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Now that setting vCPU affinity is guarded with ir_list_lock, i.e. now that avic_physical_id_entry can be safely accessed, set the pCPU info straight-away when setting vCPU affinity. Putting the IRTE into posted mode, and then immediately updating the IRTE a second time if the target vCPU is running is wasteful and confusing. This also fixes a flaw where a posted IRQ that arrives between putting the IRTE into guest_mode and setting the correct destination could cause the IOMMU to ring the doorbell on the wrong pCPU. Link: https://lore.kernel.org/r/20250611224604.313496-44-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>