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Tsirkin" , Dragos Tatulea , Yajun Wu , Juan Quintela , Laurent Vivier , Stefano Garzarella , Parav Pandit , Lei Yang , si-wei.liu@oracle.com Subject: [RFC PATCH v2 01/10] vdpa: do not set virtio status bits if unneeded Date: Tue, 28 Nov 2023 11:42:54 +0100 Message-Id: <20231128104303.3314000-2-eperezma@redhat.com> In-Reply-To: <20231128104303.3314000-1-eperezma@redhat.com> References: <20231128104303.3314000-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1701168295418000003 Next commits will set DRIVER and ACKNOWLEDGE flags repeatedly in the case of a migration destination. Let's save ioctls with this. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-vdpa.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index 7500c2fc82..cc252fc2d8 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -510,6 +510,10 @@ static int vhost_vdpa_add_status(struct vhost_dev *dev= , uint8_t status) if (ret < 0) { return ret; } + if ((s & status) =3D=3D status) { + /* Don't set bits already set */ + return 0; + } =20 s |=3D status; =20 --=20 2.39.3