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xen: add capability to load initrd outside of initial mapping

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Modern pvops linux kernels support an initrd not covered by the initial
mapping. This capability is flagged by an elf-note.

In case the elf-note is set by the kernel don't place the initrd into
the initial mapping. This will allow to load larger initrds and/or
support domains with larger memory, as the initial mapping is limited
to 2GB and it is containing the p2m list.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Juergen Gross 2016-03-03 10:38:14 +01:00 • committed by Daniel Kiper
parent d73976fdff
commit 5500cefccd
3 changed files with 53 additions and 11 deletions
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3
grub-core/loader/i386/xen_fileXX.c
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@ -261,6 +261,9 @@ parse_note (grub_elf_t elf, struct grub_xen_file_info *xi,
descsz == 2 ? 2 : 3) == 0)
xi->arch = GRUB_XEN_FILE_I386;
break;
case XEN_ELFNOTE_MOD_START_PFN:
xi->unmapped_initrd = !!grub_le_to_cpu32(*(grub_uint32_t *) desc);
break;
default:
grub_dprintf ("xen", "unknown note type %d\n", nh->n_type);
break;