linux-kernel - Re: [PATCH v9 01/12] acpi/ghes: add a firmware file with HEST address

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Message-ID: <20240911155108.190f0fdf@imammedo.users.ipa.redhat.com>
Date: Wed, 11 Sep 2024 15:51:08 +0200
From: Igor Mammedov <imammedo@...hat.com>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Ani Sinha <anisinha@...hat.com>,
 Dongjiu Geng <gengdongjiu1@...il.com>, linux-kernel@...r.kernel.org,
 qemu-arm@...gnu.org, qemu-devel@...gnu.org
Subject: Re: [PATCH v9 01/12] acpi/ghes: add a firmware file with HEST
 address

On Sun, 25 Aug 2024 05:45:56 +0200
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> Store HEST table address at GPA, placing its content at
> hest_addr_le variable.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

This looks good to me.

in addition to this, it needs a patch on top to make sure
that we migrate hest_addr_le.
See a08a64627b6b 'ACPI: Record the Generic Error Status Block address'
and fixes on top of that for an example.

> ---
> 
> Change from v8:
> - hest_addr_lr is now pointing to the error source size and data.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  hw/acpi/ghes.c         | 15 +++++++++++++++
>  include/hw/acpi/ghes.h |  1 +
>  2 files changed, 16 insertions(+)
> 
> diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> index e9511d9b8f71..529c14e3289f 100644
> --- a/hw/acpi/ghes.c
> +++ b/hw/acpi/ghes.c
> @@ -30,6 +30,7 @@
>  
>  #define ACPI_GHES_ERRORS_FW_CFG_FILE        "etc/hardware_errors"
>  #define ACPI_GHES_DATA_ADDR_FW_CFG_FILE     "etc/hardware_errors_addr"
> +#define ACPI_HEST_ADDR_FW_CFG_FILE          "etc/acpi_table_hest_addr"
>  
>  /* The max size in bytes for one error block */
>  #define ACPI_GHES_MAX_RAW_DATA_LENGTH   (1 * KiB)
> @@ -367,11 +368,22 @@ void acpi_build_hest(GArray *table_data, BIOSLinker *linker,
>  
>      acpi_table_begin(&table, table_data);
>  
> +    int hest_offset = table_data->len;
> +
>      /* Error Source Count */
>      build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4);
>      build_ghes_v2(table_data, ACPI_HEST_SRC_ID_SEA, linker);
>  
>      acpi_table_end(linker, &table);
> +
> +    /*
> +     * tell firmware to write into GPA the address of HEST via fw_cfg,
> +     * once initialized.
> +     */
> +    bios_linker_loader_write_pointer(linker,
> +                                     ACPI_HEST_ADDR_FW_CFG_FILE, 0,
> +                                     sizeof(uint64_t),
> +                                     ACPI_BUILD_TABLE_FILE, hest_offset);
>  }
>  
>  void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
> @@ -385,6 +397,9 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
>      fw_cfg_add_file_callback(s, ACPI_GHES_DATA_ADDR_FW_CFG_FILE, NULL, NULL,
>          NULL, &(ags->ghes_addr_le), sizeof(ags->ghes_addr_le), false);
>  
> +    fw_cfg_add_file_callback(s, ACPI_HEST_ADDR_FW_CFG_FILE, NULL, NULL,
> +        NULL, &(ags->hest_addr_le), sizeof(ags->hest_addr_le), false);
> +
>      ags->present = true;
>  }
>  
> diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
> index 674f6958e905..28b956acb19a 100644
> --- a/include/hw/acpi/ghes.h
> +++ b/include/hw/acpi/ghes.h
> @@ -63,6 +63,7 @@ enum {
>  };
>  
>  typedef struct AcpiGhesState {
> +    uint64_t hest_addr_le;
>      uint64_t ghes_addr_le;
>      bool present; /* True if GHES is present at all on this board */
>  } AcpiGhesState;