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[79.46.200.29]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e5c7472169sm8085277a12.24.2025.03.11.02.42.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Mar 2025 02:42:36 -0700 (PDT) From: Stefano Garzarella To: Jarkko Sakkinen Cc: Peter Huewe , Tom Lendacky , Jason Gunthorpe , x86@kernel.org, linux-kernel@vger.kernel.org, Borislav Petkov , linux-integrity@vger.kernel.org, Dov Murik , Dionna Glaze , linux-coco@lists.linux.dev, James Bottomley , Claudio Carvalho , Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner , Dave Hansen , Joerg Roedel , Stefano Garzarella Subject: [PATCH v3 1/4] x86/sev: add SVSM vTPM probe/send_command functions Date: Tue, 11 Mar 2025 10:42:22 +0100 Message-ID: <20250311094225.35129-2-sgarzare@redhat.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250311094225.35129-1-sgarzare@redhat.com> References: <20250311094225.35129-1-sgarzare@redhat.com> Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add two new functions to probe and send commands to the SVSM vTPM. They leverage the two calls defined by the AMD SVSM specification [1] for the vTPM protocol: SVSM_VTPM_QUERY and SVSM_VTPM_CMD. Expose these functions to be used by other modules such as a tpm driver. [1] "Secure VM Service Module for SEV-SNP Guests" Publication # 58019 Revision: 1.00 Co-developed-by: James Bottomley Signed-off-by: James Bottomley Co-developed-by: Claudio Carvalho Signed-off-by: Claudio Carvalho Signed-off-by: Stefano Garzarella --- v3: - removed link to the spec because those URLs are unstable [Borislav] - squashed "x86/sev: add SVSM call macros for the vTPM protocol" patch in this one [Borislav] - slimmed down snp_svsm_vtpm_probe() [Borislav] - removed features check and any print related [Tom] --- arch/x86/include/asm/sev.h | 7 +++++++ arch/x86/coco/sev/core.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index ba7999f66abe..09471d058ce5 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; @@ -481,6 +485,9 @@ void snp_msg_free(struct snp_msg_desc *mdesc); int snp_send_guest_request(struct snp_msg_desc *mdesc, struct snp_guest_req *req, struct snp_guest_request_ioctl *rio); +bool snp_svsm_vtpm_probe(void); +int snp_svsm_vtpm_send_command(u8 *buffer); + void __init snp_secure_tsc_prepare(void); void __init snp_secure_tsc_init(void); diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c index 96c7bc698e6b..2166bdff88b7 100644 --- a/arch/x86/coco/sev/core.c +++ b/arch/x86/coco/sev/core.c @@ -2628,6 +2628,37 @@ static int snp_issue_guest_request(struct snp_guest_req *req, struct snp_req_dat return ret; } +bool snp_svsm_vtpm_probe(void) +{ + struct svsm_call call = {}; + + /* The vTPM device is available only if a SVSM is present */ + if (!snp_vmpl) + return false; + + call.caa = svsm_get_caa(); + call.rax = SVSM_VTPM_CALL(SVSM_VTPM_QUERY); + + if (svsm_perform_call_protocol(&call)) + return false; + + /* Check platform commands contains TPM_SEND_COMMAND - platform command 8 */ + return (call.rcx_out & BIT_ULL(8)) == BIT_ULL(8); +} +EXPORT_SYMBOL_GPL(snp_svsm_vtpm_probe); + +int snp_svsm_vtpm_send_command(u8 *buffer) +{ + struct svsm_call call = {}; + + call.caa = svsm_get_caa(); + call.rax = SVSM_VTPM_CALL(SVSM_VTPM_CMD); + call.rcx = __pa(buffer); + + return svsm_perform_call_protocol(&call); +} +EXPORT_SYMBOL_GPL(snp_svsm_vtpm_send_command); + static struct platform_device sev_guest_device = { .name = "sev-guest", .id = -1,