On 17.05.2009, at 22:58, Avi Kivity wrote:
Alexander Graf wrote:
I can't think why it was done for writes. Normally, a guest page
fault would be trapped and reflected a long time before emulation,
in FNAME(page_fault)(), after walk_addr().
Can you give some details on the situation? What instruction was
executed, and why kvm tried to emulate it?
I remember it was something about accessing the apic with npt.
Maybe the real problem was the restricted bit checking that made
the emulated instruction behave differently from the real mmu.
The apic should not be mapped by Hyper-V's shadow page tables, so
this should have been handled by page_fault().
I think I only had to include this to find out that the restricted bit
was checked for, so I got a blue screen in the guest :-).
Hyper-V works fine without this patch on NPT.
Alex
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