Date: Mon, 1 Dec 2008 21:54:05 +0000 From: Doug Rabson <dfr@rabson.org> To: "Ivan Voras" <ivoras@gmail.com> Cc: freebsd-xen@freebsd.org Subject: Re: Xen stuff Message-ID: <96346214-38CC-4EA9-97DA-C5C1EE358EDA@rabson.org> In-Reply-To: <9bbcef730812011045t4769cb76g2028c5f9c39af524@mail.gmail.com> References: <4389C4C1-0EEB-4841-8F02-DC44BBC223F4@rabson.org> <9bbcef730812011045t4769cb76g2028c5f9c39af524@mail.gmail.com>
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On 1 Dec 2008, at 18:45, Ivan Voras wrote:
> 2008/12/1 Doug Rabson <dfr@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.
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