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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1745337845; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2VZKzKrObXz1Em2RQU2saLAh/MTKnA+pomCFFXy9C5g=; b=AkTXw02z2lM6SmIKsv4f5eLEidUm12qPtcQV/Gw0bb2Tp7IUgB59EOmMe6O7dY8sXOphzy l4qze7SAMdnDQ9VeO0IvBcPxk1lIvCkWDrFsATXCWv7e43vR32nuc9xSnVRA6YLcUQaJ9s lV1o6t1zcdh3ZFmN3Yoz2t6MPFxLNT4= X-MC-Unique: tcOQNlkZNnmH7Te5ZO9JbA-1 X-Mimecast-MFC-AGG-ID: tcOQNlkZNnmH7Te5ZO9JbA_1745337839 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org, Alex Williamson Cc: Avihai Horon , Eric Auger , Zhenzhong Duan , John Levon , Joao Martins , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v3 25/37] vfio: Move vfio_reset_handler() into device.c Date: Tue, 22 Apr 2025 18:02:12 +0200 Message-ID: <20250422160224.199714-26-clg@redhat.com> In-Reply-To: <20250422160224.199714-1-clg@redhat.com> References: <20250422160224.199714-1-clg@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 10.30.177.111 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=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.411, 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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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: 2.1.29 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: 1745338106715019000 Pass-through devices of a VM are not necessarily in the same group and all groups/address_spaces need to be scanned when the machine is reset. Commit f16f39c3fc97 ("Implement PCI hot reset") introduced a VM reset handler for this purpose. Move it under device.c Also reintroduce the comment which explained the context and was lost along the way. Reviewed-by: Zhenzhong Duan Reviewed-by: John Levon Link: https://lore.kernel.org/qemu-devel/20250326075122.1299361-26-clg@redh= at.com Signed-off-by: C=C3=A9dric Le Goater --- hw/vfio/common.c | 18 ------------------ hw/vfio/device.c | 35 +++++++++++++++++++++++++++++++++++ hw/vfio/trace-events | 2 +- 3 files changed, 36 insertions(+), 19 deletions(-) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index a4052526ece5fdee0e690ad133416d1dc4eb1815..e62bb3818c55a789e81fe50cebf= 7c6693228db31 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1301,21 +1301,3 @@ const MemoryListener vfio_memory_listener =3D { .log_global_stop =3D vfio_listener_log_global_stop, .log_sync =3D vfio_listener_log_sync, }; - -void vfio_reset_handler(void *opaque) -{ - VFIODevice *vbasedev; - - trace_vfio_reset_handler(); - QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) { - if (vbasedev->dev->realized) { - vbasedev->ops->vfio_compute_needs_reset(vbasedev); - } - } - - QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) { - if (vbasedev->dev->realized && vbasedev->needs_reset) { - vbasedev->ops->vfio_hot_reset_multi(vbasedev); - } - } -} diff --git a/hw/vfio/device.c b/hw/vfio/device.c index 179c9fb8decc42dcd8d1b4fe10e7acaa2a6f2c7c..e122c797c206c285ef26c3a56d8= 41d8c3be8b58b 100644 --- a/hw/vfio/device.c +++ b/hw/vfio/device.c @@ -34,6 +34,41 @@ VFIODeviceList vfio_device_list =3D QLIST_HEAD_INITIALIZER(vfio_device_list); =20 +/* + * We want to differentiate hot reset of multiple in-use devices vs + * hot reset of a single in-use device. VFIO_DEVICE_RESET will already + * handle the case of doing hot resets when there is only a single + * device per bus. The in-use here refers to how many VFIODevices are + * affected. A hot reset that affects multiple devices, but only a + * single in-use device, means that we can call it from our bus + * ->reset() callback since the extent is effectively a single + * device. This allows us to make use of it in the hotplug path. When + * there are multiple in-use devices, we can only trigger the hot + * reset during a system reset and thus from our reset handler. We + * separate _one vs _multi here so that we don't overlap and do a + * double reset on the system reset path where both our reset handler + * and ->reset() callback are used. Calling _one() will only do a hot + * reset for the one in-use devices case, calling _multi() will do + * nothing if a _one() would have been sufficient. + */ +void vfio_reset_handler(void *opaque) +{ + VFIODevice *vbasedev; + + trace_vfio_reset_handler(); + QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) { + if (vbasedev->dev->realized) { + vbasedev->ops->vfio_compute_needs_reset(vbasedev); + } + } + + QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) { + if (vbasedev->dev->realized && vbasedev->needs_reset) { + vbasedev->ops->vfio_hot_reset_multi(vbasedev); + } + } +} + /* * Common VFIO interrupt disable */ diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 590d9674cf7bc47171516082abaf398dda72b86d..9fee7df8764978723f79dc60d3d= c796777278858 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -108,7 +108,6 @@ vfio_put_base_device(int fd) "close vdev->fd=3D%d" vfio_legacy_dma_unmap_overflow_workaround(void) "" vfio_get_dirty_bitmap(uint64_t iova, uint64_t size, uint64_t bitmap_size, = uint64_t start, uint64_t dirty_pages) "iova=3D0x%"PRIx64" size=3D 0x%"PRIx6= 4" bitmap_size=3D0x%"PRIx64" start=3D0x%"PRIx64" dirty_pages=3D%"PRIu64 vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu= dirty @ 0x%"PRIx64" - 0x%"PRIx64 -vfio_reset_handler(void) "" =20 # region.c vfio_region_write(const char *name, int index, uint64_t addr, uint64_t dat= a, unsigned size) " (%s:region%d+0x%"PRIx64", 0x%"PRIx64 ", %d)" @@ -196,3 +195,4 @@ iommufd_cdev_pci_hot_reset_dep_devices(int domain, int = bus, int slot, int functi =20 # device.c vfio_get_dev_region(const char *name, int index, uint32_t type, uint32_t s= ubtype) "%s index %d, %08x/%08x" +vfio_reset_handler(void) "" --=20 2.49.0