linux-kernel - Re: [PATCH v4 03/19] x86/reboot: KVM: Handle VMXOFF in KVM's reboot callback

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Message-ID: <10c6abab5143aaacf6783a71808e236bbbd13894.camel@intel.com>
Date:   Mon, 24 Jul 2023 23:57:03 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "tglx@...utronix.de" <tglx@...utronix.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Gao, Chao" <chao.gao@...el.com>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>
Subject: Re: [PATCH v4 03/19] x86/reboot: KVM: Handle VMXOFF in KVM's reboot
 callback

On Fri, 2023-07-21 at 13:18 -0700, Sean Christopherson wrote:
> 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.
> 
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> 

Reviewed-by: Kai Huang <kai.huang@...el.com>