diff options
| -rw-r--r-- | drivers/vfio/vfio_iommu_type1.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 6b757d035457..372d91b6a2f6 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -101,6 +101,7 @@ struct vfio_dma { struct rb_root pfn_list; /* Ex-user pinned pfn list */ unsigned long *bitmap; struct mm_struct *mm; + size_t locked_vm; }; struct vfio_batch { @@ -413,6 +414,19 @@ static int vfio_iova_put_vfio_pfn(struct vfio_dma *dma, struct vfio_pfn *vpfn) return ret; } +static int mm_lock_acct(struct task_struct *task, struct mm_struct *mm, + bool lock_cap, long npage) +{ + int ret = mmap_write_lock_killable(mm); + + if (ret) + return ret; + + ret = __account_locked_vm(mm, abs(npage), npage > 0, task, lock_cap); + mmap_write_unlock(mm); + return ret; +} + static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async) { struct mm_struct *mm; @@ -425,12 +439,9 @@ static int vfio_lock_acct(struct vfio_dma *dma, long npage, bool async) if (async && !mmget_not_zero(mm)) return -ESRCH; /* process exited */ - ret = mmap_write_lock_killable(mm); - if (!ret) { - ret = __account_locked_vm(mm, abs(npage), npage > 0, dma->task, - dma->lock_cap); - mmap_write_unlock(mm); - } + ret = mm_lock_acct(dma->task, mm, dma->lock_cap, npage); + if (!ret) + dma->locked_vm += npage; if (async) mmput(mm); |