Re: [Xen-devel] [PATCH v5 2/6] x86: allow reading MSR_IA32_TSC with XENPF_resource_op

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.01.15 at 13:53, <chao.p.peng@xxxxxxxxxxxxxxx> wrote:
> On Thu, Jan 22, 2015 at 11:20:15AM +0000, Jan Beulich wrote:
>> >>> On 21.01.15 at 12:19, <chao.p.peng@xxxxxxxxxxxxxxx> wrote:
>> > --- a/xen/arch/x86/platform_hypercall.c
>> > +++ b/xen/arch/x86/platform_hypercall.c
>> > @@ -61,7 +61,7 @@ long cpu_down_helper(void *data);
>> >  long core_parking_helper(void *data);
>> >  uint32_t get_cur_idle_nums(void);
>> >  
>> > -#define RESOURCE_ACCESS_MAX_ENTRIES 2
>> > +#define RESOURCE_ACCESS_MAX_ENTRIES 3
>> 
>> See my comment on an earlier version.
> The new added MSR_IA32_TSC and existed MSR_IA32_CMT_CTR should be
> read in an atomic unit. How to achieve this if not increase
> MAX_ENTRIES?

These are just two entries nevertheless.

Jan


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