From: Zhenzhong Duan <zhenzhong.duan@oracle.com> To: <linux-kernel@vger.kernel.org> Cc: <mingo@redhat.com>, <konrad.wilk@oracle.com>, <dwmw@amazon.co.uk>, <tglx@linutronix.de>, <srinivas.eeda@oracle.com>, <bp@suse.de>, <peterz@infradead.org>, <hpa@zytor.com> Subject: [PATCH v3 2/2] retpolines: Remove the minimal stuff of retpoline support Date: Fri, 2 Nov 2018 01:45:41 -0700 (PDT) Message-ID: <f06f0a89-5587-45db-8ed2-0a9d6638d5c0@default> (raw) Now that CONFIG_RETPOLINE hard depends on compiler support, there is no reason for minimal stuff to still exist. [peterz@infradead.org: initial suggestion] Link: Link: https://lore.kernel.org/lkml/caeb3213f13e57191e362ca04f2892cfa2ccda65.camel@infradead.org Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com> Suggested-by: Peter Zijlstra <peterz@infradead.org> Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@suse.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- arch/x86/include/asm/nospec-branch.h | 2 -- arch/x86/kernel/cpu/bugs.c | 13 ++----------- 2 files changed, 2 insertions(+), 13 deletions(-) diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index 8b09cbb..c202a64 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -221,8 +221,6 @@ /* The Spectre V2 mitigation variants */ enum spectre_v2_mitigation { SPECTRE_V2_NONE, - SPECTRE_V2_RETPOLINE_MINIMAL, - SPECTRE_V2_RETPOLINE_MINIMAL_AMD, SPECTRE_V2_RETPOLINE_GENERIC, SPECTRE_V2_RETPOLINE_AMD, SPECTRE_V2_IBRS_ENHANCED, diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index d0108fb..7f6d815 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -135,8 +135,6 @@ enum spectre_v2_mitigation_cmd { static const char *spectre_v2_strings[] = { [SPECTRE_V2_NONE] = "Vulnerable", - [SPECTRE_V2_RETPOLINE_MINIMAL] = "Vulnerable: Minimal generic ASM retpoline", - [SPECTRE_V2_RETPOLINE_MINIMAL_AMD] = "Vulnerable: Minimal AMD ASM retpoline", [SPECTRE_V2_RETPOLINE_GENERIC] = "Mitigation: Full generic retpoline", [SPECTRE_V2_RETPOLINE_AMD] = "Mitigation: Full AMD retpoline", [SPECTRE_V2_IBRS_ENHANCED] = "Mitigation: Enhanced IBRS", @@ -250,11 +248,6 @@ static void __init spec2_print_if_secure(const char *reason) pr_info("%s selected on command line.\n", reason); } -static inline bool retp_compiler(void) -{ - return __is_defined(CONFIG_RETPOLINE); -} - static inline bool match_option(const char *arg, int arglen, const char *opt) { int len = strlen(opt); @@ -417,14 +410,12 @@ static void __init spectre_v2_select_mitigation(void) pr_err("Spectre mitigation: LFENCE not serializing, switching to generic retpoline\n"); goto retpoline_generic; } - mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_AMD : - SPECTRE_V2_RETPOLINE_MINIMAL_AMD; + mode = SPECTRE_V2_RETPOLINE_AMD; setup_force_cpu_cap(X86_FEATURE_RETPOLINE_AMD); setup_force_cpu_cap(X86_FEATURE_RETPOLINE); } else { retpoline_generic: - mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_GENERIC : - SPECTRE_V2_RETPOLINE_MINIMAL; + mode = SPECTRE_V2_RETPOLINE_GENERIC; setup_force_cpu_cap(X86_FEATURE_RETPOLINE); } -- 1.8.3.1
next reply index Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-11-02 8:45 Zhenzhong Duan [this message] 2018-11-06 20:49 ` [tip:x86/pti] x86/retpoline: Remove minimal " tip-bot for Zhenzhong Duan 2018-11-28 14:19 ` tip-bot for Zhenzhong Duan
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