[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [XEN PATCH for-4.13] tools/configure: Honour XEN_COMPILE_ARCH and _TARGET_ for shim
On Tue, 19 Nov 2019 at 16:47, Ian Jackson <ian.jackson@xxxxxxxxxx> wrote: [...] > > > >From 1a8de36699b9042c30797e05f7a5f4313d7f7ad1 Mon Sep 17 00:00:00 2001 > > From: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> > > Date: Tue, 29 Oct 2019 17:45:30 +0000 > > Subject: [PATCH] tools/configure: Honour XEN_COMPILE_ARCH and _TARGET_ for > > shim > > MIME-Version: 1.0 > > Content-Type: text/plain; charset=UTF-8 > > Content-Transfer-Encoding: 8bit > > > > The pvshim can only be built 64-bit because the hypervisor is only > > 64-bit nowadays. The hypervisor build supports XEN_COMPILE_ARCH and > > XEN_TARGET_ARCH which override the information from uname. The pvshim > > build runs out of the tools/ directory but calls the hypervisor build > > system. > > > > If one runs in a Linux 32-bit userland with a 64-bit kernel, one used > > to be able to set XEN_COMPILE_ARCH. But nowadays this does not work. > > configure sees the target cpu as 64-bit and tries to build pvshim. > > The build prints > > echo "*** Xen x86/32 target no longer supported!" > > and doesn't build anything. Then the subsequent Makefiles try to > > install the non-built pieces. > > > > Fix this anomaly by causing configure to honour the Xen hypervisor way > > of setting the target architecture. > > > > In principle this user behaviour is not handled quite right, because > > configure will still see 64-bit and so all the autoconf-based > > architecture testing will see 64-bit rather than 32-bit x86. But the > > tools are in fact generally quite portable: this particular location > > in configure{.ac,} is the only place in tools/ where 64-bit x86 is > > treated differently from 32-bit x86, so the fix is sufficient and > > correct for this use case. > > > > It remains the case that XEN_COMPILE_ARCH or XEN_TARGET_ARCH to a > > non-x86 architecture, when configure thinks things are x86, or vice > > versa, will not work right. > > > > (This is a bugfix to 8845155c831c > > pvshim: make PV shim build selectable from configure > > which inadvertantly deleted the logic to only build the shim for > > XEN_TARGET_ARCH != x86_32.) > > > > I have rerun autogen.sh, so this patch contains the fix to configure > > as well as the source fix to configure.ac. > > > > Fixes: 8845155c831c59e867ee3dd31ee63e0cc6c7dcf2 > > Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> > > CC: Olaf Hering <olaf@xxxxxxxxx> > > CC: Roger Pau Monné <roger.pau@xxxxxxxxxx> > > Release-acked-by: Jürgen Groß <jgross@xxxxxxxx> Reviewed-by: Wei Liu <wl@xxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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