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x86/retpoline: Remove minimal retpoline support 

Now that CONFIG_RETPOLINE hard depends on compiler support, there is no
reason to keep the minimal retpoline support around which only provided
basic protection in the assembly files.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Borislav Petkov <bp@suse.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <srinivas.eeda@oracle.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/f06f0a89-5587-45db-8ed2-0a9d6638d5c0@default
This commit is contained in:
Zhenzhong Duan 2018-11-02 01:45:41 -07:00 коммит произвёл Thomas Gleixner
Родитель 4cd24de3a0
Коммит ef014aae8f
2 изменённых файлов: 2 добавлений и 13 удалений
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2
arch/x86/include/asm/nospec-branch.h
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@ -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,

13
arch/x86/kernel/cpu/bugs.c
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@ -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 @@ retpoline_auto:
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);
}