[Xen-devel] FreeBSD PVHVM call for testing

George Dunlap George.Dunlap at eu.citrix.com
Tue May 14 09:19:09 UTC 2013

On Mon, May 13, 2013 at 7:32 PM, Roger Pau Monné <roger.pau at citrix.com> wrote:
> Hello,
> Recently Justin T Gibbs, Will Andrews and myself have been working on
> improving the Xen support in FreeBSD. The main goal of this was to bring
> full PVHVM support to FreeBSD, right now FreeBSD is only using PV
> interfaces for disk and network interfaces when running as a HVM guest.
> The main benefits of this changes are that Xen virtual interrupts (event
> channels) are now delivered to the guest using a vector callback
> injection, that is a per-cpu mechanism that allows each vCPU to have
> different interrupts assigned, so for example network and disk
> interrupts are delivered to different vCPUs in order to improve
> performance. With this changes FreeBSD also uses PV timers when running
> as an HVM guest, which should provide better time keeping and reduce the
> virtualization overhead, since emulated timers are no longer used. PV
> IPIs can also be used inside a HVM guest, but this will be implemented
> later.
> Right now the code is in a state where it can be tested by users, so we
> would like to encourage FreeBSD and Xen users to test it and provide
> feedback.

Is this something we should try to put on the Xen.org blog?


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