[Xen-devel] [PATCH] Don't enable irq for machine check vmexit

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

We should not enable irq for machine check VMExit

In changeset 18658:824892134573, IRQ is enabled during VMExit except external 
interrupt. The exception should apply for machine check also, because :
a) The mce_logout_lock should be held in irq_disabled context.
b) The machine check event should be handled as quickly as possible, enable irq 
will increase the period greatly.

Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>

This is in hotspot code path, I try to use unlikely, hope to reduce the 
performance impact

Thanks
Yunhong Jiang


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