[Xen-ia64-devel] [PATCH 0/3] [RFC] clean up priv_handle_op() and paravirtualise vdso

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

priv_handle_op() caused some troubles.
the 1/3 patch fixes them. However it causes performance loss
because vdso area always requires priv_handle_op() and itlb reflection.
System call enterance is performance critical so that it is
worthwhile for paravirtualization.
The 3/3 patch paravirtualizes it.

There are choices to paravirtualize vdso area for transparent virtualization.
A. add running_on_xen check to gate.S directly or
B. prepare two version of gate.S, and use appropriate version at setup.
However B. requires modification to additional several files.
So My current choice is option A.

Should we go for option B?

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