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Akio Takebe escreveu:
> Hi, Glauber
>
> This is interesting facility. :-)
>
>> +#define KVM_HCALL_REGISTER_CLOCK 1
>> +
>> +union kvm_hv_clock {
>> + struct {
>> + u64 tsc_mult;
>> + u64 now_ns;
>> + /* That's the wall clock, not the water closet */
>> + u64 wc_sec;
>> + u64 wc_nsec;
>> + u64 last_tsc;
>> + /* At first, we could use the tsc value as a marker, but Jeremy
>> + * well noted that it will cause us locking problems in 32-bit
>> + * sys, so we have a special version field */
>> + u32 version;
>> + };
>> + char page_align[PAGE_SIZE];
>> +};
>> +
> Why does kvm_hv_clock need page_align?
Each vcpu will register a page on its own. In the guest side, it will be
an array of pages. So, we make it page sized.
> And also the kvm_hv_clock is alloced with kvm_vcpu,
There's no requirements on the host part at all. So it doesn't really
matter. In the next version, I may make it even a simple pointer.
> so the align is not enough, isn't it?
> I thik __atribute__((__aligne__(PAGE_SIZE)))) is better than it.
It deals with the start of the structure, but not with its size. See the
guest part: Where it matters, I do use it.
Thanks
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