From: "Liu, Yi L" <[email protected]> This patch adds the VFIO_IOMMU_TLB_INVALIDATE ioctl with aims at propagating stage1 IOMMU TLB invalidations from guest to host.
In the case of SVM virtualization on VT-d, host IOMMU driver has no knowledge of caching structure updates unless the guest invalidation activities are passed down to the host. So a new IOCTL is needed to propagate the guest cache invalidation through VFIO. Signed-off-by: Liu, Yi L <[email protected]> Signed-off-by: Eric Auger <[email protected]> --- For SMMUv3 invalidations, the device parameter is not needed --- drivers/vfio/vfio_iommu_type1.c | 23 +++++++++++++++++++++++ include/uapi/linux/vfio.h | 7 +++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 83c7f96..973bb4d 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -1687,6 +1687,15 @@ static int bind_guest_stage_fn(struct device *dev, void *data) return iommu_bind_guest_stage(task->domain, dev, &ustruct->config); } +static int do_tlb_inv_fn(struct device *dev, void *data) +{ + struct vfio_iommu_type1_tlb_invalidate *ustruct; + struct vfio_iommu_task *task = data; + + ustruct = task->payload; + return iommu_tlb_invalidate(task->domain, dev, &ustruct->info); +} + static int vfio_iommu_dispatch_task(struct vfio_iommu *iommu, void *data, int (*fn)(struct device *, void *)) { @@ -1799,6 +1808,20 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, return vfio_iommu_dispatch_task(iommu, (u8 *)&ustruct, bind_guest_stage_fn); + } else if (cmd == VFIO_IOMMU_TLB_INVALIDATE) { + struct vfio_iommu_type1_tlb_invalidate ustruct; + + minsz = offsetofend(struct vfio_iommu_type1_tlb_invalidate, + info); + + if (copy_from_user(&ustruct, (void __user *)arg, minsz)) + return -EFAULT; + + if (ustruct.argsz < minsz || ustruct.flags) + return -EINVAL; + + return vfio_iommu_dispatch_task(iommu, (u8 *)&ustruct, + do_tlb_inv_fn); } return -ENOTTY; diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index a5801ed..b59f9fc 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -673,6 +673,13 @@ struct vfio_iommu_type1_bind_guest_stage { }; #define VFIO_IOMMU_BIND_GUEST_STAGE _IO(VFIO_TYPE, VFIO_BASE + 22) +struct vfio_iommu_type1_tlb_invalidate { + __u32 argsz; + __u32 flags; + struct iommu_tlb_invalidate_info info; +}; +#define VFIO_IOMMU_TLB_INVALIDATE _IO(VFIO_TYPE, VFIO_BASE + 23) + /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */ /* -- 2.5.5 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
