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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 082EAC31E46 for ; Wed, 12 Jun 2019 10:36:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD90F2082C for ; Wed, 12 Jun 2019 10:36:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408812AbfFLKgu (ORCPT ); Wed, 12 Jun 2019 06:36:50 -0400 Received: from mail-wm1-f68.google.com ([209.85.128.68]:40933 "EHLO mail-wm1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406315AbfFLKgu (ORCPT ); Wed, 12 Jun 2019 06:36:50 -0400 Received: by mail-wm1-f68.google.com with SMTP id v19so5966908wmj.5 for ; Wed, 12 Jun 2019 03:36:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version; bh=iB7poecQTyOsB8cRpdZU55/OXu7pHm3+QgOZegkblOA=; b=ApSo+z48FwnTnQ4cb9R+e4NoAogYlMd0jhMwIJNMcEOEubAFFp8zFMGEjCLCaksZuw qK03liojDUECq6Mot20XTWYJPFfJMCzVXUjKllm4eVVrnzQ4A0vZs+PvOE6JXqRJ92Yo yHVucquFWRMQk+qkA8/Fir17NrAnuekkwYAiiaaBOxLnorUb7wphsblO5rHuYgIeRsbx yHp/Kd1XCfesHpu8GlPEzNOxn2VuY7VjiP72dqmQ9qkdUNJQqEVQ36O9Xj8en3V4Spyt HeYdB8mb7ykED5qP8S/RVmGpOL1sbymABllbe5j3gWLzqhylfXSz3uj/7u/W+Nv7xHHd MLfA== X-Gm-Message-State: APjAAAUs09ZQ3VPOTXVEaDw2vZ0jq1mjj0hXi7nxIymHvsgWt1cCS3X+ bH0dPmp1aSiKVm8zQVEebvyu5w== X-Google-Smtp-Source: APXvYqy2Lghsff9p2s0NVwakfOM4HR5RGFJK7Z2VwhreSAptAgNhXLLGpYIKpQpgKAuNvJTn5PVdng== X-Received: by 2002:a1c:a6d1:: with SMTP id p200mr22496960wme.169.1560335808470; Wed, 12 Jun 2019 03:36:48 -0700 (PDT) Received: from vitty.brq.redhat.com (nat-pool-brq-t.redhat.com. [213.175.37.10]) by smtp.gmail.com with ESMTPSA id q15sm9705618wrr.19.2019.06.12.03.36.47 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Wed, 12 Jun 2019 03:36:48 -0700 (PDT) From: Vitaly Kuznetsov To: Maya Nakamura Cc: x86@kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, mikelley@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, sashal@kernel.org Subject: Re: [PATCH v2 2/5] x86: hv: hv_init.c: Add functions to allocate/deallocate page for Hyper-V In-Reply-To: <5cf4ad6f3fae8dec33e364b367b99cbb5b0f2ba4.1559807514.git.m.maya.nakamura@gmail.com> References: <5cf4ad6f3fae8dec33e364b367b99cbb5b0f2ba4.1559807514.git.m.maya.nakamura@gmail.com> Date: Wed, 12 Jun 2019 12:36:47 +0200 Message-ID: <87muindr9c.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Maya Nakamura writes: > Introduce two new functions, hv_alloc_hyperv_page() and > hv_free_hyperv_page(), to allocate/deallocate memory with the size and > alignment that Hyper-V expects as a page. Although currently they are > not used, they are ready to be used to allocate/deallocate memory on x86 > when their ARM64 counterparts are implemented, keeping symmetry between > architectures with potentially different guest page sizes. > > Signed-off-by: Maya Nakamura > --- > arch/x86/hyperv/hv_init.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c > index e4ba467a9fc6..84baf0e9a2d4 100644 > --- a/arch/x86/hyperv/hv_init.c > +++ b/arch/x86/hyperv/hv_init.c > @@ -98,6 +98,20 @@ EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg); > u32 hv_max_vp_index; > EXPORT_SYMBOL_GPL(hv_max_vp_index); > > +void *hv_alloc_hyperv_page(void) > +{ > + BUILD_BUG_ON(!(PAGE_SIZE == HV_HYP_PAGE_SIZE)); (nit) PAGE_SIZE != HV_HYP_PAGE_SIZE ? > + > + return (void *)__get_free_page(GFP_KERNEL); > +} > +EXPORT_SYMBOL_GPL(hv_alloc_hyperv_page); > + > +void hv_free_hyperv_page(unsigned long addr) > +{ > + free_page(addr); > +} > +EXPORT_SYMBOL_GPL(hv_free_hyperv_page); > + > static int hv_cpu_init(unsigned int cpu) > { > u64 msr_vp_index; Reviewed-by: Vitaly Kuznetsov -- Vitaly