From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH 3/3] KVM: x86: hyperv: implement PV IPI send hypercalls
Date: Thu, 28 Jun 2018 17:04:31 +0200
Message-ID: <87vaa3dkao.fsf@vitty.brq.redhat.com>
References: <20180622145616.5851-1-vkuznets@redhat.com>
        <20180622145616.5851-4-vkuznets@redhat.com>
        <20180622191333.GC2377@flask>
        <CANRm+Cyj_Bw1nx=K9KDv7MDDdB--DxNAyRwFwCff_twXk1tPPg@mail.gmail.com>
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Cc: Radim Krcmar <rkrcmar@redhat.com>, kvm <kvm@vger.kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Roman Kagan <rkagan@virtuozzo.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "Michael Kelley \(EOSG\)" <Michael.H.Kelley@microsoft.com>,
        Mohammed Gamal <mmorsy@redhat.com>,
        Cathy Avery <cavery@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>
To: Wanpeng Li <kernellwp@gmail.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <CANRm+Cyj_Bw1nx=K9KDv7MDDdB--DxNAyRwFwCff_twXk1tPPg@mail.gmail.com>
        (Wanpeng Li's message of "Thu, 28 Jun 2018 22:05:13 +0800")
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

Wanpeng Li <kernellwp@gmail.com> 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