* [REGRESSION]: fwd: regression in 6.15.5: KVM guest launch FAILSs with missing CPU feature error (sbpb, ibpb-brtype)
[not found] <a34aef44-75e1-49d7-8210-5269542c1857@dev-mail.net>
@ 2025-07-15 22:03 ` pgnd
0 siblings, 0 replies; only message in thread
From: pgnd @ 2025-07-15 22:03 UTC (permalink / raw)
To: linux-kernel; +Cc: jpoimboe
(already submitted @ Fedora; cc'd to regressions@.
advised to post to 'upstream' as well.
not stable@, but here, i'm just told ... my bad)
-------- Forwarded Message --------
Subject: regression in 6.15.5: KVM guest launch FAILSs with missing CPU feature error (sbpb, ibpb-brtype)
Date: Sun, 13 Jul 2025 17:37:57 -0400
From: pgnd <pgnd@dev-mail.net>
Reply-To: pgnd@dev-mail.net
To: kernel@lists.fedoraproject.org
i'm seeing a regression on Fedora 42 kernel 6.15.4 -> 6.15.5 on AMD Ryzen 5 5600G host (x86_64)
kvm guests that launch ok under kernels 6.15.[3,4] fail with the following error when attempting to autostart under 6.15.5:
internal error: Failed to autostart VM: operation failed: guest CPU doesn't match specification: missing features: sbpb,ibpb-brtype
no changes made to libvirt, qemu, or VM defs between kernel versions.
re-booting to old kernel versions restores expected behavior.
maybe related (?) to recent changes in AMD CPU feature exposure / mitigation handling in kernel 6.15.5?
i've opened a bug:
https://bugzilla.redhat.com/show_bug.cgi?id=2379784
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[not found] <a34aef44-75e1-49d7-8210-5269542c1857@dev-mail.net>
2025-07-15 22:03 ` [REGRESSION]: fwd: regression in 6.15.5: KVM guest launch FAILSs with missing CPU feature error (sbpb, ibpb-brtype) pgnd
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