stubdom: disable building pv-grub

The stubdom based pv-grub is using a very outdated version of grub
(0.97) and should not be used any longer. Mainline grub has support for
PV guests for a long time now, so that should be used as a boot loader
of a PV domain.

So disable building pv-grub per default. In case someone really wants
to continue using it he/she can still use a pv-grub binary from an older
Xen version or manually enable building it via:

  configure --enable-pv-grub

[ This was already disabled in osstest by 8dee6e333622
  "make-flight: Drop pvgrub (pvgrub1) tests" -iwj ]

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Ian Jackson <iwj@xenproject.org>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>

CHANGELOG.md

@@ -16,6 +16,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
    appearing in 4.12.2 and 4.11.4). Prior (4.13...4.15-like) behavior can be arranged for
    either by enabling the IOMMU_QUARANTINE_SCRATCH_PAGE setting at build (configuration) time
    or by passing "iommu=quarantine=scratch-page" on the hypervisor command line.
+ - pv-grub stubdoms will no longer be built per default. In order to be able to use pv-grub
+   configure needs to be called with "--enable-pv-grub" as parameter.
 
 ## [4.15.0 UNRELEASED](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.15.0) - TBD
 

stubdom/configure

@@ -1342,7 +1342,7 @@ Optional Features:
   --enable-ioemu-stubdom  Build and install ioemu-stubdom
   --enable-c-stubdom      Build and install c-stubdom (default is DISABLED)
   --enable-caml-stubdom   Build and install caml-stubdom (default is DISABLED)
-  --disable-pv-grub       Build and install pv-grub (default is ENABLED)
+  --enable-pv-grub        Build and install pv-grub (default is DISABLED)
   --disable-xenstore-stubdom
                           Build and install xenstore-stubdom (default is
                           ENABLED)
@@ -2129,11 +2129,7 @@ fi
 else
 
 
-grub=y
-STUBDOM_TARGETS="$STUBDOM_TARGETS grub"
-STUBDOM_BUILD="$STUBDOM_BUILD pv-grub"
-STUBDOM_INSTALL="$STUBDOM_INSTALL install-grub"
-STUBDOM_UNINSTALL="$STUBDOM_UNINSTALL install-grub"
+grub=n
 
 
 fi

stubdom/configure.ac

@@ -21,7 +21,7 @@ m4_include([../m4/fetcher.m4])
 AX_STUBDOM_CONDITIONAL([ioemu-stubdom], [ioemu])
 AX_STUBDOM_DEFAULT_DISABLE([c-stubdom], [c])
 AX_STUBDOM_DEFAULT_DISABLE([caml-stubdom], [caml])
-AX_STUBDOM_DEFAULT_ENABLE([pv-grub], [grub])
+AX_STUBDOM_DEFAULT_DISABLE([pv-grub], [grub])
 AX_STUBDOM_DEFAULT_ENABLE([xenstore-stubdom], [xenstore])
 AX_STUBDOM_DEFAULT_ENABLE([xenstorepvh-stubdom], [xenstorepvh])
 AX_STUBDOM_CONDITIONAL([vtpm-stubdom], [vtpm])