Re: [Xen-devel] [PATCH 5/5] x86/HVM: don't setup an intercept handler for IO port 0xcf8 unconditionally

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.01.16 at 09:35, <roger.pau@xxxxxxxxxx> wrote:
> El 13/01/16 a les 17.48, Paul Durrant ha escrit:
>>> -----Original Message-----
>>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>>> Sent: 13 January 2016 16:39
>>> To: Paul Durrant; Roger Pau Monne
>>> Cc: Andrew Cooper; xen-devel@xxxxxxxxxxxxxxxxxxxx 
>>> Subject: Re: [PATCH 5/5] x86/HVM: don't setup an intercept handler for IO
>>> port 0xcf8 unconditionally
>>>
>>>>>> On 13.01.16 at 13:32, <roger.pau@xxxxxxxxxx> wrote:
>>>> Only intercept accesses to IO port 0xcf8 if there's at least one IOREQ
>>>> server, otherwise it makes no sense since the only code that uses the value
>>>> stored by hvm_access_cf8 is the IOREQ server.
>>>
>>> Afaict an ioreq server could also attach subsequently - Paul?
>>>
>> 
>> Indeed, ioreq servers can come and go at any time.
> 
> Right, then I will have to prevent hvm_access_cf8 from being added if
> the domain is the hardware domain, otherwise it overlaps with the Dom0
> passthrough intercept (handle_pvh_io).

Yes, that indeed makes sense.

Jan


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