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Message-Id: <20230327075838.5403-33-xin3.li@intel.com> Date: Mon, 27 Mar 2023 00:58:37 -0700 From: Xin Li <xin3.li@...el.com> To: linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, peterz@...radead.org, andrew.cooper3@...rix.com, seanjc@...gle.com, pbonzini@...hat.com, ravi.v.shankar@...el.com, jiangshanlai@...il.com, shan.kang@...el.com Subject: [PATCH v6 32/33] x86/fred: disable FRED by default in its early stage Disable FRED by default in its early stage. To enable FRED, a new kernel command line option "fred" needs to be added. Tested-by: Shan Kang <shan.kang@...el.com> Signed-off-by: Xin Li <xin3.li@...el.com> --- Documentation/admin-guide/kernel-parameters.txt | 4 ++++ arch/x86/kernel/cpu/common.c | 3 +++ 2 files changed, 7 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 6221a1d057dd..c55ea60e1a0c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1498,6 +1498,10 @@ Warning: use of this parameter will taint the kernel and may cause unknown problems. + fred + Forcefully enable flexible return and event delivery, + which is otherwise disabled by default. + ftrace=[tracer] [FTRACE] will set and start the specified tracer as early as possible in order to facilitate early diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index eea41cb8722e..4db5e619fc97 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1467,6 +1467,9 @@ static void __init cpu_parse_early_param(void) char *argptr = arg, *opt; int arglen, taint = 0; + if (!cmdline_find_option_bool(boot_command_line, "fred")) + setup_clear_cpu_cap(X86_FEATURE_FRED); + #ifdef CONFIG_X86_32 if (cmdline_find_option_bool(boot_command_line, "no387")) #ifdef CONFIG_MATH_EMULATION -- 2.34.1
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