RE: [Xen-ia64-devel] [RFC][PATCH] [RESEND] support special guest optimisations in the hypervisor

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

>From: Dietmar Hahn [mailto:dietmar.hahn@xxxxxxxxxxxxxxxxxxx]
>Sent: 2007年7月5日 18:33
>To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Cc: Xu, Anthony; Alex Williamson
>Subject: Re: [Xen-ia64-devel] [RFC][PATCH] [RESEND] support special guest
>optimisations in the hypervisor
>
>Am Donnerstag, 5. Juli 2007 schrieb Dietmar Hahn:
>> Am Donnerstag, 5. Juli 2007 schrieb Xu, Anthony:
>> > I think you can do this way.
>> >
>> > A little concern,
>> > For dom0 & domU, pgprot and key are provided by guest, it is natural.
>> > While for HVM , pgprot and key are provided Xen, it is a little strange.
>>
>> Ok I understand, I will prepare a new patch.
>> Thanks.
>While thinking about the HVM part: should I only create an opt_feature
>#define OPTF_IDENT_MAP_HVM_REG4_5
>and simply replace the
>if (GOS_WINDOWS(v)
>by
>if (opt_feature & OPTF_IDENT_MAP_HVM_REG4_5)
>or should I do it the same way like on PV with setting pgprot and key
>(maybe this is overkill?) in the struct arch_domain and use these values
>during the optimization?
>Thanks.

Hi Dietmar,

I can understand you want to use the same interface for special guest 
Optimizations. While I think it is OK to use different interfaces for HVM and 
domU.
So I suggest HVM still use interface like GOS_WINDOWS(v), while domU uses 
opt_feature interface.

Thanks,
Anthony

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