linux-kernel - RE: [PATCH 1/3] Drivers: hv: balloon: don't crash when memory is added in non-sorted order

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Message-ID: <BL2PR03MB19081099009878C7AC29EAF8A0670@BL2PR03MB1908.namprd03.prod.outlook.com>
Date:	Sat, 30 Apr 2016 21:38:46 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	"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>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH 1/3] Drivers: hv: balloon: don't crash when memory is
 added in non-sorted order



> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Saturday, April 30, 2016 2:03 PM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> jasowang@...hat.com
> Subject: Re: [PATCH 1/3] Drivers: hv: balloon: don't crash when memory is
> added in non-sorted order
> 
> On Fri, Apr 29, 2016 at 11:45:17AM -0700, K. Y. Srinivasan wrote:
> > From: Vitaly Kuznetsov <vkuznets@...hat.com>
> >
> > When we iterate through all HA regions in handle_pg_range() we have an
> > assumption that all these regions are sorted in the list and the
> > 'start_pfn >= has->end_pfn' check is enough to find the proper region.
> > Unfortunately it's not the case with WS2016 where host can hot-add
> regions
> > in a different order. We end up modifying the wrong HA region and
> crashing
> > later on pages online. Modify the check to make sure we found the region
> > we were searching for while iterating. Fix the same check in pfn_covered()
> > as well.
> >
> > Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > ---
> >  drivers/hv/hv_balloon.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> I only received patch 1/3 here, what happened to the other 2?
> 
> Can you resend the whole series?

Will do.

Thanks,

K. Y
> 
> thanks,
> 
> greg k-h