linux-kernel - Re: [PATCH 13/15] KVM: VMX: modify the default value of nontrap shadow pte

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Date:	Thu, 09 Jun 2011 10:14:38 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 13/15] KVM: VMX: modify the default value of nontrap shadow
 pte

On 06/07/2011 04:06 PM, Xiao Guangrong wrote:
> Modify the default value to identify nontrap shadow pte and mmio shadow pte
> whill will be introduced in later patch
>
> Signed-off-by: Xiao Guangrong<xiaoguangrong@...fujitsu.com>
> ---
>   arch/x86/kvm/vmx.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 20dbf7f..8c3d343 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -7110,7 +7110,7 @@ static int __init vmx_init(void)
>   		kvm_disable_tdp();
>
>   	if (bypass_guest_pf)
> -		kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
> +		kvm_mmu_set_nonpresent_ptes(0xfull<<  49 | 1ull, 0ull);
>

This can break on newer processors (well, so can the original, but the 
new one will break earlier).

-- 
error compiling committee.c: too many arguments to function

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