From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
To: Linux-Kernel <linux-kernel@vger.kernel.org>
Cc: <mingo@redhat.com>, <konrad.wilk@oracle.com>, <dwmw@amazon.co.uk>,
<tglx@linutronix.de>,
Srinivas REDDY Eeda <srinivas.eeda@oracle.com>, <bp@suse.de>,
<peterz@infradead.org>, <hpa@zytor.com>
Subject: [PATCH 2/3] retpolines: Remove the minimal stuff of retpoline support
Date: Mon, 29 Oct 2018 23:55:06 -0700 (PDT) [thread overview]
Message-ID: <dd9fce0a-e7e8-427b-bd11-7ec65ddb2ea7@default> (raw)
Now that CONFIG_RETPOLINE hard depends on compiler support, there is no
reason for minimal stuff to still exist.
This change is based on suggestion in https://lkml.org/lkml/2018/9/18/1016
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
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
reply other threads:[~2018-10-30 6:55 UTC|newest]
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