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Tsirkin" , Jason Wang Cc: Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , virtualization@lists.linux.dev, Andrew Stellman Subject: [PATCH 0/4] virtio: fix four bugs across mmio, pci, and vring Date: Tue, 7 Apr 2026 08:39:00 -0400 Message-ID: <20260407123904.6390-1-astellman@stellman-greene.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Four independent fixes across the virtio subsystem: 1. virtio-mmio: vm_reset() returns without polling for the status register to read back as 0, violating the spec. Add a poll loop matching the existing pattern in virtio-pci's vp_reset(). 2. virtio-pci: vp_find_vqs_intx() uses a sequential counter instead of avq->vq_index for the admin VQ, unlike the MSI-X path. 3. virtio-pci: vp_interrupt() returns IRQ_NONE for config-change-only interrupts because it unconditionally returns vp_vring_interrupt()'s result. Track the config-change handling and return IRQ_HANDLED. 4. virtio_ring: vring_transport_features() clears VIRTIO_F_RING_RESET during feature negotiation because it is missing from the whitelist. Andrew Stellman (4): virtio-mmio: wait for status readback after reset virtio-pci: use avq->vq_index for admin VQ in INTx path virtio-pci: return IRQ_HANDLED for config-change interrupts virtio_ring: preserve VIRTIO_F_RING_RESET in transport features drivers/virtio/virtio_mmio.c | 3 +++ drivers/virtio/virtio_pci_common.c | 12 +++++++++--- drivers/virtio/virtio_ring.c | 2 ++ 3 files changed, 14 insertions(+), 3 deletions(-) -- 2.34.1