linux-kernel - Re: [PATCH RESEND v12 00/17] KVM: x86/pmu: Add basic support to enable guest PEBS via DS

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Date:   Wed, 25 May 2022 16:13:38 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>,
        Like Xu <like.xu.linux@...il.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Jim Mattson <jmattson@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH RESEND v12 00/17] KVM: x86/pmu: Add basic support to
 enable guest PEBS via DS

On 5/25/22 16:12, Maxim Levitsky wrote:
> FYI, this patch series also break 'msr' test in kvm-unit tests.
> (kvm/queue of today, and master of the kvm-unit-tests repo)
> 
> The test tries to set the MSR_IA32_MISC_ENABLE to 0x400c51889 and gets #GP.
> 
> 
> Commenting this out, gets rid of #GP, but test still fails with unexpected result
> 
> 		if (!msr_info->host_initiated &&
> 		    ((old_val ^ data) & MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL))
> 			return 1;
> 
> 
> 
> 
> It is very possible that the test is broken, I'll check this later.

Yes, for that I've sent a patch already:

https://lore.kernel.org/kvm/20220520183207.7952-1-pbonzini@redhat.com/

Paolo