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Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 04/13] virtio-pci: Added check for virtio device presence in mm callbacks. Message-ID: <20210707150157.52328-5-mst@redhat.com> References: <20210707150157.52328-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210707150157.52328-1-mst@redhat.com> X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent 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-Disposition: inline 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=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.439, 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_H4=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: Peter Maydell , Andrew Melnychenko Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1625670366985100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Andrew Melnychenko During unplug the virtio device is unplugged from virtio-bus on pci. In som= e cases, requests to virtio-pci mm may acquire during/after unplug. Added check that= virtio device is on the bus, for "common" memory region. Signed-off-by: Andrew Melnychenko Message-Id: <20210609095843.141378-2-andrew@daynix.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio-pci.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index f1e105fa52..1bef7a2be8 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1147,6 +1147,10 @@ static uint64_t virtio_pci_common_read(void *opaque,= hwaddr addr, uint32_t val =3D 0; int i; =20 + if (vdev =3D=3D NULL) { + return UINT64_MAX; + } + switch (addr) { case VIRTIO_PCI_COMMON_DFSELECT: val =3D proxy->dfselect; @@ -1230,6 +1234,10 @@ static void virtio_pci_common_write(void *opaque, hw= addr addr, VirtIOPCIProxy *proxy =3D opaque; VirtIODevice *vdev =3D virtio_bus_get_device(&proxy->bus); =20 + if (vdev =3D=3D NULL) { + return; + } + switch (addr) { case VIRTIO_PCI_COMMON_DFSELECT: proxy->dfselect =3D val; --=20 MST