Re: [Xen-devel] [PATCH 2/2] xen: add update indicator to vcpu_runstate_info

[Juergen Gross <jgross@xxxxxxxx>]

On 20/05/16 15:34, Andrew Cooper wrote:
> On 20/05/16 14:22, Juergen Gross wrote:
>> diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
>> index 1365b4a..91f256b 100644
>> --- a/xen/arch/arm/domain.c
>> +++ b/xen/arch/arm/domain.c
>> @@ -239,10 +239,32 @@ static void ctxt_switch_to(struct vcpu *n)
>>  /* Update per-VCPU guest runstate shared memory area (if registered). */
>>  static void update_runstate_area(struct vcpu *v)
>>  {
>> +    bool_t update_flag;
>> +    void __user *guest_handle = NULL;
>> +    unsigned off = 0;
>> +
>>      if ( guest_handle_is_null(runstate_guest(v)) )
>>          return;
>>  
>> +    update_flag = VM_ASSIST(v->domain, runstate_update_flag);
>> +    if ( update_flag )
>> +    {
>> +        off = offsetof(struct vcpu_runstate_info, state_entry_time) + 7;
>> +        guest_handle = v->runstate_guest.p;
>> +        guest_handle += off;
>> +        v->runstate.state_entry_time |= XEN_RUNSTATE_UPDATE;
>> +        __raw_copy_to_guest(guest_handle, (void *)&v->runstate + off, 1);
>> +        wmb();
> 
> smp_wmb(), throughout.

Okay.


Juergen

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