From fed67a20ac94d4d985aa5bf5ac66102b0fd5211c Mon Sep 17 00:00:00 2001 From: Maxime Coquelin Date: Thu, 5 Oct 2017 10:36:19 +0200 Subject: [PATCH] vhost: introduce guest IOVA to backend VA helper This patch introduces vhost_iova_to_vva() function to translate guest's IO virtual addresses to backend's virtual addresses. When IOMMU is enabled, the IOTLB cache is queried to get the translation. If missing from the IOTLB cache, an IOTLB_MISS request is sent to Qemu, and IOTLB cache is queried again on IOTLB event notification. When IOMMU is disabled, the passed address is a guest's physical address, so the legacy rte_vhost_gpa_to_vva() API is used. Signed-off-by: Maxime Coquelin Acked-by: Yuanhan Liu --- lib/librte_vhost/vhost.c | 25 +++++++++++++++++++++++++ lib/librte_vhost/vhost.h | 13 +++++++++++++ 2 files changed, 38 insertions(+) diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c index 2493a7992e..6e55116545 100644 --- a/lib/librte_vhost/vhost.c +++ b/lib/librte_vhost/vhost.c @@ -47,12 +47,37 @@ #include #include #include +#include #include "iotlb.h" #include "vhost.h" +#include "vhost_user.h" struct virtio_net *vhost_devices[MAX_VHOST_DEVICE]; +uint64_t +__vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t iova, uint64_t size, uint8_t perm) +{ + uint64_t vva, tmp_size; + + if (unlikely(!size)) + return 0; + + tmp_size = size; + + vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm); + if (tmp_size == size) + return vva; + + if (!vhost_user_iotlb_pending_miss(vq, iova + tmp_size, perm)) { + vhost_user_iotlb_pending_insert(vq, iova + tmp_size, perm); + vhost_user_iotlb_miss(dev, iova + tmp_size, perm); + } + + return 0; +} + struct virtio_net * get_device(int vid) { diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h index 7600885963..2ea6c465ae 100644 --- a/lib/librte_vhost/vhost.h +++ b/lib/librte_vhost/vhost.h @@ -375,4 +375,17 @@ struct vhost_device_ops const *vhost_driver_callback_get(const char *path); */ void vhost_backend_cleanup(struct virtio_net *dev); +uint64_t __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t iova, uint64_t size, uint8_t perm); + +static __rte_always_inline uint64_t +vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, + uint64_t iova, uint64_t size, uint8_t perm) +{ + if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) + return rte_vhost_gpa_to_vva(dev->mem, iova); + + return __vhost_iova_to_vva(dev, vq, iova, size, perm); +} + #endif /* _VHOST_NET_CDEV_H_ */ -- 2.20.1