x86/reboot: KVM: Handle VMXOFF in KVM's reboot callback

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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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This commit is contained in:

Sean Christopherson 2023-07-21 13:18:43 -07:00

parent 5e408396c6

commit 119b5cb4ff

3 changed files with 14 additions and 33 deletions

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10

arch/x86/include/asm/virtext.h

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29

arch/x86/kernel/reboot.c

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8

arch/x86/kvm/vmx/vmx.c

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