Re: [PATCH v28 04/32] x86/cpufeatures: Introduce CPU setup and option parsing for CET
From: Borislav Petkov <bp@alien8.de>
Date: 2021-08-09 16:05:57
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linux-arch, linux-doc, linux-mm, lkml
On Thu, Jul 22, 2021 at 01:51:51PM -0700, Yu-cheng Yu wrote:
quoted hunk ↗ jump to hunk
/* * 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.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette