Arch Linux User Repository

We've moved to the newly-stable 4.20.0 branch. There are also other changes:

• stubdom is fixed by disabling the vtmp and vtpmmgr components. This gets rid of a few source files and our remaining patches.
• Debug files are only removed if the debug option is not set in makepkg.cfg (or the PKGBUILD itself)
• pygrub has been removed
• optdepends are adjusted for the upcoming xen-grub split package for the various Xen flavored builds.

If you're still using pygrub note that it is deprecated. The solution is to build PV grub instead, which used to be in AUR but is now missing. I am asking a couple questions on the mailing list, and I intend to put my current build of xen-grub (which supersedes xen-pvhgrub) on AUR as soon as possible. If you need to build it before that occurs, you can find it in my PKGBUILD repo.

EDIT: 4.20.0-2 adds support for the xen-edk2 package, which has a fixed UEFI for xen

Most recent change removes OCaml, as it was supposed to be doing that anyway. Building issues are gone.

For those of you facing the issue below:

xentoollog_stubs.c: In function ‘stub_xtl_ocaml_vmessage’: xentoollog_stubs.c:36:1: error: ‘caml_local_roots’ undeclared (first use in this function); did you mean ‘caml_local_roots_ptr’? 36 | caml_local_roots = caml__frame; \ | ^~~~~~~~~~~~~~~~
xentoollog_stubs.c:114:9: note: in expansion of macro ‘CAMLdone’ 114 | CAMLdone;
| ^~~~~~~~
xentoollog_stubs.c:36:1: note: each undeclared identifier is reported only once for each function it appears in 36 | caml_local_roots = caml__frame; \ | ^~~~~~~~~~~~~~~~
xentoollog_stubs.c:114:9: note: in expansion of macro ‘CAMLdone’ 114 | CAMLdone;
| ^~~~~~~~
xentoollog_stubs.c: In function ‘stub_xtl_ocaml_progress’: xentoollog_stubs.c:36:1: error: ‘caml_local_roots’ undeclared (first use in this function); did you mean ‘caml_local_roots_ptr’? 36 | caml_local_roots = caml__frame; \ | ^~~~~~~~~~~~~~~~ xentoollog_stubs.c:140:9: note: in expansion of macro ‘CAMLdone’ 140 | CAMLdone; | ^~~~~~~~

One workaround is to add the option '--disable-ocamltools' to the './configure' command line in the 'build' function inside PKGBUILD.

I experience a same problem like manueljben posted here. During installation I get the same error. I tried older Xen version and I got the same error. I tried to change caml_local_roots to caml_local_roots_ptr, didn't work out.

new problem arised to me today... :-(

xentoollog_stubs.c: In function ‘stub_xtl_ocaml_vmessage’: xentoollog_stubs.c:36:1: error: ‘caml_local_roots’ undeclared (first use in this function); did you mean ‘caml_local_roots_ptr’? 36 | caml_local_roots = caml__frame; \ | ^~~~~~~~~~~~~~~~
xentoollog_stubs.c:114:9: note: in expansion of macro ‘CAMLdone’ 114 | CAMLdone;
| ^~~~~~~~
xentoollog_stubs.c:36:1: note: each undeclared identifier is reported only once for each function it appears in 36 | caml_local_roots = caml__frame; \ | ^~~~~~~~~~~~~~~~
xentoollog_stubs.c:114:9: note: in expansion of macro ‘CAMLdone’ 114 | CAMLdone;
| ^~~~~~~~
xentoollog_stubs.c: In function ‘stub_xtl_ocaml_progress’: xentoollog_stubs.c:36:1: error: ‘caml_local_roots’ undeclared (first use in this function); did you mean ‘caml_local_roots_ptr’? 36 | caml_local_roots = caml__frame; \ | ^~~~~~~~~~~~~~~~ xentoollog_stubs.c:140:9: note: in expansion of macro ‘CAMLdone’ 140 | CAMLdone; | ^~~~~~~~

personal update: It's going to be a bit before I can really look at these changes as I've had hand surgery and typing is not recommended at the moment. Feel free to keep submitting patches here or PRs at my github and I'll update the package itself as soon as I can.

I observed the code and it seems to be a false positive in GCC. I wrote a little patch that silences the warning:

From a033f9c535e41140a3138edbb0d6a89be0e80564 Mon Sep 17 00:00:00 2001
From: Xen Arch <user@xen-arch>
Date: Sat, 6 May 2023 17:58:47 +0200
Subject: [PATCH] Silence false positive use after free warning

---
 tools/libs/guest/xg_offline_page.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/libs/guest/xg_offline_page.c b/tools/libs/guest/xg_offline_page.c
index ccd0299f0f..96f197a801 100644
--- a/tools/libs/guest/xg_offline_page.c
+++ b/tools/libs/guest/xg_offline_page.c
@@ -182,9 +182,11 @@ static int backup_ptes(xen_pfn_t table_mfn, int offset,
     if (backup->max == backup->cur)
     {
         void *orig = backup->entries;
+       // silence false positive warning
+       void *orig2 = orig;

         backup->entries = realloc(
-            orig, backup->max * 2 * sizeof(struct pte_backup_entry));
+            orig2, backup->max * 2 * sizeof(struct pte_backup_entry));

         if (backup->entries == NULL)
         {
--
2.40.1

Simply save it as a .patch file, and drop it in the same folder as the PKGBUILD. Run sha512sum on it and put the patch file in the _patches list and the sha512 sum in the _patch_sums list.

xen fails to build with gcc 13.1.1 with -Werror=use-after-free error. Can we disable -Werror? New gcc versions typically bring new warnings. I respect the decision by the xen devs to treat them as errors. It keeps the code base clean. But it's not really convenient for us users.

in short:

• the guidance comes from the documentation with XSAs and correspondence. example: https://xenbits.xen.org/xsa/advisory-429.html

• though by following the stable branch a lot of these patches already get included

• this pkgbuild has buildtime options, which obviates reproducable builds. at some future date those will be gone

• yay compatibility is not a concern of mine at the moment, and it's in "considered harmful" territory for me regarding servers

• you can see what my future plans are at my repo, but in short i do plan on doing most of what you're asking: https://github.com/refutationalist/saur

sorry for the terse response, typing is a bit diffucult for me at the moment