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spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50186 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lTxpk-0003lh-Sz for qemu-devel@archiver.kernel.org; Tue, 06 Apr 2021 22:22:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54056) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lTxoa-000384-LQ for qemu-devel@nongnu.org; Tue, 06 Apr 2021 22:21:09 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:59812) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lTxoU-0005CX-Fs for qemu-devel@nongnu.org; Tue, 06 Apr 2021 22:21:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617762059; 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: in-reply-to:in-reply-to:references:references; bh=VUXF23ooOMUrgLyokWCy4mTUtz/dxedRlg0fqcskITs=; b=gf6Jjssg5ZROSGCa8mFHc2FZKPPffkhAYlhGzN/ZXqoiZQXkLECTrppTSLvA2KxrqZKrGg ++AxusgrNc2KGte+DwZjCbYHBCF/3nfdv0r2i57T2u5u4uon8dD8m/dsbz+0aoiBVmeX3W LKIA4fV4Jyt2UimZuijm5TfjREJSIuY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-379-Pvem55i-PGK5So3KaCbbHw-1; Tue, 06 Apr 2021 22:20:57 -0400 X-MC-Unique: Pvem55i-PGK5So3KaCbbHw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 94D1281621; Wed, 7 Apr 2021 02:20:56 +0000 (UTC) Received: from wangxiaodeMacBook-Air.local (ovpn-13-182.pek2.redhat.com [10.72.13.182]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9677C19D9D; Wed, 7 Apr 2021 02:20:43 +0000 (UTC) Subject: Re: [PATCH 0/6] Add debug interface to kick/call on purpose To: Dongli Zhang , qemu-block@nongnu.org, qemu-devel@nongnu.org References: <20210326054433.11762-1-dongli.zhang@oracle.com> <440216a8-821f-92dd-bc8b-fb2427bdc0e6@redhat.com> <9248ae00-9a7d-c960-a673-9b3a3ede0452@oracle.com> <2e48f463-0a17-4ffd-c3a6-4a847e0e34c6@oracle.com> <5b21b2a2-e3bd-3812-61d7-bd3550cf680f@redhat.com> From: Jason Wang Message-ID: <41cec775-8d41-8bf4-7ea6-ea45343dc451@redhat.com> Date: Wed, 7 Apr 2021 10:20:41 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.9.0 MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, fam@euphon.net, berrange@redhat.com, ehabkost@redhat.com, mst@redhat.com, joe.jin@oracle.com, armbru@redhat.com, dgilbert@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 在 2021/4/7 上午7:27, Dongli Zhang 写道: >> This will answer your question that "Can it bypass the masking?". >> >> For vhost-scsi, virtio-blk, virtio-scsi and virtio-net, to write to eventfd is >> not able to bypass masking because masking is to unregister the eventfd. To >> write to eventfd does not take effect. >> >> However, it is possible to bypass masking for vhost-net because vhost-net >> registered a specific masked_notifier eventfd in order to mask irq. To write to >> original eventfd still takes effect. >> >> We may leave the user to decide whether to write to 'masked_notifier' or >> original 'guest_notifier' for vhost-net. > My fault here. To write to masked_notifier will always be masked:( Only when there's no bug in the qemu. > > If it is EventNotifier level, we will not care whether the EventNotifier is > masked or not. It just provides an interface to write to EventNotifier. Yes. > > To dump the MSI-x table for both virtio and vfio will help confirm if the vector > is masked. That would be helpful as well. It's probably better to extend "info pci" command. Thanks > > Thank you very much! > > Dongli Zhang >