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This is a preparation patch for adding support for VT-d PI related vCPU scheduling. ACRN does not support vCPU migration, one vCPU always runs on the same pCPU, so PI's ndst is never changed after startup. VCPUs of a VM won’t share same pCPU. So the maximum possible number of VCPUs that can run on a pCPU is CONFIG_MAX_VM_NUM. Allocate unique Activation Notification Vectors (ANV) for each vCPU that belongs to the same pCPU, the ANVs need only be unique within each pCPU, not across all vCPUs. This reduces # of pre-allocated ANVs for posted interrupts to CONFIG_MAX_VM_NUM, and enables ACRN to avoid switching between active and wake-up vector values in the posted interrupt descriptor on vCPU scheduling state changes. A total of CONFIG_MAX_VM_NUM consecutive IRQs/vectors are reserved for posted interrupts use. The code first initializes vcpu->arch.pid.control.bits.nv dynamically (will be added in subsequent patch), the other code shall use vcpu->arch.pid.control.bits.nv instead of the hard-coded notification vectors. Rename some functions: apicv_post_intr --> apicv_trigger_pi_anv posted_intr_notification --> handle_pi_notification setup_posted_intr_notification --> setup_pi_notification Tracked-On: #4506 Signed-off-by: dongshen <dongsheng.x.zhang@intel.com> Reviewed-by: Eddie Dong <eddie.dong@Intel.com> |
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