linux-kernel - [RFC PATCH v2 6/6] x86/sev: register tpm-svsm platform device

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Message-ID: <20250228170720.144739-7-sgarzare@redhat.com>
Date: Fri, 28 Feb 2025 18:07:20 +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 6/6] x86/sev: register tpm-svsm platform device

SNP platform can provide a vTPM device emulated by SVSM.

The "tpm-svsm" device can be handled by the platform driver added
by the previous commit in drivers/char/tpm/tpm_svsm.c

The driver will call snp_svsm_vtpm_probe() to check if SVSM is
present and if it's support the vTPM protocol.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 arch/x86/coco/sev/core.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index 4158e447d645..7e91fae7d43a 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -2680,6 +2680,11 @@ static struct platform_device sev_guest_device = {
 	.id		= -1,
 };
 
+static struct platform_device tpm_svsm_device = {
+	.name		= "tpm-svsm",
+	.id		= -1,
+};
+
 static int __init snp_init_platform_device(void)
 {
 	if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
@@ -2688,6 +2693,9 @@ static int __init snp_init_platform_device(void)
 	if (platform_device_register(&sev_guest_device))
 		return -ENODEV;
 
+	if (platform_device_register(&tpm_svsm_device))
+		return -ENODEV;
+
 	pr_info("SNP guest platform device initialized.\n");
 	return 0;
 }
-- 
2.48.1