Re: [Xen-devel] sources of freebsd with xen-4.2 kernel updates

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Dec 30, 2013 at 04:18:28PM +0400, Igor Kozhukhov wrote:
> 
> On Dec 30, 2013, at 3:25 PM, Roger Pau Monné wrote:
> 
> > On 30/12/13 11:57, Igor Kozhukhov wrote:
> >> Hi Roger,
> >> 
> >> thanks for the link.
> >> I have the same/(similar the same) implementation on illumos(OpenSolaris).
> >> 
> >> do you have plans for grant table v1 & v2 implementation on FreeBSD ?
> > 
> > Grant table v1 is the current implementation, and I don't have plans
> > currently to add support for v2 (cannot speak of others though).
> > 
> > Linux has v2 implemented, but AFAIK there's no user of the new features
> > introduced by v2. Right now with v2 you just end up with less grants,
> > because v2 grants metadata use twice as much memory as v1 grants, and
> > the number of grant frames is limited by the hypervisor.
> > 
> Thanks for your info.
> 
> Could you please let me know - can we use v1 for PV and HVM guests ?
> I looked v2 implementation on Linux and found that v1 is using for HVM, and 
> v2 for PV - but maybe i'm wrong.
> 

You can use V1 for all guests for sure.

My understanding is that the code in Linux's grant-table.c requests V2
form the hypervisor, but it will fall back to using V1 if V2 is not
avaiable.

Wei.

> -Igor
> 
> > Roger.
> > 
> 
> 
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