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Inject a #GP if the guest attempts to set reserved bits in the x2APIC-only Self-IPI register. Bits 7:0 hold the vector, all other bits are reserved. Reported-by: Marc Orr <marcorr@google.com> Cc: Ben Gardon <bgardon@google.com> Cc: Venkatesh Srinivas <venkateshs@chromium.org> Cc: stable@vger.kernel.org Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com> Link: https://lore.kernel.org/r/20230107011025.565472-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>