linux-kernel - [RFC PATCH 09/10] vfio/type1: Pass iommu and dma objects through to vaddr_get

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Message-ID: <161401274019.16443.9688799433041636464.stgit@gimli.home>
Date:   Mon, 22 Feb 2021 09:52:20 -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: [RFC PATCH 09/10] 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 |   30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 5099b3c9dce0..b34ee4b96a4a 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -517,15 +517,16 @@ static int unmap_dma_pfn_list(struct vfio_iommu *iommu, struct vfio_dma *dma,
 	return 0;
 }
 
-static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr,
-			 int prot, unsigned long *pfn)
+static int vaddr_get_pfn(struct vfio_iommu *iommu, struct vfio_dma *dma,
+			 struct mm_struct *mm, unsigned long vaddr,
+			 unsigned long *pfn)
 {
 	struct page *page[1];
 	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);
@@ -543,7 +544,8 @@ static int vaddr_get_pfn(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;
 
@@ -615,7 +617,8 @@ 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)
 {
@@ -628,7 +631,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
 	if (!current->mm)
 		return -ENODEV;
 
-	ret = vaddr_get_pfn(current->mm, vaddr, dma->prot, pfn_base);
+	ret = vaddr_get_pfn(iommu, dma, current->mm, vaddr, pfn_base);
 	if (ret)
 		return ret;
 
@@ -655,7 +658,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
 	/* Lock all the consecutive pages from pfn_base */
 	for (vaddr += PAGE_SIZE, iova += PAGE_SIZE; pinned < npage;
 	     pinned++, vaddr += PAGE_SIZE, iova += PAGE_SIZE) {
-		ret = vaddr_get_pfn(current->mm, vaddr, dma->prot, &pfn);
+		ret = vaddr_get_pfn(iommu, dma, current->mm, vaddr, &pfn);
 		if (ret)
 			break;
 
@@ -715,7 +718,8 @@ 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 mm_struct *mm;
@@ -725,7 +729,7 @@ static int vfio_pin_page_external(struct vfio_dma *dma, unsigned long vaddr,
 	if (!mm)
 		return -ENODEV;
 
-	ret = vaddr_get_pfn(mm, vaddr, dma->prot, pfn_base);
+	ret = vaddr_get_pfn(iommu, dma, mm, vaddr, pfn_base);
 	if (!ret && do_accounting && !is_invalid_reserved_pfn(*pfn_base)) {
 		ret = vfio_lock_acct(dma, 1, true);
 		if (ret) {
@@ -833,8 +837,8 @@ 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;
 
@@ -1404,7 +1408,7 @@ 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);
 		if (npage <= 0) {
 			WARN_ON(!npage);
@@ -1660,7 +1664,7 @@ 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);
 				if (npage <= 0) {