area to the OvmfPkg and AmdSev packages and define
corresponding PCDs used to communicate the location and size of the area.
Keep the AmdSev package in sync with the OvmfPkg and adjust the AmdSev
launch and hash area memory locations.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Min Xu <min.m.xu@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky
2024-03-08 07:32:16 -08:00
committed by mergify[bot]
parent f6bf37c171
commit 5a67a2efa7
8 changed files with 42 additions and 6 deletions
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4
OvmfPkg/OvmfPkg.dec
View File

@@ -338,6 +338,10 @@
## Restrict boot to EFI applications in firmware volumes.
gUefiOvmfPkgTokenSpaceGuid.PcdBootRestrictToFirmware|FALSE|BOOLEAN|0x6c
## The base address and size of the initial SVSM Calling Area.
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecSvsmCaaBase|0|UINT32|0x70
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecSvsmCaaSize|0|UINT32|0x71
[PcdsDynamic, PcdsDynamicEx]
gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10