https://bugzilla.kernel.org/show_bug.cgi?id=59521 --- Comment #4 from Eugene Batalov <eabatalov89@xxxxxxxxx> 2013-06-17 21:29:08 --- (In reply to comment #3) > Reply-To: pbonzini@xxxxxxxxxx > > Il 15/06/2013 19:17, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx ha scritto: > > The problem is in cpu_init() which is called earlier. > > cpu_init() calls printk and possibly other stuff which can use timestamps. > > printk calls local_clock() to obtain a timestamp of a log message. On KVM > > guests call sequence usually ends up in kvm_clock_read but needed rdmsr is > > executed only in x86_cpuinit.early_percpu_clock_init(). > > > > I consider two approaches to fix the problem: > > 1. Swap cpu_init(); and x86_cpuinit.early_percpu_clock_init(); > > + Simple > > - We will get excessive restrictions on operations which allowed to be > > performed in early_percpu_clock_init() because percpu specific data is > > initialized only in cpu_init(). > > Considering how simple kvm_register_clock is, I think this is > preferrable if it works. Ironically, commit 7069ed6 (x86: kvmclock: > allocate pvclock shared memory area, 2012-11-27), which introduced the > regression, is what should make this simpler fix possible. > > Paolo Understood your point. I'll test this fix and report the results. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- 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
