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xen: don't drop NX bit 

Because NX is now enforced properly, we must put the hypercall page
into the .text segment so that it is executable.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stable Kernel <stable@kernel.org>
Cc: the arch/x86 maintainers <x86@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-06-16 15:01:56 -07:00 committed by Ingo Molnar
parent eb179e443d
commit a987b16cc6
2 changed files with 32 additions and 26 deletions
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56
arch/x86/xen/mmu.c
View File

@ -323,46 +323,54 @@ void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
preempt_enable();
}
/* Assume pteval_t is equivalent to all the other *val_t types. */
static pteval_t pte_mfn_to_pfn(pteval_t val)
{
if (val & _PAGE_PRESENT) {
unsigned long mfn = (val & PTE_MASK) >> PAGE_SHIFT;
pteval_t flags = val & ~PTE_MASK;
val = (mfn_to_pfn(mfn) << PAGE_SHIFT) | flags;
}
return val;
}
static pteval_t pte_pfn_to_mfn(pteval_t val)
{
if (val & _PAGE_PRESENT) {
unsigned long pfn = (val & PTE_MASK) >> PAGE_SHIFT;
pteval_t flags = val & ~PTE_MASK;
val = (pfn_to_mfn(pfn) << PAGE_SHIFT) | flags;
}
return val;
}
pteval_t xen_pte_val(pte_t pte)
{
pteval_t ret = pte.pte;
if (ret & _PAGE_PRESENT)
ret = machine_to_phys(XMADDR(ret)).paddr | _PAGE_PRESENT;
return ret;
return pte_mfn_to_pfn(pte.pte);
}
pgdval_t xen_pgd_val(pgd_t pgd)
{
pgdval_t ret = pgd.pgd;
if (ret & _PAGE_PRESENT)
ret = machine_to_phys(XMADDR(ret)).paddr | _PAGE_PRESENT;
return ret;
return pte_mfn_to_pfn(pgd.pgd);
}
pte_t xen_make_pte(pteval_t pte)
{
if (pte & _PAGE_PRESENT)
pte = phys_to_machine(XPADDR(pte)).maddr;
return (pte_t){ .pte = pte };
pte = pte_pfn_to_mfn(pte);
return native_make_pte(pte);
}
pgd_t xen_make_pgd(pgdval_t pgd)
{
if (pgd & _PAGE_PRESENT)
pgd = phys_to_machine(XPADDR(pgd)).maddr;
return (pgd_t){ pgd };
pgd = pte_pfn_to_mfn(pgd);
return native_make_pgd(pgd);
}
pmdval_t xen_pmd_val(pmd_t pmd)
{
pmdval_t ret = native_pmd_val(pmd);
if (ret & _PAGE_PRESENT)
ret = machine_to_phys(XMADDR(ret)).paddr | _PAGE_PRESENT;
return ret;
return pte_mfn_to_pfn(pmd.pmd);
}
void xen_set_pud_hyper(pud_t *ptr, pud_t val)
@ -421,9 +429,7 @@ void xen_pmd_clear(pmd_t *pmdp)
pmd_t xen_make_pmd(pmdval_t pmd)
{
if (pmd & _PAGE_PRESENT)
pmd = phys_to_machine(XPADDR(pmd)).maddr;
pmd = pte_pfn_to_mfn(pmd);
return native_make_pmd(pmd);
}

2
arch/x86/xen/xen-head.S
View File

@ -18,7 +18,7 @@ ENTRY(startup_xen)
__FINIT
.pushsection .bss.page_aligned
.pushsection .text
.align PAGE_SIZE_asm
ENTRY(hypercall_page)
.skip 0x1000