[PATCH 2/4] iommu/amd: Correctly set flags for handle_mm_fault call

Joerg Roedel
2015-11-10T13:27:40Z

From: Joerg Roedel <jroedel@suse.de>

Instead of just checking for a write access, calculate the
flags that are passed to handle_mm_fault() more precisly and
use the pre-defined macros.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/amd_iommu_v2.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 612f7c8..afa8f9c 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -513,16 +513,20 @@ static bool access_error(struct vm_area_struct *vma, struct fault *fault)
static void do_fault(struct work_struct *work)
{
struct fault *fault = container_of(work, struct fault, work);
- struct mm_struct *mm;
struct vm_area_struct *vma;
+ unsigned int flags = 0;
+ struct mm_struct *mm;
u64 address;
- int ret, write;
-
- write = !!(fault->flags & PPR_FAULT_WRITE);
+ int ret;

mm = fault->state->mm;
address = fault->address;

+ if (fault->flags & PPR_FAULT_USER)
+ flags |= FAULT_FLAG_USER;
+ if (fault->flags & PPR_FAULT_WRITE)
+ flags |= FAULT_FLAG_WRITE;
+
down_read(&mm->mmap_sem);
vma = find_extend_vma(mm, address);
if (!vma || address < vma->vm_start) {
@@ -539,7 +543,7 @@ static void do_fault(struct work_struct *work)
goto out;
}

- ret = handle_mm_fault(mm, vma, address, write);
+ ret = handle_mm_fault(mm, vma, address, flags);
if (ret & VM_FAULT_ERROR) {
/* failed to service fault */
up_read(&mm->mmap_sem);
--
1.9.1