linux-kernel - Re: [PATCH v2 21/21] KVM:x86: Support CET supervisor shadow stack MSR access

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Date:   Thu, 4 May 2023 09:11:08 +0800
From:   "Yang, Weijiang" <weijiang.yang@...el.com>
To:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "john.allen@....com" <john.allen@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 21/21] KVM:x86: Support CET supervisor shadow stack MSR
 access


On 5/4/2023 1:06 AM, Edgecombe, Rick P wrote:
> On Fri, 2023-04-21 at 09:46 -0400, Yang Weijiang wrote:
>> @@ -2471,6 +2495,12 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu,
>> struct msr_data *msr_info)
>>                  else
>>                          kvm_set_xsave_msr(msr_info);
>>                  break;
>> +       case MSR_IA32_PL0_SSP ... MSR_IA32_PL2_SSP:
>> +       case MSR_IA32_INT_SSP_TAB:
>> +               if (!cet_is_msr_accessible(vcpu, msr_info))
>> +                       return 1;
>> +               kvm_set_xsave_msr(msr_info);
>> +               break;
> These are supposed to be canonical too, right?

Yes, I'll add check in next version, thanks!