From: Avi Kivity <avi@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, mingo@elte.hu,
a.p.zijlstra@chello.nl, tglx@linutronix.de, hpa@zytor.com,
riel@redhat.com, cl@linux-foundation.org, mtosatti@redhat.com
Subject: Re: [PATCH v6 08/12] Handle async PF in a guest.
Date: Sat, 09 Oct 2010 20:48:15 +0200 [thread overview]
Message-ID: <4CB0B8EF.3050702@redhat.com> (raw)
In-Reply-To: <20101007180340.GI2397@redhat.com>
On 10/07/2010 08:03 PM, Gleb Natapov wrote:
> > >>
> > >Host side keeps track of outstanding apfs and will not send apf for the
> > >same phys address twice. It will halt vcpu instead.
> >
> > What about different pages, running the scheduler code?
> >
> We can get couple of nested apfs, just like we can get nested
> interrupts. Since scheduler disables preemption second apf will halt.
How much is a couple?
Consider:
SIGSTOP
Entire process swapped out
SIGCONT
We can get APF's on the current code, the scheduler code, the stack, any
debugging code in between (e.g. ftrace), and the page tables for all of
these.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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next prev parent reply other threads:[~2010-10-09 18:48 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-04 15:56 [PATCH v6 00/12] KVM: Add host swap event notifications for PV guest Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 01/12] Add get_user_pages() variant that fails if major fault is required Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 02/12] Halt vcpu if page it tries to access is swapped out Gleb Natapov
2010-10-05 1:20 ` Rik van Riel
2010-10-05 14:59 ` Marcelo Tosatti
2010-10-06 10:50 ` Avi Kivity
2010-10-06 10:52 ` Gleb Natapov
2010-10-07 9:54 ` Avi Kivity
2010-10-07 17:48 ` Gleb Natapov
2010-10-06 11:15 ` Gleb Natapov
2010-10-07 9:50 ` Avi Kivity
2010-10-07 9:52 ` Avi Kivity
2010-10-07 13:24 ` Rik van Riel
2010-10-07 13:29 ` Avi Kivity
2010-10-07 17:47 ` Gleb Natapov
2010-10-09 18:30 ` Avi Kivity
2010-10-09 18:32 ` Avi Kivity
2010-10-10 7:30 ` Gleb Natapov
2010-10-10 7:29 ` Gleb Natapov
2010-10-10 15:55 ` Avi Kivity
2010-10-10 15:56 ` Avi Kivity
2010-10-10 16:17 ` Gleb Natapov
2010-10-10 16:16 ` Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 03/12] Retry fault before vmentry Gleb Natapov
2010-10-05 15:54 ` Marcelo Tosatti
2010-10-06 11:07 ` Gleb Natapov
2010-10-06 14:20 ` Marcelo Tosatti
2010-10-07 18:44 ` Gleb Natapov
2010-10-08 16:07 ` Marcelo Tosatti
2010-10-07 12:29 ` Avi Kivity
2010-10-07 17:21 ` Gleb Natapov
2010-10-09 18:42 ` Avi Kivity
2010-10-10 7:35 ` Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 04/12] Add memory slot versioning and use it to provide fast guest write interface Gleb Natapov
2010-10-05 1:29 ` Rik van Riel
2010-10-05 16:57 ` Marcelo Tosatti
2010-10-06 11:14 ` Gleb Natapov
2010-10-06 14:38 ` Marcelo Tosatti
2010-10-06 20:08 ` Gleb Natapov
2010-10-07 10:00 ` Avi Kivity
2010-10-07 15:42 ` Marcelo Tosatti
2010-10-07 16:03 ` Gleb Natapov
2010-10-07 16:20 ` Avi Kivity
2010-10-07 17:23 ` Gleb Natapov
2010-10-10 12:48 ` Avi Kivity
2010-10-07 12:31 ` Avi Kivity
2010-10-04 15:56 ` [PATCH v6 05/12] Move kvm_smp_prepare_boot_cpu() from kvmclock.c to kvm.c Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 06/12] Add PV MSR to enable asynchronous page faults delivery Gleb Natapov
2010-10-07 12:42 ` Avi Kivity
2010-10-07 17:53 ` Gleb Natapov
2010-10-10 12:47 ` Avi Kivity
2010-10-10 13:27 ` Gleb Natapov
2010-10-07 12:58 ` Avi Kivity
2010-10-07 17:59 ` Gleb Natapov
2010-10-09 18:43 ` Avi Kivity
2010-10-04 15:56 ` [PATCH v6 07/12] Add async PF initialization to PV guest Gleb Natapov
2010-10-05 2:34 ` Rik van Riel
2010-10-05 18:25 ` Marcelo Tosatti
2010-10-06 10:55 ` Gleb Natapov
2010-10-06 14:45 ` Marcelo Tosatti
2010-10-06 20:05 ` Gleb Natapov
2010-10-07 12:50 ` Avi Kivity
2010-10-08 7:54 ` Gleb Natapov
2010-10-09 18:44 ` Avi Kivity
2010-10-04 15:56 ` [PATCH v6 08/12] Handle async PF in a guest Gleb Natapov
2010-10-07 13:10 ` Avi Kivity
2010-10-07 17:14 ` Gleb Natapov
2010-10-07 17:18 ` Avi Kivity
2010-10-07 17:48 ` Rik van Riel
2010-10-07 18:03 ` Gleb Natapov
2010-10-09 18:48 ` Avi Kivity [this message]
2010-10-10 7:56 ` Gleb Natapov
2010-10-10 12:40 ` Avi Kivity
2010-10-10 12:32 ` Gleb Natapov
2010-10-10 12:38 ` Avi Kivity
2010-10-10 13:22 ` Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 09/12] Inject asynchronous page fault into a PV guest if page is swapped out Gleb Natapov
2010-10-05 2:36 ` Rik van Riel
2010-10-05 19:00 ` Marcelo Tosatti
2010-10-06 10:42 ` Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 10/12] Handle async PF in non preemptable context Gleb Natapov
2010-10-05 19:51 ` Marcelo Tosatti
2010-10-06 10:41 ` Gleb Natapov
2010-10-10 14:25 ` Gleb Natapov
2010-10-04 15:56 ` [PATCH v6 11/12] Let host know whether the guest can handle async PF in non-userspace context Gleb Natapov
2010-10-07 13:36 ` Avi Kivity
2010-10-04 15:56 ` [PATCH v6 12/12] Send async PF when guest is not in userspace too Gleb Natapov
2010-10-05 2:37 ` Rik van Riel
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