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Tsirkin" , Stefan Hajnoczi , Igor Mammedov , Paolo Bonzini , Peter Xu , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v4 2/3] vhost: Remove vhost_backend_can_merge() callback Date: Tue, 23 May 2023 20:59:14 +0200 Message-Id: <20230523185915.540373-3-david@redhat.com> In-Reply-To: <20230523185915.540373-1-david@redhat.com> References: <20230523185915.540373-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=david@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_H2=-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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1684868474659100002 Content-Type: text/plain; charset="utf-8" Checking whether the memory regions are equal is sufficient: if they are equal, then most certainly the contained fd is equal. The whole vhost-user memslot handling is suboptimal and overly complicated. We shouldn't have to lookup a RAM memory regions we got notified about in vhost_user_get_mr_data() using a host pointer. But that requires a bigger rework -- especially an alternative vhost_set_mem_table() backend call that simply consumes MemoryRegionSections. For now, let's just drop vhost_backend_can_merge(). Acked-by: Stefan Hajnoczi Reviewed-by: Igor Mammedov Acked-by: Igor Mammedov Reviewed-by: Peter Xu Signed-off-by: David Hildenbrand --- hw/virtio/vhost-user.c | 14 -------------- hw/virtio/vhost-vdpa.c | 1 - hw/virtio/vhost.c | 6 +----- include/hw/virtio/vhost-backend.h | 4 ---- 4 files changed, 1 insertion(+), 24 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index a07eda5404..9c312dc223 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -2185,19 +2185,6 @@ static int vhost_user_migration_done(struct vhost_de= v *dev, char* mac_addr) return -ENOTSUP; } =20 -static bool vhost_user_can_merge(struct vhost_dev *dev, - uint64_t start1, uint64_t size1, - uint64_t start2, uint64_t size2) -{ - ram_addr_t offset; - int mfd, rfd; - - (void)vhost_user_get_mr_data(start1, &offset, &mfd); - (void)vhost_user_get_mr_data(start2, &offset, &rfd); - - return mfd =3D=3D rfd; -} - static int vhost_user_net_set_mtu(struct vhost_dev *dev, uint16_t mtu) { VhostUserMsg msg; @@ -2707,7 +2694,6 @@ const VhostOps user_ops =3D { .vhost_set_vring_enable =3D vhost_user_set_vring_enable, .vhost_requires_shm_log =3D vhost_user_requires_shm_log, .vhost_migration_done =3D vhost_user_migration_done, - .vhost_backend_can_merge =3D vhost_user_can_merge, .vhost_net_set_mtu =3D vhost_user_net_set_mtu, .vhost_set_iotlb_callback =3D vhost_user_set_iotlb_callback, .vhost_send_device_iotlb_msg =3D vhost_user_send_device_iotlb_msg, diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c index b3094e8a8b..9683a71c48 100644 --- a/hw/virtio/vhost-vdpa.c +++ b/hw/virtio/vhost-vdpa.c @@ -1505,7 +1505,6 @@ const VhostOps vdpa_ops =3D { .vhost_set_config =3D vhost_vdpa_set_config, .vhost_requires_shm_log =3D NULL, .vhost_migration_done =3D NULL, - .vhost_backend_can_merge =3D NULL, .vhost_net_set_mtu =3D NULL, .vhost_set_iotlb_callback =3D NULL, .vhost_send_device_iotlb_msg =3D NULL, diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 706255f97b..b2c1646ca4 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -729,11 +729,7 @@ static void vhost_region_add_section(struct vhost_dev = *dev, size_t offset =3D mrs_gpa - prev_gpa_start; =20 if (prev_host_start + offset =3D=3D mrs_host && - section->mr =3D=3D prev_sec->mr && - (!dev->vhost_ops->vhost_backend_can_merge || - dev->vhost_ops->vhost_backend_can_merge(dev, - mrs_host, mrs_size, - prev_host_start, prev_size))) { + section->mr =3D=3D prev_sec->mr) { uint64_t max_end =3D MAX(prev_host_end, mrs_host + mrs_siz= e); need_add =3D false; prev_sec->offset_within_address_space =3D diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-ba= ckend.h index 2349a4a7d2..f3ba7b676b 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -86,9 +86,6 @@ typedef int (*vhost_set_vring_enable_op)(struct vhost_dev= *dev, typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev); typedef int (*vhost_migration_done_op)(struct vhost_dev *dev, char *mac_addr); -typedef bool (*vhost_backend_can_merge_op)(struct vhost_dev *dev, - uint64_t start1, uint64_t size1, - uint64_t start2, uint64_t size2= ); typedef int (*vhost_vsock_set_guest_cid_op)(struct vhost_dev *dev, uint64_t guest_cid); typedef int (*vhost_vsock_set_running_op)(struct vhost_dev *dev, int start= ); @@ -163,7 +160,6 @@ typedef struct VhostOps { vhost_set_vring_enable_op vhost_set_vring_enable; vhost_requires_shm_log_op vhost_requires_shm_log; vhost_migration_done_op vhost_migration_done; - vhost_backend_can_merge_op vhost_backend_can_merge; vhost_vsock_set_guest_cid_op vhost_vsock_set_guest_cid; vhost_vsock_set_running_op vhost_vsock_set_running; vhost_set_iotlb_callback_op vhost_set_iotlb_callback; --=20 2.40.1