linux-kernel - [PATCH v2 1/6] x86/boot: Move sanitize_boot

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Date:   Wed, 12 Apr 2023 14:44:57 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 1/6] x86/boot: Move sanitize_boot_params()

sanitize_boot_params() contains a static table that would need to be
addressed in a PIC manner if it were executed early in the boot process
while using the identity-mapped page tables.  Separate it from
copy_bootdata().

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/kernel/head64.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 387e4b12e823..4a3b195c9002 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -455,7 +455,6 @@ static void __init copy_bootdata(char *real_mode_data)
 	sme_map_bootdata(real_mode_data);
 
 	memcpy(&boot_params, real_mode_data, sizeof(boot_params));
-	sanitize_boot_params(&boot_params);
 	cmd_line_ptr = get_cmd_line_ptr();
 	if (cmd_line_ptr) {
 		command_line = __va(cmd_line_ptr);
@@ -543,6 +542,8 @@ void __init x86_64_start_reservations(char *real_mode_data)
 	if (!boot_params.hdr.version)
 		copy_bootdata(__va(real_mode_data));
 
+	sanitize_boot_params(&boot_params);
+
 	x86_early_init_platform_quirks();
 
 	switch (boot_params.hdr.hardware_subarch) {
-- 
2.39.2