linux-kernel - Re: [RFC v1 3/9] KVM: x86: Implement MSR_IA32_PEBS

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Date:   Thu, 29 Aug 2019 14:20:16 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Luwei Kang <luwei.kang@...el.com>
Cc:     pbonzini@...hat.com, rkrcmar@...hat.com,
        sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 3/9] KVM: x86: Implement MSR_IA32_PEBS_ENABLE read/write
 emulation

> +	case MSR_IA32_PEBS_ENABLE:
> +		if (pmu->pebs_enable == data)
> +			return 0;
> +		if (!(data & pmu->pebs_enable_mask) &&
> +		     (data & MSR_IA32_PEBS_OUTPUT_MASK) ==
> +						MSR_IA32_PEBS_OUTPUT_PT) {
> +			pebs_enable_changed(pmu, data);
> +			return 0;
> +		}

Need #GP for bad values