linux-kernel - Re: [PATCH 3/3] KVM: x86: hyperv: implement PV IPI send hypercalls

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Message-ID: <87vaa3dkao.fsf@vitty.brq.redhat.com>
Date:   Thu, 28 Jun 2018 17:04:31 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     Radim Krcmar <rkrcmar@...hat.com>, kvm <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Roman Kagan <rkagan@...tuozzo.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley \(EOSG\)" <Michael.H.Kelley@...rosoft.com>,
        Mohammed Gamal <mmorsy@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] KVM: x86: hyperv: implement PV IPI send hypercalls

Wanpeng Li <kernellwp@...il.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