Re: [Xen-devel] [PATCH 10/25] libxl: create vIOMMU during domain construction

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Jul 05, 2017 at 06:53:31PM +0800, Lan Tianyu wrote:
> On 2017年07月04日 19:03, Wei Liu wrote:
> > On Tue, Jul 04, 2017 at 11:46:18AM +0100, Julien Grall wrote:
> >> Hi,
> >>
> >> On 06/29/2017 06:50 AM, Lan Tianyu wrote:
> >>> diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
> >>> index bffbc45..55119e2 100644
> >>> --- a/tools/libxl/libxl_create.c
> >>> +++ b/tools/libxl/libxl_create.c
> >>> @@ -557,6 +557,12 @@ int libxl__domain_make(libxl__gc *gc, 
> >>> libxl_domain_config *d_config,
> >>>           }
> >>>       }
> >>> +    rc = libxl__arch_create_viommu(gc, d_config, *domid);
> >>> +    if (rc < 0) {
> >>> +        LOGED(ERROR, *domid, "create vIOMMU fail");
> >>> +        goto out;
> >>> +    }
> >>> +
> >>
> >> Rather than creating yet another arch helper, would not it be better to 
> >> have
> >> a "post domain creation helper" that will do anything arch specific related
> >> (i.e creating vIOMMU, save config...)?
> >>
> > 
> > Yes if this can be done this is preferable -- I'm not yet sure if the
> > creation of viommu needs to be done at a particular point.
> > 
> 
> Hi Wei & Julien:
> I am not sure the meaning of "post domain creation helper" here.
> Could you elaborate it? Thanks. We can add a new function and do arch
> specific operation for vIOMMU and use vIOMMU type to identify different
> arch.
> 
> So far, creation of viommu doesn't require at particular point. Thanks.
> 

There are already a lot of hooks in libxl, see libxl_arch.h.

What Julien meant was you don't necessarily need to introduce
libxl__arch_create_viommu when you can put the code into one of the
existing hooks.

Given the code needed is simply calling an xc function, I think it can
be put into one of those hooks.

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