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

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Message-ID: <20181128110300.49b3110d@doriath>
Date:   Wed, 28 Nov 2018 11:03:00 -0500
From:   Luiz Capitulino <lcapitulino@...hat.com>
To:     "Moger, Babu" <Babu.Moger@....com>
Cc:     Liran Alon <liran.alon@...cle.com>,
        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

On Wed, 28 Nov 2018 15:57:53 +0000
"Moger, Babu" <Babu.Moger@....com> wrote:

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

No problem man, this happens. Thanks for the review!

> 
> > -----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
> > > >  
> > >  
>