-----Original Message----- From: Xu, Anthony [mailto:anth...@intel.com] Sent: Thursday, October 13, 2005 3:28 AM To: Magenheimer, Dan (HP Labs Fort Collins) Cc: xen-...@lists.xensource.com Subject: [Xen-ia64-devel] [PATCH] fixed some bugs to make xen0 more stable

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 <kevi...@intel.com> Signed-off-by Anthony Xu <anth...@intel.com>

Thanks Anthony