Em Tue, Mar 01, 2016 at 03:49:53PM -0800, Andi Kleen escreveu: > On Tue, Mar 01, 2016 at 12:35:24PM -0300, Arnaldo Carvalho de Melo wrote: > > Em Mon, Feb 29, 2016 at 04:25:49PM -0300, Arnaldo Carvalho de Melo escreveu: > > > Em Mon, Feb 29, 2016 at 06:35:28PM +0100, Andi Kleen escreveu: > > > > > What kernel have you used for testing this? 4.5-rc? I'm having trouble > > > > > with intel_pt with 4.5.0-rc4 :-\
> > > > Works for me (on -rc5). What problem do you see? > > > Doesn't work for me on (4.5.0-rc4), but after your report of it working > > > my -rc4 .config and built -rc6+ with it, now it seems to work as > > > expected, will test your patch with it later. > > Humm, after suspend/resume it is back not working, using your example > > for this case: > PT is always disabled when VT-x is active. > I guess the problem is here that it doesn't get reenabled when context > switching > out of the guest. Need to add some code to KVM to do this (similar to how > PEBS is handled) > However it should work again when you stop the KVM guest and restart the > trace. Right, if there are no KVM guests running, Intel PT is back working, which is rather incovenient :-\ - Arnaldo
