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[87.12.25.55]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39c0b66363fsm11273542f8f.36.2025.03.31.03.39.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Mar 2025 03:39:22 -0700 (PDT) From: Stefano Garzarella To: Jarkko Sakkinen Cc: linux-kernel@vger.kernel.org, Jason Gunthorpe , James Bottomley , Dave Hansen , Borislav Petkov , linux-integrity@vger.kernel.org, Peter Huewe , Ingo Molnar , linux-coco@lists.linux.dev, Dov Murik , Thomas Gleixner , Joerg Roedel , x86@kernel.org, Dionna Glaze , Tom Lendacky , Claudio Carvalho , "H. Peter Anvin" , Stefano Garzarella Subject: [PATCH v5 4/4] x86/sev: register tpm-svsm platform device Date: Mon, 31 Mar 2025 12:38:57 +0200 Message-ID: <20250331103900.92701-5-sgarzare@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250331103900.92701-1-sgarzare@redhat.com> References: <20250331103900.92701-1-sgarzare@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Stefano Garzarella 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 Register the device unconditionally. The support check (e.g. SVSM, cmd) is in snp_svsm_vtpm_probe(), keeping all logic in one place. This function is called during the driver's probe along with other setup tasks like memory allocation. Signed-off-by: Stefano Garzarella Reviewed-by: Tom Lendacky --- v4: - explained better why we register it anyway in the commit message --- 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 efb43c9d3d30..acbd9bc526b1 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -2689,6 +2689,11 @@ static struct platform_device sev_guest_device =3D { .id =3D -1, }; =20 +static struct platform_device tpm_svsm_device =3D { + .name =3D "tpm-svsm", + .id =3D -1, +}; + static int __init snp_init_platform_device(void) { if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) @@ -2697,6 +2702,9 @@ static int __init snp_init_platform_device(void) if (platform_device_register(&sev_guest_device)) return -ENODEV; =20 + if (platform_device_register(&tpm_svsm_device)) + return -ENODEV; + pr_info("SNP guest platform device initialized.\n"); return 0; } --=20 2.49.0