linux-kernel - [RFC 05/16] vfio/type1: Pass mm to vfio_pin_pages

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Date:   Wed,  5 Jan 2022 19:46:45 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Alexander Duyck <alexanderduyck@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ben Segall <bsegall@...gle.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ingo Molnar <mingo@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Josh Triplett <josh@...htriplett.org>,
        Michal Hocko <mhocko@...e.com>, Nico Pache <npache@...hat.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Steve Sistare <steven.sistare@...cle.com>,
        Tejun Heo <tj@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-mm@...ck.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Daniel Jordan <daniel.m.jordan@...cle.com>
Subject: [RFC 05/16] vfio/type1: Pass mm to vfio_pin_pages_remote()

Refactoring for later, when padata helpers need to use the main thread's
mm.

Signed-off-by: Daniel Jordan <daniel.m.jordan@...cle.com>
---
 drivers/vfio/vfio_iommu_type1.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0b4f7c174c7a..26bb2d9b698b 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -649,10 +649,10 @@ static int vfio_wait_all_valid(struct vfio_iommu *iommu)
  */
 static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
 				  long npage, unsigned long *pfn_base,
-				  unsigned long limit, struct vfio_batch *batch)
+				  unsigned long limit, struct vfio_batch *batch,
+				  struct mm_struct *mm)
 {
 	unsigned long pfn;
-	struct mm_struct *mm = current->mm;
 	long ret, pinned = 0, lock_acct = 0;
 	bool rsvd;
 	dma_addr_t iova = vaddr - dma->vaddr + dma->iova;
@@ -1500,7 +1500,7 @@ static int vfio_pin_map_dma(struct vfio_iommu *iommu, struct vfio_dma *dma,
 		/* Pin a contiguous chunk of memory */
 		npage = vfio_pin_pages_remote(dma, vaddr + dma->size,
 					      size >> PAGE_SHIFT, &pfn, limit,
-					      &batch);
+					      &batch, current->mm);
 		if (npage <= 0) {
 			WARN_ON(!npage);
 			ret = (int)npage;
@@ -1763,7 +1763,8 @@ static int vfio_iommu_replay(struct vfio_iommu *iommu,
 				npage = vfio_pin_pages_remote(dma, vaddr,
 							      n >> PAGE_SHIFT,
 							      &pfn, limit,
-							      &batch);
+							      &batch,
+							      current->mm);
 				if (npage <= 0) {
 					WARN_ON(!npage);
 					ret = (int)npage;
-- 
2.34.1