On Wed, Apr 4, 2012 at 2:30 PM, Gleb Natapov <gleb@xxxxxxxxxx> wrote: > On Tue, Apr 03, 2012 at 01:52:26PM +0300, Gleb Natapov wrote: >> On Mon, Apr 02, 2012 at 08:54:32PM -0400, Sasha Levin wrote: >> > Hi all, >> > >> > I got the spew at the bottom of the mail in a KVM guest using the KVM tools and running trinity. >> > >> > I'm not quite sure how default_idle managed to trigger a pagefault, so that part looks odd to me. >> > >> This is not regular page fault. This is async page fault that tells the >> guest that a page, previously swapped out by hypervisor, is now swapped >> back in and it can happen while vcpu is idle. The code does not leave >> idle state properly though. We probably need to call rcu_irq_enter() >> there. Will look into it. >> > > The patch below solves it for me: > > "Page ready" async PF can kick vcpu out of idle state much like IRQ. > We need to tell RCU about this. Looks good here. -- 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
