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Tsirkin" , Marcel Apfelbaum , Igor Mammedov , qemu-arm@nongnu.org, Gavin Shan , Mario Casquero Subject: [PATCH v3 4/7] virtio-md-pci: Handle unplug of virtio based memory devices Date: Mon, 10 Jul 2023 12:07:11 +0200 Message-ID: <20230710100714.228867-5-david@redhat.com> In-Reply-To: <20230710100714.228867-1-david@redhat.com> References: <20230710100714.228867-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 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=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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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: 1688983752037100003 Content-Type: text/plain; charset="utf-8" While we fence unplug requests from the outside, the VM can still trigger unplug of virtio based memory devices, for example, in Linux doing on a virtio-mem-pci device: # echo 0 > /sys/bus/pci/slots/3/power While doing that is not really expected to work without harming the guest OS (e.g., removing a virtio-mem device while it still provides memory), let's make sure that we properly handle it on the QEMU side. We'll add support for unplugging of virtio-mem devices in some configurations next. Signed-off-by: David Hildenbrand --- hw/virtio/virtio-md-pci.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/hw/virtio/virtio-md-pci.c b/hw/virtio/virtio-md-pci.c index e849c3131d..a22a259e2d 100644 --- a/hw/virtio/virtio-md-pci.c +++ b/hw/virtio/virtio-md-pci.c @@ -14,6 +14,7 @@ #include "hw/virtio/virtio-md-pci.h" #include "hw/mem/memory-device.h" #include "qapi/error.h" +#include "qemu/error-report.h" =20 void virtio_md_pci_pre_plug(VirtIOMDPCI *vmd, MachineState *ms, Error **er= rp) { @@ -74,7 +75,27 @@ void virtio_md_pci_unplug_request(VirtIOMDPCI *vmd, Mach= ineState *ms, =20 void virtio_md_pci_unplug(VirtIOMDPCI *vmd, MachineState *ms, Error **errp) { - /* We don't support hot unplug of virtio based memory devices */ + DeviceState *dev =3D DEVICE(vmd); + HotplugHandler *bus_handler =3D qdev_get_bus_hotplug_handler(dev); + MemoryDeviceState *md =3D MEMORY_DEVICE(vmd); + Error *local_err =3D NULL; + + /* Unplug the memory device while it is still realized. */ + memory_device_unplug(md, ms); + + if (bus_handler) { + hotplug_handler_unplug(bus_handler, dev, &local_err); + if (local_err) { + /* Not expected to fail ... but still try to recover. */ + memory_device_plug(md, ms); + error_propagate(errp, local_err); + return; + } + } else { + /* Very unexpected, but let's just try to do the right thing. */ + warn_report("Unexpected unplug of virtio based memory device"); + qdev_unrealize(dev); + } } =20 static const TypeInfo virtio_md_pci_info =3D { --=20 2.41.0