From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH][v2 3/3] VMX: x86: Only reset MMU when necessary
Date: Wed, 12 May 2010 11:56:27 +0300
Message-ID: <4BEA6D3B.5080700@redhat.com>
References: <1273653642-23132-1-git-send-email-sheng@linux.intel.com> <1273653642-23132-4-git-send-email-sheng@linux.intel.com> <4BEA6B28.9060404@redhat.com> <201005121654.34980.sheng@linux.intel.com>
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Cc: kvm-devel <kvm@vger.kernel.org>
To: Sheng Yang <sheng@linux.intel.com>
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On 05/12/2010 11:54 AM, Sheng Yang wrote:
> On Wednesday 12 May 2010 16:47:36 you wrote:
>    
>> On 05/12/2010 11:40 AM, Sheng Yang wrote:
>>      
>>> Only modifying some bits of CR0/CR4 needs paging mode switch.
>>>
>>> Modify EFER.NXE bit would result in reserved bit updates.
>>>
>>> Signed-off-by: Sheng Yang<sheng@linux.intel.com>
>>> ---
>>>
>>>    arch/x86/kvm/x86.c |   16 ++++++++++++++--
>>>    1 files changed, 14 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>>> index 764f89b..f442da2 100644
>>> --- a/arch/x86/kvm/x86.c
>>> +++ b/arch/x86/kvm/x86.c
>>>
>>> @@ -416,6 +416,10 @@ out:
>>>    static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
>>>    {
>>>
>>> +	unsigned long old_cr0 = kvm_read_cr0(vcpu);
>>> +	unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
>>> +				    X86_CR0_CD | X86_CR0_NW;
>>> +
>>>        
>> CR0_WP...
>>      
> ?
>
>    

Can't read, sorry.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.