KVM: selftests: x86: Use host's native hypercall instruction in kvm_hypercall()

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Use the host CPU's native hypercall instruction, i.e. VMCALL vs. VMMCALL,
in kvm_hypercall(), as relying on KVM to patch in the native hypercall on
a #UD for the "wrong" hypercall requires KVM_X86_QUIRK_FIX_HYPERCALL_INSN
to be enabled and flat out doesn't work if guest memory is encrypted with
a private key, e.g. for SEV VMs.

Suggested-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Vishal Annapurve <vannapurve@google.com>
Link: https://lore.kernel.org/r/20230111004445.416840-4-vannapurve@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Vishal Annapurve 2023-01-11 00:44:45 +00:00 • committed by Sean Christopherson

parent e6df2ae3f5

commit ea25ace771

1 changed files with 8 additions and 2 deletions

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tools/testing/selftests/kvm/lib/x86_64/processor.c

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