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Re: [Xen-devel] [PATCH] iommu/quirk: disable shared EPT for Sandybridge and earlier processors.

To: Jan Beulich <JBeulich@xxxxxxxx>, <"Anshul Makkar anshul.makkar"@citrix.com>
From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date: Tue, 1 Sep 2015 15:18:21 +0100
Cc: yang.z.zhang@xxxxxxxxx, anshulma <anshul.makkar@xxxxxxxxxx>, kevin.tian@xxxxxxxxx, xen-devel@xxxxxxxxxxxxx
Delivery-date: Tue, 01 Sep 2015 14:21:13 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 31/08/15 09:09, Jan Beulich wrote:
>>>> On 28.08.15 at 17:41, <Anshul Makkar anshul.makkar@xxxxxxxxxx> wrote:
>> --- a/docs/misc/xen-command-line.markdown
>> +++ b/docs/misc/xen-command-line.markdown
>> @@ -896,7 +896,7 @@ debug hypervisor only).
>>  
>>  > `sharept`
>>  
>> -> Default: `true`
>> +> Default: `true` if newer than SandyBridge or `false` if Sandybridge or 
>> earlier.
> This neglects the AMD side.

The AMD side has iommu_hap_pt_share unconditionally disabled, for
reasons pertaining to grant mapped frames.

~Andrew

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