KVM: MMU: Decouple mmio from shadow page tables

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Currently an mmio guest pte is encoded in the shadow pagetable as a
not-present trapping pte, with the SHADOW_IO_MARK bit set.  However
nothing is ever done with this information, so maintaining it is a
useless complication.

This patch moves the check for mmio to before shadow ptes are instantiated,
so the shadow code is never invoked for ptes that reference mmio.  The code
is simpler, and with future work, can be made to handle mmio concurrently.

Signed-off-by: Avi Kivity <avi@qumranet.com>

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This commit is contained in:

Avi Kivity 2008-01-24 11:44:11 +02:00

parent 1d6ad2073e

commit d196e34336

2 changed files with 23 additions and 28 deletions

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34

arch/x86/kvm/mmu.c

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17

arch/x86/kvm/paging_tmpl.h

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