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[79.180.2.31]) by smtp.gmail.com with ESMTPSA id x15sm19731236wro.66.2021.02.09.06.55.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Feb 2021 06:55:37 -0800 (PST) Date: Tue, 9 Feb 2021 09:55:32 -0500 From: "Michael S. Tsirkin" To: Adrian Catangiu Subject: Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver Message-ID: <20210209095350-mutt-send-email-mst@kernel.org> References: <1612200294-17561-1-git-send-email-acatan@amazon.com> <1612200294-17561-3-git-send-email-acatan@amazon.com> MIME-Version: 1.0 In-Reply-To: <1612200294-17561-3-git-send-email-acatan@amazon.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -33 X-Spam_score: -3.4 X-Spam_bar: --- X-Spam_report: (-3.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.57, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason@zx2c4.com, areber@redhat.com, kvm@vger.kernel.org, linux-doc@vger.kernel.org, ghammer@redhat.com, vijaysun@ca.ibm.com, 0x7f454c46@gmail.com, qemu-devel@nongnu.org, mhocko@kernel.org, dgunigun@redhat.com, avagin@gmail.com, pavel@ucw.cz, ptikhomirov@virtuozzo.com, linux-s390@vger.kernel.org, corbet@lwn.net, mpe@ellerman.id.au, rafael@kernel.org, ebiggers@kernel.org, borntraeger@de.ibm.com, sblbir@amazon.com, bonzini@gnu.org, arnd@arndb.de, jannh@google.com, raduweis@amazon.com, asmehra@redhat.com, graf@amazon.com, rppt@kernel.org, luto@kernel.org, gil@azul.com, oridgar@gmail.com, colmmacc@amazon.com, tytso@mit.edu, gregkh@linuxfoundation.org, rdunlap@infradead.org, linux-kernel@vger.kernel.org, ebiederm@xmission.com, ovzxemul@gmail.com, w@1wt.eu, dwmw@amazon.co.uk Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" > +The ``vmgenid`` driver uses ACPI events to be notified by hardware > +changes to the 128-bit Vm Gen Id UUID. That's ok, problem is ACPI event processing is asynchronous. What we need is thus to flush out ACPI events whenever userspace does a read, otherwise the value it gets will be stale. -- MST