From patchwork Mon Dec 13 07:14:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tianyu Lan X-Patchwork-Id: 12673159 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 7332AC4167E for ; Mon, 13 Dec 2021 07:14:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232429AbhLMHO3 (ORCPT ); Mon, 13 Dec 2021 02:14:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232340AbhLMHOY (ORCPT ); Mon, 13 Dec 2021 02:14:24 -0500 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A3ED6C06173F; Sun, 12 Dec 2021 23:14:23 -0800 (PST) Received: by mail-pj1-x1033.google.com with SMTP id gf14-20020a17090ac7ce00b001a7a2a0b5c3so13959670pjb.5; Sun, 12 Dec 2021 23:14:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=LTLz7GgAX11MfClfWm4VByenkQJ5cwVcinYkI0CYydg=; b=eIBO98gr6cqdhEubdZxn7qJbRXcsGJcQJKCTBTWQMyIeHrNp5xrHWYdAoKYNVGEidJ LFwP3LjGoL5tFuzB2FoB5YpZg5bwVmowqjbEIb8AsmhZerCmxw86+voMBrO3FdsH4LZ1 v8oAohgYKdqLsMvZ/GTDqezGmPqe06lPPdMYJ8kKDtdDCRGI+T2u1D6j25qAwdvo7zlI 679EHAHUZ/Q7woRuLMzvvmv9YQOH/DT1Dkg52bG9+CtfhWhBq/5McohZ6K/5TT2Unmva iRnNz4FNW2NV5wXk4ssnY1Wipt5DNixWOWnYmq/MRnkkFwLm0dKEKvTE3IQj4PHbr8gx d9CQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=LTLz7GgAX11MfClfWm4VByenkQJ5cwVcinYkI0CYydg=; b=vZGaqqu7ea7Ea3vNtiv0X7mx2IcN99tqz/kdBxfWE4Jy5LsxMGtNwS3QRMY8Ld/HEn hLmAtbo1pgqWlpEKge2+rhxzLXgYfvqyvTCnIJW/qGYPbxOgAqWftpR7eRGijf/zrHbq 3X/unmaOpep8JCrbZaV+OCwNYULp4nftKMp+I/bkDgy1lbMS91/hOUUH7WXhclXTtwCR O3QTWnNeKChhlShkdnQ1Evw79GnYlDFqGGHnqXYDobyuojpv/AwZaxqsrbE9LP+K/joJ kn5pBpXYV1BOiPbnDPRMKUEbZYPQcutNZaalTRq/rN9Ga95agsQbee0VHKhrHHUWJ4wx 8N5Q== X-Gm-Message-State: AOAM531QVeqLGvaSclXqYY5EL4sbBrNO5VFwGiXSLPQ1r7eU/Jq8WdlV RwqZVOSlrkdXFq6HgENU/m0= X-Google-Smtp-Source: ABdhPJwyUng+IRJS7MH80C/GEuQWaWTRNRKCx4z2HRH688KUyKHYm7NSiU3shK/X0mt0z+tL2buWiw== X-Received: by 2002:a17:902:c947:b0:141:e7f6:d688 with SMTP id i7-20020a170902c94700b00141e7f6d688mr92839450pla.56.1639379663188; Sun, 12 Dec 2021 23:14:23 -0800 (PST) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:36:a586:a4cb:7d3:4f27]) by smtp.gmail.com with ESMTPSA id qe12sm6079401pjb.29.2021.12.12.23.14.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 12 Dec 2021 23:14:22 -0800 (PST) From: Tianyu Lan To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@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, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com, michael.h.kelley@microsoft.com Cc: iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, brijesh.singh@amd.com, konrad.wilk@oracle.com, hch@lst.de, joro@8bytes.org, parri.andrea@gmail.com, dave.hansen@intel.com Subject: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has() Date: Mon, 13 Dec 2021 02:14:03 -0500 Message-Id: <20211213071407.314309-3-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211213071407.314309-1-ltykernel@gmail.com> References: <20211213071407.314309-1-ltykernel@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Tianyu Lan Hyper-V provides Isolation VM for confidential computing support and guest memory is encrypted in it. Places checking cc_platform_has() with GUEST_MEM_ENCRYPT attr should return "True" in Isolation vm. e.g, swiotlb bounce buffer size needs to adjust according to memory size in the sev_setup_arch(). Add GUEST_MEM_ENCRYPT check for Hyper-V Isolation VM. Signed-off-by: Tianyu Lan Acked-by: Borislav Petkov --- Change since v6: * Change the order in the cc_platform_has() and check sev first. Change since v3: * Change code style of checking GUEST_MEM attribute in the hyperv_cc_platform_has(). --- arch/x86/kernel/cc_platform.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/cc_platform.c b/arch/x86/kernel/cc_platform.c index 03bb2f343ddb..6cb3a675e686 100644 --- a/arch/x86/kernel/cc_platform.c +++ b/arch/x86/kernel/cc_platform.c @@ -11,6 +11,7 @@ #include #include +#include #include static bool __maybe_unused intel_cc_platform_has(enum cc_attr attr) @@ -58,12 +59,19 @@ static bool amd_cc_platform_has(enum cc_attr attr) #endif } +static bool hyperv_cc_platform_has(enum cc_attr attr) +{ + return attr == CC_ATTR_GUEST_MEM_ENCRYPT; +} bool cc_platform_has(enum cc_attr attr) { if (sme_me_mask) return amd_cc_platform_has(attr); + if (hv_is_isolation_supported()) + return hyperv_cc_platform_has(attr); + return false; } EXPORT_SYMBOL_GPL(cc_platform_has);