[Xen-ia64-devel] [PATCH] fixed some bugs to make xen0 more stable

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

Dan,

When we debugged VTIdomainN, we found and fixed some bugs.
This patch is based on ver 7332

- Consistence of region id mangling algrithm:
    - Metaphysical RID is not mangled, which may conflict with other
domain's virtual RID
    - Sometimes rr0 is mangled, but sometimes not
    - Sometimes only rid value is saved to saved_rr0_metaphysical, but
sometimes the whole value.

- Nat bit consumption happens but handled as priv_emulate to forward
progress.But this is definitely wrong. We found reason of nat
consumption from fast_rfi,which doesn't save unat again after spill
guest states, and then use guest unat to fill guest states when return.

- In some corner case, timer interrupt handler won't update itm and then
return directly. When that happens, machine timer interrupt disappears
until guest timer interrupt sets v_itm actively. But vti domain depends
on ac_timer while the latter will stop when above condition happens.
Then if current context is vti domain, context switch disappears and
machine halt.

Also many compatibility issues to support non-vti and vti domain are
solved,eg:
- Changing lazy PAL mapping switch to eager switch per domain switch,
since vti domain always depends on pal call.
- evtchn_notify should also vcpu_wake target domain, since vti domain
may block for io emulation. Xenolinux is free of this issue, since it's
always runnable.


Signed-off-by Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by Anthony Xu <anthony.xu@xxxxxxxxx>


Thanks
Anthony

Attachment: fix-some-bugs.patch
Description: fix-some-bugs.patch

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