linux-kernel - Re: [RFC 04/16] KVM: selftests: set CPUID before setting sregs in vcpu creation

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Message-ID: <29aa85d5-fcc7-bf25-dd04-2476dc7b6241@oracle.com>
Date:   Tue, 12 Oct 2021 18:45:09 -0700
From:   Krish Sadhukhan <krish.sadhukhan@...cle.com>
To:     Michael Roth <michael.roth@....com>,
        linux-kselftest@...r.kernel.org
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        Nathan Tempelman <natet@...gle.com>,
        Marc Orr <marcorr@...gle.com>,
        Steve Rutherford <srutherford@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Varad Gautam <varad.gautam@...e.com>,
        Shuah Khan <shuah@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Ricardo Koller <ricarkol@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>
Subject: Re: [RFC 04/16] KVM: selftests: set CPUID before setting sregs in
 vcpu creation


On 10/6/21 1:36 PM, Michael Roth wrote:
> KVM_SET_CPUID*, but kselftests currently call KVM_SET_SREGS as part of
> vm_vcpu_add_default(),*prior*  to vCPU creation, so there's no
> opportunity to call KVM_SET_CPUID* in advance. As a result,
In the current code, I see that KVM_SET_SREGS is called by vcpu_setup() 
which is called after vm_vcpu_add() that calls KVM_CREATE_VCPU. Since 
you mentioned "prior", I wanted to check if the wording was wrong or if 
I missed something.