[Xen-ia64-devel] [PATCH] emulate PAL_HALT_LIGHT on domU

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

Hi, All

This patch emulates Guest PAL_HALT_LIGHT on domU by using do_block and timer.
It also adds the function of the timer event sending to domU at the vcpu woke 
up.

Signed-off-by: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>


About the timer event sending to domU

The function "xen_timer_interrupt" on ParaVM/IA64 only sends 
the timer signal to current vcpu.
When the idle domain is running, no domUx receives timer signal.
If some domain cannot receive the timer signal during 10 secs,
a message "BUG: soft lockup detected appeared" comes from domUx.
To avoid this, I add a timer check routine at the vcpu woke up.

I tested a few days.

Thanks,
Atsushi SAKAI

Attachment: domupal_halt_light.patch
Description: Binary data

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