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

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Message-ID: <20120802131527.GE25344@amt.cnet>
Date:	Thu, 2 Aug 2012 10:15:27 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	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 Sun, Jul 29, 2012 at 04:14:25PM +0800, Xiao Guangrong wrote:
> Then, remove get_bad_pfn
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> ---
>  include/linux/kvm_host.h |    1 +
>  virt/kvm/kvm_main.c      |    7 +------
>  2 files changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 4de56cd..b02203f 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -50,6 +50,7 @@
> 
>  #define kvm_fault_pfn		(-EFAULT)
>  #define kvm_hwpoison_pfn	(-EHWPOISON)
> +#define kvm_bad_pfn		(-ENOENT)

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

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