x86/boot/compressed/64: Introduce sev_status (3ad84246) · Commits · 戴 / test

Introduce sev_status and initialize it together with sme_me_mask to have an indicator which SEV features are enabled. Signed-off-by:

arch/x86/boot/compressed/mem_encrypt.S

+15 −1

Original line number	Diff line number	Diff line
		@@ -81,6 +81,19 @@ SYM_FUNC_START(set_sev_encryption_mask)

		bts %rax, sme_me_mask(%rip) /* Create the encryption mask */

		/*
		* Read MSR_AMD64_SEV again and store it to sev_status. Can't do this in
		* get_sev_encryption_bit() because this function is 32-bit code and
		* shared between 64-bit and 32-bit boot path.
		*/
		movl $MSR_AMD64_SEV, %ecx /* Read the SEV MSR */
		rdmsr

		/* Store MSR value in sev_status */
		shlq $32, %rdx
		orq %rdx, %rax
		movq %rax, sev_status(%rip)

		.Lno_sev_mask:
		movq %rbp, %rsp /* Restore original stack pointer */

		@@ -97,4 +110,5 @@ SYM_FUNC_END(set_sev_encryption_mask)
		#ifdef CONFIG_AMD_MEM_ENCRYPT
		.balign 8
		SYM_DATA(sme_me_mask, .quad 0)
		SYM_DATA(sev_status, .quad 0)
		#endif