Nesting translation allows two-levels/stages page tables, with 1st level for guest translations (e.g. GVA->GPA), 2nd level for host translations (e.g. GPA->HPA). This patch adds interface for binding guest page tables to a PASID. This PASID must have been allocated to user space before the binding request. Cc: Kevin Tian <kevin.tian@xxxxxxxxx> CC: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> Cc: Alex Williamson <alex.williamson@xxxxxxxxxx> Cc: Eric Auger <eric.auger@xxxxxxxxxx> Cc: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> Cc: Joerg Roedel <joro@xxxxxxxxxx> Cc: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx> Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx> --- v3 -> v4: *) address comments from Alex on v3 v2 -> v3: *) use __iommu_sva_unbind_gpasid() for unbind call issued by VFIO https://lore.kernel.org/linux-iommu/1592931837-58223-6-git-send-email-jacob.jun.pan@xxxxxxxxxxxxxxx/ v1 -> v2: *) rename subject from "vfio/type1: Bind guest page tables to host" *) remove VFIO_IOMMU_BIND, introduce VFIO_IOMMU_NESTING_OP to support bind/ unbind guet page table *) replaced vfio_iommu_for_each_dev() with a group level loop since this series enforces one group per container w/ nesting type as start. *) rename vfio_bind/unbind_gpasid_fn() to vfio_dev_bind/unbind_gpasid_fn() *) vfio_dev_unbind_gpasid() always successful *) use vfio_mm->pasid_lock to avoid race between PASID free and page table bind/unbind --- drivers/vfio/vfio_iommu_type1.c | 166 ++++++++++++++++++++++++++++++++++++++++ drivers/vfio/vfio_pasid.c | 30 ++++++++ include/linux/vfio.h | 20 +++++ include/uapi/linux/vfio.h | 30 ++++++++ 4 files changed, 246 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 29726ca..6de0b8e 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -149,6 +149,30 @@ struct vfio_regions { #define DIRTY_BITMAP_PAGES_MAX ((u64)INT_MAX) #define DIRTY_BITMAP_SIZE_MAX DIRTY_BITMAP_BYTES(DIRTY_BITMAP_PAGES_MAX) +struct domain_capsule { + struct vfio_group *group; + struct iommu_domain *domain; + void *data; +}; + +/* iommu->lock must be held */ +static struct vfio_group *vfio_find_nesting_group(struct vfio_iommu *iommu) +{ + struct vfio_domain *d; + struct vfio_group *group = NULL; + + if (!iommu->nesting_info) + return NULL; + + /* only support singleton container with nesting type */ + list_for_each_entry(d, &iommu->domain_list, next) { + list_for_each_entry(group, &d->group_list, next) { + break; + } + } + return group; +} + static int put_pfn(unsigned long pfn, int prot); static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu, @@ -2352,6 +2376,48 @@ static int vfio_iommu_resv_refresh(struct vfio_iommu *iommu, return ret; } +static int vfio_dev_bind_gpasid_fn(struct device *dev, void *data) +{ + struct domain_capsule *dc = (struct domain_capsule *)data; + unsigned long arg = *(unsigned long *) dc->data; + + return iommu_sva_bind_gpasid(dc->domain, dev, (void __user *) arg); +} + +static int vfio_dev_unbind_gpasid_fn(struct device *dev, void *data) +{ + struct domain_capsule *dc = (struct domain_capsule *)data; + unsigned long arg = *(unsigned long *) dc->data; + + iommu_sva_unbind_gpasid(dc->domain, dev, (void __user *) arg); + return 0; +} + +static int __vfio_dev_unbind_gpasid_fn(struct device *dev, void *data) +{ + struct domain_capsule *dc = (struct domain_capsule *)data; + struct iommu_gpasid_bind_data *unbind_data = + (struct iommu_gpasid_bind_data *) dc->data; + + __iommu_sva_unbind_gpasid(dc->domain, dev, unbind_data); + return 0; +} + +static void vfio_group_unbind_gpasid_fn(ioasid_t pasid, void *data) +{ + struct domain_capsule *dc = (struct domain_capsule *) data; + struct iommu_gpasid_bind_data unbind_data; + + unbind_data.argsz = offsetof(struct