From patchwork Tue Mar 5 16:42:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 13582731 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 E479FC54798 for ; Tue, 5 Mar 2024 16:46:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rhXvr-0004HE-Ki; Tue, 05 Mar 2024 11:46:23 -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 1rhXvS-0004Cd-DU for qemu-devel@nongnu.org; Tue, 05 Mar 2024 11:46:06 -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 1rhXvQ-0001X3-Ro for qemu-devel@nongnu.org; Tue, 05 Mar 2024 11:45:58 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1709657155; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=ZGyHl/ohgcv7TwxJhwCIe+U2WCSG9+lfm/nNZfJKEIY=; b=K6tjBsdJcc7v3vuRuS1nYvq03F0Bu91RBuyFzrq8O9V3sC/bYvwpVgsAsSLtPyFXTME+iR BK41aUVoVTT4O23oTovYDdfe2eWtomSRux07wmhyTx96ybMEWl86csWNQ5jY5YOZoelXrB J5iw9lZNqrHqMNrsDceBZINmS8eeR9U= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-196-PPjGIh39P6e2J-ZiWxkCDA-1; Tue, 05 Mar 2024 11:42:06 -0500 X-MC-Unique: PPjGIh39P6e2J-ZiWxkCDA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A62D41C382A1 for ; Tue, 5 Mar 2024 16:42:06 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.225.218]) by smtp.corp.redhat.com (Postfix) with ESMTP id 115D74073486; Tue, 5 Mar 2024 16:42:05 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Paolo Bonzini Subject: [PATCH RESEND v3 0/3] i386: Fix Hyper-V Gen1 guests stuck on boot with 'hv-passthrough' Date: Tue, 5 Mar 2024 17:42:01 +0100 Message-ID: <20240305164204.525575-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Received-SPF: pass client-ip=170.10.133.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.568, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 Changes since 'RESEND v2': - Included 'docs/system: Add recommendations to Hyper-V enlightenments doc' in the set as it also requires a "RESEND") Hyper-V Gen1 guests are getting stuck on boot when 'hv-passthrough' is used. While 'hv-passthrough' is a debug only feature, this significantly limit its usefullness. While debugging the problem, I found that there are two loosely connected issues: - 'hv-passthrough' enables 'hv-syndbg' and this is undesired. - 'hv-syndbg's support by KVM is detected incorrectly when !CONFIG_SYNDBG. Fix both issues; exclude 'hv-syndbg' from 'hv-passthrough' and don't allow to turn on 'hv-syndbg' for !CONFIG_SYNDBG builds. Vitaly Kuznetsov (3): i386: Fix conditional CONFIG_SYNDBG enablement i386: Exclude 'hv-syndbg' from 'hv-passthrough' docs/system: Add recommendations to Hyper-V enlightenments doc docs/system/i386/hyperv.rst | 43 +++++++++++++++++++++++++++++++++---- target/i386/cpu.c | 2 ++ target/i386/kvm/kvm.c | 18 ++++++++++------ 3 files changed, 53 insertions(+), 10 deletions(-)