From patchwork Thu Feb 27 13:44:06 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roy Hopkins X-Patchwork-Id: 13994550 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0E358C1B0FF for ; Thu, 27 Feb 2025 13:58:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tnePE-0003tX-QK; Thu, 27 Feb 2025 08:58:30 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tneCB-00082L-94 for qemu-devel@nongnu.org; Thu, 27 Feb 2025 08:44:59 -0500 Received: from smtp-out-60.livemail.co.uk ([213.171.216.60] helo=smtp.livemail.co.uk) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tneC9-0005P2-0y for qemu-devel@nongnu.org; Thu, 27 Feb 2025 08:44:58 -0500 Received: from localhost.localdomain (unknown [145.40.191.116]) (Authenticated sender: roy.hopkins@randomman.co.uk) by smtp.livemail.co.uk (Postfix) with ESMTPSA id 8AE2240534; Thu, 27 Feb 2025 13:44:48 +0000 (GMT) From: Roy Hopkins To: qemu-devel@nongnu.org Cc: Roy Hopkins , Paolo Bonzini , "Daniel P . Berrange" , Stefano Garzarella , Marcelo Tosatti , "Michael S . Tsirkin" , Cornelia Huck , Marcel Apfelbaum , Sergio Lopez , Eduardo Habkost , Alistair Francis , Peter Xu , David Hildenbrand , Igor Mammedov , Tom Lendacky , Michael Roth , Ani Sinha , Joerg Roedel Subject: [PATCH v7 02/16] backends/confidential-guest-support: Add functions to support IGVM Date: Thu, 27 Feb 2025 13:44:06 +0000 Message-ID: <39f9200d46dcea7cb246d720a806512febb72407.1740663410.git.roy.hopkins@randomman.co.uk> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: none client-ip=213.171.216.60; envelope-from=roy.hopkins@randomman.co.uk; helo=smtp.livemail.co.uk X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Thu, 27 Feb 2025 08:58:26 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org In preparation for supporting the processing of IGVM files to configure guests, this adds a set of functions to ConfidentialGuestSupport allowing configuration of secure virtual machines that can be implemented for each supported isolation platform type such as Intel TDX or AMD SEV-SNP. These functions will be called by IGVM processing code in subsequent patches. This commit provides a default implementation of the functions that either perform no action or generate an error when they are called. Targets that support ConfidentalGuestSupport should override these implementations. Signed-off-by: Roy Hopkins Acked-by: Michael S. Tsirkin Reviewed-by: Stefano Garzarella --- backends/confidential-guest-support.c | 31 ++++++++++ include/system/confidential-guest-support.h | 67 +++++++++++++++++++++ 2 files changed, 98 insertions(+) diff --git a/backends/confidential-guest-support.c b/backends/confidential-guest-support.c index 1cd9bed505..ed1ff78b5c 100644 --- a/backends/confidential-guest-support.c +++ b/backends/confidential-guest-support.c @@ -14,14 +14,45 @@ #include "qemu/osdep.h" #include "system/confidential-guest-support.h" +#include "qapi/error.h" OBJECT_DEFINE_ABSTRACT_TYPE(ConfidentialGuestSupport, confidential_guest_support, CONFIDENTIAL_GUEST_SUPPORT, OBJECT) +static bool check_support(ConfidentialGuestPlatformType platform, + uint16_t platform_version, uint8_t highest_vtl, + uint64_t shared_gpa_boundary) +{ + /* Default: no support. */ + return false; +} + +static int set_guest_state(hwaddr gpa, uint8_t *ptr, uint64_t len, + ConfidentialGuestPageType memory_type, + uint16_t cpu_index, Error **errp) +{ + error_setg(errp, + "Setting confidential guest state is not supported for this platform"); + return -1; +} + +static int get_mem_map_entry(int index, ConfidentialGuestMemoryMapEntry *entry, + Error **errp) +{ + error_setg( + errp, + "Obtaining the confidential guest memory map is not supported for this platform"); + return -1; +} + static void confidential_guest_support_class_init(ObjectClass *oc, void *data) { + ConfidentialGuestSupportClass *cgsc = CONFIDENTIAL_GUEST_SUPPORT_CLASS(oc); + cgsc->check_support = check_support; + cgsc->set_guest_state = set_guest_state; + cgsc->get_mem_map_entry = get_mem_map_entry; } static void confidential_guest_support_init(Object *obj) diff --git a/include/system/confidential-guest-support.h b/include/system/confidential-guest-support.h index b68c4bebbc..b2cfd1f70c 100644 --- a/include/system/confidential-guest-support.h +++ b/include/system/confidential-guest-support.h @@ -23,6 +23,7 @@ #endif #include "qom/object.h" +#include "exec/hwaddr.h" #define TYPE_CONFIDENTIAL_GUEST_SUPPORT "confidential-guest-support" OBJECT_DECLARE_TYPE(ConfidentialGuestSupport, @@ -30,6 +31,36 @@ OBJECT_DECLARE_TYPE(ConfidentialGuestSupport, CONFIDENTIAL_GUEST_SUPPORT) +typedef enum ConfidentialGuestPlatformType { + CGS_PLATFORM_SEV, + CGS_PLATFORM_SEV_ES, + CGS_PLATFORM_SEV_SNP, +} ConfidentialGuestPlatformType; + +typedef enum ConfidentialGuestMemoryType { + CGS_MEM_RAM, + CGS_MEM_RESERVED, + CGS_MEM_ACPI, + CGS_MEM_NVS, + CGS_MEM_UNUSABLE, +} ConfidentialGuestMemoryType; + +typedef struct ConfidentialGuestMemoryMapEntry { + uint64_t gpa; + uint64_t size; + ConfidentialGuestMemoryType type; +} ConfidentialGuestMemoryMapEntry; + +typedef enum ConfidentialGuestPageType { + CGS_PAGE_TYPE_NORMAL, + CGS_PAGE_TYPE_VMSA, + CGS_PAGE_TYPE_ZERO, + CGS_PAGE_TYPE_UNMEASURED, + CGS_PAGE_TYPE_SECRETS, + CGS_PAGE_TYPE_CPUID, + CGS_PAGE_TYPE_REQUIRED_MEMORY, +} ConfidentialGuestPageType; + struct ConfidentialGuestSupport { Object parent; @@ -68,6 +99,42 @@ typedef struct ConfidentialGuestSupportClass { int (*kvm_init)(ConfidentialGuestSupport *cgs, Error **errp); int (*kvm_reset)(ConfidentialGuestSupport *cgs, Error **errp); + + /* + * Check to see if this confidential guest supports a particular + * platform or configuration. + * + * Return true if supported or false if not supported. + */ + bool (*check_support)(ConfidentialGuestPlatformType platform, + uint16_t platform_version, uint8_t highest_vtl, + uint64_t shared_gpa_boundary); + + /* + * Configure part of the state of a guest for a particular set of data, page + * type and gpa. This can be used for example to pre-populate and measure + * guest memory contents, define private ranges or set the initial CPU state + * for one or more CPUs. + * + * If memory_type is CGS_PAGE_TYPE_VMSA then ptr points to the initial CPU + * context for a virtual CPU. The format of the data depends on the type of + * confidential virtual machine. For example, for SEV-ES ptr will point to a + * vmcb_save_area structure that should be copied into guest memory at the + * address specified in gpa. The cpu_index parameter contains the index of + * the CPU the VMSA applies to. + */ + int (*set_guest_state)(hwaddr gpa, uint8_t *ptr, uint64_t len, + ConfidentialGuestPageType memory_type, + uint16_t cpu_index, Error **errp); + + /* + * Iterate the system memory map, getting the entry with the given index + * that can be populated into guest memory. + * + * Returns 0 for ok, 1 if the index is out of range and -1 on error. + */ + int (*get_mem_map_entry)(int index, ConfidentialGuestMemoryMapEntry *entry, + Error **errp); } ConfidentialGuestSupportClass; static inline int confidential_guest_kvm_init(ConfidentialGuestSupport *cgs,