[PATCH 6.1 876/885] vfio/type1: track locked_vm per dma

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Steve Sistare <steven.sistare@xxxxxxxxxx>

commit 18e292705ba21cc9b3227b9ad5b1c28973605ee5 upstream.

Track locked_vm per dma struct, and create a new subroutine, both for use
in a subsequent patch.  No functional change.

Fixes: c3cbab24db38 ("vfio/type1: implement interfaces to update vaddr")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Steve Sistare <steven.sistare@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Link: https://lore.kernel.org/r/1675184289-267876-4-git-send-email-steven.sistare@xxxxxxxxxx
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/vfio/vfio_iommu_type1.c |   23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

--- 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
 	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_dm
 	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);





[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux