From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Egger, Christoph" <chegger@amazon.de>
Subject: Re: [PATCH 1/2] gnttab: Introduce rwlock to protect
 updates to grant table state
Date: Tue, 2 Dec 2014 14:03:15 +0100
Message-ID: <547DB893.9020605@amazon.de>
References: <1417514784-15749-1-git-send-email-chegger@amazon.de>
	<1417514784-15749-2-git-send-email-chegger@amazon.de>
	<547DB21A.3090009@linaro.org>
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To: Julien Grall <julien.grall@linaro.org>, xen-devel@lists.xen.org
Cc: Keir Fraser <keir@xen.org>, Matt Wilson <msw@amazon.com>, Jan Beulich <jbeulich@suse.com>
List-Id: xen-devel@lists.xenproject.org

On 2014/12/02 13:35, Julien Grall wrote:
> Hi Christoph,
> 
> On 02/12/14 10:06, Christoph Egger wrote:
>> diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
>> index 522c43d..37c13b1 100644
>> --- a/xen/arch/x86/mm.c
>> +++ b/xen/arch/x86/mm.c
>> @@ -4565,7 +4565,7 @@ int xenmem_add_to_physmap_one(
>>                  mfn = virt_to_mfn(d->shared_info);
>>              break;
>>          case XENMAPSPACE_grant_table:
>> -            spin_lock(&d->grant_table->lock);
>> +            write_lock(&d->grant_table->lock);
>>  
>>              if ( d->grant_table->gt_version == 0 )
>>                  d->grant_table->gt_version = 1;
>> @@ -4587,7 +4587,7 @@ int xenmem_add_to_physmap_one(
>>                      mfn = virt_to_mfn(d->grant_table->shared_raw[idx]);
>>              }
>>  
>> -            spin_unlock(&d->grant_table->lock);
>> +            write_unlock(&d->grant_table->lock);
>>              break;
>>          case XENMAPSPACE_gmfn_range:
>>          case XENMAPSPACE_gmfn:
> 
> You forgot to modify the ARM bits which is using the spinlock. See
> arch/arm/mm.c

I can do the change. But I don't have ARM hardware nor the build
infrastructure. I need your help with compiling and testing on/for ARM.
Alternatively you can send me a patch I can add to or squash into my
patch series.

Christoph