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vfio/type1: track locked_vm per dma

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commit 18e292705b upstream.

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

Fixes: c3cbab24db ("vfio/type1: implement interfaces to update vaddr")
Cc: stable@vger.kernel.org
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/1675184289-267876-4-git-send-email-steven.sistare@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steve Sistare 2023-01-31 08:58:05 -08:00 committed by Greg Kroah-Hartman
parent eafb81c50d
commit 7329ab7f02
1 changed files with 17 additions and 6 deletions
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23
drivers/vfio/vfio_iommu_type1.c
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@ -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 {
@ -417,6 +418,19 @@ 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;
@ -429,12 +443,9 @@ 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);