Seems like you're intending to fix qemu, but we might also
change libguestfs (RHEL 9.2 only) to use a different -cpu flag.
However I'd also note that TCG is used by OpenStack and CNV
for testing and is "soft supported" for those cases too.

> I met one error while compiling it inside guest. Did I miss some parameters?
> 
> # gcc test.c 
> test.c: In function ‘test_adox_adcx’:
> test.c:27:5: error: inconsistent operand constraints in an ‘asm’
>    27 |     asm("push %0; popf;"
>       |     ^~~

Yes, please add "-O2" (same on the host in fact).

(In reply to Paolo Bonzini from comment #6)
> > I met one error while compiling it inside guest. Did I miss some parameters?
> > 
> > # gcc test.c 
> > test.c: In function ‘test_adox_adcx’:
> > test.c:27:5: error: inconsistent operand constraints in an ‘asm’
> >    27 |     asm("push %0; popf;"
> >       |     ^~~
> 
> Yes, please add "-O2" (same on the host in fact).

Thanks.

Reproduced this issue now while running the executable file with qemu-kvm-7.2.0-10.el9.x86_64.
# gcc test.c -O2
  a.out  test.c

# ./a.out 
0
1
a.out: test.c:34: test_adox_adcx: Assertion `out_adcx == in_c + adcx_operand - 1' failed.
Aborted (core dumped)

Test PASS with qemu-kvm-7.2.0-14.el9_2.x86_64.

Test Env:
  host:  kernel-5.14.0-284.2.1.el9_2.x86_64
  guest: kernel-5.14.0-284.2.1.el9_2.x86_64

Test results.
# ./a.out 
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15


Mark Verified:Tested.

Hi Yongkui,

Would you please help to do some sanity test on libguestfs side?
Thanks.


Best regards
Nana

Tested with the following packages on RHEL9.2 host:

libguestfs-1.50.1-3.el9.x86_64
qemu-kvm-7.2.0-14.el9_2.x86_64
kernel-5.14.0-289.el9.x86_64


Steps:

1.
$ LIBGUESTFS_BACKEND=direct LIBGUESTFS_BACKEND_SETTINGS=force_tcg libguestfs-test-tool
...
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -help
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -machine q35,accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: command: run: echo '{ "execute": "qmp_capabilities" }' '{ "execute": "query-qmp-schema" }' '{ "execute": "quit" }'  | QEMU_AUDIO_DRV=none "/usr/libexec/qemu-kvm" -display none -machine "q35,accel=kvm:tcg" -qmp stdio
libguestfs: command: run: echo '{ "execute": "qmp_capabilities" }' '{ "execute": "query-kvm" }' '{ "execute": "quit" }'  | QEMU_AUDIO_DRV=none "/usr/libexec/qemu-kvm" -display none -machine "q35,accel=kvm:tcg" -qmp stdio
libguestfs: saving test results
libguestfs: qemu version: 7.2
libguestfs: qemu mandatory locking: yes
libguestfs: qemu KVM: enabled
libguestfs: finished testing qemu features
libguestfs: command: run: dmesg | grep -Eoh 'lpj=[[:digit:]]+'
libguestfs: read_lpj_from_dmesg: external command exited with error status 1
libguestfs: read_lpj_from_files: no boot messages files are readable
/usr/libexec/qemu-kvm \
    -global virtio-blk-pci.scsi=off \
    -no-user-config \
    -nodefaults \
    -display none \
    -machine q35,accel=tcg,graphics=off \
    -cpu max,la57=off \
    -m 1280 \
    -no-reboot \
    -rtc driftfix=slew \
    -no-hpet \
    -global kvm-pit.lost_tick_policy=discard \
    -kernel /var/tmp/.guestfs-1002/appliance.d/kernel \
    -initrd /var/tmp/.guestfs-1002/appliance.d/initrd \
    -object rng-random,filename=/dev/urandom,id=rng0 \
    -device virtio-rng-pci,rng=rng0 \
    -device virtio-scsi-pci,id=scsi \
    -drive file=/tmp/libguestfsjB8ZPO/scratch1.img,cache=unsafe,format=raw,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive file=/var/tmp/.guestfs-1002/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none \
    -device scsi-hd,drive=appliance \
    -device virtio-serial-pci \
    -serial stdio \
    -chardev socket,path=/run/user/0/libguestfsfk99Id/guestfsd.sock,id=channel0 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -append "panic=1 console=ttyS0 edd=off udevtimeout=6000 udev.event-timeout=6000 no_timer_check printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests tsc=reliable 8250.nr_uarts=1 root=UUID=3f0fe7b3-4257-4eb7-a56f-d1714f8d62bf selinux=0 guestfs_verbose=1 TERM=xterm-256color"
\x1bc\x1b[?7l\x1b[2J\x1b[0mSeaBIOS (version 1.16.1-1.el9)
Booting from ROM..\x1bc\x1b[?7l\x1b[2J[    0.000000] Linux version 5.14.0-289.el9.x86_64 (mockbuild.eng.bos.redhat.com) (gcc (GCC) 11.3.1 20221121 (Red Hat 11.3.1-4), GNU ld version 2.35.2-37.el9) #1 SMP PREEMPT_DYNAMIC Sun Mar 19 06:09:51 EDT 2023
...
===== TEST FINISHED OK =====

Sanity check passed on libguestfs side.

Thanks!

Move this bug to verified according to Comment 19 and Comment 23.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: qemu-kvm security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:2162