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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/arch/x86/boot/compressed/mem_encrypt.S
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@@ -1,13 +1,10 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * AMD Memory Encryption Support
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  *
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  * Copyright (C) 2017 Advanced Micro Devices, Inc.
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  *
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  * Author: Tom Lendacky <thomas.lendacky@amd.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/linkage.h>
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@@ -18,19 +15,13 @@
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 	.text
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 	.code32
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-ENTRY(get_sev_encryption_bit)
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+SYM_FUNC_START(get_sev_encryption_bit)
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 	xor	%eax, %eax
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 #ifdef CONFIG_AMD_MEM_ENCRYPT
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 	push	%ebx
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 	push	%ecx
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 	push	%edx
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-
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-	/* Check if running under a hypervisor */
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-	movl	$1, %eax
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-	cpuid
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-	bt	$31, %ecx		/* Check the hypervisor bit */
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-	jnc	.Lno_sev
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 	movl	$0x80000000, %eax	/* CPUID to check the highest leaf */
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 	cpuid
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@@ -67,11 +58,14 @@
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 #endif	/* CONFIG_AMD_MEM_ENCRYPT */
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-	ret
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-ENDPROC(get_sev_encryption_bit)
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+	RET
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+SYM_FUNC_END(get_sev_encryption_bit)
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 	.code64
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-ENTRY(set_sev_encryption_mask)
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+
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+#include "../../kernel/sev_verify_cbit.S"
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+
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+SYM_FUNC_START(set_sev_encryption_mask)
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 #ifdef CONFIG_AMD_MEM_ENCRYPT
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 	push	%rbp
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 	push	%rdx
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@@ -84,6 +78,19 @@
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 	bts	%rax, sme_me_mask(%rip)	/* Create the encryption mask */
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+	/*
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+	 * Read MSR_AMD64_SEV again and store it to sev_status. Can't do this in
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+	 * get_sev_encryption_bit() because this function is 32-bit code and
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+	 * shared between 64-bit and 32-bit boot path.
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+	 */
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+	movl	$MSR_AMD64_SEV, %ecx	/* Read the SEV MSR */
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+	rdmsr
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+
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+	/* Store MSR value in sev_status */
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+	shlq	$32, %rdx
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+	orq	%rdx, %rax
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+	movq	%rax, sev_status(%rip)
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+
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 .Lno_sev_mask:
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 	movq	%rbp, %rsp		/* Restore original stack pointer */
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@@ -92,13 +99,14 @@
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 #endif
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 	xor	%rax, %rax
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-	ret
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-ENDPROC(set_sev_encryption_mask)
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+	RET
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+SYM_FUNC_END(set_sev_encryption_mask)
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 	.data
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 #ifdef CONFIG_AMD_MEM_ENCRYPT
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 	.balign	8
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-GLOBAL(sme_me_mask)
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-	.quad	0
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+SYM_DATA(sme_me_mask,		.quad 0)
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+SYM_DATA(sev_status,		.quad 0)
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+SYM_DATA(sev_check_data,	.quad 0)
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 #endif