From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH] iommu/quirk: disable shared EPT for
 Sandybridge and earlier processors.
Date: Tue, 1 Sep 2015 15:18:21 +0100
Message-ID: <55E5B3AD.4050406@citrix.com>
References: <1440776507-30218-1-git-send-email-anshul.makkar@citrix.com>
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To: Jan Beulich <JBeulich@suse.com>, "Anshul Makkar anshul.makkar"@citrix.com
Cc: yang.z.zhang@intel.com, anshulma <anshul.makkar@citrix.com>, kevin.tian@intel.com, xen-devel@lists.xen.org
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On 31/08/15 09:09, Jan Beulich wrote:
>>>> On 28.08.15 at 17:41, <Anshul Makkar anshul.makkar@citrix.com> 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