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 B6F78C63684 for ; Wed, 26 Jan 2022 16:11:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239506AbiAZQLL (ORCPT ); Wed, 26 Jan 2022 11:11:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239497AbiAZQLK (ORCPT ); Wed, 26 Jan 2022 11:11:10 -0500 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96ED0C06161C; Wed, 26 Jan 2022 08:11:10 -0800 (PST) Received: by mail-pf1-x433.google.com with SMTP id n32so143415pfv.11; Wed, 26 Jan 2022 08:11:10 -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=0tQ228U3nQXaWjV8cViOybTVc9dWTMhKsSPLFqG1IfY=; b=Y9o46Wo42zMqCSbsyBcmqzXIZi9mLVHoOLEBmOmxftVHauCdwprtlA5oNTyoEhv/lM BsJnJKmPK3FuDm9q7GcNTbfGuPI2gyypzpSXLStZAh4BYV/m12jF/hKI610tpFW96CXj nylvUtFW+7fRDveRi2PMMgXXpfdUS7DgSkmPCf2ipPm89TKUc4qkpVVQqTNmp57P2GhD j61gN7wG/Y+8tpV+/PRPug6pEJnQDVliKLf/zT5yAlL1Oj7VYBkMrh07OuWUA2wd/KvB 1bvLa4ltZCktXMwhskOQlbGqOkNQSmYoSK62NCi4LjKMlFdWdGNMPLM9m5sCM8z+Nyy9 7lRA== 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=0tQ228U3nQXaWjV8cViOybTVc9dWTMhKsSPLFqG1IfY=; b=z3HvPfzkPWwx7+Y5PopL785oQMbpckasXm0xrQF1mm6Xeb3DCE3rKtgsxBFtBI1kFF pR5PnS1MQAAnfOo7hj43i8mDuafvl/zfW563pN3cWTfxaN1TkjWTh6KzYc7UAoejoUL+ NUL3XQ/6JJ73T7zQgA3J3MF6nxAa4Vx4XNO3LFkSU0Yx7GAd24WzpWfoqMJW0VVHo0jY dlGgzbgjBzk+svrEQQtwn7qN+udhW5m1CpWRod+pUlKqlvp7P1tZPGNo+cmTH2efxqMh lJfA61T253abx1lJmVRDVPepMk8CJHCfuVC4hUboBqQRwSWFTEFlTGae7aj+hVGfHNag xV/g== X-Gm-Message-State: AOAM533ZmxVIlIufXiDEtVYLoYHXJJKULRDlon6nawfH6tZcJaHkwhsv 0gXLvZZ5flZuPVDN2BjUiR8= X-Google-Smtp-Source: ABdhPJx/62+0JV4W7kaGThLI9clYp04X79pUIPK2kep5k3Cto21975tua1EyydW+0edNiUOUJmpZdg== X-Received: by 2002:a63:7549:: with SMTP id f9mr19021304pgn.259.1643213470086; Wed, 26 Jan 2022 08:11:10 -0800 (PST) Received: from ubuntu-Virtual-Machine.corp.microsoft.com ([2001:4898:80e8:35:cf50:7507:71bb:9b04]) by smtp.gmail.com with ESMTPSA id b9sm2555534pfm.154.2022.01.26.08.11.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jan 2022 08:11:09 -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, hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com, michael.h.kelley@microsoft.com Cc: Tianyu Lan , iommu@lists.linux-foundation.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, vkuznets@redhat.com, brijesh.singh@amd.com, konrad.wilk@oracle.com, hch@lst.de, parri.andrea@gmail.com, thomas.lendacky@amd.com Subject: [PATCH 2/2] x86/hyperv: Set swiotlb_alloc_from_low_pages to false Date: Wed, 26 Jan 2022 11:10:53 -0500 Message-Id: <20220126161053.297386-3-ltykernel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220126161053.297386-1-ltykernel@gmail.com> References: <20220126161053.297386-1-ltykernel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org From: Tianyu Lan In Hyper-V Isolation VM, swiotlb bnounce buffer size maybe 1G at most and there maybe no enough memory from 0 to 4G according to memory layout. Devices in Isolation VM can use memory above 4G as DMA memory. Set swiotlb_ alloc_from_low_pages to false in Isolation VM. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 5a99f993e639..80a0423ac75d 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -343,6 +343,7 @@ static void __init ms_hyperv_init_platform(void) * use swiotlb bounce buffer for dma transaction. */ swiotlb_force = SWIOTLB_FORCE; + swiotlb_alloc_from_low_pages = false; #endif } -- 2.25.1