Re: [Xen-devel] [PATCH] Nested VMX: load current_vmcs only when it exists

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 09/05/14 06:53, Tian, Kevin wrote:
>> From: Zhang, Yang Z
>> Sent: Friday, May 09, 2014 12:56 PM
>>
>> From: Yang Zhang <yang.z.zhang@xxxxxxxxx>
>>
>> There may not have valid vmcs on current CPU. So only load it when it exists.
>>
>> This original fixing is from Edmud <edmund.h.white@xxxxxxxxx>.
>>
>> Signed-off-by: Edmund H White <edmund.h.white@xxxxxxxxx>
>> Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

>
>> ---
>>  xen/arch/x86/hvm/vmx/vmcs.c |    6 +++++-
>>  1 files changed, 5 insertions(+), 1 deletions(-)
>>
>> diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
>> index cc84ca2..7564895 100644
>> --- a/xen/arch/x86/hvm/vmx/vmcs.c
>> +++ b/xen/arch/x86/hvm/vmx/vmcs.c
>> @@ -824,8 +824,12 @@ void virtual_vmcs_enter(void *vvmcs)
>>
>>  void virtual_vmcs_exit(void *vvmcs)
>>  {
>> +    struct vmcs_struct *cur = this_cpu(current_vmcs);
>> +
>>      __vmpclear(pfn_to_paddr(domain_page_map_to_mfn(vvmcs)));
>> -    __vmptrld(virt_to_maddr(this_cpu(current_vmcs)));
>> +    if ( cur )
>> +        __vmptrld(virt_to_maddr(cur));
>> +
>>  }
>>
>>  u64 virtual_vmcs_vmread(void *vvmcs, u32 vmcs_encoding)
>> --
>> 1.7.1
>
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