Public bug reported: Issue has been discovered by HPE :
--------------------------------------------------------- Got some updates on this. Firstly, we are using Ubuntu 24.04 LTS Base as 26.04 is not out yet. This means QEMU version is 8.2.2. I tried to use Windows 11 25H2 ISO instead and this sort of worked. We got past install and into the setup wizard. But as soon as Windows Updates were downloaded and kicked off, the system went back to KMODE EXCEPTION (0x1E) I believe this only occurs if Secure Boot is enabled (UEFI Non secure with SW TPM 2.0 seems to work ok last I checked). ---------------------------------------------------------- There are several articles on it online but short summary https://forum.proxmox.com/threads/amd-bsod-unsupported-processor-since-windows-build-26100-4202-update-kb5060842-its-preview-kb5058499.166828/ Windows 11 released a Windows update several months back that broke it on AMD Processors on KVM when using host-passthrough CPU mode. The solutions suggested out there are often to switch cpu model to x86-64-v4. We noticed this only happens when Secure Boot is used (UEFI non secure is fine). We are trying to dig farther we have it tracked in JIRA as PCCP-7972 but were curious if you all hand any insight here or could help us find a solution as this is something inside kvm/qemu . Thanks, David Estes ---------------------------------- This specific observation is subject of a QEMU issue Windows 11 24H2 (KB5063060) fails to boot with 'UNSUPPORTED PROCESSOR' on multi-core QEMU guests with AMD EPYC host (#3001) · Issue · qemu-project/qemu The root cause and QEMU patch https://lore.kernel.org/qemu-devel/[email protected]/ The last update in the QEMU issue tracker from a week ago details the release intercept plans for the fix. Fixed in 10.0.4, though the fixed caused a regression that was fixed in 10.0.6, and confirms 10.1.x has the fix. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2131822 Title: Known Windows 11 KVM Issue AMD KMODE Exception To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2131822/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
