Re: [Qemu-devel] [PATCH v2 07/12] i2c:pm_smbus: Fix state transfer

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* minyard@acm.org (minyard@acm.org) wrote:
> From: Corey Minyard <cminyard@mvista.com>
> 
> Transfer the state information for the SMBus registers and
> internal data so it will work on a VM transfer.
> 
> Signed-off-by: Corey Minyard <cminyard@mvista.com>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
>  hw/acpi/piix4.c           |  3 ++-
>  hw/i2c/pm_smbus.c         | 31 +++++++++++++++++++++++++++++++
>  hw/i2c/smbus_ich9.c       |  6 ++++--
>  include/hw/i2c/pm_smbus.h |  2 ++
>  4 files changed, 39 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> index e330f24c71..313305f5a0 100644
> --- a/hw/acpi/piix4.c
> +++ b/hw/acpi/piix4.c
> @@ -309,7 +309,7 @@ static const VMStateDescription vmstate_cpuhp_state = {
>   */
>  static const VMStateDescription vmstate_acpi = {
>      .name = "piix4_pm",
> -    .version_id = 3,
> +    .version_id = 4,

OK, so do we need to bump this version ?  Ideally you'd keep the version
as is and let the needed do the work.

>      .minimum_version_id = 3,
>      .minimum_version_id_old = 1,
>      .load_state_old = acpi_load_old,
> @@ -320,6 +320,7 @@ static const VMStateDescription vmstate_acpi = {
>          VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
>          VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
>          VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
> +        VMSTATE_STRUCT(smb, PIIX4PMState, 4, pmsmb_vmstate, PMSMBus),
>          VMSTATE_TIMER_PTR(ar.tmr.timer, PIIX4PMState),
>          VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
>          VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
> diff --git a/hw/i2c/pm_smbus.c b/hw/i2c/pm_smbus.c
> index 8793113c25..75907e1c22 100644
> --- a/hw/i2c/pm_smbus.c
> +++ b/hw/i2c/pm_smbus.c
> @@ -19,6 +19,7 @@
>   */
>  #include "qemu/osdep.h"
>  #include "hw/hw.h"
> +#include "hw/boards.h"
>  #include "hw/i2c/pm_smbus.h"
>  #include "hw/i2c/smbus_master.h"
>  
> @@ -450,6 +451,36 @@ static const MemoryRegionOps pm_smbus_ops = {
>      .endianness = DEVICE_LITTLE_ENDIAN,
>  };
>  
> +static bool pm_smbus_vmstate_needed(void *opaque)
> +{
> +    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
> +
> +    return !mc->smbus_no_migration_support;
> +}

OK

> +const VMStateDescription pmsmb_vmstate = {
> +    .name = "pmsmb",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .needed = pm_smbus_vmstate_needed,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_UINT8(smb_stat, PMSMBus),
> +        VMSTATE_UINT8(smb_ctl, PMSMBus),
> +        VMSTATE_UINT8(smb_cmd, PMSMBus),
> +        VMSTATE_UINT8(smb_addr, PMSMBus),
> +        VMSTATE_UINT8(smb_data0, PMSMBus),
> +        VMSTATE_UINT8(smb_data1, PMSMBus),
> +        VMSTATE_UINT32(smb_index, PMSMBus),
> +        VMSTATE_UINT8_ARRAY(smb_data, PMSMBus, PM_SMBUS_MAX_MSG_SIZE),
> +        VMSTATE_UINT8(smb_auxctl, PMSMBus),
> +        VMSTATE_BOOL(i2c_enable, PMSMBus),
> +        VMSTATE_BOOL(op_done, PMSMBus),
> +        VMSTATE_BOOL(in_i2c_block_read, PMSMBus),
> +        VMSTATE_BOOL(start_transaction_on_status_read, PMSMBus),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
>  void pm_smbus_init(DeviceState *parent, PMSMBus *smb, bool force_aux_blk)
>  {
>      smb->op_done = true;
> diff --git a/hw/i2c/smbus_ich9.c b/hw/i2c/smbus_ich9.c
> index e6d8d28194..c9b7482a54 100644
> --- a/hw/i2c/smbus_ich9.c
> +++ b/hw/i2c/smbus_ich9.c
> @@ -45,10 +45,12 @@ typedef struct ICH9SMBState {
>  
>  static const VMStateDescription vmstate_ich9_smbus = {
>      .name = "ich9_smb",
> -    .version_id = 1,
> +    .version_id = 2,

Again, do we need to bump this?

>      .minimum_version_id = 1,
>      .fields = (VMStateField[]) {
> -        VMSTATE_PCI_DEVICE(dev, struct ICH9SMBState),
> +        VMSTATE_PCI_DEVICE(dev, ICH9SMBState),
> +        VMSTATE_BOOL_V(irq_enabled, ICH9SMBState, 2),

Can we make this a VMSTATE_BOOL_TEST (see VMSTATE_UINT64_TEST for the
pattern) tied to the same .neede, and again we don't need to bump the
version.

> +        VMSTATE_STRUCT(smb, ICH9SMBState, 2, pmsmb_vmstate, PMSMBus),

So that's taken care of by the .needed.

Dave

>          VMSTATE_END_OF_LIST()
>      }
>  };
> diff --git a/include/hw/i2c/pm_smbus.h b/include/hw/i2c/pm_smbus.h
> index 7bcca97672..5075fc64fa 100644
> --- a/include/hw/i2c/pm_smbus.h
> +++ b/include/hw/i2c/pm_smbus.h
> @@ -43,4 +43,6 @@ typedef struct PMSMBus {
>  
>  void pm_smbus_init(DeviceState *parent, PMSMBus *smb, bool force_aux_blk);
>  
> +extern const VMStateDescription pmsmb_vmstate;
> +
>  #endif /* PM_SMBUS_H */
> -- 
> 2.17.1
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK