[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen stable-4.16] x86/spec-ctrl: Use a taint for CET without MSR_SPEC_CTRL
commit bf67861f787cf2b32503005575d326fc2d0a2ff7 Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Mon Jun 5 11:09:11 2023 +0100 Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CommitDate: Tue Aug 8 16:02:54 2023 +0100 x86/spec-ctrl: Use a taint for CET without MSR_SPEC_CTRL Reword the comment for 'S' to include an incompatible set of features on the same core. Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> (cherry picked from commit 3f63f4510422c29fda7ba238b880cbb53eca34fe) --- xen/arch/x86/spec_ctrl.c | 3 +++ xen/common/kernel.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c index 701843311c..302a53fa12 100644 --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -1139,7 +1139,10 @@ void __init init_speculation_mitigations(void) if ( read_cr4() & X86_CR4_CET ) { if ( !has_spec_ctrl ) + { printk(XENLOG_WARNING "?!? CET active, but no MSR_SPEC_CTRL?\n"); + add_taint(TAINT_CPU_OUT_OF_SPEC); + } else if ( opt_ibrs == -1 ) opt_ibrs = ibrs = true; diff --git a/xen/common/kernel.c b/xen/common/kernel.c index 7ed96521f9..9f22399063 100644 --- a/xen/common/kernel.c +++ b/xen/common/kernel.c @@ -339,7 +339,7 @@ unsigned int tainted; * 'H' - HVM forced emulation prefix is permitted. * 'M' - Machine had a machine check experience. * 'U' - Platform is unsecure (usually due to an errata on the platform). - * 'S' - Out of spec CPU (One core has a feature incompatible with others). + * 'S' - Out of spec CPU (Incompatible features on one or more cores). * * The string is overwritten by the next call to print_taint(). */ -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.16
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