linux-kernel - Re: [PATCH v5 13/19] KVM:VMX: Set up interception for CET MSRs

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Message-ID: <ZNBF4t+x5Gf14PV7@chao-email>
Date:   Mon, 7 Aug 2023 09:16:18 +0800
From:   Chao Gao <chao.gao@...el.com>
To:     "Yang, Weijiang" <weijiang.yang@...el.com>
CC:     <seanjc@...gle.com>, <pbonzini@...hat.com>, <peterz@...radead.org>,
        <john.allen@....com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <rick.p.edgecombe@...el.com>,
        <binbin.wu@...ux.intel.com>
Subject: Re: [PATCH v5 13/19] KVM:VMX: Set up interception for CET MSRs

>> > +	if (kvm_cpu_cap_has(X86_FEATURE_IBT)) {
>> > +		incpt = !guest_can_use(vcpu, X86_FEATURE_IBT);
>> can you use guest_can_use() or guest_cpuid_has() consistently?
>Hmm, the inspiration actually came from Sean:
>Re: [RFC PATCH v2 3/6] KVM: x86: SVM: Pass through shadow stack MSRs - Sean Christopherson (kernel.org) <https://lore.kernel.org/all/ZMk14YiPw9l7ZTXP@google.com/>
>it would make the code more reasonable on non-CET platforms.

then, can you switch to use guest_cpuid_has() for IBT here as you do a few
lines above for the SHSTK? that's why I said "consistently".