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 71A17C4314A for ; Thu, 28 Jun 2018 15:13:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE5E224686 for ; Thu, 28 Jun 2018 15:04:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EE5E224686 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 S966966AbeF1PEg (ORCPT ); Thu, 28 Jun 2018 11:04:36 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:59334 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S964934AbeF1PEe (ORCPT ); Thu, 28 Jun 2018 11:04:34 -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 246744075741; Thu, 28 Jun 2018 15:04:34 +0000 (UTC) Received: from vitty.brq.redhat.com.redhat.com (unknown [10.43.2.155]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 634881116712; Thu, 28 Jun 2018 15:04:32 +0000 (UTC) From: Vitaly Kuznetsov To: Wanpeng Li Cc: Radim Krcmar , kvm , Paolo Bonzini , Roman Kagan , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , "Michael Kelley \(EOSG\)" , Mohammed Gamal , Cathy Avery , LKML Subject: Re: [PATCH 3/3] KVM: x86: hyperv: implement PV IPI send hypercalls References: <20180622145616.5851-1-vkuznets@redhat.com> <20180622145616.5851-4-vkuznets@redhat.com> <20180622191333.GC2377@flask> Date: Thu, 28 Jun 2018 17:04:31 +0200 In-Reply-To: (Wanpeng Li's message of "Thu, 28 Jun 2018 22:05:13 +0800") Message-ID: <87vaa3dkao.fsf@vitty.brq.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain 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 [10.11.55.7]); Thu, 28 Jun 2018 15:04:34 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Thu, 28 Jun 2018 15:04:34 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'vkuznets@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Wanpeng Li writes: > Hi Paolo and Radim, > > I have already completed the patches for linux guest/kvm/qemu w/ vCPUs > <= 64, however, extra complication as the ex in hyperv should be > introduced for vCPUs > 64, so do you think vCPU <=64 is enough for > linux guest or should me introduce two hypercall as what hyperv does > w/ ex logic? > Neither Paolo nor Radim but as we already have #define KVM_MAX_VCPUS 288 on at least x86, supporting <= 64 vCPUs seems to be too limiting for any new functionality. -- Vitaly