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

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Message-ID: <MW2PR2101MB111321A223A1A94D10ACA66EA04F0@MW2PR2101MB1113.namprd21.prod.outlook.com>
Date:   Thu, 28 Jun 2018 15:06:01 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        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>,
        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



> -----Original Message-----
> From: Vitaly Kuznetsov <vkuznets@...hat.com>
> Sent: Thursday, June 28, 2018 8:05 AM
> 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>; KY 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.

Agreed.

K. Y
> 
> --
>   Vitaly