linux-kernel - [PATCH 0/2] Drivers: hv: balloon: two memory hotplug fixes

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Message-Id: <1459876874-882-1-git-send-email-vkuznets@redhat.com>
Date:	Tue,  5 Apr 2016 19:21:12 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	devel@...uxdriverproject.org
Cc:	linux-kernel@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Alex Ng <alexng@...rosoft.com>, Cathy Avery <cavery@...hat.com>
Subject: [PATCH 0/2] Drivers: hv: balloon: two memory hotplug fixes

Hi,

I found an issue (crash) while testing memory hotplug on WS2016TP4 host.
It should be easily reproducible with the following test sequence
 (4.6-rc2):

1) Start a VM with 4 vCPUs in 4 NUMA nodes, 4096Mb of RAM.
2) Enable memory auto onlining with 
   'echo online > /sys/devices/system/memory/auto_online_blocks'
3) Wait till hv_balloon driver finishes negotiation.
4) Increase memory to 8192Mb.
5) Increase memory to 10000Mb.

The first patch in the series fixes the issue. While writing it I stumbled
upon an unrelated issue which I fix with PATCH 2.

Please review.

Vitaly Kuznetsov (2):
  Drivers: hv: balloon: don't crash when memory is added in non-sorted
    order
  Drivers: hv: balloon: reset host_specified_ha_region

 drivers/hv/hv_balloon.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

-- 
2.5.5