From nobody Sun Sep 14 14:14:04 2025 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 0EA4BC77B7D for ; Mon, 15 May 2023 17:00:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243420AbjEORAE (ORCPT ); Mon, 15 May 2023 13:00:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243377AbjEOQ7s (ORCPT ); Mon, 15 May 2023 12:59:48 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3FC637AA4; Mon, 15 May 2023 09:59:34 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id 98e67ed59e1d1-24e1d272b09so9579552a91.1; Mon, 15 May 2023 09:59:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1684169973; x=1686761973; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=xj1rg805VeXOzoRW2P320xFoUthoXwFzXIHBhX44V0E=; b=VTKVHLjOWHvcasfBNjghCkChlsRhIg/JX5bBH2I3XS7KpClIu2unj1wv5TWYaBarOn zipMJC0Zb4GH6fdn7Pdqaho0gd+5rSMtNoUiz+R5UvSdH0c3839ZpE0IP2AdGuJe1ssj SLWUUgA9TrOfRVZylWtSdzMaDIRvmQUp+kyAQa9BBKzJ19qY+cbPjdKYoo0gHg+45e/A lSt7AO4bbjL1TATAAkzsseIdt6ce9FrK6SyQg06vWnvXxTnyoWXuRrpnm9rRpxnP09mv B7vDBhi+JSYZEMhxPZdu6uVTOm1uKGOLA6VK4gVXqQmp36fJFxyBgVw/DHECF3opeAea D/tw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684169973; x=1686761973; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=xj1rg805VeXOzoRW2P320xFoUthoXwFzXIHBhX44V0E=; b=fBm8MZOc9PfFUdpwgQZQJ5WdjJcahb3ph1XCCfcfD4KkBfnMycqqMbVGIOyyo1uk+e EMtMxkJRTp3THfCSlMvCIXNuObXSGXwp81+/Hbx8jCVsF8qAQ0rJDLlILbTbinHOYpaD BhZCXwF+uslWTCuxSI6E+LwEQm/qaCjORl76LBOirdgHq3A2tW0qb2auAaI8pGMbxkTr rgWzAOc5tI594Ka2l63GsRjkh518stu7UPStnzU2d2nIyeamp4ZAe3/p7KPXpYbNQKQY WAyPengfmRaVKmJzXKMf0QtZTXzItiFJQzQeXECILUojF29OJW6zGvD1ktwqUGxwuxJh /zBg== X-Gm-Message-State: AC+VfDxsbBxAR+bzzzgfYlWV1Vk1ooU6nyqxjUekgFfTDEQSucs7vAVE +QF9ttRg71Cw/KQs+aAOYBg= X-Google-Smtp-Source: ACHHUZ43s6yfVrKt4NwTH4gtV3IDP9GaE1j4t6MKMEuL+TwJlQbJVog7ei/qZxfmZvmvHcYVpL2t1g== X-Received: by 2002:a17:90a:6046:b0:252:89e6:dea9 with SMTP id h6-20020a17090a604600b0025289e6dea9mr15910674pjm.37.1684169973595; Mon, 15 May 2023 09:59:33 -0700 (PDT) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:f:85bb:dfc8:391f:ff73]) by smtp.gmail.com with ESMTPSA id x13-20020a17090aa38d00b0024df6bbf5d8sm2151pjp.30.2023.05.15.09.59.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 May 2023 09:59:33 -0700 (PDT) From: Tianyu Lan To: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, jgross@suse.com, tiala@microsoft.com, kirill@shutemov.name, jiangshan.ljs@antgroup.com, peterz@infradead.org, ashish.kalra@amd.com, srutherford@google.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com, daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com, sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com, michael.roth@amd.com, thomas.lendacky@amd.com, venu.busireddy@oracle.com, sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com, fenghua.yu@intel.com Cc: pangupta@amd.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: [RFC PATCH V6 06/14] x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest Date: Mon, 15 May 2023 12:59:08 -0400 Message-Id: <20230515165917.1306922-7-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230515165917.1306922-1-ltykernel@gmail.com> References: <20230515165917.1306922-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Tianyu Lan hv vp assist page needs to be shared between SEV-SNP guest and Hyper-V. So mark the page unencrypted in the SEV-SNP guest. Signed-off-by: Tianyu Lan --- arch/x86/hyperv/hv_init.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index a5f9474f08e1..9f3e2d71d015 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -113,6 +114,11 @@ static int hv_cpu_init(unsigned int cpu) =20 } if (!WARN_ON(!(*hvp))) { + if (hv_isolation_type_en_snp()) { + WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1)); + memset(*hvp, 0, PAGE_SIZE); + } + msr.enable =3D 1; wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64); } --=20 2.25.1