On Fri, Jan 13, 2017 at 06:37:06PM +0000, Andrew Cooper wrote: > On 13/01/17 18:32, Marek Marczykowski-Górecki wrote: > > On Fri, Jan 13, 2017 at 06:15:35PM +0000, Andrew Cooper wrote: > >> Can you get the result of this piece of debugging in the failure case? > > I've got this: > > ** d4v0 CFG(24, 00007f794bd07004, 1) = 24 > > Silly question (and I really hope the answer isn't yes, but I have a > sinking feeling it is). > > Is the guest in question using SMAP? If so, does disabling SMAP fix the > problem?
How can I check that? If looking at 0x200000 CR4 bit in `xl debug-keys v` output enough, then yes - it's enabled. And booting hypervisor with smap=0 "fixed" the problem. So, what would be the correct solution? I'd prefer not to disable SMAP "just" for this reason... -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing?
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