On Fri, 2011-11-18 at 09:03 -0700, Alex Williamson wrote: > I can't help but thinking we're just taking the easy, lazy path for VM > domains when it sounds like we really would prefer to keep the coherency > set to the least common denominator of the domain rather than the > platform. Couldn't we instead force a flush of the domain when we > transition from coherent to non-coherent? Not sure I'm qualified to > write that, but seems like it would keep the efficiency of VM domains > with no effect to native DMA domains since they'd never trigger such a > transition. The below appears as if it would work and probably be OK > since the unnecessary cache flushes are rare, but they're still > unnecessary... and the comments/commit log are now wrong. Thanks, Yeah, that would make some sense. I was about to knock up some code which would walk the page tables and use clflush to flush every one... but wouldn't it be saner just to use wbinvd? -- dwmw2
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