From patchwork Thu Apr 14 13:09:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 561906 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 114E2C433FE for ; Thu, 14 Apr 2022 13:18:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243731AbiDNNUd (ORCPT ); Thu, 14 Apr 2022 09:20:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238332AbiDNNTM (ORCPT ); Thu, 14 Apr 2022 09:19:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CF9F92D30; Thu, 14 Apr 2022 06:16:32 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1492F61378; Thu, 14 Apr 2022 13:16:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D910C385A5; Thu, 14 Apr 2022 13:16:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649942191; bh=COGJg5rp39d1i+qlK8mdhBqg3wwbEIWZrZ6Av4vGLxM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k28Ug11TLx0pmz0M+9c6oTF72e9x/htDkCAMZtG7c1v6H+atf9I5qNwrVZPt8c/tm IVb0K9Ig+6Qe54JjaIBGGnsntccFDHG0wWbeKHn/ciZj+G8j5Fg5wCSdUa/EEM4JYa t2vCL0Tz7l3AQCycIQVjLkjZQVmxpUja37UGqz2E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andreas Gruenbacher , Anand Jain Subject: [PATCH 4.19 047/338] powerpc/kvm: Fix kvm_use_magic_page Date: Thu, 14 Apr 2022 15:09:10 +0200 Message-Id: <20220414110840.235877016@linuxfoundation.org> X-Mailer: git-send-email 2.35.2 In-Reply-To: <20220414110838.883074566@linuxfoundation.org> References: <20220414110838.883074566@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@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: Anand Jain 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 @@ -680,7 +680,7 @@ static void kvm_use_magic_page(void) 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; }