[Xen-devel] How does Xen emulate guest's write to its pte ?

[Xinxin Jin <xinxinjin89@xxxxxxxxx>]

Hi all,

I traced Xen's writable page table handler: PV guests' write operation to a pte will trap to Xen's page fault handler ptwr_do_page_fault() which will call x86_emulate() to emulate the write. 

But  after I print out the pte (which maps faulting virtual address) value,  I was very surprised to find that, the value does not change before/after x86_emulation(). This result confuses me: so how does Xen emulate pte write then ?

Thanks a lot !

-- 
Xinxin

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