From 10981da02263ecc5e73e55ad1159d23009e3703c Mon Sep 17 00:00:00 2001 From: Zhenzhong Duan Date: Thu, 25 Jan 2024 15:37:05 +0800 Subject: [PATCH] virtio_iommu: Clear IOMMUPciBus pointer cache when system reset s->iommu_pcibus_by_bus_num is a IOMMUPciBus pointer cache indexed by bus number, bus number may not always be a fixed value, i.e., guest reboot to different kernel which set bus number with different algorithm. This could lead to endpoint binding to wrong iommu MR in virtio_iommu_get_endpoint(), then vfio device setup wrong mapping from other device. Remove the memset in virtio_iommu_device_realize() to avoid redundancy with memset in system reset. Signed-off-by: Zhenzhong Duan Message-Id: <20240125073706.339369-2-zhenzhong.duan@intel.com> Reviewed-by: Eric Auger Tested-by: Eric Auger Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit 9a457383ce9d309d4679b079fafb51f0a2d949aa) Signed-off-by: Michael Tokarev --- hw/virtio/virtio-iommu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index eb82462c95..95db19f144 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -1140,6 +1140,8 @@ static void virtio_iommu_system_reset(void *opaque) trace_virtio_iommu_system_reset(); + memset(s->iommu_pcibus_by_bus_num, 0, sizeof(s->iommu_pcibus_by_bus_num)); + /* * config.bypass is sticky across device reset, but should be restored on * system reset @@ -1156,8 +1158,6 @@ static void virtio_iommu_device_realize(DeviceState *dev, Error **errp) virtio_init(vdev, VIRTIO_ID_IOMMU, sizeof(struct virtio_iommu_config)); - memset(s->iommu_pcibus_by_bus_num, 0, sizeof(s->iommu_pcibus_by_bus_num)); - s->req_vq = virtio_add_queue(vdev, VIOMMU_DEFAULT_QUEUE_SIZE, virtio_iommu_handle_command); s->event_vq = virtio_add_queue(vdev, VIOMMU_DEFAULT_QUEUE_SIZE, NULL);