Xen stuff

[Kip Macy]

Real mode emulation wasn't fixed until 3.3 in the mercurial sources.
Presumably the Cambridge folks backported the necessary fixes for
their supported products.

-Kip

On Wed, Dec 3, 2008 at 12:38 PM, Doug Rabson <dfr at rabson.org> wrote:
>
> On 3 Dec 2008, at 19:27, Alexandre Sunny Kovalenko wrote:
>
>>
>> On Mon, 2008-12-01 at 21:54 +0000, Doug Rabson wrote:
>>>
>>> On 1 Dec 2008, at 18:45, Ivan Voras wrote:
>>>
>>>> 2008/12/1 Doug Rabson <dfr at rabson.org>:
>>>>>
>>>>> I will be working on improving Xen support in FreeBSD for the new few
>>>>
>>>> Great!
>>>>
>>>>> months. My main goal is to add support for native Xen drivers to an
>>>>> amd64
>>>>> kernel which is running in Xen's HVM mode. These drivers will take
>>>>> over from
>>>>> the slow emulated devices and provide most of the performance
>>>>> benefits of a
>>>>> paravirtualised kernel. I'm initially going to be supporting
>>>>> FreeBSD 6.x but
>>>>> I will port it all forward to head and 7.x when it works properly.
>>>>
>>>> For the not-quite-yet-initiated : does this mean you're working on
>>>> paravirtualized drivers for Xen dom-U ("guest" case)?
>>>
>>> Sort of. The latest versions of Xen support something called HVM mode
>>> which allows it to boot a completely unmodified guest OS using
>>> emulated devices in a similar way to e.g. VMware Fusion. It is then
>>> possible to incrementally add Xen-aware paravirtualised drivers which
>>> can replace the emulated ones and which perform better. This is how
>>> they support Windows under Xen.
>>
>> Did you get to run FreeBSD in HVM mode? What version of Xen, and who was
>> playing the dom0?
>>
>> The reason for the question is that I have patchy experience with HVM:
>> while I have Windows XP Professional running happily, OpenSolaris 2008.5
>> would lock up on the regular basis.
>>
>> I am running Xen 3.2.1 with OpenSuse x86_64 11.0 in the dom0.
>
> I'm running XenServer 5.0 which is (I think) running a linux-2.6.18 kernel
> with roughly xen-3.2.2.
>
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