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Tue, 15 Jul 2025 18:03:13 -0400 (EDT) Message-ID: <48ef184c-0160-4a50-aeb5-013e60fc7b40@dev-mail.net> Date: Tue, 15 Jul 2025 18:03:13 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: pgnd Subject: [REGRESSION]: fwd: regression in 6.15.5: KVM guest launch FAILSs with missing CPU feature error (sbpb, ibpb-brtype) Reply-To: pgnd@dev-mail.net References: Content-Language: en-US, es-ES To: linux-kernel@vger.kernel.org Cc: jpoimboe@kernel.org In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit (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 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