Re: [PATCH V4 01/11] cpus: pass runstate to vm_prepare_start

[Peter Xu <peterx@redhat.com>]

On Tue, Aug 29, 2023 at 11:17:56AM -0700, Steve Sistare wrote:
> When a vm in the suspended state is migrated, we must call vm_prepare_start
> on the destination, so a later system_wakeup properly resumes the guest,
> when main_loop_should_exit callsresume_all_vcpus.  However, the runstate
> should remain suspended until system_wakeup is called, so allow the caller
> to pass the new state to vm_prepare_start, rather than assume the new state
> is RUN_STATE_RUNNING.  Modify vm state change handlers that check
> RUN_STATE_RUNNING to instead use the running parameter.
> 
> No functional change.
> 
> Suggested-by: Peter Xu <peterx@redhat.com>
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>

I think all the call sites should be covered indeed, via:

qemu_add_vm_change_state_handler_prio
    qdev_add_vm_change_state_handler
        virtio_blk_device_realize[1653] qdev_add_vm_change_state_handler(dev, virtio_blk_dma_restart_cb, s);
        scsi_qdev_realize[289]         dev->vmsentry = qdev_add_vm_change_state_handler(DEVICE(dev),
        vfio_migration_init[796]       migration->vm_state = qdev_add_vm_change_state_handler(vbasedev->dev,
        virtio_init[3189]              vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev),
    qemu_add_vm_change_state_handler
        xen_init[106]                  qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
        audio_init[1827]               e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
        tpm_emulator_inst_init[978]    qemu_add_vm_change_state_handler(tpm_emulator_vm_state_change,
        blk_root_activate[223]         blk->vmsh = qemu_add_vm_change_state_handler(blk_vm_state_changed,
        gdbserver_start[384]           qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
        pflash_post_load[1038]         pfl->vmstate = qemu_add_vm_change_state_handler(postload_update_cb,
        qxl_realize_common[2202]       qemu_add_vm_change_state_handler(qxl_vm_change_state_handler, qxl);
        kvmclock_realize[233]          qemu_add_vm_change_state_handler(kvmclock_vm_state_change, s);
        kvm_pit_realizefn[298]         qemu_add_vm_change_state_handler(kvm_pit_vm_state_change, s);
        vapic_post_load[796]           qemu_add_vm_change_state_handler(kvmvapic_vm_state_change, s);
        ide_bus_register_restart_cb[2767] bus->vmstate = qemu_add_vm_change_state_handler(ide_restart_cb, bus);
        kvm_arm_its_realize[122]       qemu_add_vm_change_state_handler(vm_change_state_handler, s);
        kvm_arm_gicv3_realize[888]     qemu_add_vm_change_state_handler(vm_change_state_handler, s);
        kvmppc_xive_connect[794]       xive->change = qemu_add_vm_change_state_handler(
        via1_post_load[971]            v1s->vmstate = qemu_add_vm_change_state_handler(
        e1000e_core_pci_realize[3379]  qemu_add_vm_change_state_handler(e1000e_vm_state_change, core);
        igb_core_pci_realize[4012]     core->vmstate = qemu_add_vm_change_state_handler(igb_vm_state_change, core);
        spapr_nvram_post_load[235]     nvram->vmstate = qemu_add_vm_change_state_handler(postload_update_cb,
        ppc_booke_timers_init[366]     qemu_add_vm_change_state_handler(cpu_state_change_handler, cpu);
        spapr_machine_init[3070]       qemu_add_vm_change_state_handler(cpu_ppc_clock_vm_state_change,
        kvm_s390_tod_realize[133]      qemu_add_vm_change_state_handler(kvm_s390_tod_vm_state_change, td);
        usb_ehci_realize[2540]         s->vmstate = qemu_add_vm_change_state_handler(usb_ehci_vm_state_change, s);
        usb_host_auto_check[1912]      usb_vmstate = qemu_add_vm_change_state_handler(usb_host_vm_state, NULL);
        usbredir_realize[1466]         qemu_add_vm_change_state_handler(usbredir_vm_state_change, dev);
        virtio_rng_device_realize[226] vrng->vmstate = qemu_add_vm_change_state_handler(virtio_rng_vm_state_change,
        xen_do_ioreq_register[825]     qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state);
        net_init_clients[1644]         qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
        memory_global_dirty_log_stop[2978] vmstate_change = qemu_add_vm_change_state_handler(
        hvf_arch_init[2036]            qemu_add_vm_change_state_handler(hvf_vm_state_change, &vtimer);
        kvm_arch_init_vcpu[567]        qemu_add_vm_change_state_handler(kvm_arm_vm_state_change, cs);
        kvm_arch_init_vcpu[2191]       cpu->vmsentry = qemu_add_vm_change_state_handler(cpu_update_state, env);
        sev_kvm_init[1014]             qemu_add_vm_change_state_handler(sev_vm_state_change, sev);
        whpx_init_vcpu[2248]           qemu_add_vm_change_state_handler(whpx_cpu_update_state, cpu->env_ptr);
        kvm_arch_init_vcpu[70]         qemu_add_vm_change_state_handler(kvm_mips_update_state, cs);
        kvm_arch_init_vcpu[891]        qemu_add_vm_change_state_handler(kvm_riscv_vm_state_change, cs);
        gtk_display_init[2410]         qemu_add_vm_change_state_handler(gd_change_runstate, s);
        qemu_spice_display_init_done[651] qemu_add_vm_change_state_handler(vm_change_state_handler, NULL);
        qemu_spice_add_interface[868]  qemu_add_vm_change_state_handler(vm_change_state_handler, NULL);

Looks all correct:

Reviewed-by: Peter Xu <peterx@redhat.com>

-- 
Peter Xu