Write bit in Shadow Page Table Entry

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Hi,
As I understand, the KVM code (kvm-86) may clear the write bit when
setting a shadow page table entry so that it can detect when an entry
needs to be marked dirty later. However, it also plays with the write
bit depending on whether the shadow page is allowed to be unsynched or
not. I'm not quite clear on the latter, so if anyone can provide some
insights it would be very much appreciated. Or perhaps even more
helpful...if it is possible to provide a clear picture of how KVM
generally plays with an entry's write bit.

Thank you!,
-Lynda Yang
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