I tested qemu 1:8.2.2+ds-0ubuntu1.8 from noble-proposed according to
comment #3.
On AMD ROME (fleep):
# Host
ubuntu@fleep:~$ dpkg -l | grep qemu-system-x86
ii qemu-system-x86 1:8.2.2+ds-0ubuntu1.8
ubuntu@fleep:~$ qemu-system-x86_64 -cpu ? | grep -E 'sbpb|ibpb-brtype'
gfni hle ht hypervisor ia64 ibpb ibpb-brtype ibrs ibrs-all ibs intel-pt
sbdr-ssdp-no sbpb sep serialize sgx sgx-aex-notify sgx-debug sgx-edeccssa
# Guest
ubuntu@ubuntu:~$ cpuid -l 0x80000021 -1 -r
CPU:
0x80000021 0x00: eax=0x10000044 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
ubuntu@ubuntu:~$ cat
/sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow
Mitigation: SMT disabled
On AMD Milan: Already verified by Markus in comment #10. Thanks!
=> We see the correct flags on the host, the most-significant bits of
"eax" are set and the "spec_rstack_overflow" shows as "Mitigation" ("SMT
disabled" on EPYC ROME and "Safe RET" on EPYC Milan).
** Tags removed: verification-needed verification-needed-noble
** Tags added: verification-done verification-done-noble
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https://bugs.launchpad.net/bugs/2101944
Title:
Expose bits related to SRSO vulnerability
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