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Date: Wed, 9 Jun 2021 12:58:41 +0300 Message-Id: <20210609095843.141378-2-andrew@daynix.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609095843.141378-1-andrew@daynix.com> References: <20210609095843.141378-1-andrew@daynix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: none client-ip=2a00:1450:4864:20::12a; envelope-from=andrew@daynix.com; helo=mail-lf1-x12a.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @daynix-com.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" 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 --- 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 b321604d9b..05865b1fcb 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1146,6 +1146,10 @@ 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; @@ -1229,6 +1233,10 @@ 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 2.31.1