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 v2 1/5] x86/boot/compressed/64: Introduce sev_status
Date: Tue, 20 Oct 2020 14:18:52 +0200 [thread overview]
Message-ID: <20201020121856.19427-2-joro@8bytes.org> (raw)
In-Reply-To: <20201020121856.19427-1-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 | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/mem_encrypt.S b/arch/x86/boot/compressed/mem_encrypt.S
index dd07e7b41b11..2192b3bd78d8 100644
--- a/arch/x86/boot/compressed/mem_encrypt.S
+++ b/arch/x86/boot/compressed/mem_encrypt.S
@@ -81,6 +81,13 @@ 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 */
@@ -96,5 +103,6 @@ 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
next prev parent reply other threads:[~2020-10-20 12:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-20 12:18 [PATCH v2 0/5] x86/sev-es: Mitigate some HV attack vectors Joerg Roedel
2020-10-20 12:18 ` Joerg Roedel [this message]
2020-10-20 12:18 ` [PATCH v2 2/5] x86/boot/compressed/64: Add CPUID sanity check to early #VC handler Joerg Roedel
2020-10-20 12:18 ` [PATCH v2 3/5] x86/boot/compressed/64: Check SEV encryption in 64-bit boot-path Joerg Roedel
2020-10-20 14:12 ` Arvind Sankar
2020-10-20 15:48 ` Joerg Roedel
2020-10-20 16:04 ` Arvind Sankar
2020-10-21 12:49 ` Joerg Roedel
2020-10-20 12:18 ` [PATCH v2 4/5] x86/head/64: Check SEV encryption before switching to kernel page-table Joerg Roedel
2020-10-20 12:18 ` [PATCH v2 5/5] x86/sev-es: Do not support MMIO to/from encrypted memory Joerg Roedel
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