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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-06-16 15:01:53 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-20 14:55:11 +0200 |
| commit | eb179e443deb0a5c81a62b4c157124a4b7ff1813 (patch) | |
| tree | 352f02e0c9802b1025a7bf165e97aee88979387d | |
| parent | 6673cf63e5d973db5145d1f48b354efcb9fe2a13 (diff) | |
| download | linux-eb179e443deb0a5c81a62b4c157124a4b7ff1813.tar.gz linux-eb179e443deb0a5c81a62b4c157124a4b7ff1813.tar.bz2 linux-eb179e443deb0a5c81a62b4c157124a4b7ff1813.zip | |
xen: mask unwanted pte bits in __supported_pte_mask
[ Stable: this isn't a bugfix in itself, but it's a pre-requiste
for "xen: don't drop NX bit" ]
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>
| -rw-r--r-- | arch/x86/xen/enlighten.c | 5 | ||||
| -rw-r--r-- | arch/x86/xen/mmu.c | 4 |
2 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 8e6152e6ed88..73fb0c4c150a 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1280,6 +1280,11 @@ asmlinkage void __init xen_start_kernel(void) if (xen_feature(XENFEAT_supervisor_mode_kernel)) pv_info.kernel_rpl = 0; + /* Prevent unwanted bits from being set in PTEs. */ + __supported_pte_mask &= ~_PAGE_GLOBAL; + if (!is_initial_xendomain()) + __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); + /* set the limit of our address space */ xen_reserve_top(); diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 7c9935858f92..f0078d9a5b78 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -343,10 +343,8 @@ pgdval_t xen_pgd_val(pgd_t pgd) pte_t xen_make_pte(pteval_t pte) { - if (pte & _PAGE_PRESENT) { + if (pte & _PAGE_PRESENT) pte = phys_to_machine(XPADDR(pte)).maddr; - pte &= ~(_PAGE_PCD | _PAGE_PWT); - } return (pte_t){ .pte = pte }; } |