lkml.org 
[lkml]   [2021]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[RFC PATCH 09/10] vfio/type1: Pass iommu and dma objects through to vaddr_get_pfn
From
Date
We'll need these to track vfio device mappings.

Signed-off-by: Alex Williamson <alex.williamson@redhat.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) {
\
 
 \ /
  Last update: 2021-02-22 17:57    [W:0.121 / U:4.328 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site