x86/head/64: Don't call verify_cpu() on starting APs (3ecacdbd) · Commits · 戴 / test

arch/x86/include/asm/realmode.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -72,6 +72,7 @@ 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)

+12 −0

Original line number	Diff line number	Diff line
		@@ -125,6 +125,18 @@ SYM_CODE_START(secondary_startup_64)
		/* Sanitize CPU configuration */
		call verify_cpu

		/*
		* The secondary_startup_64_no_verify entry point is only used by
		* SEV-ES guests. In those guests the call to verify_cpu() would cause
		* #VC exceptions which can not be handled at this stage of secondary
		* CPU bringup.
		*
		* All non SEV-ES systems, especially Intel systems, need to execute
		* verify_cpu() above to make sure NX is enabled.
		*/
		SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
		UNWIND_HINT_EMPTY

		/*
		* Retrieve the modifier (SME encryption mask if SME is active) to be
		* added to the initial pgdir entry that will be programmed into CR3.

+6 −0

Original line number	Diff line number	Diff line
		@@ -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 get/update SEV-ES AP Jump Table");
		}