From: Ahmed S. Darwish <darwish.07@gmail.com>
Date: Sat, 9 Feb 2008 22:24:09 +0000 (+0100)
Subject: lguest: accept guest _PAGE_PWT page table entries
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=31f4b46ec6f889533c06537dea96bb0d20fa625b;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

lguest: accept guest _PAGE_PWT page table entries

Beginning from commit 4138cc3418f5, 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>
---

diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c
index 74b4cf2a6c41..275f23c2deb4 100644
--- a/drivers/lguest/page_tables.c
+++ b/drivers/lguest/page_tables.c
@@ -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");
 }