Re: [Xen-devel] [PATCH] tools/libxc: Improve efficiency of xc_cpuid_apply_policy()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 07/10/15 12:52, Ian Campbell wrote:
> On Tue, 2015-10-06 at 10:14 +0100, Wei Liu wrote:
>> On Mon, Oct 05, 2015 at 02:12:17PM +0100, Andrew Cooper wrote:
>>> Having the internals of xc_cpuid_policy() make hypercalls to collect
>>> domain
>>> information causes xc_cpuid_apply_policy() to be very inefficient.
>>>
>>> Re-order operations to collect all information at once at the outermost
>>> layer,
>>> and pass a structure in to all cpuid policy generation functions.
>>>
>>> This removes several hypercalls (4 from HVM, 3 from PV) for each of the
>>> up-to 108 leaves processed.
>>>
>>> No change in the eventual policy provided, although all the information
>>> gathering how has (or has correct) error checking.
>>>
>>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> ---
>>> CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
>>> CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
>>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> Applied.
>
>>> +    /* PV-only information. */
>>> +    bool pv64;
>>> +
>>> +    /* HVM-only infomation. */
> Typo fixed

Oops - thanks.

>
>
>>> +    bool pae;
>>> +    bool nestedhvm;
>> I would have used union for these fields. But I don't want to bikeshed
>> too much on this. Definitely not a blocker for this patch. :-)
> Indeed.

It appears that I forgot to reply.  I have further work which removes
these, but they are not in a suitable state for the list yet.

~Andrew

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