x86/reboot: KVM: Handle VMXOFF in KVM's reboot callback
Use KVM VMX's reboot/crash callback to do VMXOFF in an emergency instead of manually and blindly doing VMXOFF. There's no need to attempt VMXOFF if a hypervisor, i.e. KVM, isn't loaded/active, i.e. if the CPU can't possibly be post-VMXON. Reviewed-by: Kai Huang <kai.huang@intel.com> Link: https://lore.kernel.org/r/20230721201859.2307736-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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5e408396
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