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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1764869414; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ha9Yhi1RnCsOPopMfTBzvDZYyFAfAljzcfLsCRvtCek=; b=dA5sXBuipQ+BUEHZgEWIBsDuWvk4djNZDwcnOyqb7mjq9AESkjBwC4lCQSkNA9rngqpGOW qtroWXrTnVfswE9dqm54dnRMSIwcS5ccCN2F8PzXpZBXNidRwitLqKVZmU2BzvBi0bOOv4 niv46xP8V7IotNBCNvjvTz/+/and/MM= X-MC-Unique: uDa5_pNmO8Cc5_IBls5M_w-1 X-Mimecast-MFC-AGG-ID: uDa5_pNmO8Cc5_IBls5M_w_1764869412 From: Kevin Wolf To: qemu-devel@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, mst@redhat.com, akihiko.odaki@daynix.com, qemu-stable@nongnu.org Subject: [PATCH] virtio: Fix crash when sriov-pf is set for non-PCI-Express device Date: Thu, 4 Dec 2025 18:26:57 +0100 Message-ID: <20251204172657.174391-1-kwolf@redhat.com> MIME-Version: 1.0 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; 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charset="utf-8" Setting the sriov-pf property on devices that aren't PCI Express causes an assertion failure: $ qemu-system-x86_64 \ -blockdev null-co,node-name=3Dnull \ -blockdev null-co,node-name=3Dnull2 \ -device virtio-blk,drive=3Dnull,id=3Dpf \ -device virtio-blk,sriov-pf=3Dpf,drive=3Dnull2 qemu-system-x86_64: ../hw/pci/pcie.c:1062: void pcie_add_capability(PCI= Device *, uint16_t, uint8_t, uint16_t, uint16_t): Assertion `offset >=3D PC= I_CONFIG_SPACE_SIZE' failed. This is because proxy->last_pcie_cap_offset is only initialised to a non-zero value in virtio_pci_realize() if it's a PCI Express device, and then virtio_pci_device_plugged() still tries to use it. To fix this, just skip the SR-IOV code for !pci_is_express(). Then the next thing pci_qdev_realize() does is call pcie_sriov_register_device(), which returns the appropriate error. Cc: qemu-stable@nongnu.org Fixes: d0c280d3fac6 ('pcie_sriov: Make a PCI device with user-created VF AR= I-capable') Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi --- hw/virtio/virtio-pci.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 99cb30fe595..c9a162728cd 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -2183,15 +2183,17 @@ static void virtio_pci_device_plugged(DeviceState *= d, Error **errp) PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar); } =20 - if (pci_is_vf(&proxy->pci_dev)) { - pcie_ari_init(&proxy->pci_dev, proxy->last_pcie_cap_offset); - proxy->last_pcie_cap_offset +=3D PCI_ARI_SIZEOF; - } else { - res =3D pcie_sriov_pf_init_from_user_created_vfs( - &proxy->pci_dev, proxy->last_pcie_cap_offset, errp); - if (res > 0) { - proxy->last_pcie_cap_offset +=3D res; - virtio_add_feature(&vdev->host_features, VIRTIO_F_SR_IOV); + if (pci_is_express(&proxy->pci_dev)) { + if (pci_is_vf(&proxy->pci_dev)) { + pcie_ari_init(&proxy->pci_dev, proxy->last_pcie_cap_offset); + proxy->last_pcie_cap_offset +=3D PCI_ARI_SIZEOF; + } else { + res =3D pcie_sriov_pf_init_from_user_created_vfs( + &proxy->pci_dev, proxy->last_pcie_cap_offset, errp); + if (res > 0) { + proxy->last_pcie_cap_offset +=3D res; + virtio_add_feature(&vdev->host_features, VIRTIO_F_SR_IOV); + } } } } --=20 2.52.0