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xen-devel
Re: [Xen-devel] page fault handling in Xen
On 5/3/07 06:29, "jeet" <jeet_sat12@xxxxxxxxxxx> wrote:
> Above code will execute and in inner unlikely condition will be true as PT
> table is read only and error is write_access
> and control will go to not_a_shadow_fault?
>
> so when the emulation code would be executed for the write that has been
> performed on read only guest PT for adding entry in
> guest page table by guest?
>
> Have I missed some thing here in understanding
Yes: guest PTs are mapped with write permissions in the guest PTs. It's only
in the shadow PTs that the guest PTs are mapped read-only. The test on
accumulated_gflags is looking at the access permissions in the guest PTs.
-- Keir
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