PSP firmware is in system flash, but is verified by the PSP with its own signing key. PSP firmware is loaded before x86 comes up, and as long as the SEV firmware measures itself and as long as it patches the microcode loader before allowing x86 to run (which the description of the patch claims it does) I think SEV is rescuable.
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PSP firmware is in system flash, but is verified by the PSP with its own signing key. PSP firmware is loaded before x86 comes up, and as long as the SEV firmware measures itself and as long as it patches the microcode loader before allowing x86 to run (which the description of the patch claims it does) I think SEV is rescuable.