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Date: Tue, 10 Aug 2021 08:39:00 -0700 From: "Yu, Yu-cheng" <yu-cheng.yu@...el.com> To: Borislav Petkov <bp@...en8.de> CC: <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>, <linux-mm@...ck.org>, <linux-arch@...r.kernel.org>, <linux-api@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>, Balbir Singh <bsingharora@...il.com>, Cyrill Gorcunov <gorcunov@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>, "Eugene Syromiatnikov" <esyr@...hat.com>, Florian Weimer <fweimer@...hat.com>, "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Mike Kravetz <mike.kravetz@...cle.com>, Nadav Amit <nadav.amit@...il.com>, Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, "Ravi V. Shankar" <ravi.v.shankar@...el.com>, Dave Martin <Dave.Martin@....com>, Weijiang Yang <weijiang.yang@...el.com>, Pengfei Xu <pengfei.xu@...el.com>, Haitao Huang <haitao.huang@...el.com>, Rick P Edgecombe <rick.p.edgecombe@...el.com> Subject: Re: [PATCH v28 04/32] x86/cpufeatures: Introduce CPU setup and option parsing for CET On 8/9/2021 9:06 AM, Borislav Petkov wrote: > On Thu, Jul 22, 2021 at 01:51:51PM -0700, Yu-cheng Yu wrote: >> /* >> * Some CPU features depend on higher CPUID levels, which may not always >> * be available due to CPUID level capping or broken virtualization >> @@ -1249,6 +1257,11 @@ static void __init cpu_parse_early_param(void) >> if (cmdline_find_option_bool(boot_command_line, "noxsaves")) >> setup_clear_cpu_cap(X86_FEATURE_XSAVES); >> >> + if (cmdline_find_option_bool(boot_command_line, "no_user_shstk")) >> + setup_clear_cpu_cap(X86_FEATURE_SHSTK); >> + if (cmdline_find_option_bool(boot_command_line, "no_user_ibt")) >> + setup_clear_cpu_cap(X86_FEATURE_IBT); > > Patch 1 says: > > "Disabling shadow stack also disables IBT." > > I don't see that here. > We have X86_FEATURE_IBT dependent on X86_FEATURE_SHSTK (patch #3).
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