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[87.12.25.55]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d4fd9e96bsm118452815e9.25.2025.03.24.03.47.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Mar 2025 03:47:15 -0700 (PDT) From: Stefano Garzarella To: Jarkko Sakkinen Cc: Joerg Roedel , Ingo Molnar , Dave Hansen , Peter Huewe , Tom Lendacky , Thomas Gleixner , x86@kernel.org, James Bottomley , linux-kernel@vger.kernel.org, Borislav Petkov , Jason Gunthorpe , "H. Peter Anvin" , linux-coco@lists.linux.dev, Claudio Carvalho , Dov Murik , Dionna Glaze , linux-integrity@vger.kernel.org, Stefano Garzarella Subject: [PATCH v4 4/4] x86/sev: register tpm-svsm platform device Date: Mon, 24 Mar 2025 11:46:49 +0100 Message-ID: <20250324104653.138663-5-sgarzare@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250324104653.138663-1-sgarzare@redhat.com> References: <20250324104653.138663-1-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 --- 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 034aab7e76d2..0abcac87af89 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -2692,6 +2692,11 @@ 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)) @@ -2700,6 +2705,9 @@ 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