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[35.230.65.123]) by smtp.gmail.com with ESMTPSA id r20-20020a170902be1400b0016b68cf6ae5sm23565302pls.226.2022.07.07.10.08.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 10:08:39 -0700 (PDT) Date: Thu, 7 Jul 2022 17:08:35 +0000 From: Sean Christopherson To: Paolo Bonzini Cc: Marc Zyngier , Gavin Shan , Catalin Marinas , will@kernel.org, linux-kernel@vger.kernel.org, eauger@redhat.com, shan.gavin@gmail.com, Jonathan.Cameron@huawei.com, vkuznets@redhat.com, shijie@amperemail.onmicrosoft.com, kvmarm@lists.cs.columbia.edu, Peter Feiner Subject: Re: [PATCH v7 00/22] Support SDEI Virtualization Message-ID: References: <20220527080253.1562538-1-gshan@redhat.com> <6bdb9280-3530-dc1f-d33e-5bc1c5ac927b@redhat.com> <87iloq2oke.wl-maz@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-17.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE,USER_IN_DEF_DKIM_WL,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 05, 2022, Paolo Bonzini wrote: > That said: Peter, Sean, Google uses or used postcopy extensively on GCE > (https://dl.acm.org/doi/pdf/10.1145/3296975.3186415). If it doesn't use it > on x86, do you have any insights on why? We still use postcopy, but we don't use async #PF. Async #PF is disabled (mostly?) because the x86 implementation was such a mess prior to switching to IRQ-based delivery and AFAIK we haven't re-evaluated it since that update.