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hv: maintain a per-pCPU array of vCPUs and handle posted interrupt IRQs

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Maintain a per-pCPU array of vCPUs (struct acrn_vcpu *vcpu_array[CONFIG_MAX_VM_NUM]),
one VM cannot have multiple vCPUs share one pcpu, so we can utilize this property
and use the containing VM's vm_id as the index to the vCPU array:

 In create_vcpu(), we simply do:
   per_cpu(vcpu_array, pcpu_id)[vm->vm_id] = vcpu;

 In offline_vcpu():
   per_cpu(vcpu_array, pcpuid_from_vcpu(vcpu))[vcpu->vm->vm_id] = NULL;

so basically we use the containing VM's vm_id as the index to the vCPU array,
as well as the index of posted interrupt IRQ/vector pair that are assigned
to this vCPU:
  0: first vCPU and first posted interrupt IRQs/vector pair
  (POSTED_INTR_IRQ/POSTED_INTR_VECTOR)
  ...
  CONFIG_MAX_VM_NUM-1: last vCPU and last posted interrupt IRQs/vector pair
  ((POSTED_INTR_IRQ + CONFIG_MAX_VM_NUM - 1U)/(POSTED_INTR_VECTOR + CONFIG_MAX_VM_NUM - 1U)

In the posted interrupt handler, it will do the following:
 Translate the IRQ into a zero based index of where the vCPU
 is located in the vCPU list for current pCPU. Once the
 vCPU is found, we wake up the waiting thread and record
 this request as ACRN_REQUEST_EVENT

Tracked-On: #4506
Signed-off-by: dongshen <dongsheng.x.zhang@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@Intel.com>
Signed-off-by: dongshen <dongsheng.x.zhang@intel.com>
This commit is contained in:
dongshen
2020-04-07 18:38:01 -07:00
committed by wenlingz
parent 14fa9c563c
commit 00ad3863a1
4 changed files with 97 additions and 4 deletions
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8
hypervisor/include/arch/x86/per_cpu.h
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@@ -59,6 +59,14 @@ struct per_cpu_region {
#endif
uint16_t shutdown_vm_id;
uint64_t tsc_suspend;
/*
* We maintain a per-pCPU array of vCPUs. vCPUs of a VM won't
* share same pCPU. So the maximum possible # of vCPUs that can
* run on a pCPU is CONFIG_MAX_VM_NUM.
* vcpu_array address must be aligned to 64-bit for atomic access
* to avoid contention between offline_vcpu and posted interrupt handler
*/
struct acrn_vcpu *vcpu_array[CONFIG_MAX_VM_NUM] __aligned(8);
} __aligned(PAGE_SIZE); /* per_cpu_region size aligned with PAGE_SIZE */
extern struct per_cpu_region per_cpu_data[MAX_PCPU_NUM];