linux-kernel - Re: [PATCH v3 03/14] acpi/ghes: Use HEST table offsets when preparing GHES records

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Message-ID: <20250203104227.000047b3@huawei.com>
Date: Mon, 3 Feb 2025 10:42:27 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
CC: Igor Mammedov <imammedo@...hat.com>, "Michael S . Tsirkin"
	<mst@...hat.com>, Shiju Jose <shiju.jose@...wei.com>, <qemu-arm@...gnu.org>,
	<qemu-devel@...gnu.org>, Ani Sinha <anisinha@...hat.com>, Dongjiu Geng
	<gengdongjiu1@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 03/14] acpi/ghes: Use HEST table offsets when
 preparing GHES records

On Fri, 31 Jan 2025 18:42:44 +0100
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> There are two pointers that are needed during error injection:
> 
> 1. The start address of the CPER block to be stored;
> 2. The address of the ack.
> 
> It is preferable to calculate them from the HEST table.  This allows
> checking the source ID, the size of the table and the type of the
> HEST error block structures.
> 
> Yet, keep the old code, as this is needed for migration purposes.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Tiny niggle on patch split up inline.  Either way

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> @@ -212,14 +237,6 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker,
>  {
>      int i, error_status_block_offset;
>  
> -    /*
> -     * TODO: Current version supports only one source.
> -     * A further patch will drop this check, after adding a proper migration
> -     * code, as, for the code to work, we need to store a bios pointer to the
> -     * HEST table.
> -     */
> -    assert(num_sources == 1);
> -
>      /* Build error_block_address */
>      for (i = 0; i < num_sources; i++) {
>          build_append_int_noprefix(hardware_errors, 0, sizeof(uint64_t));
> @@ -352,6 +369,14 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
>                          .oem_id = oem_id, .oem_table_id = oem_table_id };
>      uint32_t hest_offset;
>      int i;
> +    AcpiGedState *acpi_ged_state;
> +    AcpiGhesState *ags = NULL;
> +
> +    acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
> +                                                       NULL));
> +    if (acpi_ged_state) {
> +        ags = &acpi_ged_state->ghes_state;
> +    }
>  
>      hest_offset = table_data->len;
>  
> @@ -371,10 +396,12 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
>       * 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);
> +    if (ags->use_hest_addr) {

Maybe move ags->use_hest_addr introduction to previous patch to avoid
churn here?  It's not set yet anyway.

> +        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,
> @@ -420,6 +447,78 @@ static void get_hw_error_offsets(uint64_t ghes_addr,
>      *read_ack_register_addr = ghes_addr + sizeof(uint64_t);
>  }