Re: [PATCH][v2 3/3] VMX: x86: Only reset MMU when necessary

[Avi Kivity <avi@redhat.com>]

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.