x86, pat: Lookup the protection from memtype list on vm_insert_pfn()

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>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 71aa6f7..b629f75 100644 (file)
--- 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;