From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ed White <edmund.h.white@intel.com>
Subject: Re: [PATCH v2 04/12] x86/altp2m: basic data structures
 and support routines.
Date: Wed, 24 Jun 2015 10:20:28 -0700
Message-ID: <558AE6DC.9060905@intel.com>
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To: Andrew Cooper <andrew.cooper3@citrix.com>, xen-devel@lists.xen.org
Cc: Ravi Sahita <ravi.sahita@intel.com>, Wei Liu <wei.liu2@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>, Jan Beulich <jbeulich@suse.com>, tlengyel@novetta.com, Daniel De Graaf <dgdegra@tycho.nsa.gov>
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On 06/24/2015 03:06 AM, Andrew Cooper wrote:
>> diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
>> index d0d3f1e..202aa42 100644
>> --- a/xen/arch/x86/mm/hap/hap.c
>> +++ b/xen/arch/x86/mm/hap/hap.c
>> @@ -459,7 +459,7 @@ void hap_domain_init(struct domain *d)
>>  int hap_enable(struct domain *d, u32 mode)
>>  {
>>      unsigned int old_pages;
>> -    uint8_t i;
>> +    uint16_t i;
>>      int rv = 0;
>>  
>>      domain_pause(d);
>> @@ -498,6 +498,24 @@ int hap_enable(struct domain *d, u32 mode)
>>             goto out;
>>      }
>>  
>> +    /* Init alternate p2m data */
>> +    if ( (d->arch.altp2m_eptp = alloc_xenheap_page()) == NULL )
> 
> Please use alloc_domheap_page() and map_domain_page_global() so the
> allocation is accounted against the domain.

You raised this back in January too, and I did try it. Unfortunately,
allocating that way caused repeated Xen panics, and when I reported that
to you and Tim on the list 2 or 3 months ago Tim said that he thought
the existing code was acceptable in this instance, since this is only 1
page per-domain.

Ed