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x86/boot/compressed/head_64.S: Clean up SEV-related comments

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Move the comment about setting the encryption mask above the line which
does that and, especially, inside the ifdeffery, where it belongs.

Move comments on top of the code lines they refer to and not on the
side, which impairs readability.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://patch.msgid.link/20260620043757.347076-1-bp@kernel.org
This commit is contained in:
Borislav Petkov (AMD) 2026-06-19 21:37:57 -07:00 committed by Ingo Molnar
parent db55777fec
commit 7bdcb5b3a9
1 changed files with 11 additions and 7 deletions
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18
arch/x86/boot/compressed/head_64.S
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@ -172,19 +172,23 @@ SYM_FUNC_START(startup_32)
/*
* Build early 4G boot pagetable
*/
/*
* If SEV is active then set the encryption mask in the page tables.
* This will ensure that when the kernel is copied and decompressed
* it will be done so encrypted.
*/
xorl %edx, %edx
#ifdef CONFIG_AMD_MEM_ENCRYPT
call get_sev_encryption_bit
xorl %edx, %edx
testl %eax, %eax
jz 1f
subl $32, %eax /* Encryption bit is always above bit 31 */
bts %eax, %edx /* Set encryption mask for page tables */
/* Encryption bit is always above bit 31 */
subl $32, %eax
/*
* If SEV is active then set the encryption mask in the page tables.
* This will ensure that when the kernel is copied and decompressed it
* will be done so encrypted.
*/
bts %eax, %edx
/*
* Set MSR_AMD64_SEV_ENABLED_BIT in sev_status so that
* startup32_check_sev_cbit() will do a check. sev_enable() will