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| author | Breno Leitao <leitao@debian.org> | 2024-07-29 18:40:56 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-07-30 14:51:11 +0200 |
| commit | 72c70f480a70695523f984651d5da766b862c712 (patch) | |
| tree | 377d301e66d99db4c609812eb9e4b129b31748ee /arch/x86/kernel/cpu/bugs.c | |
| parent | x86/bugs: Add a separate config for SRBDS (diff) | |
| download | linux-72c70f480a70695523f984651d5da766b862c712.tar.xz linux-72c70f480a70695523f984651d5da766b862c712.zip | |
x86/bugs: Add a separate config for Spectre V2
Currently, the CONFIG_SPECULATION_MITIGATIONS is halfway populated,
where some mitigations have entries in Kconfig, and they could be
modified, while others mitigations do not have Kconfig entries, and
could not be controlled at build time.
Create an entry for the Spectre V2 CPU mitigation under
CONFIG_SPECULATION_MITIGATIONS. This allow users to enable or disable
it at compilation time.
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20240729164105.554296-9-leitao@debian.org
Diffstat (limited to 'arch/x86/kernel/cpu/bugs.c')
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 8292a96d376c..45cbc6f994ca 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1452,17 +1452,18 @@ static void __init spec_v2_print_cond(const char *reason, bool secure) static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void) { - enum spectre_v2_mitigation_cmd cmd = SPECTRE_V2_CMD_AUTO; + enum spectre_v2_mitigation_cmd cmd; char arg[20]; int ret, i; + cmd = IS_ENABLED(CONFIG_MITIGATION_SPECTRE_V2) ? SPECTRE_V2_CMD_AUTO : SPECTRE_V2_CMD_NONE; if (cmdline_find_option_bool(boot_command_line, "nospectre_v2") || cpu_mitigations_off()) return SPECTRE_V2_CMD_NONE; ret = cmdline_find_option(boot_command_line, "spectre_v2", arg, sizeof(arg)); if (ret < 0) - return SPECTRE_V2_CMD_AUTO; + return cmd; for (i = 0; i < ARRAY_SIZE(mitigation_options); i++) { if (!match_option(arg, ret, mitigation_options[i].option)) @@ -1472,8 +1473,8 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void) } if (i >= ARRAY_SIZE(mitigation_options)) { - pr_err("unknown option (%s). Switching to AUTO select\n", arg); - return SPECTRE_V2_CMD_AUTO; + pr_err("unknown option (%s). Switching to default mode\n", arg); + return cmd; } if ((cmd == SPECTRE_V2_CMD_RETPOLINE || |