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

[Roger Pau Monnà <roger.pau@xxxxxxxxxx>]

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).

Roger.


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