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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AAD3C64E7B for ; Tue, 1 Dec 2020 11:41:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC07B2086A for ; Tue, 1 Dec 2020 11:41:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730836AbgLALlH (ORCPT ); Tue, 1 Dec 2020 06:41:07 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:8901 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730664AbgLALlH (ORCPT ); Tue, 1 Dec 2020 06:41:07 -0500 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4ClgBR4j31z6vLd; Tue, 1 Dec 2020 19:39:59 +0800 (CST) Received: from [10.174.184.209] (10.174.184.209) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.487.0; Tue, 1 Dec 2020 19:40:14 +0800 Subject: Re: [RFC PATCH v1 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending state to physical side To: Marc Zyngier CC: James Morse , Julien Thierry , Suzuki K Poulose , Eric Auger , , , , , Christoffer Dall , Alex Williamson , Kirti Wankhede , Cornelia Huck , Neo Jia , , References: <20201123065410.1915-1-lushenming@huawei.com> <20201123065410.1915-4-lushenming@huawei.com> <5c724bb83730cdd5dcf7add9a812fa92@kernel.org> <2d2bcae4f871d239a1af50362f5c11a4@kernel.org> <49610291-cf57-ff78-d0ac-063af24efbb4@huawei.com> <48c10467-30f3-9b5c-bbcb-533a51516dc5@huawei.com> <2ad38077300bdcaedd2e3b073cd36743@kernel.org> From: Shenming Lu Message-ID: <9b80d460-e149-20c8-e9b3-e695310b4ed1@huawei.com> Date: Tue, 1 Dec 2020 19:40:14 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: <2ad38077300bdcaedd2e3b073cd36743@kernel.org> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.184.209] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020/12/1 18:55, Marc Zyngier wrote: > On 2020-11-30 07:23, Shenming Lu wrote: > > Hi Shenming, > >> We are pondering over this problem these days, but still don't get a >> good solution... >> Could you give us some advice on this? >> >> Or could we move the restoring of the pending states (include the sync >> from guest RAM and the transfer to HW) to the GIC VM state change handler, >> which is completely corresponding to save_pending_tables (more symmetric?) >> and don't expose GICv4... > > What is "the GIC VM state change handler"? Is that a QEMU thing? Yeah, it is a a QEMU thing... > We don't really have that concept in KVM, so I'd appreciate if you could > be a bit more explicit on this. My thought is to add a new interface (to QEMU) for the restoring of the pending states, which is completely corresponding to KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES... And it is called from the GIC VM state change handler in QEMU, which is happening after the restoring (call kvm_vgic_v4_set_forwarding()) but before the starting (running) of the VFIO device. Thanks, Shenming > > Thanks, > >         M. 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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0ED86C64E7C for ; Wed, 2 Dec 2020 12:25:28 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 554582222A for ; Wed, 2 Dec 2020 12:25:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 554582222A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 6ADC04B354; Wed, 2 Dec 2020 07:25:26 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dS59cZmY8J1v; Wed, 2 Dec 2020 07:25:24 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A01EB4B33C; Wed, 2 Dec 2020 07:25:24 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C883C4C10E for ; Tue, 1 Dec 2020 06:40:33 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id F9t872hPLayO for ; Tue, 1 Dec 2020 06:40:31 -0500 (EST) Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 7E76A4BDCB for ; Tue, 1 Dec 2020 06:40:30 -0500 (EST) Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4ClgBR4j31z6vLd; Tue, 1 Dec 2020 19:39:59 +0800 (CST) Received: from [10.174.184.209] (10.174.184.209) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.487.0; Tue, 1 Dec 2020 19:40:14 +0800 Subject: Re: [RFC PATCH v1 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending state to physical side To: Marc Zyngier References: <20201123065410.1915-1-lushenming@huawei.com> <20201123065410.1915-4-lushenming@huawei.com> <5c724bb83730cdd5dcf7add9a812fa92@kernel.org> <2d2bcae4f871d239a1af50362f5c11a4@kernel.org> <49610291-cf57-ff78-d0ac-063af24efbb4@huawei.com> <48c10467-30f3-9b5c-bbcb-533a51516dc5@huawei.com> <2ad38077300bdcaedd2e3b073cd36743@kernel.org> From: Shenming Lu Message-ID: <9b80d460-e149-20c8-e9b3-e695310b4ed1@huawei.com> Date: Tue, 1 Dec 2020 19:40:14 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: <2ad38077300bdcaedd2e3b073cd36743@kernel.org> Content-Language: en-US X-Originating-IP: [10.174.184.209] X-CFilter-Loop: Reflected X-Mailman-Approved-At: Wed, 02 Dec 2020 07:25:22 -0500 Cc: Neo Jia , kvm@vger.kernel.org, Cornelia Huck , linux-kernel@vger.kernel.org, Kirti Wankhede , Alex Williamson , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Tue, 1 Dec 2020 19:40:14 +0800 Subject: Re: [RFC PATCH v1 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending state to physical side To: Marc Zyngier References: <20201123065410.1915-1-lushenming@huawei.com> <20201123065410.1915-4-lushenming@huawei.com> <5c724bb83730cdd5dcf7add9a812fa92@kernel.org> <2d2bcae4f871d239a1af50362f5c11a4@kernel.org> <49610291-cf57-ff78-d0ac-063af24efbb4@huawei.com> <48c10467-30f3-9b5c-bbcb-533a51516dc5@huawei.com> <2ad38077300bdcaedd2e3b073cd36743@kernel.org> From: Shenming Lu Message-ID: <9b80d460-e149-20c8-e9b3-e695310b4ed1@huawei.com> Date: Tue, 1 Dec 2020 19:40:14 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: <2ad38077300bdcaedd2e3b073cd36743@kernel.org> Content-Language: en-US X-Originating-IP: [10.174.184.209] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201201_064033_319795_81EAD596 X-CRM114-Status: GOOD ( 11.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Neo Jia , kvm@vger.kernel.org, Suzuki K Poulose , Cornelia Huck , linux-kernel@vger.kernel.org, Kirti Wankhede , Christoffer Dall , Eric Auger , Alex Williamson , James Morse , Julien Thierry , yuzenghui@huawei.com, wanghaibin.wang@huawei.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; 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