[PATCH v4 70/75] x86/head/64: Don't call verify_cpu() on starting APs

Joerg Roedel
Tue, 14 Jul 2020 12:09:12 -0000

The APs are not ready to handle exceptions when verify_cpu() is called
in secondary_startup_64.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
---
 arch/x86/include/asm/realmode.h | 1 +
 arch/x86/kernel/head_64.S       | 1 +
 arch/x86/realmode/init.c        | 6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/realmode.h b/arch/x86/include/asm/realmode.h
index 6590394af309..5c97807c38a4 100644
--- a/arch/x86/include/asm/realmode.h
+++ b/arch/x86/include/asm/realmode.h
@@ -69,6 +69,7 @@ extern unsigned char startup_32_smp[];
 extern unsigned char boot_gdt[];
 #else
 extern unsigned char secondary_startup_64[];
+extern unsigned char secondary_startup_64_no_verify[];
 #endif

 static inline size_t real_mode_size_needed(void)
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 5b577d6bce7a..8b43ed0592e8 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -165,6 +165,7 @@ SYM_CODE_START(secondary_startup_64)
 	/* Sanitize CPU configuration */
 	call verify_cpu

+SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
 	/*
 	 * Retrieve the modifier (SME encryption mask if SME is active) to be
 	 * added to the initial pgdir entry that will be programmed into CR3.
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 61a52b925d15..df701f87ddef 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -46,6 +46,12 @@ static void sme_sev_setup_real_mode(struct trampoline_header
*th)
 		th->flags |= TH_FLAGS_SME_ACTIVE;

 	if (sev_es_active()) {
+		/*
+		 * Skip the call to verify_cpu() in secondary_startup_64 as it
+		 * will cause #VC exceptions when the AP can't handle them yet.
+		 */
+		th->start = (u64) secondary_startup_64_no_verify;
+
 		if (sev_es_setup_ap_jump_table(real_mode_header))
 			panic("Failed to update SEV-ES AP Jump Table");
 	}
--
2.27.0