On 02/16/2012 06:23 PM, Alexander Graf wrote: > On 16.02.2012, at 21:41, Scott Wood wrote: >> And yes, we do have fancier hardware coming fairly soon for which this >> breaks (TLB0 entries can be loaded without host involvement, as long as >> there's a translation from guest physical to physical in a separate >> hardware table). It'd be reasonable to ignore TLB0 for migration (treat >> it as invalidated), but not for debug since that may be where the >> translation we're interested in resides. > > Could we maybe add an ioctl that forces kvm to read out the current tlb0 contents and push them to memory? How slow would that be? Yes, I was thinking something like that. We'd just have to remove (make conditional on MMU type) the statement that this is synchronized implicitly on return from vcpu_run. Performance shouldn't be a problem -- we'd only need to sync once and then can do all the repeated debug accesses we want. So should be no need to mess around with partial sync. -Scott -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
