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lguest: accept guest _PAGE_PWT page table entries 

Beginning from commit 4138cc3418, ioremap_nocache() sets the _PAGE_PWT
flag.

Lguest doesn't accept a guest pte with a _PWT flag and reports a "bad
page table entry" in that case.

Accept guest _PAGE_PWT page table entries.

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ahmed S. Darwish 2008-02-09 23:24:09 +01:00 committed by Thomas Gleixner
parent 261f0ce5cc
commit 31f4b46ec6
1 changed files with 2 additions and 2 deletions
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4
drivers/lguest/page_tables.c
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@ -178,8 +178,8 @@ static void release_pte(pte_t pte)
static void check_gpte(struct lg_cpu *cpu, pte_t gpte)
{
if ((pte_flags(gpte) & (_PAGE_PWT|_PAGE_PSE))
|| pte_pfn(gpte) >= cpu->lg->pfn_limit)
if ((pte_flags(gpte) & _PAGE_PSE) ||
pte_pfn(gpte) >= cpu->lg->pfn_limit)
kill_guest(cpu, "bad page table entry");
}