From: Manuel Bouyer <bouyer@antioche.eu.org>
To: Jan Beulich <jbeulich@suse.com>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>, xen-devel@lists.xenproject.org
Subject: Re: NetBSD dom0 PVH: hardware interrupts stalls
Date: Fri, 27 Nov 2020 14:31:21 +0100 [thread overview]
Message-ID: <20201127133121.GN1717@antioche.eu.org> (raw)
In-Reply-To: <714e9393-d7f4-ed47-d1ed-aff79f3552a0@suse.com>
On Fri, Nov 27, 2020 at 02:18:54PM +0100, Jan Beulich wrote:
> On 27.11.2020 14:13, Manuel Bouyer wrote:
> > On Fri, Nov 27, 2020 at 12:29:35PM +0100, Jan Beulich wrote:
> >> On 27.11.2020 11:59, Roger Pau Monné wrote:
> >>> --- a/xen/arch/x86/hvm/irq.c
> >>> +++ b/xen/arch/x86/hvm/irq.c
> >>> @@ -187,6 +187,10 @@ void hvm_gsi_assert(struct domain *d, unsigned int gsi)
> >>> * to know if the GSI is pending or not.
> >>> */
> >>> spin_lock(&d->arch.hvm.irq_lock);
> >>> + if ( gsi == TRACK_IRQ )
> >>> + debugtrace_printk("hvm_gsi_assert irq %u trig %u assert count %u\n",
> >>> + gsi, trig, hvm_irq->gsi_assert_count[gsi]);
> >>
> >> This produces
> >>
> >> 81961 hvm_gsi_assert irq 34 trig 1 assert count 1
> >>
> >> Since the logging occurs ahead of the call to assert_gsi(), it
> >> means we don't signal anything to Dom0, because according to our
> >> records there's still an IRQ in flight. Unfortunately we only
> >> see the tail of the trace, so it's not possible to tell how / when
> >> we got into this state.
> >>
> >> Manuel - is this the only patch you have in place? Or did you keep
> >> any prior ones? Iirc there once was one where Roger also suppressed
> >> some de-assert call.
> >
> > Yes, I have some of the previous patches (otherwise Xen panics).
> > Attached is the diffs I currently have
>
> I think you want to delete the hunk dropping the call to
> hvm_gsi_deassert() from pt_irq_time_out(). Iirc it was that
> addition which changed the behavior to just a single IRQ ever
> making it into Dom0. And it ought to be only the change to
> msix_write() which is needed to avoid the panic.
yes, I did keep the hvm_gsi_deassert() patch because I expected it
to make things easier, as it allows to interract with Xen without changing
interrupt states.
I removed it, here's a new trace
http://www-soc.lip6.fr/~bouyer/xen-log12.txt
--
Manuel Bouyer <bouyer@antioche.eu.org>
NetBSD: 26 ans d'experience feront toujours la difference
--
next prev parent reply other threads:[~2020-11-27 13:31 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 15:09 NetBSD dom0 PVH: hardware interrupts stalls Manuel Bouyer
2020-11-17 15:58 ` Roger Pau Monné
2020-11-17 16:40 ` Manuel Bouyer
2020-11-18 8:57 ` Roger Pau Monné
2020-11-18 9:24 ` Manuel Bouyer
2020-11-18 10:00 ` Roger Pau Monné
2020-11-18 12:14 ` Manuel Bouyer
2020-11-18 14:39 ` Roger Pau Monné
2020-11-18 14:59 ` Jan Beulich
2020-11-19 14:19 ` Roger Pau Monné
2020-11-19 15:57 ` Manuel Bouyer
2020-11-19 16:57 ` Manuel Bouyer
2020-11-19 17:57 ` Manuel Bouyer
2020-11-20 8:09 ` Jan Beulich
2020-11-20 8:28 ` Roger Pau Monné
2020-11-20 8:52 ` Manuel Bouyer
2020-11-20 8:59 ` Jan Beulich
2020-11-20 9:27 ` Manuel Bouyer
2020-11-20 10:00 ` Jan Beulich
2020-11-20 10:38 ` Manuel Bouyer
2020-11-23 9:57 ` Roger Pau Monné
2020-11-23 11:32 ` Manuel Bouyer
2020-11-23 12:51 ` Roger Pau Monné
2020-11-23 14:31 ` Manuel Bouyer
2020-11-23 17:06 ` Roger Pau Monné
2020-11-23 17:39 ` Manuel Bouyer
2020-11-24 10:05 ` Jan Beulich
2020-11-24 12:21 ` Roger Pau Monné
2020-11-24 13:59 ` Manuel Bouyer
2020-11-24 14:09 ` Jan Beulich
2020-11-24 14:27 ` Manuel Bouyer
2020-11-24 14:33 ` Jan Beulich
2020-11-24 14:36 ` Jan Beulich
2020-11-24 14:52 ` Jan Beulich
2020-11-24 15:00 ` Roger Pau Monné
2020-11-24 15:08 ` Manuel Bouyer
2020-11-24 15:49 ` Roger Pau Monné
2020-11-24 16:09 ` Manuel Bouyer
2020-11-26 13:34 ` Roger Pau Monné
2020-11-26 14:16 ` Manuel Bouyer
2020-11-26 14:26 ` Roger Pau Monné
2020-11-26 15:09 ` Roger Pau Monné
2020-11-26 17:20 ` Manuel Bouyer
2020-11-27 10:59 ` Roger Pau Monné
2020-11-27 11:18 ` Jan Beulich
2020-11-27 11:19 ` Manuel Bouyer
2020-11-27 11:21 ` Jan Beulich
2020-11-27 13:10 ` Manuel Bouyer
2020-11-27 13:14 ` Jan Beulich
2020-11-27 13:18 ` Manuel Bouyer
2020-11-27 11:29 ` Jan Beulich
2020-11-27 13:13 ` Manuel Bouyer
2020-11-27 13:18 ` Jan Beulich
2020-11-27 13:31 ` Manuel Bouyer [this message]
2020-11-27 13:40 ` Jan Beulich
2020-11-27 13:49 ` Jürgen Groß
2020-11-27 13:59 ` Manuel Bouyer
2020-11-27 20:22 ` Roger Pau Monné
2020-11-27 21:44 ` Manuel Bouyer
2020-11-28 14:53 ` Roger Pau Monné
2020-11-28 17:14 ` Manuel Bouyer
2020-11-29 9:23 ` Manuel Bouyer
2020-11-30 10:00 ` Jan Beulich
2020-11-30 10:28 ` Manuel Bouyer
2020-11-30 11:35 ` Manuel Bouyer
2020-11-30 11:44 ` Jan Beulich
2020-11-30 11:50 ` Manuel Bouyer
2020-11-30 12:09 ` Jan Beulich
2020-11-24 14:42 ` Jan Beulich
2020-11-24 14:59 ` Roger Pau Monné
2020-11-24 15:18 ` Manuel Bouyer
2020-11-24 15:23 ` Jürgen Groß
2020-11-20 8:54 ` Jan Beulich
2020-11-20 9:13 ` Manuel Bouyer
2020-11-23 9:49 ` Roger Pau Monné
2020-11-18 15:03 ` Manuel Bouyer
2020-11-18 9:16 ` Jan Beulich
2020-11-18 9:28 ` Manuel Bouyer
2020-11-18 9:43 ` Jan Beulich
2020-11-18 10:14 ` Manuel Bouyer
2020-11-18 11:17 ` Jan Beulich
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