Re: [Xen-devel] [PATCH 00/22] Vixen: A PV-in-HVM shim

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jan 08, 2018 at 09:03:44AM -0800, Anthony Liguori wrote:
> On Mon, Jan 8, 2018 at 8:39 AM, Ian Jackson <ian.jackson@xxxxxxxxxxxxx> wrote:
> > Wei Liu writes ("Re: [Xen-devel] [PATCH 00/22] Vixen: A PV-in-HVM shim"):
> >> On Mon, Jan 08, 2018 at 08:02:07AM -0800, Anthony Liguori wrote:
> >> > OTOH, the HVM version of the series requires no tools changes and
> >> > works on Xen versions going back to 3.4 (at least).
> >
> > That depends, I think, on how you are selecting the guest kernel.
> >
> > libxl (at least, older libxls) don't support direct kernel boot in HVM
> > mode.  So if you were using kernel= in your config file that won't
> > work without libxl changes which are really hard to do and also
> > maintain ABI compatibility.
> >
> > Likewise bootloader= (eg bootloader="pygrub").
> 
> I think pvgrub is a pretty reasonable alternative to pygrub for most people.
> 
> What we specifically did was take the kernel/etc arguments and used them
> to generate an ISO with isolinux with the shim embedded in the ISO.
> 
> While it does work to set boot="d" and add the ISO to the disk=[] option, we
> preferred to use a wrapper around qemu to directly add a -cdrom option so
> that the ISO would not be exposed as a blkback device.
> 

If you use an ISO which boots isolinux, when and where do you get
hvm_start_info?

Wei.

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