linux-kernel - Re: [PATCH 02/18] KVM: MMU: Make tdp

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Message-ID: <20100310144426.GK5619@amd.com>
Date:	Wed, 10 Mar 2010 15:44:27 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/18] KVM: MMU: Make tdp_enabled a mmu-context
 parameter

On Mon, Mar 08, 2010 at 11:17:41AM +0200, Avi Kivity wrote:
> On 03/03/2010 09:12 PM, Joerg Roedel wrote:
> >This patch changes the tdp_enabled flag from its global
> >meaning to the mmu-context. This is necessary for Nested SVM
> >with emulation of Nested Paging where we need an extra MMU
> >context to shadow the Nested Nested Page Table.
> >
> >
> >diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> >index ec891a2..e7bef19 100644
> >--- a/arch/x86/include/asm/kvm_host.h
> >+++ b/arch/x86/include/asm/kvm_host.h
> >@@ -254,6 +254,7 @@ struct kvm_mmu {
> >  	int root_level;
> >  	int shadow_root_level;
> >  	union kvm_mmu_page_role base_role;
> >+	bool tdp_enabled;
> >
> 
> This needs a different name, since the old one is still around.
> Perhaps we could call it parent_mmu and make it a kvm_mmu pointer.

Hmm, how about renaming the global tdp_enabled variable to tdp_usable?
The global variable indicates if tdp is _usable_ and we can _enable_ it
for a mmu context.

	Joerg


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