Re: kern/55406 (NVMM panic on qemu start on intel)

[nia <nia%NetBSD.org@localhost>]

The following reply was made to PR kern/55406; it has been noted by GNATS.

From: nia <nia%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
	netbsd-bugs%netbsd.org@localhost, nia%pkgsrc.org@localhost
Subject: Re: kern/55406 (NVMM panic on qemu start on intel)
Date: Wed, 24 Jun 2020 19:08:02 +0000

 On Tue, Jun 23, 2020 at 05:15:02PM +0000, Maxime Villard wrote:
 >  Le 23/06/2020 à 19:07, nia a écrit :
 >  > On Tue, Jun 23, 2020 at 04:11:00PM +0000, maxv%NetBSD.org@localhost wrote:
 >  >> Did you suspend your host before launching the VM?
 >  > 
 >  > Probably, the host rarely gets powered off but does get suspended
 >  > every night.
 >  
 >  Well, that's where the problem comes from. I didn't put a sleep handler for
 >  NVMM, so when the CPU wakes up it can go crazy.
 >  
 >  In fact, it can go crazy for many other reasons, because many x86 states
 >  are not restored properly at wake-up time.
 >  
 >  For now I wouldn't recommend using sleep states at all.
 
 Can NVMM refuse to run on a system that has been resumed until this is fixed?
 This would at least help avoid accidental unclean shutdowns.