From patchwork Wed Feb 1 13:57:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 13124349 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 EC2ABC05027 for ; Wed, 1 Feb 2023 13:58:30 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pNDcm-0006Yj-Nl; Wed, 01 Feb 2023 08:58:08 -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 1pNDcl-0006US-50 for qemu-devel@nongnu.org; Wed, 01 Feb 2023 08:58:07 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pNDcj-00030R-OE for qemu-devel@nongnu.org; Wed, 01 Feb 2023 08:58:06 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1675259885; 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; bh=WAQmCv/hikr9WcEhcbFx2TiSB5mzzF0mr4V+771Qf+Y=; b=I/4uZBgURSqQkHj0Uoo3JoWHfuslP56T5AxvRIXzluBpggpQb3hfXZPPmQikJdmnJDxF7K vNlYXF+f7exWnA1k9/bjMXm22pEdBfkzF4UtEsFz0g0ij9ijlomHLeRJQaM2Q6B47CJsnC fbcS8W6snZdFwF6xsCZdFB53424AIu4= 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-562-OdGhjbe6M3-wSB4HU7yuoQ-1; Wed, 01 Feb 2023 08:58:01 -0500 X-MC-Unique: OdGhjbe6M3-wSB4HU7yuoQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7D0B138123B1; Wed, 1 Feb 2023 13:58:01 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3045240C141B; Wed, 1 Feb 2023 13:58:01 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Richard Henderson , Maxim Levitsky , Yang Zhong , Vitaly Kuznetsov , Jing Liu , Emanuele Giuseppe Esposito Subject: [PATCH 0/2] target/i386: add support for cpu FLUSH_L1D feature and FB_CLEAR capability Date: Wed, 1 Feb 2023 08:57:57 -0500 Message-Id: <20230201135759.555607-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eesposit@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=ham 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 QEMU should be able to show the guest the above feature/capability, otherwise we risk to have false vulnerability reports in the guest like in /sys/devices/system/cpu/vulnerabilities/mmio_stale_data because the mitigation is present only if the guest supports (FLUSH_L1D and MD_CLEAR) or FB_CLEAR. Emanuele Emanuele Giuseppe Esposito (2): target/i386: add support for FLUSH_L1D feature target/i386: add support for FB_CLEAR feature target/i386/cpu.h | 3 +++ target/i386/cpu.c | 4 ++-- 2 files changed, 5 insertions(+), 2 deletions(-)