On Fri, 2014-11-28 at 20:09 +0300, Andrei Borzenkov wrote:
> В Fri, 28 Nov 2014 08:33:34 +0000
> Ian Campbell <i...@hellion.org.uk> пишет:
>
> > From: Ian Campbell <i...@debian.org>
> >
> > This avoids needing to update all the native update-grub stanzas to also
> > probe
> > for and arrange to load the relevant decompressor, which would be wasteful
> > on
> > native boots.
> >
>
> Could you give some more details why you need it?
In order to boot a Linux kernel under Xen grub needs to extract the ELF
file from the bzImage payload, which is compressed.
The compression algo is a kernel compile time option, gz and xz are the
most probably ones today.
> > +push_all_decompressor_modules(void)
> > +{
> > + grub_install_push_module ("gzio");
> > + grub_install_push_module ("xzio");
> > + grub_install_push_module ("lzopio");
> > +}
> > +
>
> It is not enough. Some of them need another modules that are autoloaded
> by normal.
autoloading should work, I think.
But if not -- how can one determine which modules are required and/or
arrange for them to be added automatically?
>
> > +static void
> > probe_mods (grub_disk_t disk)
> > {
> > grub_partition_t part;
> > @@ -1228,6 +1236,23 @@ main (int argc, char *argv[])
> > }
> > }
> >
> > +
> > + switch (platform)
> > + {
> > + case GRUB_INSTALL_PLATFORM_I386_XEN:
> > + case GRUB_INSTALL_PLATFORM_X86_64_XEN:
> > + /* When booting a Xen PV kernel grub may need to decompress the
> > + * kernel which may use a variety of algorithmns. Since we try
> > + * to reuse the native grub.cfg files rather than trying to
> > + * insmod the relevant decompressors on the fly we build them
> > + * into the core image. This means we avoid needlessly loading
> > + * modules on native. */
> > + push_all_decompressor_modules();
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > grub_install_copy_files (grub_install_source_directory,
> > grubdir, platform);
> >
>
>
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