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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f400:feae::70e; envelope-from=wafer@jaguarmicro.com; helo=APC01-PSA-obe.outbound.protection.outlook.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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @jaguarmicro.com) X-ZM-MESSAGEID: 1715255287849100001 The virtio-1.3 specification writes: 2.8.6 Next Flag: Descriptor Chaining Buffer ID is included in the last descriptor in the list. If the feature (_F_INDIRECT_DESC) has been negotiated, install only one descriptor in the virtqueue. Therefor the buffer id should be obtained from the first descriptor. In descriptor chaining scenarios, the buffer id should be obtained from the last descriptor. Fixes: 86044b24e8 ("virtio: basic packed virtqueue support") Signed-off-by: Wafer Reviewed-by: Jason Wang Reviewed-by: Eugenio P=C3=A9rez -- Changes in v2: - Use Jason suggestion: Move the code out of the loop. --- hw/virtio/virtio.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 871674f9be..e9e8447878 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -1744,6 +1744,11 @@ static void *virtqueue_packed_pop(VirtQueue *vq, siz= e_t sz) &indirect_desc_cache); } while (rc =3D=3D VIRTQUEUE_READ_DESC_MORE); =20 + if (desc_cache !=3D &indirect_desc_cache) { + /* Buffer ID is included in the last descriptor in the list. */ + id =3D desc.id; + } + /* Now copy what we have collected and mapped */ elem =3D virtqueue_alloc_element(sz, out_num, in_num); for (i =3D 0; i < out_num; i++) { --=20 2.27.0