KVM: selftests: Stuff RAX/RCX with 'safe' values in vmmcall()/vmcall()

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vmmcall()/vmcall() are used to exit from L2 to L1 and no concrete hypercall
ABI is currenty followed. With the introduction of Hyper-V L2 TLB flush
it becomes (theoretically) possible that L0 will take responsibility for
handling the call and no L1 exit will happen. Prevent this by stuffing RAX
(KVM ABI) and RCX (Hyper-V ABI) with 'safe' values.

While on it, convert vmmcall() to 'static inline', make it setup stack
frame and move to include/x86_64/svm_util.h.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-45-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Vitaly Kuznetsov 2022-11-01 15:54:22 +01:00 • committed by Paolo Bonzini

parent 6c15c3c465

commit 8fda37cf3d

3 changed files with 24 additions and 10 deletions

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5

tools/testing/selftests/kvm/include/x86_64/processor.h

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tools/testing/selftests/kvm/include/x86_64/svm_util.h

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tools/testing/selftests/kvm/include/x86_64/vmx.h

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