Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 29 Aug 2019 14:20:16 -0700
From:   Andi Kleen <ak@linux.intel.com>
To:     Luwei Kang <luwei.kang@intel.com>
Cc:     pbonzini@redhat.com, rkrcmar@redhat.com,
        sean.j.christopherson@intel.com, vkuznets@redhat.com,
        wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
        tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
        x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC v1 3/9] KVM: x86: Implement MSR_IA32_PEBS_ENABLE read/write
 emulation
Message-ID: <20190829212016.GV5447@tassilo.jf.intel.com>
References: <1567056849-14608-1-git-send-email-luwei.kang@intel.com>
 <1567056849-14608-4-git-send-email-luwei.kang@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1567056849-14608-4-git-send-email-luwei.kang@intel.com>
User-Agent: Mutt/1.12.0 (2019-05-25)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

> +	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