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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 DB587C0650F for ; Tue, 30 Jul 2019 09:50:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B265320679 for ; Tue, 30 Jul 2019 09:50:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="HxXrNsOH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730440AbfG3JuG (ORCPT ); Tue, 30 Jul 2019 05:50:06 -0400 Received: from mail-qt1-f195.google.com ([209.85.160.195]:37843 "EHLO mail-qt1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730116AbfG3JuF (ORCPT ); Tue, 30 Jul 2019 05:50:05 -0400 Received: by mail-qt1-f195.google.com with SMTP id y26so62369775qto.4; Tue, 30 Jul 2019 02:50:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=9DjvcDg0UMTw/Qo0I1RSb4k+ACs5La7hPpr0+lfP19A=; b=HxXrNsOHqfC8209335cKwGVoe6a8Kh0sGxDQ2tcFq7/pLU+cKdWUaYJi6dTWanwmZE inGBNSrDH1U2/8tfilI15v+T0j7CTnUbx6tQpDXPq7FAm1ygm4ZezPCiRz2AAK3+0AB4 v4JvEQMYuVviApBRbrsJ7wdVHSZJnGoneIcQRccgncx8HJ4uDCZRdznGvMe3FcGZfd3K VIKImWn9kV5QNUq0q0R2KTdAjG/MTD6h1n6AYfQHR04Y1hpOoFxhQf5Lt2UIZqLjhj8o mWXXgX07Tudv/h0UiYF6pCQrtIhmqH3WbqYBMikkxAeTkRRqSIKeVv2FBcE3bn+eKmbJ x9vg== 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:date:message-id:in-reply-to :references; bh=9DjvcDg0UMTw/Qo0I1RSb4k+ACs5La7hPpr0+lfP19A=; b=DBnF/Ce60gHLKer/IfoNcZDJluRlb6UBbYncY1ETQzhy7VAu6eLOXX091wOJ1WuFRn Ia9iW4jxorZviMh463MDWsraX8uz4p+9llqRt5sKxmre6tM7JjBm66qjdjFLlgioAd/T NQKWwkZsS9pk7VZGrea6ihW4eYWsw701dfJio0HpTy6x+FGZ0r7FQ+HrU6S0JAJhARMi GwiFnZ1YyQ4jzvIiBeNzPn2ZjKlERefHycVERqLrVXBclaMBgBq15AS8rFAAFscyrX+G no+9pfbPqUMZKgPJ/ZNy5D2eD1HW0EzsXv9gPNkP72RnZaZTLJgNp+ihIX/EKVKVO+Jl bOkQ== X-Gm-Message-State: APjAAAW2AsNKJzapT3VcJQdnLmkxKV1ELcXHShJ3UUAb1gacDkgM8xvN wiBKE1rITmTAPiTT2bX2iLM= X-Google-Smtp-Source: APXvYqwwar7vwPiNc8oQEYFeveOePMFHWskdKnLKcZ2HB/WvyxxDN6m0nzMhO5BfrPpAqu4v21SbZw== X-Received: by 2002:a0c:b88e:: with SMTP id y14mr79617765qvf.93.1564480204446; Tue, 30 Jul 2019 02:50:04 -0700 (PDT) Received: from AzureHyper-V.3xjlci4r0w3u5g13o212qxlisd.bx.internal.cloudapp.net ([13.68.195.119]) by smtp.gmail.com with ESMTPSA id d9sm28198078qke.136.2019.07.30.02.50.03 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 30 Jul 2019 02:50:04 -0700 (PDT) From: Himadri Pandya X-Google-Original-From: Himadri Pandya To: mikelley@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, sashal@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com Cc: x86@kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, Himadri Pandya Subject: [PATCH 1/2] x86: hv: Add function to allocate zeroed page for Hyper-V Date: Tue, 30 Jul 2019 09:49:43 +0000 Message-Id: <20190730094944.96007-2-himadri18.07@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190730094944.96007-1-himadri18.07@gmail.com> References: <20190730094944.96007-1-himadri18.07@gmail.com> Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org Hyper-V assumes page size to be 4K. While this assumption holds true on x86 architecture, it might not be true for ARM64 architecture. Hence define hyper-v specific function to allocate a zeroed page which can have a different implementation on ARM64 architecture to handle the conflict between hyper-v's assumed page size and actual guest page size. Signed-off-by: Himadri Pandya --- arch/x86/hyperv/hv_init.c | 8 ++++++++ arch/x86/include/asm/mshyperv.h | 1 + 2 files changed, 9 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index d314cf1e15fd..2d0b9b2bddf7 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -45,6 +45,14 @@ void *hv_alloc_hyperv_page(void) } EXPORT_SYMBOL_GPL(hv_alloc_hyperv_page); +void *hv_alloc_hyperv_zeroed_page(void) +{ + BUILD_BUG_ON(PAGE_SIZE != HV_HYP_PAGE_SIZE); + + return (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); +} +EXPORT_SYMBOL_GPL(hv_alloc_hyperv_zeroed_page); + void hv_free_hyperv_page(unsigned long addr) { free_page(addr); diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index f4138aeb4280..6b79515abb82 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -219,6 +219,7 @@ static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) void __init hyperv_init(void); void hyperv_setup_mmu_ops(void); void *hv_alloc_hyperv_page(void); +void *hv_alloc_hyperv_zeroed_page(void); void hv_free_hyperv_page(unsigned long addr); void hyperv_reenlightenment_intr(struct pt_regs *regs); void set_hv_tscchange_cb(void (*cb)(void)); -- 2.17.1