Branch: refs/heads/master
Home: https://github.com/tianocore/edk2
Commit: 856bdc8eec0fd450ffb582808ad9649a5d02b480
https://github.com/tianocore/edk2/commit/856bdc8eec0fd450ffb582808ad9649a5d02b480
Author: Tom Lendacky <[email protected]>
Date: 2025-04-26 (Sat, 26 Apr 2025)
Changed paths:
M OvmfPkg/Library/CcExitLib/CcExitVcHandler.c
Log Message:
-----------
OvmfPkg/CcExitLib: Use the proper register when filtering MSRs
The MsrExit() routine uses an incorrect register to check for the CAA MSR.
Instead of checking RCX, the input register for RDMSR/WRMSR that holds the
MSR value, it is checking RAX, which results in failure to detect the CAA
MSR request. The check should only be checking the lower 32-bits of the
register (ECX), too.
Change the check in MsrExit() to check the MSR value contained in ECX.
Fixes: 47001ab98914 ("Ovmfpkg/CcExitLib: Provide SVSM discovery support")
Signed-off-by: Tom Lendacky <[email protected]>
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