linux-kernel - Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler

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Message-ID: <20121003141739.GA15253@linux.vnet.ibm.com>
Date:	Wed, 3 Oct 2012 19:47:40 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Gleb Natapov <gleb@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Jiannan Ouyang <ouyang@...pitt.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	KVM <kvm@...r.kernel.org>, chegu vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>
Subject: Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE
 handler

* Avi Kivity <avi@...hat.com> [2012-09-30 13:13:09]:

> On 09/30/2012 01:07 PM, Gleb Natapov wrote:
> > On Sun, Sep 30, 2012 at 10:18:17AM +0200, Avi Kivity wrote:
> >> On 09/28/2012 08:16 AM, Raghavendra K T wrote:
> >> > 
> >> >>
> >> >>     +struct pv_sched_info {
> >> >>     +       unsigned long   sched_bitmap;
> >> > 
> >> > Thinking, whether we need something similar to cpumask here?
> >> > Only thing is we are representing guest (v)cpumask.
> >> > 
> >> 
> >> DECLARE_BITMAP(sched_bitmap, KVM_MAX_VCPUS)
> >> 
> > vcpu_id can be greater than KVM_MAX_VCPUS.
> 
> Use the index into the vcpu table as the bitmap index then.  In fact
> it's better because then the lookup to get the vcpu pointer is trivial.

Did you mean, while setting the bitmap,

we should do 
for (i = 1..n)
if (kvm->vcpus[i] == vcpu) set ith position in bitmap?

I just wanted to know whether there is any easy way to convert from 
vcpu  pointer to index in kvm vcpu table.

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