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authorTom Lendacky <thomas.lendacky@amd.com>2023-07-14 15:28:26 -0500
committermergify[bot] <37929162+mergify[bot]@users.noreply.github.com>2023-07-14 22:52:58 +0000
commite674096accc8e57cd0dd84679905e1222423251e (patch)
treed80b2c4dd81054c5eba0fc6ee64b06736f85039b /EmulatorPkg/EmuSnpDxe/EmuSnpDxe.h
parentff3382a51ca726a90f49623a2b2d2e8ad8459ce2 (diff)
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OvmfPkg/ResetVector: Fix assembler bit test flag check
Commit 63c50d3ff2854a76432b752af4f2a76f33ff1974 changed the check that is used to determine if SEV-ES is active. Originally, a CMP instruction with a supporting JZ instruction was used for the check. It was changed to use the BT instruction but not JZ instruction. The result of a BT instruction changes the the carry flag (CF) and not the zero flag (ZF). As a result, the wrong condition is being checked. Update the JZ to a JNC to properly detect if SEV-ES is active. Fixes: 63c50d3ff285 ("OvmfPkg/ResetVector: cache the SEV status MSR...") Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Diffstat (limited to 'EmulatorPkg/EmuSnpDxe/EmuSnpDxe.h')
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