linux-kernel - RE: [PATCH v1 09/23] KVM: VMX: Switch FRED RSP0 between host and guest

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Date:   Wed, 15 Nov 2023 03:04:10 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     "Gao, Chao" <chao.gao@...el.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "kys@...rosoft.com" <kys@...rosoft.com>,
        "haiyangz@...rosoft.com" <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "Cui, Dexuan" <decui@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>
Subject: RE: [PATCH v1 09/23] KVM: VMX: Switch FRED RSP0 between host and
 guest

> >> >diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h index
> >> >f8c02bd37069..328a3447f064 100644
> >> >--- a/arch/x86/kvm/vmx/vmx.h
> >> >+++ b/arch/x86/kvm/vmx/vmx.h
> >> >@@ -276,6 +276,8 @@ struct vcpu_vmx {
> >> > #ifdef CONFIG_X86_64
> >> > 	u64		      msr_host_kernel_gs_base;
> >> > 	u64		      msr_guest_kernel_gs_base;
> >> >+	u64		      msr_host_fred_rsp0;
> >> >+	u64		      msr_guest_fred_rsp0;
> >>
> >> resetting guest fred rsp0 to 0 during vcpu reset is missing.
> >
> >hmm, I assume it gets the same treatment as guest_kernel_gs_base.
> >
> >It seems we don't reset guest_kernel_gs_base.  No?
> 
> Yes. But for fred MSRs, FRED spec clearly says their RESET values
> are 0s. for kernel_gs_base MSR, looks there is no such description
> in SDM.

Right, maybe better to set both to 0s.