memoryvirtualization-vmware-e6998-virtual(文件)
【正文】 LB – Guest TLB invalidations caught by monitor, emulated ? Performance – Guest context switches flush entire software TLB Shadow Page Tables Guest Page Table Shadow Page Table Guest Page Table Guest Page Table Shadow Page Table Shadow Page Table Virtual CR3 Real CR3 Guest Write to CR3 Guest Page Table Shadow Page Table Guest Page Table Guest Page Table Shadow Page Table Shadow Page Table Virtual CR3 Real CR3 Guest Write to CR3 Guest Page Table Shadow Page Table Guest Page Table Guest Page Table Shadow Page Table Shadow Page Table Virtual CR3 Real CR3 Undiscovered Guest Page Table Guest Page Table Shadow Page Table Guest Page Table Guest Page Table Shadow Page Table Shadow Page Table Virtual CR3 Real CR3 Guest Page Table Undiscovered Guest Page Table Guest Page Table Shadow Page Table Guest Page Table Guest Page Table Shadow Page Table Shadow Page Table Virtual CR3 Real CR3 Guest Page Table Shadow Page Table Issues with Shadow Page Tables ? Positives – Handle page faults in same way as Emulated TLBs – Fast guest context switching ? Page Table Consistency – Guest may not need invalidate TLB on writes to offline page tables – Need to trace writes to shadow page tables to invalidate entries ? Memory Bloat – Caching guest page tables takes memory – Need to determine when guest has reused page tables Memory Tracing ? Call a monitor handler on access to a traced page – Before
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