linux-kernel - Re: [PATCH 05/12] KVM: SVM: Add clean-bit for interrupt state

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Message-ID: <20101207082349.GC29502@8bytes.org>
Date:	Tue, 7 Dec 2010 09:23:50 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Joerg Roedel <joerg.roedel@....com>, Avi Kivity <avi@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/12] KVM: SVM: Add clean-bit for interrupt state

On Mon, Dec 06, 2010 at 05:29:24PM -0200, Marcelo Tosatti wrote:
> On Fri, Dec 03, 2010 at 11:45:52AM +0100, Joerg Roedel wrote:
> > This patch implements the clean-bit for all interrupt
> > related state in the vmcb. This corresponds to vmcb offset
> > 0x60-0x67.
> > 
> > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> 
> Don't you have to mark dirty on sync_lapic_to_cr8?

In theory yes, but sync_lapic_to_cr8 is called in every vmexit/vmrun
cycle. Thats why I added the interrupt bit to the always-dirty mask. I
left this as a future optimization to only write cr8 to the vmcb when it
actually changes.

	Joerg

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