Re: [PATCH v6 02/10] arm/virt: Wire up a GED error device for ACPI / GHES

[Igor Mammedov <imammedo@redhat.com>]

On Thu,  8 Aug 2024 14:26:28 +0200
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:

> Adds support to ARM virtualization to allow handling
> generic error ACPI Event via GED & error source device.
> 
> It is aligned with Linux Kernel patch:
> https://lore.kernel.org/lkml/1272350481-27951-8-git-send-email-ying.huang@intel.com/
> 
> Co-authored-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> Co-authored-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

other than question below mostly to arm/virt maintainers, LGTM
Acked-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  hw/acpi/ghes.c           |  3 +++
>  hw/arm/virt-acpi-build.c |  1 +
>  hw/arm/virt.c            | 12 +++++++++++-
>  include/hw/acpi/ghes.h   |  3 +++
>  include/hw/arm/virt.h    |  1 +
>  5 files changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> index e9511d9b8f71..13b105c5d02d 100644
> --- a/hw/acpi/ghes.c
> +++ b/hw/acpi/ghes.c
> @@ -444,6 +444,9 @@ int acpi_ghes_record_errors(uint8_t source_id, uint64_t physical_address)
>      return ret;
>  }
>  
> +NotifierList acpi_generic_error_notifiers =
> +    NOTIFIER_LIST_INITIALIZER(error_device_notifiers);
> +
>  bool acpi_ghes_present(void)
>  {
>      AcpiGedState *acpi_ged_state;
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index f76fb117adff..1769467d23b2 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -858,6 +858,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      }
>  
>      acpi_dsdt_add_power_button(scope);
> +    aml_append(scope, aml_error_device());
>  #ifdef CONFIG_TPM
>      acpi_dsdt_add_tpm(scope, vms);
>  #endif
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index 687fe0bb8bc9..22448e5c5b73 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -677,7 +677,7 @@ static inline DeviceState *create_acpi_ged(VirtMachineState *vms)
>      DeviceState *dev;
>      MachineState *ms = MACHINE(vms);
>      int irq = vms->irqmap[VIRT_ACPI_GED];
> -    uint32_t event = ACPI_GED_PWR_DOWN_EVT;
> +    uint32_t event = ACPI_GED_PWR_DOWN_EVT | ACPI_GED_ERROR_EVT;

given how often error injection would be used, does it make a sense
to make it always enabled? (it after all consumes guest RAM for
error block buffer)

Maybe we need to add a machine property to enable it when desired?
What arm/virt folk think?


>  
>      if (ms->ram_slots) {
>          event |= ACPI_GED_MEM_HOTPLUG_EVT;
> @@ -1009,6 +1009,13 @@ static void virt_powerdown_req(Notifier *n, void *opaque)
>      }
>  }
>  
> +static void virt_generic_error_req(Notifier *n, void *opaque)
> +{
> +    VirtMachineState *s = container_of(n, VirtMachineState, generic_error_notifier);
> +
> +    acpi_send_event(s->acpi_dev, ACPI_GENERIC_ERROR);
> +}
> +
>  static void create_gpio_keys(char *fdt, DeviceState *pl061_dev,
>                               uint32_t phandle)
>  {
> @@ -2385,6 +2392,9 @@ static void machvirt_init(MachineState *machine)
>  
>      if (has_ged && aarch64 && firmware_loaded && virt_is_acpi_enabled(vms)) {
>          vms->acpi_dev = create_acpi_ged(vms);
> +        vms->generic_error_notifier.notify = virt_generic_error_req;
> +        notifier_list_add(&acpi_generic_error_notifiers,
> +                          &vms->generic_error_notifier);
>      } else {
>          create_gpio_devices(vms, VIRT_GPIO, sysmem);
>      }
> diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
> index 674f6958e905..fb80897e7eac 100644
> --- a/include/hw/acpi/ghes.h
> +++ b/include/hw/acpi/ghes.h
> @@ -23,6 +23,9 @@
>  #define ACPI_GHES_H
>  
>  #include "hw/acpi/bios-linker-loader.h"
> +#include "qemu/notify.h"
> +
> +extern NotifierList acpi_generic_error_notifiers;
>  
>  /*
>   * Values for Hardware Error Notification Type field
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index a4d937ed45ac..ad9f6e94dcc5 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -175,6 +175,7 @@ struct VirtMachineState {
>      DeviceState *gic;
>      DeviceState *acpi_dev;
>      Notifier powerdown_notifier;
> +    Notifier generic_error_notifier;
>      PCIBus *bus;
>      char *oem_id;
>      char *oem_table_id;