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 X-Spam-Level: X-Spam-Status: No, score=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22F37C4338F for ; Mon, 9 Aug 2021 22:12:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F0BAF6054F for ; Mon, 9 Aug 2021 22:12:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236603AbhHIWNI (ORCPT ); Mon, 9 Aug 2021 18:13:08 -0400 Received: from mga04.intel.com ([192.55.52.120]:46227 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232683AbhHIWNH (ORCPT ); Mon, 9 Aug 2021 18:13:07 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10070"; a="212935547" X-IronPort-AV: E=Sophos;i="5.84,308,1620716400"; d="scan'208";a="212935547" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Aug 2021 15:12:46 -0700 X-IronPort-AV: E=Sophos;i="5.84,308,1620716400"; d="scan'208";a="444723667" Received: from jasonkon-mobl1.amr.corp.intel.com (HELO [10.209.114.115]) ([10.209.114.115]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Aug 2021 15:12:43 -0700 Subject: Re: [PATCH V3 03/13] x86/HV: Add new hvcall guest address host visibility support To: Tianyu Lan , 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, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, ardb@kernel.org, Tianyu.Lan@microsoft.com, pgonda@google.com, martin.b.radev@gmail.com, akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, rppt@kernel.org, sfr@canb.auug.org.au, saravanand@fb.com, krish.sadhukhan@oracle.com, aneesh.kumar@linux.ibm.com, xen-devel@lists.xenproject.org, rientjes@google.com, hannes@cmpxchg.org, tj@kernel.org, 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, parri.andrea@gmail.com References: <20210809175620.720923-1-ltykernel@gmail.com> <20210809175620.720923-4-ltykernel@gmail.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210809175620.720923-4-ltykernel@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On 8/9/21 10:56 AM, Tianyu Lan wrote: > From: Tianyu Lan > > Add new hvcall guest address host visibility support to mark > memory visible to host. Call it inside set_memory_decrypted > /encrypted(). Add HYPERVISOR feature check in the > hv_is_isolation_supported() to optimize in non-virtualization > environment. >From an x86/mm perspective: Acked-by: Dave Hansen A tiny nit: > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c > index 0bb4d9ca7a55..b3683083208a 100644 > --- a/arch/x86/hyperv/hv_init.c > +++ b/arch/x86/hyperv/hv_init.c > @@ -607,6 +607,12 @@ EXPORT_SYMBOL_GPL(hv_get_isolation_type); > > bool hv_is_isolation_supported(void) > { > + if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) > + return 0; > + > + if (!hypervisor_is_type(X86_HYPER_MS_HYPERV)) > + return 0; > + > return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE; > } This might be worthwhile to move to a header. That ensures that hv_is_isolation_supported() use can avoid even a function call. But, I see this is used in modules and its use here is also in a slow path, so it's not a big deal