[PATCH RFC 2/7] x86: cpu: modify boot_command_line to saved_command_line

[Mihai Carabas]

as boot_command_line has the __initdata attribute and cannot be
used after booting the kernel. command_line evaluation needs to
be used on microcode late loading in order to enforce the proper
mitigations for different CPU bugs.

Signed-off-by: Mihai Carabas <mihai.cara...@oracle.com>
---
 arch/x86/kernel/cpu/bugs.c | 11 ++++++-----
 arch/x86/kernel/cpu/tsx.c  |  2 +-
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 7091947..1760598 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -684,7 +684,7 @@ static void spec_v2_user_print_cond(const char *reason, 
bool secure)
                break;
        }
 
-       ret = cmdline_find_option(boot_command_line, "spectre_v2_user",
+       ret = cmdline_find_option(saved_command_line, "spectre_v2_user",
                                  arg, sizeof(arg));
        if (ret < 0)
                return SPECTRE_V2_USER_CMD_AUTO;
@@ -822,11 +822,12 @@ static enum spectre_v2_mitigation_cmd 
spectre_v2_parse_cmdline(void)
        char arg[20];
        int ret, i;
 
-       if (cmdline_find_option_bool(boot_command_line, "nospectre_v2") ||
+       if (cmdline_find_option_bool(saved_command_line, "nospectre_v2") ||
            cpu_mitigations_off())
                return SPECTRE_V2_CMD_NONE;
 
-       ret = cmdline_find_option(boot_command_line, "spectre_v2", arg, 
sizeof(arg));
+       ret = cmdline_find_option(saved_command_line, "spectre_v2", arg,
+           sizeof(arg));
        if (ret < 0)
                return SPECTRE_V2_CMD_AUTO;
 
@@ -1096,11 +1097,11 @@ static enum ssb_mitigation_cmd ssb_parse_cmdline(void)
        char arg[20];
        int ret, i;
 
-       if (cmdline_find_option_bool(boot_command_line, 
"nospec_store_bypass_disable") ||
+       if (cmdline_find_option_bool(saved_command_line, 
"nospec_store_bypass_disable") ||
            cpu_mitigations_off()) {
                return SPEC_STORE_BYPASS_CMD_NONE;
        } else {
-               ret = cmdline_find_option(boot_command_line, 
"spec_store_bypass_disable",
+               ret = cmdline_find_option(saved_command_line, 
"spec_store_bypass_disable",
                                          arg, sizeof(arg));
                if (ret < 0)
                        return SPEC_STORE_BYPASS_CMD_AUTO;
diff --git a/arch/x86/kernel/cpu/tsx.c b/arch/x86/kernel/cpu/tsx.c
index 7c46581..436fa93 100644
--- a/arch/x86/kernel/cpu/tsx.c
+++ b/arch/x86/kernel/cpu/tsx.c
@@ -92,7 +92,7 @@ void tsx_init(void)
        if (!tsx_ctrl_is_supported())
                return;
 
-       ret = cmdline_find_option(boot_command_line, "tsx", arg, sizeof(arg));
+       ret = cmdline_find_option(saved_command_line, "tsx", arg, sizeof(arg));
        if (ret >= 0) {
                if (!strcmp(arg, "on")) {
                        tsx_ctrl_state = TSX_CTRL_ENABLE;
-- 
1.8.3.1