linux-kernel - [RFC PATCH v2 1/6] x86/sev: add SVSM call macros for the vTPM protocol

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Message-ID: <20250228170720.144739-2-sgarzare@redhat.com>
Date: Fri, 28 Feb 2025 18:07:15 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Claudio Carvalho <cclaudio@...ux.ibm.com>,
	Peter Huewe <peterhuewe@....de>,
	x86@...nel.org,
	Dov Murik <dovmurik@...ux.ibm.com>,
	linux-coco@...ts.linux.dev,
	Dionna Glaze <dionnaglaze@...gle.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Ingo Molnar <mingo@...hat.com>,
	Joerg Roedel <jroedel@...e.de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	linux-integrity@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stefano Garzarella <sgarzare@...hat.com>
Subject: [RFC PATCH v2 1/6] x86/sev: add SVSM call macros for the vTPM protocol

Add macros for SVSM_VTPM_QUERY and SVSM_VTPM_CMD calls as defined
in the "Secure VM Service Module for SEV-SNP Guests"
Publication # 58019 Revision: 1.00

Link: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/58019.pdf
Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 arch/x86/include/asm/sev.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
index 1581246491b5..f6ebf4492606 100644
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -384,6 +384,10 @@ struct svsm_call {
 #define SVSM_ATTEST_SERVICES		0
 #define SVSM_ATTEST_SINGLE_SERVICE	1
 
+#define SVSM_VTPM_CALL(x)		((2ULL << 32) | (x))
+#define SVSM_VTPM_QUERY			0
+#define SVSM_VTPM_CMD			1
+
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 
 extern u8 snp_vmpl;
-- 
2.48.1