Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Message-ID: <dc14c98c-e35a-95c0-83dd-13b5f7cffc03@gmail.com>
Date:   Wed, 16 Feb 2022 15:47:33 +0800
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0)
 Gecko/20100101 Thunderbird/91.6.0
Subject: Re: [PATCH] KVM: x86/pmu: Fix reserved bits for AMD PerfEvtSeln
 register
Content-Language: en-US
To:     Jim Mattson <jmattson@google.com>,
        David Dunn <daviddunn@google.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>,
        Joerg Roedel <joro@8bytes.org>,
        Kim Phillips <kim.phillips@amd.com>,
        Maxim Levitsky <mlevitsk@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20211118130320.95997-1-likexu@tencent.com>
 <CALMp9eTONaviuz-NnPUP2=MEOb8ZBkZ7u_ZQBWBUne-i6cRUkA@mail.gmail.com>
From:   Like Xu <like.xu.linux@gmail.com>
Organization: Tencent
In-Reply-To: <CALMp9eTONaviuz-NnPUP2=MEOb8ZBkZ7u_ZQBWBUne-i6cRUkA@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 12/2/2022 4:39 pm, Jim Mattson wrote:
>> -       pmu->reserved_bits = 0xffffffff00200000ull;
>> +       pmu->reserved_bits = 0xfffffff000280000ull;
> Bits 40 and 41 are guest mode and host mode. They cannot be reserved
> if the guest supports nested SVM.
> 

Indeed, we need (some hands) to do more pmu tests on nested SVM.