From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH] x86/PCI: Intercept Dom0 MMCFG from dom0s in
 HVM containers
Date: Wed, 16 Dec 2015 14:34:08 -0500
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To: Jan Beulich <JBeulich@suse.com>
Cc: andrew.cooper3@citrix.com, xen-devel@lists.xen.org
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On 12/16/2015 04:04 AM, Jan Beulich wrote:
>
>> --- a/xen/arch/x86/hvm/hvm.c
>> +++ b/xen/arch/x86/hvm/hvm.c
>> @@ -3116,6 +3116,21 @@ int hvm_hap_nested_page_fault(paddr_t gpa, unsigned long gla,
>>           goto out_put_gfn;
>>       }
>>   
>> +    if ( (p2mt == p2m_mmio_direct) && is_hardware_domain(currd) )
> The PV condition includes a PFEC_page_present check, and I think
> an equivalent should be added here too.

Hmm.. So how would I determine that? I can see how this is available in 
SVM (although it is not reflected in npfec) but in VMX I don't see 
direct indication of whether the page was present.

-boris