RE: [Xen-ia64-devel] [PATCH] per vcpu vhpt

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

>> >non-current vcpu's case must be handled.
>> I don't see any issue here, if we use option1, we use identity
mapping
>> for VHPT, and so we can use 16 MB TR mapping, of cause, 64KB VHPT is
>> covered by this 16M TR.
>
>In fact I had such a patch for the very early version of
>the pervcpu vhpt patch.
>But I discarded it for some reason. I don't remember clearly why.
>Probably I wanted to avoid introducing an implicit dependency
>and increasing vcpu context switch overhead.

As I know, IA64/LINUX is using this mechanism, the task_struct is 32k,
but it uses 16M TR mapping if it is not covered 64M kernel TR.

Anthony


>
>--
>yamahata

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