From patchwork Thu Sep 22 14:53:45 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Habkost X-Patchwork-Id: 9345487 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 24F2E60757 for ; Thu, 22 Sep 2016 15:03:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 16D8D2AB8A for ; Thu, 22 Sep 2016 15:03:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0A0A42AB94; Thu, 22 Sep 2016 15:03:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B394B2AB8A for ; Thu, 22 Sep 2016 15:03:24 +0000 (UTC) Received: from localhost ([::1]:49652 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bn5X1-0002aA-2h for patchwork-qemu-devel@patchwork.kernel.org; Thu, 22 Sep 2016 11:03:23 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46317) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bn5Nv-0001rr-Jd for qemu-devel@nongnu.org; Thu, 22 Sep 2016 10:54:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bn5Nt-0008C2-BU for qemu-devel@nongnu.org; Thu, 22 Sep 2016 10:53:58 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47962) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bn5Nt-0008Bq-5T for qemu-devel@nongnu.org; Thu, 22 Sep 2016 10:53:57 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 98FEAC0AE697; Thu, 22 Sep 2016 14:53:56 +0000 (UTC) Received: from localhost (ovpn-116-75.phx2.redhat.com [10.3.116.75]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u8MErtP1013873; Thu, 22 Sep 2016 10:53:56 -0400 From: Eduardo Habkost To: qemu-devel@nongnu.org Date: Thu, 22 Sep 2016 11:53:45 -0300 Message-Id: <1474556029-24992-3-git-send-email-ehabkost@redhat.com> In-Reply-To: <1474556029-24992-1-git-send-email-ehabkost@redhat.com> References: <1474556029-24992-1-git-send-email-ehabkost@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 22 Sep 2016 14:53:56 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 2/6] target-i386: Add a marker to end of the region zeroed on reset X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Bandan Das , Brijesh Singh , Igor Mammedov , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Instead of using cpuid_level, use an empty struct as a marker (like we already did with {start,end}_init_save). This will avoid accidentaly resetting the wrong fields if we change the field ordering on CPUX86State. Signed-off-by: Eduardo Habkost --- target-i386/cpu.c | 2 +- target-i386/cpu.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/target-i386/cpu.c b/target-i386/cpu.c index 920b78f..26f0e59 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -2714,7 +2714,7 @@ static void x86_cpu_reset(CPUState *s) xcc->parent_reset(s); - memset(env, 0, offsetof(CPUX86State, cpuid_level)); + memset(env, 0, offsetof(CPUX86State, end_reset_fields)); tlb_flush(s, 1); diff --git a/target-i386/cpu.h b/target-i386/cpu.h index 27af9c3..604d591 100644 --- a/target-i386/cpu.h +++ b/target-i386/cpu.h @@ -1108,6 +1108,7 @@ typedef struct CPUX86State { CPU_COMMON /* Fields from here on are preserved across CPU reset. */ + struct {} end_reset_fields; /* processor features (e.g. for CPUID insn) */ uint32_t cpuid_level;