On 19/01/2023 11:01, Laszlo Ersek wrote:
PlatformCpuCountBugCheck: Present=0 Possible=1 PlatformCpuCountBugCheck: Broken CPU hotplug register block found. Update QEMU to version 8+, or PlatformCpuCountBugCheck: to a stable release with commit dab30fbef389 backported. Refer to PlatformCpuCountBugCheck: <https://bugzilla.tianocore.org/show_bug.cgi?id=4250>. PlatformCpuCountBugCheck: Consequences of the QEMU bug may include, but are not limited to: PlatformCpuCountBugCheck: - all firmware logic, dependent on the CPU hotplug register block, PlatformCpuCountBugCheck: being confused, for example, multiprocessing-related logic; PlatformCpuCountBugCheck: - guest OS data loss, including filesystem corruption, due to crash or PlatformCpuCountBugCheck: hang during ACPI S3 resume; PlatformCpuCountBugCheck: - SMM privilege escalation, by a malicious guest OS or 3rd partty UEFI PlatformCpuCountBugCheck: agent, against the platform firmware. PlatformCpuCountBugCheck: These symptoms need not necessarily be limited to the QEMU user PlatformCpuCountBugCheck: attempting to hot(un)plug a CPU. PlatformCpuCountBugCheck: The firmware will now stop (hang) deliberately, in order to prevent the PlatformCpuCountBugCheck: above symptoms. PlatformCpuCountBugCheck: You can forcibly override the hang, *at your own risk*, with the PlatformCpuCountBugCheck: following *experimental* QEMU command line option: PlatformCpuCountBugCheck: -fw_cfg name=opt/org.tianocore/X-Cpuhp-Bugcheck-Override,string=yes PlatformCpuCountBugCheck: Please only report such bugs that you can reproduce *without* the PlatformCpuCountBugCheck: override.
Laszlo: thank you for taking the time to deal with this so thoroughly and to see it through to its conclusion.
For what it's worth: Hugely-appreciated-by: Michael Brown <mc...@ipxe.org> Thanks, Michael -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#98892): https://edk2.groups.io/g/devel/message/98892 Mute This Topic: https://groups.io/mt/96374972/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
