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Commit 31f4b46e authored by Ahmed S. Darwish's avatar Ahmed S. Darwish Committed by Thomas Gleixner
Browse files

lguest: accept guest _PAGE_PWT page table entries 



Beginning from commit 4138cc34, 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: default avatarAhmed S. Darwish <darwish.07@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 261f0ce5

drivers/lguest/page_tables.c

+2 −2
Original line number Diff line number Diff line
@@ -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");

}