From nobody Sun Feb 8 13:32:26 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E096C278E68; Fri, 11 Apr 2025 10:15:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744366546; cv=none; b=cdEh+p6n8+lwoWpTlRAzsqM0A5aMKHwqT/rjCqVLbZ15doWofISAdJw+xAWjp/hFS7ZI3NHknlhbekLJfhwvbm+5y9aWFAti9bU29wwkigHstR8fGnfUaIvmDl3UljJeUgYXb+EZ0HX7UNzP0IkTbWfDIbnVM8keMQ3GCj9FAzc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744366546; c=relaxed/simple; bh=VfWfsCy2jSyheOfT9L1IDiw3j3bhdqaLXB0s6JA7GCI=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=CUFK1sHdKGiuEwzu9xcJdjAzb8dycMYF6j40x1V+oDXA9LUr2IPTxpNhOZt/KUHpzP4MizA2SCQn0ZAw4GJXLjtXzeJpIMP8LoRFU7899LPZDu76g5AB+s5y2A3CiC0cb11jSJBAbKPSXFnnTvQIuEYNs5cGqyUjVqORnfo+UII= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=UZC21FLZ; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=wXSHxwGu; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="UZC21FLZ"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="wXSHxwGu" Date: Fri, 11 Apr 2025 10:15:42 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1744366543; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=h72aED5xghVW9dVLr0BWESKFgrmGfSo5qd1eS/uSqKg=; b=UZC21FLZGUnWyWAy9ovqYOO8FNGRuTfWqCEERvqm5IIfUaCKku5wRaXauySbtlibKeM8SE CTVhoS+Bzs37AGAeKRhBh5u9tSLBB3fKzK8AmD9dyzmaNPXR3uzw62+8Io+2ACCSbWZ0++ PftuofCSCj5OyjG2nCrdYDiGm0RaqsI4X3bjAndcet00Ssfdp57VlptFHuEIijb0V7XwBS VWoIV/NJS9degxsksJMjgBk3l0llOLov0DIEwnQ+zECVzQs2TCHBoIaNvKpSgDOo/QSKrF qCRjgAjkqtl10XeliAZDNj/xiAYtVAVyXcTjKwdUncZfSHgX8TJEaPhuq3AN3w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1744366543; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=h72aED5xghVW9dVLr0BWESKFgrmGfSo5qd1eS/uSqKg=; b=wXSHxwGuMqO2jm0uBaNW9kPqq5r5m/awsCPV90g71+KXwX8d2XAWX7NIHqac2o5mN0YpIe Zi2rCEso+y6VmxCQ== From: "tip-bot2 for Stefano Garzarella" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/sev] svsm: Add header with SVSM_VTPM_CMD helpers Cc: James Bottomley , Claudio Carvalho , Stefano Garzarella , "Borislav Petkov (AMD)" , Jarkko Sakkinen , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20250403100943.120738-3-sgarzare@redhat.com> References: <20250403100943.120738-3-sgarzare@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <174436654254.31282.1735564500644332385.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/sev branch of tip: Commit-ID: b2849b0723668ae3e0739b2c9c066eafe8bc0961 Gitweb: https://git.kernel.org/tip/b2849b0723668ae3e0739b2c9c066eafe= 8bc0961 Author: Stefano Garzarella AuthorDate: Thu, 03 Apr 2025 12:09:40 +02:00 Committer: Borislav Petkov (AMD) CommitterDate: Thu, 10 Apr 2025 16:20:06 +02:00 svsm: Add header with SVSM_VTPM_CMD helpers Add helpers for the SVSM_VTPM_CMD calls used by the vTPM protocol defined by the AMD SVSM spec [1]. The vTPM protocol follows the Official TPM 2.0 Reference Implementation (originally by Microsoft, now part of the TCG) simulator protocol. [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 Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Jarkko Sakkinen Link: https://lore.kernel.org/r/20250403100943.120738-3-sgarzare@redhat.com --- include/linux/tpm_svsm.h | 149 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 149 insertions(+) create mode 100644 include/linux/tpm_svsm.h diff --git a/include/linux/tpm_svsm.h b/include/linux/tpm_svsm.h new file mode 100644 index 0000000..38e341f --- /dev/null +++ b/include/linux/tpm_svsm.h @@ -0,0 +1,149 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 James.Bottomley@HansenPartnership.com + * Copyright (C) 2025 Red Hat, Inc. All Rights Reserved. + * + * Helpers for the SVSM_VTPM_CMD calls used by the vTPM protocol defined b= y the + * AMD SVSM spec [1]. + * + * The vTPM protocol follows the Official TPM 2.0 Reference Implementation + * (originally by Microsoft, now part of the TCG) simulator protocol. + * + * [1] "Secure VM Service Module for SEV-SNP Guests" + * Publication # 58019 Revision: 1.00 + */ +#ifndef _TPM_SVSM_H_ +#define _TPM_SVSM_H_ + +#include +#include +#include + +#define SVSM_VTPM_MAX_BUFFER 4096 /* max req/resp buffer size */ + +/** + * struct svsm_vtpm_request - Generic request for single word command + * @cmd: The command to send + * + * Defined by AMD SVSM spec [1] in section "8.2 SVSM_VTPM_CMD Call" - + * Table 15: vTPM Common Request/Response Structure + * Byte Size =C2=A0=C2=A0 =C2=A0In/Out=C2=A0=C2=A0=C2=A0=C2=A0D= escription + * Offset=C2=A0=C2=A0=C2=A0=C2=A0(Bytes) + * 0x000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0In=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0Platform command +=C2=A0*=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0Out=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Platform command respons= e size + */ +struct svsm_vtpm_request { + u32 cmd; +}; + +/** + * struct svsm_vtpm_response - Generic response + * @size: The response size (zero if nothing follows) + * + * Defined by AMD SVSM spec [1] in section "8.2 SVSM_VTPM_CMD Call" - + * Table 15: vTPM Common Request/Response Structure + * Byte Size =C2=A0=C2=A0 =C2=A0In/Out=C2=A0=C2=A0=C2=A0=C2=A0D= escription + * Offset=C2=A0=C2=A0=C2=A0=C2=A0(Bytes) + * 0x000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0In=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0Platform command +=C2=A0*=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0Out=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Platform command respons= e size + * + * Note: most TCG Simulator commands simply return zero here with no indic= ation + * of success or failure. + */ +struct svsm_vtpm_response { + u32 size; +}; + +/** + * struct svsm_vtpm_cmd_request - Structure for a TPM_SEND_COMMAND request + * @cmd: The command to send (must be TPM_SEND_COMMAND) + * @locality: The locality + * @buf_size: The size of the input buffer following + * @buf: A buffer of size buf_size + * + * Defined by AMD SVSM spec [1] in section "8.2 SVSM_VTPM_CMD Call" - + * Table 16: TPM_SEND_COMMAND Request Structure + * Byte Size Meaning + * Offset=C2=A0=C2=A0=C2=A0=C2=A0(Bytes) + * 0x000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Platform command (8) + * 0x004=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Locality (must-be-0) + * 0x005=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0TPM Command size (in bytes) + * 0x009=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Variable=C2=A0=C2=A0=C2=A0TPM Co= mmand + * + * Note: the TCG Simulator expects @buf_size to be equal to the size of the + * specific TPM command, otherwise an TPM_RC_COMMAND_SIZE error is returne= d. + */ +struct svsm_vtpm_cmd_request { + u32 cmd; + u8 locality; + u32 buf_size; + u8 buf[]; +} __packed; + +/** + * struct svsm_vtpm_cmd_response - Structure for a TPM_SEND_COMMAND respon= se + * @buf_size: The size of the output buffer following + * @buf: A buffer of size buf_size + * + * Defined by AMD SVSM spec [1] in section "8.2 SVSM_VTPM_CMD Call" - + * Table 17: TPM_SEND_COMMAND Response Structure + * Byte Size Meaning + * Offset=C2=A0=C2=A0=C2=A0=C2=A0(Bytes) + * 0x000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A04=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Response size (in bytes) + * 0x004=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Variable=C2=A0=C2=A0=C2=A0Respon= se + */ +struct svsm_vtpm_cmd_response { + u32 buf_size; + u8 buf[]; +}; + +/** + * svsm_vtpm_cmd_request_fill() - Fill a TPM_SEND_COMMAND request to be se= nt to SVSM + * @req: The struct svsm_vtpm_cmd_request to fill + * @locality: The locality + * @buf: The buffer from where to copy the payload of the command + * @len: The size of the buffer + * + * Return: 0 on success, negative error code on failure. + */ +static inline int +svsm_vtpm_cmd_request_fill(struct svsm_vtpm_cmd_request *req, u8 locality, + const u8 *buf, size_t len) +{ + if (len > SVSM_VTPM_MAX_BUFFER - sizeof(*req)) + return -EINVAL; + + req->cmd =3D 8; /* TPM_SEND_COMMAND */ + req->locality =3D locality; + req->buf_size =3D len; + + memcpy(req->buf, buf, len); + + return 0; +} + +/** + * svsm_vtpm_cmd_response_parse() - Parse a TPM_SEND_COMMAND response rece= ived from SVSM + * @resp: The struct svsm_vtpm_cmd_response to parse + * @buf: The buffer where to copy the response + * @len: The size of the buffer + * + * Return: buffer size filled with the response on success, negative error + * code on failure. + */ +static inline int +svsm_vtpm_cmd_response_parse(const struct svsm_vtpm_cmd_response *resp, u8= *buf, + size_t len) +{ + if (len < resp->buf_size) + return -E2BIG; + + if (resp->buf_size > SVSM_VTPM_MAX_BUFFER - sizeof(*resp)) + return -EINVAL; // Invalid response from the platform TPM + + memcpy(buf, resp->buf, resp->buf_size); + + return resp->buf_size; +} + +#endif /* _TPM_SVSM_H_ */