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Re: s390x/qemu-user: TODO /home/dhildenb/git/qemu/tcg/tci.c:859: tcg_qem
From: |
David Hildenbrand |
Subject: |
Re: s390x/qemu-user: TODO /home/dhildenb/git/qemu/tcg/tci.c:859: tcg_qemu_tb_exec() |
Date: |
Thu, 17 Oct 2019 12:35:32 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
On 17.10.19 12:25, Philippe Mathieu-Daudé wrote:
Hi David,
On 10/17/19 12:02 PM, David Hildenbrand wrote:
Hi,
I'm currently trying to run Fedora 31 under qemu-user
(https://github.com/fedora-cloud/docker-brew-fedora/tree/8a81f67271e959dfc8f8a888b161bbd540b7a83b/s390x)
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
Aborted
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 ...)
Thanks for the hint, will try with --disable-tcg-interpreter
Regards,
Phil.
--
Thanks,
David / dhildenb