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From: Thomas Gleixner <tglx@linutronix.de>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>,
	Joerg Roedel <jroedel@suse.de>,
	Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Peter Anvin <hpa@zytor.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	Borislav Petkov <bp@suse.de>, xiao jin <jin.xiao@intel.com>
Subject: Re: [patch 1/4] hotplug: Prevent alloc/free of irq descriptors during cpu up/down
Date: Tue, 14 Jul 2015 17:44:42 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1507141743150.18576__23294.7368095212$1436888809$gmane$org@nanos> (raw)
In-Reply-To: <55A51F10.7010407@oracle.com>

On Tue, 14 Jul 2015, Boris Ostrovsky wrote:
> > Prevent allocation and freeing of interrupt descriptors accross cpu
> > hotplug.
> This breaks Xen guests that allocate interrupt descriptors in .cpu_up().

And where exactly does XEN allocate those descriptors?
> Any chance this locking can be moved into arch code?


> (The patch doesn't appear to have any side effects for the down path since Xen
> guests deallocate descriptors in __cpu_die()).
Exact place please.



  parent reply	other threads:[~2015-07-14 15:45 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20150705170530.849428850@linutronix.de>
     [not found] ` <20150705171102.063519515@linutronix.de>
2015-07-14 14:39   ` [patch 1/4] hotplug: Prevent alloc/free of irq descriptors during cpu up/down Boris Ostrovsky
     [not found]   ` <55A51F10.7010407@oracle.com>
2015-07-14 15:44     ` Thomas Gleixner [this message]
     [not found]     ` <alpine.DEB.2.11.1507141743150.18576@nanos>
2015-07-14 16:03       ` Boris Ostrovsky
     [not found]       ` <55A532C2.4080306@oracle.com>
2015-07-14 17:32         ` Thomas Gleixner
     [not found]         ` <alpine.DEB.2.11.1507141901460.18576@nanos>
2015-07-14 20:04           ` Boris Ostrovsky
     [not found]           ` <55A56B48.4060605@oracle.com>
2015-07-14 20:15             ` Thomas Gleixner
     [not found]             ` <alpine.DEB.2.11.1507142211390.18576@nanos>
2015-07-14 21:07               ` Boris Ostrovsky
     [not found]               ` <55A579FD.6030000@oracle.com>
2016-03-12  9:19                 ` Thomas Gleixner
     [not found]                 ` <alpine.DEB.2.11.1603121017500.3657@nanos>
2016-03-14 13:12                   ` Boris Ostrovsky

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