linux-kernel - [PATCH v1 10/14] vfio/type1: Pass iommu and dma objects through to vaddr_get

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Date:   Mon, 08 Mar 2021 14:49:06 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     alex.williamson@...hat.com
Cc:     cohuck@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jgg@...dia.com, peterx@...hat.com
Subject: [PATCH v1 10/14] vfio/type1: Pass iommu and dma objects through to
 vaddr_get_pfn

We'll need these to track vfio device mappings.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 drivers/vfio/vfio_iommu_type1.c |   28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index f7d35a114354..f22c07a40521 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -579,15 +579,16 @@ static int unmap_dma_pfn_list(struct vfio_iommu *iommu, struct vfio_dma *dma,
  * Returns the positive number of pfns successfully obtained or a negative
  * error code.
  */
-static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
-			  long npages, int prot, unsigned long *pfn,
+static int vaddr_get_pfns(struct vfio_iommu *iommu, struct vfio_dma *dma,
+			  struct mm_struct *mm, unsigned long vaddr,
+			  long npages, unsigned long *pfn,
 			  struct page **pages)
 {
 	struct vm_area_struct *vma;
 	unsigned int flags = 0;
 	int ret;
 
-	if (prot & IOMMU_WRITE)
+	if (dma->prot & IOMMU_WRITE)
 		flags |= FOLL_WRITE;
 
 	mmap_read_lock(mm);
@@ -604,7 +605,8 @@ static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
 	vma = find_vma_intersection(mm, vaddr, vaddr + 1);
 
 	if (vma && vma->vm_flags & VM_PFNMAP) {
-		ret = follow_fault_pfn(vma, mm, vaddr, pfn, prot & IOMMU_WRITE);
+		ret = follow_fault_pfn(vma, mm, vaddr, pfn,
+				       dma->prot & IOMMU_WRITE);
 		if (ret == -EAGAIN)
 			goto retry;
 
@@ -680,7 +682,8 @@ static int vfio_wait_all_valid(struct vfio_iommu *iommu)
  * the iommu can only map chunks of consecutive pfns anyway, so get the
  * first page and all consecutive pages with the same locking.
  */
-static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
+static long vfio_pin_pages_remote(struct vfio_iommu *iommu,
+				  struct vfio_dma *dma, unsigned long vaddr,
 				  long npage, unsigned long *pfn_base,
 				  unsigned long limit, struct vfio_batch *batch)
 {
@@ -708,7 +711,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
 			/* Empty batch, so refill it. */
 			long req_pages = min_t(long, npage, batch->capacity);
 
-			ret = vaddr_get_pfns(mm, vaddr, req_pages, dma->prot,
+			ret = vaddr_get_pfns(iommu, dma, mm, vaddr, req_pages,
 					     &pfn, batch->pages);
 			if (ret < 0)
 				goto unpin_out;
@@ -806,7 +809,8 @@ static long vfio_unpin_pages_remote(struct vfio_dma *dma, dma_addr_t iova,
 	return unlocked;
 }
 
-static int vfio_pin_page_external(struct vfio_dma *dma, unsigned long vaddr,
+static int vfio_pin_page_external(struct vfio_iommu *iommu,
+				  struct vfio_dma *dma, unsigned long vaddr,
 				  unsigned long *pfn_base, bool do_accounting)
 {
 	struct page *pages[1];
@@ -817,7 +821,7 @@ static int vfio_pin_page_external(struct vfio_dma *dma, unsigned long vaddr,
 	if (!mm)
 		return -ENODEV;
 
-	ret = vaddr_get_pfns(mm, vaddr, 1, dma->prot, pfn_base, pages);
+	ret = vaddr_get_pfns(iommu, dma, mm, vaddr, 1, pfn_base, pages);
 	if (ret == 1 && do_accounting && !is_invalid_reserved_pfn(*pfn_base)) {
 		ret = vfio_lock_acct(dma, 1, true);
 		if (ret) {
@@ -925,8 +929,8 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data,
 		}
 
 		remote_vaddr = dma->vaddr + (iova - dma->iova);
-		ret = vfio_pin_page_external(dma, remote_vaddr, &phys_pfn[i],
-					     do_accounting);
+		ret = vfio_pin_page_external(iommu, dma, remote_vaddr,
+					     &phys_pfn[i], do_accounting);
 		if (ret)
 			goto pin_unwind;
 
@@ -1497,7 +1501,7 @@ static int vfio_pin_map_dma(struct vfio_iommu *iommu, struct vfio_dma *dma,
 
 	while (size) {
 		/* Pin a contiguous chunk of memory */
-		npage = vfio_pin_pages_remote(dma, vaddr + dma->size,
+		npage = vfio_pin_pages_remote(iommu, dma, vaddr + dma->size,
 					      size >> PAGE_SHIFT, &pfn, limit,
 					      &batch);
 		if (npage <= 0) {
@@ -1759,7 +1763,7 @@ static int vfio_iommu_replay(struct vfio_iommu *iommu,
 				size_t n = dma->iova + dma->size - iova;
 				long npage;
 
-				npage = vfio_pin_pages_remote(dma, vaddr,
+				npage = vfio_pin_pages_remote(iommu, dma, vaddr,
 							      n >> PAGE_SHIFT,
 							      &pfn, limit,
 							      &batch);