From patchwork Fri Sep 22 12:19:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 13395757 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 5C6A0E71098 for ; Fri, 22 Sep 2023 12:19:55 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qjf82-0004FZ-M3; Fri, 22 Sep 2023 08:19:26 -0400 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 1qjf81-0004FI-FB for qemu-devel@nongnu.org; Fri, 22 Sep 2023 08:19:25 -0400 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 1qjf7z-0007jQ-WD for qemu-devel@nongnu.org; Fri, 22 Sep 2023 08:19:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695385163; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=tzosAyxUhGE9QDJvU79qEShrsZVM9LVDGIUq4K0O808=; b=UYe0JMMMVcDBiGm5k2gtxKiYynDqpdDrkllZAEXLu+tDqp4aaeHh8E6sZXwacNXXuAjKXH hDDjMSdFVthV9rLDsVk7i56KAyAR/EuPQTZuZgdpgD0Ze5rHGGtXXidmqzMUjTuiRz0e2x JNxz7770tyaq4FFWpufuCdumTsYDwnc= Received: from mimecast-mx02.redhat.com (mx-ext.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-327-F2L4j2jZNSq3VFdL8qSlYw-1; Fri, 22 Sep 2023 08:19:20 -0400 X-MC-Unique: F2L4j2jZNSq3VFdL8qSlYw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A68823C108E1 for ; Fri, 22 Sep 2023 12:19:17 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.225.101]) by smtp.corp.redhat.com (Postfix) with ESMTP id A86A071128A; Fri, 22 Sep 2023 12:19:16 +0000 (UTC) From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Paolo Bonzini Cc: Marcelo Tosatti Subject: [PATCH RESEND 0/2] i386: Fix Hyper-V Gen1 guests stuck on boot with 'hv-passthrough' Date: Fri, 22 Sep 2023 14:19:13 +0200 Message-ID: <20230922121915.566591-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Received-SPF: pass client-ip=170.10.129.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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 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 (2): i386: Fix conditional CONFIG_SYNDBG enablement i386: Exclude 'hv-syndbg' from 'hv-passthrough' docs/system/i386/hyperv.rst | 13 +++++++++---- target/i386/cpu.c | 2 ++ target/i386/kvm/kvm.c | 18 ++++++++++++------ 3 files changed, 23 insertions(+), 10 deletions(-)