Re: [PATCH] powerpc/64s: Clear PCR on boot

2018-05-28 Thread Benjamin Herrenschmidt
On Sat, 2018-05-26 at 20:45 -0700, Guenter Roeck wrote: > > I already have a patch, or at least one that does the trick for me. > Getting qemu patched was not the problem. I just want to be sure that > the problem is indeed a qemu problem. Hey Guenter ! It's not quite the right patch though. The

Re: [PATCH] powerpc/64s: Clear PCR on boot

2018-05-26 Thread Guenter Roeck
Hi Michael, On Sun, May 27, 2018 at 12:22:23PM +1000, Michael Ellerman wrote: > > > On 25 May 2018 11:33:08 pm AEST, Guenter Roeck wrote: > >On Fri, May 18, 2018 at 11:37:42AM +1000, Michael Neuling wrote: > >> Clear the PCR (Processor Compatibility Register) on boot to ensure we > >> are not r

Re: [PATCH] powerpc/64s: Clear PCR on boot

2018-05-26 Thread Michael Ellerman
On 25 May 2018 11:33:08 pm AEST, Guenter Roeck wrote: >On Fri, May 18, 2018 at 11:37:42AM +1000, Michael Neuling wrote: >> Clear the PCR (Processor Compatibility Register) on boot to ensure we >> are not running in a compatibility mode. >> >> We've seen this cause problems when a crash (and kdu

Re: [PATCH] powerpc/64s: Clear PCR on boot

2018-05-25 Thread Guenter Roeck
On Fri, May 18, 2018 at 11:37:42AM +1000, Michael Neuling wrote: > Clear the PCR (Processor Compatibility Register) on boot to ensure we > are not running in a compatibility mode. > > We've seen this cause problems when a crash (and kdump) occurs while > running compat mode guests. The kdump kerne