[Xen-devel] [PATCH 6/8] x86/xen: do not use _PAGE_IOMAP in xen_remap_domain_mfn_range()

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

_PAGE_IOMAP is used in xen_remap_domain_mfn_range() to prevent the
pfn_pte() call in remap_area_mfn_pte_fn() from using the p2m to translate
the MFN.  If mfn_pte() is used instead, the p2m look up is avoided and
the use of _PAGE_IOMAP is no longer needed.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 arch/x86/xen/mmu.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 256282e..b36116e 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2523,7 +2523,7 @@ static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t 
token,
                                 unsigned long addr, void *data)
 {
        struct remap_data *rmd = data;
-       pte_t pte = pte_mkspecial(pfn_pte(rmd->mfn++, rmd->prot));
+       pte_t pte = pte_mkspecial(mfn_pte(rmd->mfn++, rmd->prot));
 
        rmd->mmu_update->ptr = virt_to_machine(ptep).maddr;
        rmd->mmu_update->val = pte_val_ma(pte);
@@ -2548,8 +2548,6 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
        if (xen_feature(XENFEAT_auto_translated_physmap))
                return -EINVAL;
 
-       prot = __pgprot(pgprot_val(prot) | _PAGE_IOMAP);
-
        BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
 
        rmd.mfn = mfn;
-- 
1.7.2.5


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