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Subject[PATCH 09/10] x86, PAT: lookup the protection from memtype list on vm_insert_pfn()
Date
Lookup the reserved memtype during vm_insert_pfn and use that memtype
for the new mapping. This takes care or handling of vm_insert_pfn()
interface in track_pfn_vma*/untrack_pfn_vma.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---
arch/x86/mm/pat.c | 24 +++++++++---------------
1 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 71aa6f7..b629f75 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -848,11 +848,6 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
unsigned long vma_size = vma->vm_end - vma->vm_start;
pgprot_t pgprot;

- /*
- * For now, only handle remap_pfn_range() vmas where
- * is_linear_pfn_mapping() == TRUE. Handling of
- * vm_insert_pfn() is TBD.
- */
if (is_linear_pfn_mapping(vma)) {
/*
* reserve the whole chunk covered by vma. We need the
@@ -880,20 +875,24 @@ int track_pfn_vma_copy(struct vm_area_struct *vma)
int track_pfn_vma_new(struct vm_area_struct *vma, pgprot_t *prot,
unsigned long pfn, unsigned long size)
{
+ unsigned long flags;
resource_size_t paddr;
unsigned long vma_size = vma->vm_end - vma->vm_start;

- /*
- * For now, only handle remap_pfn_range() vmas where
- * is_linear_pfn_mapping() == TRUE. Handling of
- * vm_insert_pfn() is TBD.
- */
if (is_linear_pfn_mapping(vma)) {
/* reserve the whole chunk starting from vm_pgoff */
paddr = (resource_size_t)vma->vm_pgoff << PAGE_SHIFT;
return reserve_pfn_range(paddr, vma_size, prot, 0);
}

+ if (!pat_enabled)
+ return 0;
+
+ /* for vm_insert_pfn and friends, we set prot based on lookup */
+ flags = lookup_memtype(pfn << PAGE_SHIFT);
+ *prot = __pgprot((pgprot_val(vma->vm_page_prot) & (~_PAGE_CACHE_MASK)) |
+ flags);
+
return 0;
}

@@ -908,11 +907,6 @@ void untrack_pfn_vma(struct vm_area_struct *vma, unsigned long pfn,
resource_size_t paddr;
unsigned long vma_size = vma->vm_end - vma->vm_start;

- /*
- * For now, only handle remap_pfn_range() vmas where
- * is_linear_pfn_mapping() == TRUE. Handling of
- * vm_insert_pfn() is TBD.
- */
if (is_linear_pfn_mapping(vma)) {
/* free the whole chunk starting from vm_pgoff */
paddr = (resource_size_t)vma->vm_pgoff << PAGE_SHIFT;
--
1.6.0.6


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