Re: [PATCH 6.1.y 2/3] x86/reboot: KVM: Handle VMXOFF in KVM's reboot callback

On Thu, Jul 24, 2025, Sasha Levin wrote:

From: Sean Christopherson seanjc@google.com

[ Upstream commit 119b5cb4ffd0166f3e98e9ee042f5046f7744f28 ]

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 Stable-dep-of: a0ee1d5faff1 ("KVM: VMX: Flush shadow VMCS on emergency reboot") Signed-off-by: Sasha Levin sashal@kernel.org

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Acked-by: Sean Christopherson seanjc@google.com