Re: [Xen-devel] [PATCH v4 05/16] libxl: Handle Linux stubdomain specific QEMU options.

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On Mon, Jan 20, 2020 at 02:24:18PM -0500, Jason Andryuk wrote:
> On Tue, Jan 14, 2020 at 9:42 PM Marek Marczykowski-Górecki
> <marmarek@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > From: Eric Shelton <eshelton@xxxxxxxxx>
> >
> > This patch creates an appropriate command line for the QEMU instance
> > running in a Linux-based stubdomain.
> >
> > NOTE: a number of items are not currently implemented for Linux-based
> > stubdomains, such as:
> > - save/restore
> > - QMP socket
> > - graphics output (e.g., VNC)
> >
> > Signed-off-by: Eric Shelton <eshelton@xxxxxxxxx>
> >
> > Simon:
> >  * fix disk path
> >  * fix cdrom path and "format"
> >  * pass downscript for network interfaces
> 
> Since this is here...
> 
> > Signed-off-by: Simon Gaiser <simon@xxxxxxxxxxxxxxxxxxxxxx>
> > [drop Qubes-specific parts]
> 
> ...maybe mention dropping downscript here?  Otherwise the commit
> message and contents don't match.

Ah, indeed.

> 
> > Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> > ---
> 
> <snip>
> 
> > diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
> > index 142b960..a6d40b7 100644
> > --- a/tools/libxl/libxl_create.c
> > +++ b/tools/libxl/libxl_create.c
> > @@ -169,6 +169,31 @@ int libxl__domain_build_info_setdefault(libxl__gc *gc,
> >          }
> >      }
> >
> > +    if (b_info->type == LIBXL_DOMAIN_TYPE_HVM &&
> > +        libxl_defbool_val(b_info->device_model_stubdomain)) {
> > +        if (!b_info->stubdomain_kernel) {
> > +            switch (b_info->device_model_version) {
> > +                case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL:
> > +                    b_info->stubdomain_kernel =
> > +                        libxl__abs_path(NOGC, "ioemu-stubdom.gz", 
> > libxl__xenfirmwaredir_path());
> > +                    b_info->stubdomain_ramdisk = NULL;
> > +                    break;
> > +                case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN:
> > +                    b_info->stubdomain_kernel =
> > +                        libxl__abs_path(NOGC,
> > +                                "stubdom-linux-kernel",
> 
> Not to bikeshed, but this came up in a conversation a little while
> ago.  Stubdom is a generic name, and this code is for a device model.
> So some combination of qemu{,-dm}{,-linux}-kernel seems more
> descriptive.

Minios-based use ioemu-stubdom, so maybe
ioemu-stubdom-linux-{kernel,rootfs}?

> Having said that, I'm fine with it as is since I don't imagine more
> stubdoms showing up.
> 
> > +                                libxl__xenfirmwaredir_path());
> > +                    b_info->stubdomain_ramdisk =
> > +                        libxl__abs_path(NOGC,
> > +                                "stubdom-linux-rootfs",
> > +                                libxl__xenfirmwaredir_path());
> > +                    break;
> > +                default:
> > +                    abort();
> 
> Can we return an error instead?

For invalid enum value? 

> > +            }
> > +        }
> > +    }
> > +
> >      if (!b_info->max_vcpus)
> >          b_info->max_vcpus = 1;
> >      if (!b_info->avail_vcpus.size) {
> 
> <snip>
> 
> Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx>

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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