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([2001:b07:6468:f312:ac19:d1fb:3f5f:d54f]) by smtp.gmail.com with ESMTPSA id d5sm29819654wrp.44.2020.04.29.03.54.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Apr 2020 03:54:39 -0700 (PDT) Subject: Re: [PATCH RFC 3/6] KVM: x86: interrupt based APF page-ready event delivery To: Vitaly Kuznetsov , x86@kernel.org, kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Sean Christopherson , Wanpeng Li , Jim Mattson References: <20200429093634.1514902-1-vkuznets@redhat.com> <20200429093634.1514902-4-vkuznets@redhat.com> From: Paolo Bonzini Message-ID: <546bb75a-ec00-f748-1f44-2b5299a3d3d7@redhat.com> Date: Wed, 29 Apr 2020 12:54:38 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200429093634.1514902-4-vkuznets@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 29/04/20 11:36, Vitaly Kuznetsov wrote: > + > + Type 1 page (page missing) events are currently always delivered as > + synthetic #PF exception. Type 2 (page ready) are either delivered > + by #PF exception (when bit 3 of MSR_KVM_ASYNC_PF_EN is clear) or > + via an APIC interrupt (when bit 3 set). APIC interrupt delivery is > + controlled by MSR_KVM_ASYNC_PF2. I think we should (in the non-RFC version) block async page faults completely and only keep APF_HALT unless the guest is using page ready interrupt delivery. Paolo