Messages in this thread Patch in this message | | | Date | Wed, 09 Jan 2008 09:17:13 +0000 | From | "Jan Beulich" <> | Subject | Re: [PATCH 10 of 10] xen: mask out PWT too |
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That's somewhat ugly, as it will need to be undone/modified for Dom0 and physical device access support. Jan
>>> Jeremy Fitzhardinge <jeremy@goop.org> 08.01.08 23:00 >>> The hypervisor doesn't allow PCD or PWT to be set on guest ptes, so make sure they're masked out. Also, fix up some previous mispatching.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
--- arch/x86/xen/mmu.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -244,7 +244,7 @@ pte_t xen_make_pte(unsigned long long pt if (pte & 1) pte = phys_to_machine(XPADDR(pte)).maddr; - pte &= ~_PAGE_PCD; + pte &= ~(_PAGE_PCD | _PAGE_PWT); return (pte_t){ .pte = pte }; } @@ -293,9 +293,7 @@ pte_t xen_make_pte(unsigned long pte) if (pte & _PAGE_PRESENT) pte = phys_to_machine(XPADDR(pte)).maddr; - pte &= ~_PAGE_PCD; - - pte &= ~_PAGE_PCD; + pte &= ~(_PAGE_PCD | _PAGE_PWT); return (pte_t){ pte }; }
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