Re: [Xen-devel] [PATCH v4 08/14] hvmloader: Locate the BIOS blob

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, 5 Apr 2016, Jan Beulich wrote:
> >>> On 14.03.16 at 18:55, <anthony.perard@xxxxxxxxxx> wrote:
> > --- a/tools/firmware/hvmloader/hvmloader.c
> > +++ b/tools/firmware/hvmloader/hvmloader.c
> > @@ -253,10 +253,40 @@ static void acpi_enable_sci(void)
> >      BUG_ON(!(pm1a_cnt_val & ACPI_PM1C_SCI_EN));
> >  }
> >  
> > +const struct hvm_modlist_entry *get_module_entry(
> > +    const struct hvm_start_info *info,
> > +    const char *name)
> > +{
> > +    const struct hvm_modlist_entry *modlist =
> > +        (struct hvm_modlist_entry *)info->modlist_paddr;
> 
> This cast puzzles me (as at the first glance I would expect it to
> cause a compiler warning): Roger, how come cmdline_paddr,
> modlist_paddr, and rsdp_paddr are 32-bit quantities? While on
> x86 that _may_ be fine, what about other architectures we may
> want to run Xen on?

I've always considered this protocol x86 specific TBH, and since guests 
are started in 32bit mode I have always considered mandatory to have all 
this information available below the 4GiB boundary.

I don't mind changing the sizes to be 64bits, it's a fairly easy change 
that could be done before the release.

Roger.

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