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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 55b148ab01
commit 655032e020
4 changed files with 13 additions and 2 deletions
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1
hypervisor/arch/x86/guest/vlapic.c
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@@ -590,6 +590,7 @@ static void vlapic_accept_intr(struct acrn_vlapic *vlapic, uint32_t vector, bool
if ((lapic->svr.v & APIC_SVR_ENABLE) == 0U) {
dev_dbg(ACRN_DBG_LAPIC, "vlapic is software disabled, ignoring interrupt %u", vector);
} else {
signal_event(&vlapic->vcpu->events[VCPU_EVENT_VIRTUAL_INTERRUPT]);
vlapic->ops->accept_intr(vlapic, vector, level);
}
}