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

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Message-ID: <d50f564071a7d8cc63a25bb9c96317504f021f49.camel@redhat.com>
Date:   Wed, 25 May 2022 17:14:45 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Paolo Bonzini <pbonzini@...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 Wed, 2022-05-25 at 16:13 +0200, Paolo Bonzini wrote:
> 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
> 

Thank you very much!


Best regards,
	Maxim Levitsky