Paolo Bonzini ba6a354154 KVM: mmu: allow page tables to be in read-only slots ...

Page tables in a read-only memory slot will currently cause a triple
fault because the page walker uses gfn_to_hva and it fails on such a slot.

OVMF uses such a page table; however, real hardware seems to be fine with
that as long as the accessed/dirty bits are set.  Save whether the slot
is readonly, and later check it when updating the accessed and dirty bits.

Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2013-09-17 12:52:31 +03:00

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kvm

KVM: mmu: allow page tables to be in read-only slots

2013-09-17 12:52:31 +03:00