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From: Joerg Roedel <joro@8bytes.org>
To: x86@kernel.org
Cc: Joerg Roedel <joro@8bytes.org>, Joerg Roedel <jroedel@suse.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Kees Cook <keescook@chromium.org>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Martin Radev <martin.b.radev@gmail.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 1/5] x86/boot/compressed/64: Introduce sev_status
Date: Mon, 19 Oct 2020 17:11:17 +0200	[thread overview]
Message-ID: <20201019151121.826-2-joro@8bytes.org> (raw)
In-Reply-To: <20201019151121.826-1-joro@8bytes.org>

From: Joerg Roedel <jroedel@suse.de>

Introduce sev_status and initialize it together with sme_me_mask to have
an indicator which SEV features are enabled.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/boot/compressed/mem_encrypt.S | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/mem_encrypt.S b/arch/x86/boot/compressed/mem_encrypt.S
index dd07e7b41b11..0effd58f0095 100644
--- a/arch/x86/boot/compressed/mem_encrypt.S
+++ b/arch/x86/boot/compressed/mem_encrypt.S
@@ -71,6 +71,8 @@ SYM_FUNC_END(get_sev_encryption_bit)
 SYM_FUNC_START(set_sev_encryption_mask)
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 	push	%rbp
+	push	%rax
+	push	%rcx
 	push	%rdx
 
 	movq	%rsp, %rbp		/* Save current stack pointer */
@@ -81,10 +83,19 @@ SYM_FUNC_START(set_sev_encryption_mask)
 
 	bts	%rax, sme_me_mask(%rip)	/* Create the encryption mask */
 
+	/* Read sev_status */
+	movl	$MSR_AMD64_SEV, %ecx
+	rdmsr
+	shlq	$32, %rdx
+	orq	%rdx, %rax
+	movq	%rax, sev_status(%rip)
+
 .Lno_sev_mask:
 	movq	%rbp, %rsp		/* Restore original stack pointer */
 
 	pop	%rdx
+	pop	%rcx
+	pop	%rax
 	pop	%rbp
 #endif
 
@@ -96,5 +107,6 @@ SYM_FUNC_END(set_sev_encryption_mask)
 
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 	.balign	8
-SYM_DATA(sme_me_mask, .quad 0)
+SYM_DATA(sme_me_mask,		.quad 0)
+SYM_DATA(sev_status,		.quad 0)
 #endif
-- 
2.28.0


  reply	other threads:[~2020-10-19 15:11 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-19 15:11 [PATCH 0/5] x86/sev-es: Mitigate some HV attack vectors Joerg Roedel
2020-10-19 15:11 ` Joerg Roedel [this message]
2020-10-20  0:59   ` [PATCH 1/5] x86/boot/compressed/64: Introduce sev_status Sean Christopherson
2020-10-20  1:08     ` Sean Christopherson
2020-10-20  9:55     ` Joerg Roedel
2020-10-19 15:11 ` [PATCH 2/5] x86/boot/compressed/64: Add CPUID sanity check to early #VC handler Joerg Roedel
2020-10-19 15:11 ` [PATCH 3/5] x86/boot/compressed/64: Check SEV encryption in 64-bit boot-path Joerg Roedel
2020-10-19 17:00   ` Arvind Sankar
2020-10-19 17:54     ` Arvind Sankar
2020-10-19 20:39       ` Joerg Roedel
2020-10-19 21:31         ` Arvind Sankar
2020-10-20  8:59           ` Joerg Roedel
2020-10-20 14:33             ` Arvind Sankar
2020-10-20 15:44               ` Joerg Roedel
2020-10-19 20:33     ` Joerg Roedel
2020-10-19 21:22       ` Arvind Sankar
2020-10-20  9:41         ` Joerg Roedel
2020-10-19 15:11 ` [PATCH 4/5] x86/head/64: Check SEV encryption before switching to kernel page-table Joerg Roedel
2020-10-19 15:11 ` [PATCH 5/5] x86/sev-es: Do not support MMIO to/from encrypted memory Joerg Roedel

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