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hv: HLT emulation in hypervisor

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HLT emulation is import to CPU resource maximum utilization. vcpu
doing HLT means it is idle and can give up CPU proactively. Thus, we
pause the vcpu thread in HLT emulation and resume it while event happens.

When vcpu enter HLT, its vcpu thread will sleep, but the vcpu state is
still 'Running'.

VM ID    PCPU ID    VCPU ID    VCPU ROLE    VCPU STATE
=====    =======    =======    =========    ==========
  0         0          0       PRIMARY      Running
  0         1          1       SECONDARY    Running

Tracked-On: #4329
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Shuo A Liu
2019-12-02 17:03:23 +08:00
committed by wenlingz
parent a8f6bdd479
commit 4303ccb1a0
4 changed files with 13 additions and 2 deletions
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1
hypervisor/common/hv_main.c
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@@ -40,6 +40,7 @@ void vcpu_thread(struct thread_object *obj)
continue;
}
reset_event(&vcpu->events[VCPU_EVENT_VIRTUAL_INTERRUPT]);
profiling_vmenter_handler(vcpu);
TRACE_2L(TRACE_VM_ENTER, 0UL, 0UL);