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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF806C433FE for ; Mon, 15 Nov 2021 21:53:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A6E8163227 for ; Mon, 15 Nov 2021 21:53:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352121AbhKOVy7 (ORCPT ); Mon, 15 Nov 2021 16:54:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:36788 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241755AbhKOSZC (ORCPT ); Mon, 15 Nov 2021 13:25:02 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1370B632C4; Mon, 15 Nov 2021 17:55:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636998918; bh=WWaQGgmjyPlNANn38lv8ha4hD3vCPfBuI2DDBxHsM0k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XoSCEOYwszePui9QSIdeYSTN+7Qg2FmGP8Lq1Q7GgWsThfUo5hhuVpNWyOOEUIb5d JRAI02/LwqhXt+flRKUYFZidrhPXt8MupVinh9ZupBSNzmpbDCwHOAKboxiNWOCoHM THAvnzgkybezk5g6cag5HGJO6Spxh+rw0DW4YXKE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andreas Gruenbacher Subject: [PATCH 5.14 102/849] powerpc/kvm: Fix kvm_use_magic_page Date: Mon, 15 Nov 2021 17:53:05 +0100 Message-Id: <20211115165423.535991169@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andreas Gruenbacher commit 0c8eb2884a42d992c7726539328b7d3568f22143 upstream. When switching from __get_user to fault_in_pages_readable, commit 9f9eae5ce717 broke kvm_use_magic_page: like __get_user, fault_in_pages_readable returns 0 on success. Fixes: 9f9eae5ce717 ("powerpc/kvm: Prefer fault_in_pages_readable function") Cc: stable@vger.kernel.org # v4.18+ Signed-off-by: Andreas Gruenbacher Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kernel/kvm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/powerpc/kernel/kvm.c +++ b/arch/powerpc/kernel/kvm.c @@ -669,7 +669,7 @@ static void __init kvm_use_magic_page(vo on_each_cpu(kvm_map_magic_page, &features, 1); /* Quick self-test to see if the mapping works */ - if (!fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) { + if (fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) { kvm_patching_worked = false; return; }