From 345cc1cbcbce2bab00abc2b88338d7d89c702d6b Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Fri, 16 Dec 2022 11:35:52 +0800 Subject: [PATCH] vhost: fix vq dirty bitmap syncing when vIOMMU is enabled When vIOMMU is enabled, the vq->used_phys is actually the IOVA not GPA. So we need to translate it to GPA before the syncing otherwise we may hit the following crash since IOVA could be out of the scope of the GPA log size. This could be noted when using virtio-IOMMU with vhost using 1G memory. Fixes: c471ad0e9bd46 ("vhost_net: device IOTLB support") Cc: qemu-stable@nongnu.org Tested-by: Lei Yang Reported-by: Yalan Zhang Signed-off-by: Jason Wang Message-Id: <20221216033552.77087-1-jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/vhost.c | 84 ++++++++++++++++++++++++++++++++++++----------- 1 file changed, 64 insertions(+), 20 deletions(-) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index 7fb008bc9e25..fdcd1a8fdf4f 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -20,6 +20,7 @@ #include "qemu/range.h" #include "qemu/error-report.h" #include "qemu/memfd.h" +#include "qemu/log.h" #include "standard-headers/linux/vhost_types.h" #include "hw/virtio/virtio-bus.h" #include "hw/virtio/virtio-access.h" @@ -106,6 +107,24 @@ static void vhost_dev_sync_region(struct vhost_dev *dev, } } +static bool vhost_dev_has_iommu(struct vhost_dev *dev) +{ + VirtIODevice *vdev = dev->vdev; + + /* + * For vhost, VIRTIO_F_IOMMU_PLATFORM means the backend support + * incremental memory mapping API via IOTLB API. For platform that + * does not have IOMMU, there's no need to enable this feature + * which may cause unnecessary IOTLB miss/update transactions. + */ + if (vdev) { + return virtio_bus_device_iommu_enabled(vdev) && + virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); + } else { + return false; + } +} + static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, MemoryRegionSection *section, hwaddr first, @@ -137,8 +156,51 @@ static int vhost_sync_dirty_bitmap(struct vhost_dev *dev, continue; } - vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys, - range_get_last(vq->used_phys, vq->used_size)); + if (vhost_dev_has_iommu(dev)) { + IOMMUTLBEntry iotlb; + hwaddr used_phys = vq->used_phys, used_size = vq->used_size; + hwaddr phys, s, offset; + + while (used_size) { + rcu_read_lock(); + iotlb = address_space_get_iotlb_entry(dev->vdev->dma_as, + used_phys, + true, + MEMTXATTRS_UNSPECIFIED); + rcu_read_unlock(); + + if (!iotlb.target_as) { + qemu_log_mask(LOG_GUEST_ERROR, "translation " + "failure for used_iova %"PRIx64"\n", + used_phys); + return -EINVAL; + } + + offset = used_phys & iotlb.addr_mask; + phys = iotlb.translated_addr + offset; + + /* + * Distance from start of used ring until last byte of + * IOMMU page. + */ + s = iotlb.addr_mask - offset; + /* + * Size of used ring, or of the part of it until end + * of IOMMU page. To avoid zero result, do the adding + * outside of MIN(). + */ + s = MIN(s, used_size - 1) + 1; + + vhost_dev_sync_region(dev, section, start_addr, end_addr, phys, + range_get_last(phys, s)); + used_size -= s; + used_phys += s; + } + } else { + vhost_dev_sync_region(dev, section, start_addr, + end_addr, vq->used_phys, + range_get_last(vq->used_phys, vq->used_size)); + } } return 0; } @@ -306,24 +368,6 @@ static inline void vhost_dev_log_resize(struct vhost_dev *dev, uint64_t size) dev->log_size = size; } -static bool vhost_dev_has_iommu(struct vhost_dev *dev) -{ - VirtIODevice *vdev = dev->vdev; - - /* - * For vhost, VIRTIO_F_IOMMU_PLATFORM means the backend support - * incremental memory mapping API via IOTLB API. For platform that - * does not have IOMMU, there's no need to enable this feature - * which may cause unnecessary IOTLB miss/update transactions. - */ - if (vdev) { - return virtio_bus_device_iommu_enabled(vdev) && - virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); - } else { - return false; - } -} - static void *vhost_memory_map(struct vhost_dev *dev, hwaddr addr, hwaddr *plen, bool is_write) {