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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3C619C4321E for ; Mon, 5 Dec 2022 10:17:25 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p28Ce-0003Ky-EI; Mon, 05 Dec 2022 04:56:00 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p28CQ-00033z-UT for qemu-devel@nongnu.org; Mon, 05 Dec 2022 04:55:50 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p28CH-0007Pp-Aa for qemu-devel@nongnu.org; Mon, 05 Dec 2022 04:55:46 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670234136; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aiobRrH5ClQFSfmidcrKrBSPHcQQg1qrQq8dbdWq9lo=; b=PIbHABTOXsALpiDEyf/GdSIrOBv875Sk72467+A+DqZzsijTI75ucLgrRSS5xoc+OjXgFd Ul5AtNelNCVTsRLkLbwJetfe0u/fhBeeepU+YnX8Pb4gaRrtQ+blLZVl0wujQRMKBqOvVb DnRfZxuEdi7oTUy0HhKjLXbBnpKxqXI= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-423-kTo15hjpPJme7FVTO3yDcQ-1; Mon, 05 Dec 2022 04:55:33 -0500 X-MC-Unique: kTo15hjpPJme7FVTO3yDcQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A589C3C0F66F; Mon, 5 Dec 2022 09:55:31 +0000 (UTC) Received: from secure.mitica (unknown [10.39.194.135]) by smtp.corp.redhat.com (Postfix) with ESMTP id 632442166B2A; Mon, 5 Dec 2022 09:55:24 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Cc: Fam Zheng , Thomas Huth , Viresh Kumar , Kevin Wolf , Mathieu Poirier , Laurent Vivier , Eric Blake , Richard Henderson , Raphael Norwitz , Stefan Hajnoczi , Juan Quintela , virtio-fs@redhat.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Christian Borntraeger , "Gonglei (Arei)" , qemu-block@nongnu.org, Xiaojuan Yang , Thomas Huth , Ilya Leoshkevich , Eduardo Habkost , Gerd Hoffmann , "Dr. David Alan Gilbert" , Alex Williamson , Eric Farman , Halil Pasic , Peter Maydell , Vladimir Sementsov-Ogievskiy , Jason Wang , Laurent Vivier , Song Gao , qemu-s390x@nongnu.org, Pavel Dovgalyuk , Klaus Jensen , John Snow , Michael Tokarev , qemu-arm@nongnu.org, Paolo Bonzini , "Michael S. Tsirkin" , Keith Busch , David Hildenbrand , qemu-trivial@nongnu.org, Hanna Reitz Subject: [PATCH v2 22/51] target/i386: allow MMX instructions with CR4.OSFXSR=0 Date: Mon, 5 Dec 2022 10:51:59 +0100 Message-Id: <20221205095228.1314-23-quintela@redhat.com> In-Reply-To: <20221205095228.1314-1-quintela@redhat.com> References: <20221205095228.1314-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Received-SPF: pass client-ip=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Paolo Bonzini MMX state is saved/restored by FSAVE/FRSTOR so the instructions are not illegal opcodes even if CR4.OSFXSR=0. Make sure that validate_vex takes into account the prefix and only checks HF_OSFXSR_MASK in the presence of an SSE instruction. Fixes: 20581aadec5e ("target/i386: validate VEX prefixes via the instructions' exception classes", 2022-10-18) Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1350 Reported-by: Helge Konetzka (@hejko on gitlab.com) Reviewed-by: Richard Henderson Signed-off-by: Paolo Bonzini --- target/i386/tcg/decode-new.c.inc | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc index e4878b967f..80c579164f 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -1488,7 +1488,8 @@ static bool validate_vex(DisasContext *s, X86DecodedInsn *decode) if (!(s->flags & HF_AVX_EN_MASK)) { goto illegal; } - } else { + } else if (e->special != X86_SPECIAL_MMX || + (s->prefix & (PREFIX_REPZ | PREFIX_REPNZ | PREFIX_DATA))) { if (!(s->flags & HF_OSFXSR_MASK)) { goto illegal; } -- 2.38.1