From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFC4FC05051 for ; Thu, 10 Aug 2023 16:05:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236442AbjHJQF1 (ORCPT ); Thu, 10 Aug 2023 12:05:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236418AbjHJQE6 (ORCPT ); Thu, 10 Aug 2023 12:04:58 -0400 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECFD4359D; Thu, 10 Aug 2023 09:04:18 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id d9443c01a7336-1bc34b32785so8202905ad.3; Thu, 10 Aug 2023 09:04:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1691683458; x=1692288258; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=+SF3zl+41agUIJM1O+gfEeVKPjmemuCif+mwIFH9rTo=; b=KqpQ0z8Ti+5O1OhHON2G2g8Yi68CISYwscSZk+hMCO1qDfrwUIFODn+iq6elxrV3xY YdvC6NjsX8VhdP9Q3/agD6Y+t8NU/gzNpnFtlmhLavueSTvPoMCJ70QqLM3xTQWmyqUd TJxkR3UkLjQYhERaBSpQa6DBh4TvrzyWqxdUhB0cEA1qywRxBJYgxVUQb1JsnoRqD97/ fjHJBJxYPu991as0MGXXNglPdesWCF0hRV+3+gKwmNONCllKZxCDFLidfmKcglwfG7C5 Tb+RY2qeu5QPms8TmjYBN4Q62MwCwiBo/bvA2ceRtuFMUz9m+gYNE+iRJ6LnMT1SKqlP Xg6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691683458; x=1692288258; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=+SF3zl+41agUIJM1O+gfEeVKPjmemuCif+mwIFH9rTo=; b=U7o3tDQQQ/s7Ax1ixzFBY3LLX/48b0ZyecbFIkQH/2V2ISDqZ6vl410yp9v6Y0s5rF fzUNJWvYyPd4GXIKobTCs9ZRBzHL16aEkJ9r34g26sjrPb0R2sf31QiKR0LwZpuVYMYR z7rUL11onkYzL4NUW//Eb/4rBojqtZCu8KfEnFXpLoEcjTzo/uJAYSwooVhhN5BXJBRd mPWZO88GgJzORLPrg3oBBcv8EQfL0rHnn08s21/3J8k8c/wa95LJoch1frfxHh+i/a8u 4dXjyZN02qLSGqBvFsx+RcdFZ7UuyfSKHGXI+9Xm/Je8brabQ0Gbn1nNeU53w8vvlaSR tMrw== X-Gm-Message-State: AOJu0YzKP5u/zl01d5a3qFEE3mdu3PHJ6Tads/d8WWcRZMgH+KlM+p8q jLe3fgD92vJmn2oyJkzJHis= X-Google-Smtp-Source: AGHT+IERCcvEDw2pKF0cSddJ8O9j63OatCR5sYqSdwi0B65DvV6sgtIFx2CDTMiC/jLgW16c9Ua0Tg== X-Received: by 2002:a17:902:9a91:b0:1bc:9c49:f8ce with SMTP id w17-20020a1709029a9100b001bc9c49f8cemr2407104plp.4.1691683458189; Thu, 10 Aug 2023 09:04:18 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:0:c620:2003:6c97:8057]) by smtp.gmail.com with ESMTPSA id r4-20020a1709028bc400b001b895a17429sm1948821plo.280.2023.08.10.09.04.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Aug 2023 09:04:16 -0700 (PDT) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, daniel.lezcano@linaro.org, arnd@arndb.de, michael.h.kelley@microsoft.com Cc: Tianyu Lan , linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, vkuznets@redhat.com Subject: [PATCH V5 0/8] x86/hyperv: Add AMD sev-snp enlightened guest support on hyperv Date: Thu, 10 Aug 2023 12:04:03 -0400 Message-Id: <20230810160412.820246-1-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org From: Tianyu Lan *** BLURB HERE *** Hyper-V provides two modes for running SEV-SNP VMs: 1) In vTOM mode with a paravisor (see Section 15.36.8 of [1]) 2) In "fully enlightened" mode with normal "C" bit control over page encryption, and no paravisor For #1, the paravisor runs in VMPL 0, while Linux runs in VMPL 2 (see Section 15.36.7 of [1]). The paravisor is typically provided by Hyper-V and handles most of the SNP-related functionality. As such, most of the SNP functionality in the Linux guest is bypassed. The guest operates in vTOM mode, where encryption is enabled by default. The guest must still request page transitions between private and shared, but there is relatively less SNP machinery required in the guest. Support for this mode of operation first went upstream in the 5.15 kernel. For #2, this patch set provides the initial support. The existing SEV-SNP machinery in the kernel is fully used, but Hyper-V specific updates are required to properly share Hyper-V communication pages between the guest and host and to start APs at boot time. In either mode, Hyper-V requires that the guest implement the SEV-SNP Restricted Interrupt Injection feature (see Section 15.36.16 of [1], and Section 5 of [2]). Without this feature, the guest is subject to attack by a compromised hypervisor that can inject any exception at any time, such as injecting an interrupt while the guest has interrupts disabled. In vTOM mode, Restricted Interrupt Injection is implemented by the paravisor, so no Linux guest changes are required. But in fully enlightened mode, the Linux guest must provide the implementation. This patch set is derived from an earlier patch set that includes both the Hyper-V specific changes and Restricted Interrupt Injection support.[3] But it is now limited to only the Hyper-V specific changes. The Restricted Interrupt Injection support will come later in a separate patch set. [1] https://www.amd.com/system/files/TechDocs/24593.pdf [2] https://www.amd.com/system/files/TechDocs/56421-guest-hypervisor-communication-block-standardization.pdf [3] https://lore.kernel.org/lkml/20230515165917.1306922-1-ltykernel@gmail.com/ Change since v4: * Fix compile error on the ARM or other platform. Change since v3: * Fix fossil comment Change since v2: * Update Change log. * Rework Hyper-V hypercall implementation. Change since v1: * vTOM case uses paravisor_present flag and HV_ISOLATION_TYPE_SNP type. * Rework some patches' change log * Fix some comments in the patches Tianyu Lan (8): x86/hyperv: Add sev-snp enlightened guest static key x86/hyperv: Set Virtual Trust Level in VMBus init message x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest drivers: hv: Mark percpu hvcall input arg page unencrypted in SEV-SNP enlightened guest x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest x86/hyperv: Add smp support for SEV-SNP guest x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES arch/x86/hyperv/hv_init.c | 55 +++++++++++++- arch/x86/hyperv/ivm.c | 111 +++++++++++++++++++++++++++++ arch/x86/include/asm/hyperv-tlfs.h | 7 ++ arch/x86/include/asm/mshyperv.h | 43 +++++++---- arch/x86/kernel/cpu/mshyperv.c | 43 +++++++++-- drivers/clocksource/hyperv_timer.c | 2 +- drivers/hv/connection.c | 1 + drivers/hv/hv.c | 57 ++++++++++++++- drivers/hv/hv_common.c | 19 +++++ include/asm-generic/hyperv-tlfs.h | 1 + include/asm-generic/mshyperv.h | 14 +++- include/linux/hyperv.h | 4 +- 12 files changed, 330 insertions(+), 27 deletions(-) -- 2.25.1