Commit e396dd85 authored by Stefano Garzarella's avatar Stefano Garzarella Committed by Borislav Petkov (AMD)
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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 registered by the
x86/sev core code.

Register the platform device only when SVSM is available and it supports vTPM
commands as checked by snp_svsm_vtpm_probe().

  [ bp: Massage commit message. ]

Signed-off-by: default avatarStefano Garzarella <sgarzare@redhat.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20250410135118.133240-5-sgarzare@redhat.com
parent 93b7c6b3

arch/x86/coco/sev/core.c

+10 −1
Original line number Diff line number Diff line
@@ -2688,6 +2688,11 @@ 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))
@@ -2696,7 +2701,11 @@ static int __init snp_init_platform_device(void) 
	if (platform_device_register(&sev_guest_device))

		return -ENODEV;



	pr_info("SNP guest platform device initialized.\n");

	if (snp_svsm_vtpm_probe() &&

	    platform_device_register(&tpm_svsm_device))

		return -ENODEV;



	pr_info("SNP guest platform devices initialized.\n");

	return 0;

}

device_initcall(snp_init_platform_device);