This was probably useful as a sanity check when the "__xen_guest"
section were not legacy. But now ELF notes are prefered and
"should live in a PT_NOTE segment" (elfnote.h).
This check is unnecessary as elf_xen_parse() from xen/common/libelf
will do the right thing and look for ELFNOTEs in the different places
in order of preference. elf_xen_parse() will still be able to also
look for the legacy "__xen_guest" section without the check in libxc.
This patch would allow to write a simpler ELF header for an OVMF blob
(which isn't an ELF) and allow it to be loaded as a PVH kernel. The
header only needs to declare two program segments:
- one to tell an ELF loader where to put the blob,
- one for a Xen ELFNOTE.
The ELFNOTE is to comply to the pvh design which wants the
XEN_ELFNOTE_PHYS32_ENTRY to declare a blob as compaptible with the PVH
boot ABI.
Note that without the ELFNOTE, libxc will load an ELF but with
the plain ELF loader, which doesn't check for shstrtab.
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
Notes:
v2: Rework commit message, explain why the check is unnecessary.
tools/libxc/xc_dom_elfloader.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/tools/libxc/xc_dom_elfloader.c b/tools/libxc/xc_dom_elfloader.c
index 82b5f2ee79..b327db219d 100644
--- a/tools/libxc/xc_dom_elfloader.c
+++ b/tools/libxc/xc_dom_elfloader.c
@@ -165,15 +165,6 @@ static elf_negerrnoval xc_dom_parse_elf_kernel(struct xc_dom_image *dom)
return rc;
}
- /* Find the section-header strings table. */
- if ( ELF_PTRVAL_INVALID(elf->sec_strtab) )
- {
- xc_dom_panic(dom->xch, XC_INVALID_KERNEL, "%s: ELF image"
- " has no shstrtab", __FUNCTION__);
- rc = -EINVAL;
- goto out;
- }
-
/* parse binary and get xen meta info */
elf_parse_binary(elf);
if ( elf_xen_parse(elf, &dom->parms) != 0 )
--
Anthony PERARD
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel