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Tue, 29 Mar 2022 22:22:20 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwhZNA71rh4p3gznLJEzepRF8Cf0lFbyruap5Iy8lNQ71ai2JE9ehQlS8ISFWRukJV+gCHPgQ== X-Received: by 2002:a05:600c:4ec9:b0:38b:f1fd:b6b9 with SMTP id g9-20020a05600c4ec900b0038bf1fdb6b9mr2613631wmq.7.1648617740126; Tue, 29 Mar 2022 22:22:20 -0700 (PDT) Received: from redhat.com ([2.52.9.207]) by smtp.gmail.com with ESMTPSA id m2-20020a1c2602000000b0038ca9ffac53sm3730095wmm.11.2022.03.29.22.22.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Mar 2022 22:22:19 -0700 (PDT) Date: Wed, 30 Mar 2022 01:22:15 -0400 From: "Michael S. Tsirkin" To: Jason Wang Cc: Stefano Garzarella , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, maz@kernel.org, tglx@linutronix.de, peterz@infradead.org, keirf@google.com Subject: Re: [PATCH 1/3] virtio: use virtio_device_ready() in virtio_device_restore() Message-ID: <20220330012204-mutt-send-email-mst@kernel.org> References: <20220324084004.14349-1-jasowang@redhat.com> <20220324084004.14349-2-jasowang@redhat.com> <20220324064205-mutt-send-email-mst@kernel.org> <20220324110307.iizkdwuhc5c75noj@sgarzare-redhat> <20220324070612-mutt-send-email-mst@kernel.org> <20220324113126.f6f5hfabhqfyutix@sgarzare-redhat> <81381018-9dcd-3fba-becf-183435a5bf6b@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <81381018-9dcd-3fba-becf-183435a5bf6b@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 25, 2022 at 11:05:22AM +0800, Jason Wang wrote: > > 在 2022/3/24 下午7:31, Stefano Garzarella 写道: > > On Thu, Mar 24, 2022 at 07:07:09AM -0400, Michael S. Tsirkin wrote: > > > On Thu, Mar 24, 2022 at 12:03:07PM +0100, Stefano Garzarella wrote: > > > > On Thu, Mar 24, 2022 at 06:48:05AM -0400, Michael S. Tsirkin wrote: > > > > > On Thu, Mar 24, 2022 at 04:40:02PM +0800, Jason Wang wrote: > > > > > > From: Stefano Garzarella > > > > > > > > > > > > This avoids setting DRIVER_OK twice for those drivers that call > > > > > > virtio_device_ready() in the .restore > > > > > > > > > > Is this trying to say it's faster? > > > > > > > > Nope, I mean, when I wrote the original version, I meant to do the same > > > > things that we do in virtio_dev_probe() where we called > > > > virtio_device_ready() which not only set the state, but also called > > > > .enable_cbs callback. > > > > > > > > Was this a side effect and maybe more compliant with the spec? > > > > > > > > > Sorry I don't understand the question. it says "avoids setting > > > DRIVER_OK twice" - > > > why is that advantageous and worth calling out in the commit log? > > > > I just wanted to say that it seems strange to set DRIVER_OK twice if we > > read the spec. I don't think it's wrong, but weird. > > > > Yes, maybe we should rewrite the commit message saying that we want to > > use virtio_device_ready() everywhere to complete the setup before > > setting DRIVER_OK so we can do all the necessary operations inside (like > > in patch 3 or call enable_cbs). > > > > Jason rewrote the commit log, so I don't know if he agrees. > > > > Thanks, > > Stefano > > > I agree, I will tweak the log in V2. > > Thanks Still waiting for that v2.