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

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Message-ID: <20181123132641.712e2695@doriath>
Date:   Fri, 23 Nov 2018 13:26:41 -0500
From:   Luiz Capitulino <lcapitulino@...hat.com>
To:     Liran Alon <liran.alon@...cle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, 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>

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
> >   
>