Mao Wenan 9f489d3097 virtio_ring: Avoid loop when vq is broken in virtqueue_poll ... [ Upstream commit 481a0d7422 ] The loop may exist if vq->broken is true, virtqueue_get_buf_ctx_packed or virtqueue_get_buf_ctx_split will return NULL, so virtnet_poll will reschedule napi to receive packet, it will lead cpu usage(si) to 100%. call trace as below: virtnet_poll virtnet_receive virtqueue_get_buf_ctx virtqueue_get_buf_ctx_packed virtqueue_get_buf_ctx_split virtqueue_napi_complete virtqueue_poll //return true virtqueue_napi_schedule //it will reschedule napi to fix this, return false if vq is broken in virtqueue_poll. Signed-off-by: Mao Wenan <wenan.mao@linux.alibaba.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Link: https://lore.kernel.org/r/1596354249-96204-1-git-send-email-wenan.mao@linux.alibaba.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-08-26 10:31:01 +02:00
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Kconfig	virtio: make VIRTIO a menuconfig to ease disabling it all	2018-02-01 16:26:43 +02:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
virtio_balloon.c	virtio_balloon: prevent pfn array overflow	2020-02-24 08:34:54 +01:00
virtio_input.c	virtio: wrap find_vqs	2017-05-02 23:41:42 +03:00
virtio_mmio.c	virtio: mmio-v1: Validate queue PFN	2018-08-22 00:56:56 +03:00
virtio_pci_common.c	virtio_pci: fix a NULL pointer reference in vp_del_vqs	2019-05-10 17:54:08 +02:00
virtio_pci_common.h	virtio: Make vp_set_vq_affinity() take a mask.	2018-08-11 12:02:18 -07:00
virtio_pci_legacy.c	virtio: pci-legacy: Validate queue pfn	2018-08-22 00:56:58 +03:00
virtio_pci_modern.c	virtio_pci: support enabling VFs	2018-06-12 04:59:29 +03:00
virtio_ring.c	virtio_ring: Avoid loop when vq is broken in virtqueue_poll	2020-08-26 10:31:01 +02:00
virtio.c	virtio: split device_register into device_initialize and device_add	2018-02-01 16:26:45 +02:00