linux-kernel - Re: [PATCH 4/9] KVM: define kvm_bad

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Message-ID: <20120803000125.GB12559@bloggs.ozlabs.ibm.com>
Date:	Fri, 3 Aug 2012 10:01:25 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 4/9] KVM: define kvm_bad_pfn statically

On Thu, Aug 02, 2012 at 10:15:27AM -0300, Marcelo Tosatti wrote:

> Remind me what is the guarantee that -Exxx does not clash with
> a valid pfn number?

A pfn number is an address >> PAGE_SHIFT, so it will have the top 12
(at least) bits clear, whereas -Exxx will have the top bit set.

Paul.
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