Gleb Natapov wrote
BTW, I don't think it's write-protected and it probably should be?

AFAIR it is not writable on plain qemu.

KVM wants it to be writable for the TPR optimization. Historically, it was read-only in QEMU but it changed to read-write in order to fake coreboot into thinking that the bios implemented PMM which it doesn't.

--
Regards,

Anthony Liguori

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