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-----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEV76QKkVc4xCGURexaDWVMHDJkrAFAmi58uwACgkQaDWVMHDJ krCIBxAAj/8/RBSSK6ULtDLKbmpRKMVpwEE1Yt8vK95Z/50gVSidtQtofIet+CPY NeN5Y4Aip3w/JFoIQafop8ZASOFjNjhqVEjE75RdtdDacQCyluqWg/2PrJpKkBVv OWTVVVPD9aSZAY0Tk/79ABV8Fbp/EBID5mhJ40GrBhkLZku2ALDj1eQINEjoBedB 2+sCO1MMqynlmglt8FltwFtl0rHgtlhGviuc/QmsxH9FrLIGBlgciW4Rma+LOtAE 4iD1Ij/ICuwA78kPAgrxvs+B1w3QGZhTPvOHjj0c9kKM3jBqphWoMWFUKbFfUK8i 6rM0jZMB8iaUcKJ+Ra+stNmvddLkbya7J9wwHgQWi/kxEMZMxbbbOXwfl1Ya8sha n/kKxm8Lsrjex3RTnd1hoXvGY2blr0dZ97jfjgOqVuYBZih5yWzixQbuf3TAbCZO Kb+fbfC7EsI1N0zuFh42Q1hT0zxYYshNIxtGPjDwspJRkHvhmNjNswXr7sccXhFo P5araDcYN0ul85SlAhQRMB17mle47ETSgh04LRM4Rq3rbweXzghoRj//WcY4YqYS qSJEFzSC7hVwNabG+NBexUaZL8bZRMoE7qx5lmo0q+tTMIQkEG2rqrFz9b1d4JON g6aKyrD8YyRCoBjZAF0tjCwhQgxSKXGsVwzBYl0+RcY+1Lo1L2U= =8wrr -----END PGP SIGNATURE----- Merge tag 'vmscape-for-linus-20250904' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull vmescape mitigation fixes from Dave Hansen: "Mitigate vmscape issue with indirect branch predictor flushes. vmscape is a vulnerability that essentially takes Spectre-v2 and attacks host userspace from a guest. It particularly affects hypervisors like QEMU. Even if a hypervisor may not have any sensitive data like disk encryption keys, guest-userspace may be able to attack the guest-kernel using the hypervisor as a confused deputy. There are many ways to mitigate vmscape using the existing Spectre-v2 defenses like IBRS variants or the IBPB flushes. This series focuses solely on IBPB because it works universally across vendors and all vulnerable processors. Further work doing vendor and model-specific optimizations can build on top of this if needed / wanted. Do the normal issue mitigation dance: - Add the CPU bug boilerplate - Add a list of vulnerable CPUs - Use IBPB to flush the branch predictors after running guests" * tag 'vmscape-for-linus-20250904' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/vmscape: Add old Intel CPUs to affected list x86/vmscape: Warn when STIBP is disabled with SMT x86/bugs: Move cpu_bugs_smt_update() down x86/vmscape: Enable the mitigation x86/vmscape: Add conditional IBPB mitigation x86/vmscape: Enumerate VMSCAPE bug Documentation/hw-vuln: Add VMSCAPE documentation