On 08/02/2011 02:07 PM, Xiao Guangrong wrote:
The idea is from Avi: | tag instructions that are typically used to modify the page tables, and drop | shadow if any other instruction is used | The list would include, I'd guess, and, or, bts, btc, mov, xchg, cmpxchg, and | cmpxchg8b This patch is used to tag the instructions and in the later path, shadow page is dropped if it is written by other instructions
We already have a mechanism for this, the decode tables. Why not add a new flag, PageTable, and set it on all relevant instructions?
Note we don't need to actually emulate, just decode, since page_fault can tell us whether a write failed due to page tables or mmio.
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