KVM: MMU: ignore zapped root pagetables

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Mark zapped root pagetables as invalid and ignore such pages during lookup.

This is a problem with the cr3-target feature, where a zapped root table fools
the faulting code into creating a read-only mapping. The result is a lockup
if the instruction can't be emulated.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

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Marcelo Tosatti 2008-02-20 14:47:24 -05:00 • committed by Avi Kivity

parent 847f0ad8cb

commit 2e53d63acb

5 changed files with 48 additions and 2 deletions

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include/linux/kvm_host.h

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