linux-kernel - RE: [PATCH] KVM: VMX: re-add ple

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Date:   Wed, 28 Nov 2018 15:57:53 +0000
From:   "Moger, Babu" <Babu.Moger@....com>
To:     Luiz Capitulino <lcapitulino@...hat.com>,
        Liran Alon <liran.alon@...cle.com>
CC:     Paolo Bonzini <pbonzini@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] KVM: VMX: re-add ple_gap module parameter

My bad.. Sorry about this. I think this should also go to
stable@...r.kernel.org

> -----Original Message-----
> From: Luiz Capitulino <lcapitulino@...hat.com>
> Sent: Friday, November 23, 2018 12:27 PM
> To: Liran Alon <liran.alon@...cle.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>; Moger, Babu
> <Babu.Moger@....com>; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH] KVM: VMX: re-add ple_gap module parameter
> 
> On Fri, 23 Nov 2018 19:42:53 +0200
> Liran Alon <liran.alon@...cle.com> wrote:
> 
> > > On 23 Nov 2018, at 19:02, Luiz Capitulino <lcapitulino@...hat.com>
> wrote:
> > >
> > >
> > > Apparently, the ple_gap parameter was accidentally removed
> > > by commit c8e88717cfc6b36bedea22368d97667446318291. Add it
> > > back.
> > >
> > > Signed-off-by: Luiz Capitulino <lcapitulino@...hat.com>
> >
> > Weird that nobody noticed this when patch was applied… Thanks.
> > Reviewed-by: Liran Alon <liran.alon@...cle.com>
Reviewed-by: Babu Moger <babu.moger@....com>

> 
> I forgot to mention that I noticed this because I have systems
> disabling ple with ple_gap=0 in modprobe.conf. In those systems
> kvm_intel won't load anymore.
> 
> >
> > > ---
> > > arch/x86/kvm/vmx.c | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> > > index 4555077d69ce..be6f13f1c25f 100644
> > > --- a/arch/x86/kvm/vmx.c
> > > +++ b/arch/x86/kvm/vmx.c
> > > @@ -174,6 +174,7 @@ module_param_named(preemption_timer,
> enable_preemption_timer, bool, S_IRUGO);
> > >  * refer SDM volume 3b section 21.6.13 & 22.1.3.
> > >  */
> > > static unsigned int ple_gap = KVM_DEFAULT_PLE_GAP;
> > > +module_param(ple_gap, uint, 0444);
> > >
> > > static unsigned int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
> > > module_param(ple_window, uint, 0444);
> > > --
> > > 2.17.2
> > >
> >