From: Olaf Hering <olaf@aepfle.de>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: how to properly reset event channel in PVonHVM after kexec boot
Date: Wed, 14 Mar 2012 12:05:24 +0100 [thread overview]
Message-ID: <20120314110524.GA25099@aepfle.de> (raw)
In-Reply-To: <1331722619.23971.397.camel@zakaz.uk.xensource.com>
On Wed, Mar 14, Ian Campbell wrote:
> On Wed, 2012-03-14 at 10:52 +0000, Olaf Hering wrote:
> > What is the best way to reset all registered event channels after an
> > kexec boot in a PVonHVM guest? Right now repeated kexec boots will fail
> > after 1300 iterations because no more event channels can be registered.
> >
> > EVTCHNOP_reset can not be used because it expects the domid, which the guest
> > does not know.
>
> It appears that it accepts DOMID_SELF. It calls
> rcu_lock_target_domain_by_id which handles it explicitly.
Oh, I will see how it works then. It was not obvious to me that
DOMID_SELF is handled.
>From reading the code it appears that it could also reset
EVTCHNSTAT_interdomain, which would hang the guest. Thats why my patch
skips this state.
Olaf
next prev parent reply other threads:[~2012-03-14 11:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 10:52 how to properly reset event channel in PVonHVM after kexec boot Olaf Hering
2012-03-14 10:56 ` Ian Campbell
2012-03-14 11:05 ` Olaf Hering [this message]
2012-03-14 18:01 ` Olaf Hering
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