New architectural features and CPUID bits related to the Speculative Return Stack Overflow (SRSO) vulnerability. Arnaldo Carvalho de Melo (2): tools headers cpufeatures: Sync with the kernel sources tools arch x86: Sync the msr-index.h copy with the kernel sources Borislav Petkov (AMD) (9): x86/bugs: Increase the x86 bugs vector size to two u32s x86/srso: Add a Speculative RAS Overflow mitigation x86/srso: Add IBPB_BRTYPE support x86/srso: Add SRSO_NO support x86/srso: Add IBPB x86/srso: Add IBPB on VMEXIT x86/srso: Tie SBPB bit setting to microcode patch detection x86/srso: Disable the mitigation on unaffected configurations x86/srso: Correct the mitigation status when SMT is disabled Jialin Zhang (1): x86/cpufeatures: Fix abi breakage caused by NCAPINTS in cpufeature header file. Josh Poimboeuf (2): x86/srso: Fix return thunks in generated code objtool: Add frame-pointer-specific function ignore Kim Phillips (1): x86/cpu, kvm: Add support for CPUID_80000021_EAX Nick Desaulniers (1): x86/srso: Fix build breakage with the LLVM linker Nikolay Borisov (1): kabi: Allow extra bugsints (bsc#1213927). Peter Zijlstra (10): x86/ibt: Add ANNOTATE_NOENDBR x86/cpu: Fix __x86_return_thunk symbol type x86/cpu: Fix up srso_safe_ret() and __x86_return_thunk() x86/alternative: Make custom return thunk unconditional x86/cpu: Clean up SRSO return thunk mess x86/cpu: Rename original retbleed methods x86/cpu: Rename srso_(.*)_alias to srso_alias_\1 x86/cpu: Cleanup the untrain mess objtool/x86: Fixup frame-pointer vs rethunk objtool/x86: Fix SRSO mess Sean Christopherson (1): x86/retpoline: Don't clobber RFLAGS during srso_safe_ret() Documentation/admin-guide/hw-vuln/index.rst | 1 + Documentation/admin-guide/hw-vuln/srso.rst | 133 ++++++++++++ .../admin-guide/kernel-parameters.txt | 11 + arch/x86/Kconfig | 7 + arch/x86/include/asm/cpufeature.h | 23 +- arch/x86/include/asm/cpufeatures.h | 15 +- arch/x86/include/asm/msr-index.h | 1 + arch/x86/include/asm/nospec-branch.h | 34 ++- arch/x86/include/asm/processor.h | 7 +- arch/x86/kernel/alternative.c | 2 +- arch/x86/kernel/cpu/amd.c | 19 ++ arch/x86/kernel/cpu/bugs.c | 197 ++++++++++++++++++ arch/x86/kernel/cpu/common.c | 17 +- arch/x86/kernel/cpu/mkcapflags.sh | 2 +- arch/x86/kernel/cpu/proc.c | 2 +- arch/x86/kernel/cpu/scattered.c | 3 + arch/x86/kernel/vmlinux.lds.S | 38 +++- arch/x86/kvm/cpuid.c | 3 + arch/x86/kvm/svm/svm.c | 4 +- arch/x86/kvm/svm/vmenter.S | 3 + arch/x86/lib/retpoline.S | 135 ++++++++++-- drivers/base/cpu.c | 8 + include/linux/cpu.h | 2 + include/linux/objtool.h | 28 +++ tools/arch/x86/include/asm/cpufeatures.h | 16 +- tools/arch/x86/include/asm/msr-index.h | 1 + tools/include/linux/objtool.h | 28 +++ tools/objtool/arch.h | 1 + tools/objtool/arch/x86/decode.c | 6 + tools/objtool/check.c | 41 +++- tools/objtool/elf.h | 1 + .../perf/trace/beauty/tracepoints/x86_msr.sh | 2 +- 32 files changed, 740 insertions(+), 51 deletions(-) create mode 100644 Documentation/admin-guide/hw-vuln/srso.rst -- 2.25.1