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Re: s390x/qemu-user: TODO /home/dhildenb/git/qemu/tcg/tci.c:859: tcg_qem

From: Philippe Mathieu-Daudé
Subject: Re: s390x/qemu-user: TODO /home/dhildenb/git/qemu/tcg/tci.c:859: tcg_qemu_tb_exec()
Date: Thu, 17 Oct 2019 12:42:11 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1

On 10/17/19 12:35 PM, David Hildenbrand wrote:
On 17.10.19 12:25, Philippe Mathieu-Daudé wrote:
Hi David,

On 10/17/19 12:02 PM, David Hildenbrand wrote:

I'm currently trying to run Fedora 31 under qemu-user
in order to debug  a vector instruction issue.

Strangely, when trying to chroot into above rootfs and running
/bin/bash, I get

t460s: ~/f31  $ sudo chroot . ./qemu-s390x  /bin/bash
TODO /home/dhildenb/git/qemu/tcg/tci.c:859: tcg_qemu_tb_exec()
/home/dhildenb/git/qemu/tcg/tci.c:859: tcg fatal error

But it's not fundamentally broken:

t460s: ~/f31  $ sudo chroot . ./qemu-s390x  /bin/ls
bin   dev  home  lib64       media  opt   qemu-s390x  run   srv  tmp var
boot  etc  lib   lost+found  mnt    proc  root        sbin  sys  usr

I do wonder why we don't run into the same issue under qemu-systems390x.

Are you also using TCI in system emulation?

Most probably not. It took me longer than expected to find a ./configure variant that at least allows me to build static qemu-user binaries. Most probably something sneeked in there.

Can you simply use TCG to debug your vector instruction issue instead?

I was using

./configure --disable-strip --disable-werror --python=/usr/bin/python3 --enable-tcg-interpreter --disable-system --enable-linux-user --static --disable-pie --disable-sdl --disable-gtk --disable-spice --disable-tools --disable-guest-agent --disable-guest-agent-msi --disable-curses --disable-curl --disable-gnutls --disable-gcrypt --disable-nettle --disable-cap-ng --disable-brlapi --disable-mpath --disable-capstone --disable-xen --disable-rdma --extra-ldflags="-Wl,-z,relro -Wl,-z,now" --target-list=s390x-linux-user

inspired by the Fedora rpm SPEC.

"--enable-tcg-interpreter" is the relevant bit I blindly copied without thinking about it (in the rpm SPEC, it is wrapped by an ifdef ...)

I thought there was a patch adding a big warning when ./configure is run with this option, but I can't find it so maybe we just talked about it.

Thanks for the hint, will try with --disable-tcg-interpreter



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