linux-kernel - RE: [PATCH RESEND 1/8] Drivers: hv: vmbus: prevent cpu offlining on newer hypervisors

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Message-ID: <BY2PR0301MB071150CF1FC27F35ABC75702A0330@BY2PR0301MB0711.namprd03.prod.outlook.com>
Date:	Wed, 28 Jan 2015 22:16:56 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	KY Srinivasan <kys@...rosoft.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: RE: [PATCH RESEND 1/8] Drivers: hv: vmbus: prevent cpu offlining on
 newer hypervisors



> -----Original Message-----
> From: K. Y. Srinivasan [mailto:kys@...rosoft.com]
> Sent: Tuesday, January 27, 2015 3:47 PM
> To: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> vkuznets@...hat.com; tglx@...utronix.de
> Cc: KY Srinivasan
> Subject: [PATCH RESEND 1/8] Drivers: hv: vmbus: prevent cpu offlining on
> newer hypervisors
> 
> From: Vitaly Kuznetsov <vkuznets@...hat.com>
> 
> When an SMP Hyper-V guest is running on top of 2012R2 Server and
> secondary cpus are sent offline (with echo 0 >
> /sys/devices/system/cpu/cpu$cpu/online)
> the system freeze is observed. This happens due to the fact that on newer
> hypervisors (Win8, WS2012R2, ...) vmbus channel handlers are distributed
> across all cpus (see init_vp_index() function in drivers/hv/channel_mgmt.c)
> and on cpu offlining nobody reassigns them to CPU0. Prevent cpu offlining
> when vmbus is loaded until the issue is fixed host-side.
> 
> This patch also disables hibernation but it is OK as it is also broken (MCE error
> is hit on resume). Suspend still works.
> 
> Tested with WS2008R2 and WS2012R2.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>

Greg,

Please drop this entire series; the patch-set was based on the incorrect tree. I will resend the set shortly
after rebasing them on your  char-misc.git.

Thank you,

K. Y
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