Re: [Xen-users] Running Xen with Hardware Virtualization under AMD

["Mathew Brown" <mathewbrown@xxxxxxxxxxx>]

Thanks Mats and Thomas.  It looks like AMD is a lot more
straight-forward in what's needed for HVM :)

Petersson, Mats wrote:
>  
>
>> -----Original Message-----
>> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
>> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
>> Thomas Harold
>> Sent: 09 October 2006 01:44
>> To: Mathew Brown
>> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
>> Subject: Re: [Xen-users] Running Xen with Hardware 
>> Virtualization under AMD
>>
>> Mathew Brown wrote:
>>> Hi,
>>>   I just ran across 
>> http://wiki.xensource.com/xenwiki/IntelVT which says
>>>   that the "Intel website claims that hardware VT requires 
>> processor,
>>>   chipset, bios, and software / OS support".  I was considering
>>>   purchasing an AMD Turion X2 based laptop (yes - I know that Xen
>>>   doesn't currently support ACPI) and was wondering if 
>> anyone can shed
>>>   light on what I have to check for to see if the laptop 
>> will run Xen
>>>   using hardware virtualization.  Thanks for your help.
>> It needs to be an AM2 socket CPU.  Almost all of the AM2 CPUs support 
>> HVM (except the AM2 Sempron CPUs which do not support HVM).
>>
>> http://wiki.xensource.com/xenwiki/HVM_Compatible_Processors
>
> From a technical perspective, the Turion X2 uses a different socket than
> AM2 (I think it's called S1, but that could be an Internal AMD name,
> rather than the public name). There are, however, no Turion X2 that
> doesn't also have AMD-V. So any turion X2 machine will automatically
> support Xen with HVM. 
>
> I believe ACPI is supported, but frequency-management under Xen is not
> well-supported (if at all) - and there's need for work on this,
> particularly in creating a "policy module" that takes into account the
> other domains requirements, not just Dom0 [In the current
> implementation, you could quite easily have very confused scenarios if
> the DomU is using 100% cpu and Dom0 nearly none - then the power policy
> would reduce the CPU-speed to minimum]. 
>
> However, if you just use the laptop for "plugged in" work when playing
> with Xen - or don't mind too much if the battery drains quickly, there's
> no reason to NOT use this type of machine. 
>
> --
> Mats
>
>
>

-- 
  Mathew Brown
  mathewbrown@xxxxxxxxxxx

-- 
http://www.fastmail.fm - Same, same, but different?


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