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Re: xen bits broke x32 build
From: |
Peter Maydell |
Subject: |
Re: xen bits broke x32 build |
Date: |
Tue, 11 Apr 2023 13:09:03 +0100 |
On Tue, 11 Apr 2023 at 12:57, Michael Tokarev <mjt@tls.msk.ru> wrote:
>
> 01.04.2023 11:40, Michael Tokarev wrote:
> > After bringing in xen guest support, qemu fails to build on x32:
> >
> > target/i386/kvm/xen-emu.c:876:5: note: in expansion of macro
> > ‘qemu_build_assert’
> > 876 | qemu_build_assert(sizeof(struct vcpu_info) == 64);
> > | ^~~~~~~~~~~~~~~~~
> >
> > This one should be easy to fix, but I wonder if there are other issues
> > with x32 exists..
>
> Ok, I took a look at how to disable this new XEN stuff on x32.
>
> It is the commit 820c1aba519bd072ac71c754733f6c86d8b4309 "xen: add
> CONFIG_XEN_BUS and CONFIG_XEN_EMU options for Xen emulation" adding
> this construct to hw/i386/Kconfig:
>
> config XEN_EMU
> bool
> default y
> depends on KVM && (I386 || X86_64)
>
> Since meson does not know about x32, and while ./conifgure does, it
> is not propagated to meson, and sure not propagated to Kconfig too,
> there's some more work needed to disable XEN_EMU on x32.
Frankly I would prefer to just say "we don't support x32".
It's a weird non-standard configuration that as far as I'm
aware is very little used. Its stats in the debian
popularity-contest graphs peaked at 18 users in 2017, and
have mostly been fluctuating between 1 and 3 for the last
couple of years:
https://popcon.debian.org/stat/sub-x32.png
We're currently planning to deprecate-and-drop 32-bit x86
hosts, which are much more widely used than this. I see
no reason why we should care about this oddball failed
experiment of an ABI...
thanks
-- PMM
Re: xen bits broke x32 build, Michael Tokarev, 2023/04/11
- Re: xen bits broke x32 build,
Peter Maydell <=