x86/sev: Add support for the RMPREAD instruction

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The RMPREAD instruction returns an architecture defined format of an
RMP table entry. This is the preferred method for examining RMP entries.

The instruction is advertised in CPUID 0x8000001f_EAX[21]. Use this
instruction when available.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikunj A Dadhania <nikunj@amd.com>
Reviewed-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Reviewed-by: Ashish Kalra <ashish.kalra@amd.com>
Link: https://lore.kernel.org/r/72c734ac8b324bbc0c839b2c093a11af4a8881fa.1733172653.git.thomas.lendacky@amd.com

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Tom Lendacky 2024-12-02 14:50:47 -06:00 • committed by Borislav Petkov (AMD)

parent 3e43c60eb3

commit 0cbc025841

2 changed files with 13 additions and 0 deletions

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arch/x86/include/asm/cpufeatures.h

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arch/x86/virt/svm/sev.c

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