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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 65DBDECDFB8 for ; Fri, 20 Jul 2018 08:04:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 27E4020673 for ; Fri, 20 Jul 2018 08:04:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 27E4020673 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727756AbeGTIvb (ORCPT ); Fri, 20 Jul 2018 04:51:31 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:55568 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727219AbeGTIvb (ORCPT ); Fri, 20 Jul 2018 04:51:31 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A9D4872630; Fri, 20 Jul 2018 08:04:26 +0000 (UTC) Received: from [10.36.117.156] (ovpn-117-156.ams2.redhat.com [10.36.117.156]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3F769111DCE5; Fri, 20 Jul 2018 08:04:25 +0000 (UTC) Subject: Re: [PATCH v3 5/6] KVM: X86: Add NMI support to PV IPIs To: Wanpeng Li , Radim Krcmar Cc: LKML , kvm , Vitaly Kuznetsov References: <1530598891-21370-1-git-send-email-wanpengli@tencent.com> <1530598891-21370-6-git-send-email-wanpengli@tencent.com> <20180719163138.GC11749@flask> From: Paolo Bonzini Openpgp: preference=signencrypt Autocrypt: addr=pbonzini@redhat.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 20 Jul 2018 08:04:26 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 20 Jul 2018 08:04:26 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'pbonzini@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 20/07/2018 05:53, Wanpeng Li wrote: >>> - ret = kvm_hypercall3(KVM_HC_SEND_IPI, ipi_bitmap_low, ipi_bitmap_high, vector); >>> + switch (vector) { >>> + default: >>> + icr = APIC_DM_FIXED | vector; >>> + break; >>> + case NMI_VECTOR: >>> + icr = APIC_DM_NMI; >> I think it would be better to say that KVM interprets NMI_VECTOR and >> sends the interrupt as APIC_DM_NMI. It's not KVM, this is arch/x86/kernel/kvm.c so the guest side. Paolo > Yeah, in addition, SDM 10.6.1 also mentioned that: > Delivery mode: > 100 (NMI) Delivers an NMI interrupt to the target processor or > processors. The vector information is ignored.