KVM: MMU: only write protect mappings at pagetable level

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If a pagetable contains a writeable large spte, all of its sptes will be
write protected, including non-leaf ones, leading to endless pagefaults.

Do not write protect pages above PT_PAGE_TABLE_LEVEL, as the spte fault
paths assume non-leaf sptes are writable.

Tested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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Marcelo Tosatti 2010-12-22 09:01:57 -02:00 • committed by Avi Kivity

parent 16d8f72f70

commit e49146dce8

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arch/x86/kvm/mmu.c

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