4 files changed, 15 insertions, 10 deletions
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index 148ba5c5106e..0f24f7ebec9b 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -305,7 +305,6 @@ void initregs(struct biosregs *regs);
 int strcmp(const char *str1, const char *str2);
 int strncmp(const char *cs, const char *ct, size_t count);
 size_t strnlen(const char *s, size_t maxlen);
-unsigned int atou(const char *s);
 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);
 size_t strlen(const char *s);
 char *strchr(const char *s, int c);
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 04a35b2c26e9..0d37420cad02 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -385,6 +385,19 @@ static void parse_mem_encrypt(struct setup_header *hdr)
 		hdr->xloadflags |= XLF_MEM_ENCRYPTION;
 }
 
+static void early_sev_detect(void)
+{
+	/*
+	 * Accessing video memory causes guest termination because
+	 * the boot stage2 #VC handler of SEV-ES/SNP guests does not
+	 * support MMIO handling and kexec -c adds screen_info to the
+	 * boot parameters passed to the kexec kernel, which causes
+	 * console output to be dumped to both video and serial.
+	 */
+	if (sev_status & MSR_AMD64_SEV_ES_ENABLED)
+		lines = cols = 0;
+}
+
 /*
  * The compressed kernel image (ZO), has been moved so that its position
  * is against the end of the buffer used to hold the uncompressed kernel
@@ -440,6 +453,8 @@ asmlinkage __visible void *extract_kernel(void *rmode, unsigned char *output)
 	 */
 	early_tdx_detect();
 
+	early_sev_detect();
+
 	console_init();
 
 	/*
diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c
index c23f3b9c84fe..84f7a883ce1e 100644
--- a/arch/x86/boot/string.c
+++ b/arch/x86/boot/string.c
@@ -88,14 +88,6 @@ size_t strnlen(const char *s, size_t maxlen)
 	return (es - s);
 }
 
-unsigned int atou(const char *s)
-{
-	unsigned int i = 0;
-	while (isdigit(*s))
-		i = i * 10 + (*s++ - '0');
-	return i;
-}
-
 /* Works only for digits and letters, but small and fast */
 #define TOLOWER(x) ((x) | 0x20)
 
diff --git a/arch/x86/boot/string.h b/arch/x86/boot/string.h
index e5d2c6b8c2f1..a5b05ebc037d 100644
--- a/arch/x86/boot/string.h
+++ b/arch/x86/boot/string.h
@@ -24,7 +24,6 @@ extern size_t strlen(const char *s);
 extern char *strstr(const char *s1, const char *s2);
 extern char *strchr(const char *s, int c);
 extern size_t strnlen(const char *s, size_t maxlen);
-extern unsigned int atou(const char *s);
 extern unsigned long long simple_strtoull(const char *cp, char **endp,
 					  unsigned int base);
 long simple_strtol(const char *cp, char **endp, unsigned int base);