linux-kernel - Re: [PATCH 2/5] KVM: SVM: Optimize nested svm msrpm merging

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Date:	Fri, 26 Feb 2010 15:59:22 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Alexander Graf <agraf@...e.de>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] KVM: SVM: Optimize nested svm msrpm merging

On 02/26/2010 03:30 PM, Joerg Roedel wrote:
>
>> So the msrpm bitmap changes dynamically for each vcpu? Great, make it
>> fully dynamic then, changing the vcpu->arch.msrpm only from within its
>> vcpu context. No need for atomic ops.
>>      
> The msrpm_offsets table is global. But I think I will follow Avis
> suggestions and create a static direct_access_msrs list and generate the
> msrpm_offsets at module_init. This solves the problem of two independent
> lists too.
>
>    

But with LBR virt, maybe a fully dynamic approach is better.  Just have 
static lists for updating the msrpm and offset table dynamically.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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