linux-kernel - Re: [PATCH 4/5] KVM: MMU: store generation-number into mmio spte

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Message-ID: <5146F830.1070602@redhat.com>
Date:	Mon, 18 Mar 2013 12:19:12 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 4/5] KVM: MMU: store generation-number into mmio spte

Il 15/03/2013 16:29, Xiao Guangrong ha scritto:
> +/*
> + * spte bits of bit 3 ~ bit 11 are used as low 9 bits of
> + * generation, the bits of bits 52 ~ bit 61 are used as
> + * high 12 bits of generation.
> + */

High 10 bits.

How often does the generation number change?  Especially with Takuya's
patches, using just 10 bits for the generation might be enough and
simplifies the code.

Paolo
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