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 718B3C433F5 for ; Tue, 14 Dec 2021 16:05:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235404AbhLNQFG (ORCPT ); Tue, 14 Dec 2021 11:05:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55234 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231494AbhLNQFG (ORCPT ); Tue, 14 Dec 2021 11:05:06 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 007C7C061574; Tue, 14 Dec 2021 08:05:05 -0800 (PST) Received: from zn.tnic (dslb-088-067-202-008.088.067.pools.vodafone-ip.de [88.67.202.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 1EC1C1EC01DF; Tue, 14 Dec 2021 17:05:00 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1639497900; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=CvKZKs3K1S02aP8gGCL57BLEXwZ8163K5Z/pwHkvTYw=; b=n7du2s5k71sYuAU9hRqtj10nW/i1hdOQeyxDRXOoV721Cd6Va+jNJxYyE4hfKuhZbgNNaM KfWPAx4LAj7GUDCTIy96twOJeqTQwVq/LtoGn8wOzH0yJpWSY/a6vtWTLmDfd/L9kbOgQ5 amL+A6pTzbz30GvqWVxI54DllegLQ80= Date: Tue, 14 Dec 2021 17:05:01 +0100 From: Borislav Petkov To: Tianyu Lan Cc: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, 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, 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: Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has() Message-ID: References: <20211213071407.314309-1-ltykernel@gmail.com> <20211213071407.314309-3-ltykernel@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20211213071407.314309-3-ltykernel@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote: > 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, Stick to a single spelling variant: "VM". > swiotlb bounce buffer size needs to adjust according to memory size > in the sev_setup_arch(). So basically you wanna simply say here: "Hyper-V Isolation VMs need to adjust the SWIOTLB size just like SEV guests. Add a hyperv_cc_platform_has() variant which enables that." ? With that addressed you can have my Acked-by: Borislav Petkov Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette