KVM: SVM: Require nrips support for SEV guests (and beyond)

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Disallow SEV (and beyond) if nrips is disabled via module param, as KVM
can't read guest memory to partially emulate and skip an instruction.  All
CPUs that support SEV support NRIPS, i.e. this is purely stopping the user
from shooting themselves in the foot.

Cc: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20230825013621.2845700-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Sean Christopherson 2023-08-24 18:36:19 -07:00

parent cb49631ad1

commit 80d0f521d5

3 changed files with 6 additions and 8 deletions

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arch/x86/kvm/svm/sev.c

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arch/x86/kvm/svm/svm.c

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1

arch/x86/kvm/svm/svm.h

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