iommu_gpasid_bind_data, vendor); + unbind_data.flags = 0; + unbind_data.hpasid = pasid; + + dc->data = &unbind_data; + + iommu_group_for_each_dev(dc->group->iommu_group, + dc, __vfio_dev_unbind_gpasid_fn); +} + static void vfio_iommu_type1_detach_group(void *iommu_data, struct iommu_group *iommu_group) { @@ -2395,6 +2461,21 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, if (!group) continue; + if (iommu->nesting_info && iommu->vmm && + (iommu->nesting_info->features & + IOMMU_NESTING_FEAT_BIND_PGTBL)) { + struct domain_capsule dc = { .group = group, + .domain = domain->domain, + .data = NULL }; + + /* + * Unbind page tables bound with system wide PASIDs + * which are allocated to user space. + */ + vfio_mm_for_each_pasid(iommu->vmm, &dc, + vfio_group_unbind_gpasid_fn); + } + vfio_iommu_detach_group(domain, group); update_dirty_scope = !group->pinned_page_dirty_scope; list_del(&group->next); @@ -2942,6 +3023,89 @@ static int vfio_iommu_type1_pasid_request(struct vfio_iommu *iommu, } } +static long vfio_iommu_handle_pgtbl_op(struct vfio_iommu *iommu, + bool is_bind, unsigned long arg) +{ + struct iommu_nesting_info *info; + struct domain_capsule dc = { .data = &arg }; + struct vfio_group *group; + struct vfio_domain *domain; + int ret; + + mutex_lock(&iommu->lock); + + info = iommu->nesting_info; + if (!info || !(info->features & IOMMU_NESTING_FEAT_BIND_PGTBL)) { + ret = -EOPNOTSUPP; + goto out_unlock_iommu; + } + + if (!iommu->vmm) { + ret = -EINVAL; + goto out_unlock_iommu; + } + + group = vfio_find_nesting_group(iommu); + if (!group) { + ret = -EINVAL; + goto out_unlock_iommu; + } + + domain = list_first_entry(&iommu->domain_list, + struct vfio_domain, next); + dc.group = group; + dc.domain = domain->domain; + + /* Avoid race with other containers within the same process */ + vfio_mm_pasid_lock(iommu->vmm); + + if (is_bind) { + ret = iommu_group_for_each_dev(group->iommu_group, &dc, + vfio_dev_bind_gpasid_fn); + if (ret) + iommu_group_for_each_dev(group->iommu_group, &dc, + vfio_dev_unbind_gpasid_fn); + } else { + iommu_group_for_each_dev(group->iommu_group, + &dc, vfio_dev_unbind_gpasid_fn); + ret = 0; + } + + vfio_mm_pasid_unlock(iommu->vmm); +out_unlock_iommu: + mutex_unlock(&iommu->lock); + return ret; +} + +static long vfio_iommu_type1_nesting_op(struct vfio_iommu *iommu, + unsigned long arg) +{ + struct vfio_iommu_type1_nesting_op hdr; + unsigned int minsz; + int ret; + + minsz = offsetofend(struct vfio_iommu_type1_nesting_op, flags); + + if (copy_from_user(&hdr, (void __user *)arg, minsz)) + return -EFAULT; + + if (hdr.argsz < minsz || hdr.flags & ~VFIO_NESTING_OP_MASK) + return -EINVAL; + + switch (hdr.flags & VFIO_NESTING_OP_MASK) { + case VFIO_IOMMU_NESTING_OP_BIND_PGTBL: + ret = vfio_iommu_handle_pgtbl_op(iommu, true, arg + minsz); + break; + case VFIO_IOMMU_NESTING_OP_UNBIND_PGTBL: + ret = vfio_iommu_handle_pgtbl_op(iommu, false, arg + minsz); + break; + default: + ret = -EINVAL; + } + + return ret; +} + static long vfio_iommu_type1_ioctl(void *iommu_data, unsigned int cmd, unsigned long arg) { @@ -2960,6 +3124,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, return vfio_iommu_type1_dirty_pages(iommu, arg); case VFIO_IOMMU_PASID_REQUEST: return vfio_iommu_type1_pasid_request(iommu, arg); + case VFIO_IOMMU_NESTING_OP: + return vfio_iommu_type1_nesting_op(iommu, arg); } return -ENOTTY; diff --git a/drivers/vfio/vfio_pasid.c b/drivers/vfio/vfio_pasid.c index 6f907db..bbfbea8 100644 --- a/drivers/vfio/vfio_pasid.c +++ b/drivers/vfio/vfio_pasid.c @@ -29,6 +29,7 @@ struct vfio_mm_token { struct vfio_mm { struct kref kref; int ioasid_sid; + struct mutex pasid_lock; struct list_head next; struct vfio_mm_token token; }; @@ -98,6 +99,7 @@ struct vfio_mm *vfio_mm_get_from_task(struct task_struct *task) kref_init(&vmm->kref); vmm->token.val = val; + mutex_init(&vmm->pasid_lock); list_add(&vmm->next, &vfio_pasid.vfio_mm_list); out: @@ -135,12 +137,40 @@ void vfio_pasid_free_range(struct vfio_mm *vmm, * IOASID core will notify PASID users (e.g. IOMMU driver) to * teardown necessary structures depending on the to-be-freed * PASID. + * Hold pasid_lock to avoid race with PASID usages like bind/ + * unbind page tables to requested PASID. */ + mutex_lock(&vmm->pasid_lock); for (; pasid <= max; pasid++) ioasid_free(pasid); + mutex_unlock(&vmm->pasid_lock); } EXPORT_SYMBOL_GPL(vfio_pasid_free_range); +int vfio_mm_for_each_pasid(struct vfio_mm *vmm, void *data, + void (*fn)(ioasid_t id, void *data)) +{ + int ret; + + mutex_lock(&vmm->pasid_lock); + ret = ioasid_set_for_each_ioasid(vmm->ioasid_sid, fn, data); + mutex_unlock(&vmm->pasid_lock); + return ret; +} +EXPORT_SYMBOL_GPL(vfio_mm_for_each_pasid); + +void vfio_mm_pasid_lock(struct vfio_mm *vmm) +{ + mutex_lock(&vmm->pasid_lock); +} +EXPORT_SYMBOL_GPL(vfio_mm_pasid_lock); + +void vfio_mm_pasid_unlock(struct vfio_mm *vmm) +{ + mutex_unlock(&vmm->pasid_lock); +} +EXPORT_SYMBOL_GPL(vfio_mm_pasid_unlock); + static int __init vfio_pasid_init(void) { mutex_init(&vfio_pasid.vfio_mm_lock); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 35c922a..8052f1c2 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -105,6 +105,11 @@ int vfio_mm_ioasid_sid(struct vfio_mm *vmm); extern int vfio_pasid_alloc(struct vfio_mm *vmm, int min, int max); extern void vfio_pasid_free_range(struct vfio_mm *vmm, ioasid_t min, ioasid_t max); +extern int vfio_mm_for_each_pasid(struct vfio_mm *vmm, void *data, + void (*fn)(ioasid_t id, void *data)); +extern void vfio_mm_pasid_lock(struct vfio_mm *vmm); +extern void vfio_mm_pasid_unlock(struct vfio_mm *vmm); + #else static inline struct vfio_mm *vfio_mm_get_from_task(struct task_struct *task) { @@ -129,6 +134,21 @@ static inline void vfio_pasid_free_range(struct vfio_mm *vmm, ioasid_t min, ioasid_t max) { } + +static inline int vfio_mm_for_each_pasid(struct vfio_mm *vmm, void *data, + void (*fn)(ioasid_t id, void *data)) +{ + return -ENOTTY; +} + +static inline void vfio_mm_pasid_lock(struct vfio_mm *vmm) +{ +} + +static inline void vfio_mm_pasid_unlock(struct vfio_mm *vmm) +{ +} + #endif /* CONFIG_VFIO_PASID */ /* diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index fe267b8e..095a52a 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -1205,6 +1205,36 @@ struct vfio_iommu_type1_pasid_request { #define VFIO_IOMMU_PASID_REQUEST _IO(VFIO_TYPE, VFIO_BASE + 18) +/** + * VFIO_IOMMU_NESTING_OP - _IOW(VFIO_TYPE, VFIO_BASE + 19, + * struct vfio_iommu_type1_nesting_op) + * + * This interface allows user space to utilize the nesting IOMMU + * capabilities as reported through VFIO_IOMMU_GET_INFO. + * + * @data[] types defined for each op: + * +=================+===============================================+ + * | NESTING OP | @data[] | + * +=================+===============================================+ + * | BIND_PGTBL | struct iommu_gpasid_bind_data | + * +-----------------+-----------------------------------------------+ + * | UNBIND_PGTBL | struct iommu_gpasid_bind_data | + * +-----------------+-----------------------------------------------+ + * + * returns: 0 on success, -errno on failure. + */ +struct vfio_iommu_type1_nesting_op { + __u32 argsz; + __u32 flags; +#define VFIO_NESTING_OP_MASK (0xffff) /* lower 16-bits for op */ + __u8 data[]; +}; + +#define VFIO_IOMMU_NESTING_OP_BIND_PGTBL (0) +#define VFIO_IOMMU_NESTING_OP_UNBIND_PGTBL (1) + +#define VFIO_IOMMU_NESTING_OP _IO(VFIO_TYPE, VFIO_BASE + 19) + /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */ /* -- 2.7.4
