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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/include/arch/x86/guest/vcpu.h
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@@ -131,12 +131,11 @@
if (vcpu->state != VCPU_OFFLINE)
enum vcpu_state {
VCPU_OFFLINE = 0U,
VCPU_INIT,
VCPU_RUNNING,
VCPU_PAUSED,
VCPU_ZOMBIE,
VCPU_OFFLINE,
VCPU_UNKNOWN_STATE,
};
enum vm_cpu_mode {
@@ -626,9 +625,9 @@ void pause_vcpu(struct acrn_vcpu *vcpu, enum vcpu_state new_state);
*
* @param[inout] vcpu pointer to vcpu data structure
*
* @return None
* @return 0 on success, -1 on failure.
*/
void resume_vcpu(struct acrn_vcpu *vcpu);
int32_t resume_vcpu(struct acrn_vcpu *vcpu);
/**
* @brief set the vcpu to running state, then it will be scheculed.