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 165E4C433F5 for ; Fri, 12 Nov 2021 08:11:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4B6460FBF for ; Fri, 12 Nov 2021 08:11:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234545AbhKLIOD (ORCPT ); Fri, 12 Nov 2021 03:14:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234002AbhKLIOA (ORCPT ); Fri, 12 Nov 2021 03:14:00 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CF17C061766; Fri, 12 Nov 2021 00:11:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=wJHltix5O/T/yNBOoPvxI7+MG7CO2JUeTg1EVcw8kFI=; b=ZZe3KeFAwbgiUPQ08D6J2V7GjK 7P+fNn8Ds07FK5Ia4wwHWDfoUo0iayvxv/sGUVPjZK6n+l1zEgkREBFg5pBsqKbdemAgOCVbPmY5r UbuC0iiOK/y0YODUXAjIXsr6h5s/HtogwmGW7uDrqccd/x4HZp+9kAA2M2JRh8iOMwO4i1FoPbbKk Q0X0phqjnUwEs9d2PFDzFcZLXaDiNixD2kvzEL023kEH0MypsUzSvNcjhZ+NUx6S4SJ4jLh/hMSJF 6+P7F14IXHt7qp9kvVOTP2Lxd8FMKy1/DaWCzCdZ/KiZI5OTliadjmiplJcdwIGuGl0NGMtC9kb8N MPQikC7Q==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.infradead.org) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mlReP-009euC-H2; Fri, 12 Nov 2021 08:11:09 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86: move guest_pv_has out of user_access section From: David Woodhouse To: Paolo Bonzini , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Stephen Rothwell Date: Fri, 12 Nov 2021 08:11:07 +0000 In-Reply-To: <20211112075422.3821671-1-pbonzini@redhat.com> References: <20211112075422.3821671-1-pbonzini@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mdKdWKroCH9xAa/43sMu" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-mdKdWKroCH9xAa/43sMu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-11-12 at 02:54 -0500, Paolo Bonzini wrote: > When UBSAN is enabled, the code emitted for the call to guest_pv_has > includes a call to __ubsan_handle_load_invalid_value. objtool > complains that this call happens with UACCESS enabled; to avoid > the warning, pull the calls to user_access_begin into both arms > of the "if" statement, after the check for guest_pv_has. >=20 > Reported-by: Stephen Rothwell > Cc: David Woodhouse > Signed-off-by: Paolo Bonzini Acked-by: David Woodhouse Thanks. I found a bunch of those objtool warnings during my original experimentation and testing, but clearly missed that one. I'll turn on CONFIG_UBSAN. --=-mdKdWKroCH9xAa/43sMu Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ uOAyOkgIg/cD8Kugav5tyapydeWMZRJQH1vMQ6OVT24CyAn2yXm2NgTQMS1mpzStP2ioPtTnszIQ 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