KVM: MMU: Discard reserved bits checking on PDE bit 7-8

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1. It's related to a Linux kernel bug which fixed by Ingo on
07a66d7c53. The original code exists for quite a
long time, and it would convert a PDE for large page into a normal PDE. But it
fail to fit normal PDE well.  With the code before Ingo's fix, the kernel would
fall reserved bit checking with bit 8 - the remaining global bit of PTE. So the
kernel would receive a double-fault.

2. After discussion, we decide to discard PDE bit 7-8 reserved checking for now.
For this marked as reserved in SDM, but didn't checked by the processor in
fact...

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

...

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Sheng Yang 2009-04-02 10:28:37 +08:00 • committed by Avi Kivity

parent 64a7ec0668

commit 4c26b4cd6f

1 changed files with 4 additions and 3 deletions

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arch/x86/kvm/mmu.c

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