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HV: ensure valid vcpu state transition

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The vcpu state machine transition should follow below rule:

old vcpu state                              new vcpu state
==============                              ==============
VCPU_OFFLINE         --- create_vcpu -->    VCPU_INIT
VCPU_INIT            --- launch_vcpu -->    VCPU_RUNNING
VCPU_RUNNING         ---  pause_vcpu -->    VCPU_PAUSED
VCPU_PAUSED          --- resume_vcpu -->    VCPU_RUNNING
VCPU_RUNNING/PAUSED  ---  pause_vcpu -->    VCPU_ZOMBIE
VCPU_INIT            ---  pause_vcpu -->    VCPU_ZOMBIE
VCPU_ZOMBIE          ---  reset_vcpu -->    VCPU_INIT
VCPU_ZOMBIE          --- offline_vcpu-->    VCPU_OFFLINE

Tracked-On: #4267

Signed-off-by: Victor Sun <victor.sun@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Victor Sun
2019-12-25 14:26:54 +08:00
committed by wenlingz
parent a5158e2c16
commit ab13228591
4 changed files with 43 additions and 32 deletions
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7
hypervisor/common/hypercall.c
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@@ -552,11 +552,8 @@ int32_t hcall_notify_ioreq_finish(uint16_t vmid, uint16_t vcpu_id)
__func__, vcpu_id, target_vm->vm_id);
} else {
vcpu = vcpu_from_vid(target_vm, vcpu_id);
if (vcpu->state == VCPU_PAUSED) {
if (!vcpu->vm->sw.is_completion_polling) {
resume_vcpu(vcpu);
}
ret = 0;
if (!vcpu->vm->sw.is_completion_polling) {
ret = resume_vcpu(vcpu);
}
}
}