linux-kernel - Re: [PATCH 10/11] qapi/acpi-hest: add an interface to do generic CPER error injection

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Message-ID: <20250123110032.000052d4@huawei.com>
Date: Thu, 23 Jan 2025 11:00:32 +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>, Eric Blake <eblake@...hat.com>, Markus Armbruster
	<armbru@...hat.com>, Michael Roth <michael.roth@....com>, Paolo Bonzini
	<pbonzini@...hat.com>, Peter Maydell <peter.maydell@...aro.org>, "Shannon
 Zhao" <shannon.zhaosl@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/11] qapi/acpi-hest: add an interface to do generic
 CPER error injection

On Wed, 22 Jan 2025 16:46:27 +0100
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:

> Creates a QMP command to be used for generic ACPI APEI hardware error
> injection (HEST) via GHESv2, and add support for it for ARM guests.
> 
> Error injection uses ACPI_HEST_SRC_ID_QMP source ID to be platform
> independent. This is mapped at arch virt bindings, depending on the
> types supported by QEMU and by the BIOS. So, on ARM, this is supported
> via ACPI_GHES_NOTIFY_GPIO notification type.
> 
> This patch is co-authored:
>     - original ghes logic to inject a simple ARM record by Shiju Jose;
>     - generic logic to handle block addresses by Jonathan Cameron;
>     - generic GHESv2 error inject by Mauro Carvalho Chehab;
> 
> Co-authored-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Co-authored-by: Shiju Jose <shiju.jose@...wei.com>
> Co-authored-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> 
> ---
> 
> Changes since v9:
> - ARM source IDs renamed to reflect SYNC/ASYNC;
> - command name changed to better reflect what it does;
> - some improvements at JSON documentation;
> - add a check for QMP source at the notification logic.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Another bonus.

Few trivial formatting comments, otherwise looks fine to me.

Jonathan

> diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> index 5d29db3918dd..cf83c959b5ef 100644
> --- a/hw/acpi/ghes.c
> +++ b/hw/acpi/ghes.c
> @@ -547,7 +547,7 @@ void ghes_record_cper_errors(const void *cper, size_t len,
>      /* Write the generic error data entry into guest memory */
>      cpu_physical_memory_write(cper_addr, cper, len);
>  
> -    notifier_list_notify(&acpi_generic_error_notifiers, NULL);
> +    notifier_list_notify(&acpi_generic_error_notifiers, &source_id);
>  }
>  
>  int acpi_ghes_memory_errors(uint16_t source_id, uint64_t physical_address)
> diff --git a/hw/acpi/ghes_cper.c b/hw/acpi/ghes_cper.c
> new file mode 100644
> index 000000000000..02c47b41b990
> --- /dev/null
> +++ b/hw/acpi/ghes_cper.c
> @@ -0,0 +1,32 @@
> +/*
> + * CPER payload parser for error injection
> + *
> + * Copyright(C) 2024 Huawei LTD.
> + *
> + * This code is licensed under the GPL version 2 or later. See the
> + * COPYING file in the top-level directory.
> + *
> + */
> +
> +#include "qemu/osdep.h"
> +
> +#include "qemu/base64.h"
> +#include "qemu/error-report.h"
> +#include "qemu/uuid.h"
> +#include "qapi/qapi-commands-acpi-hest.h"
> +#include "hw/acpi/ghes.h"
> +
> +void qmp_inject_ghes_error(const char *qmp_cper, Error **errp)
> +{
> +
Odd blank line that can go.

> +    uint8_t *cper;
> +    size_t  len;
> +
> +    cper = qbase64_decode(qmp_cper, -1, &len, errp);
> +    if (!cper) {
> +        error_setg(errp, "missing GHES CPER payload");
> +        return;
> +    }
> +
> +    ghes_record_cper_errors(cper, len, ACPI_HEST_SRC_ID_QMP, errp);
> +}
> diff --git a/hw/acpi/ghes_cper_stub.c b/hw/acpi/ghes_cper_stub.c
> new file mode 100644
> index 000000000000..8782e2c02fa8
> --- /dev/null
> +++ b/hw/acpi/ghes_cper_stub.c
> @@ -0,0 +1,19 @@
> +/*
> + * Stub interface for CPER payload parser for error injection
> + *
> + * Copyright(C) 2024 Huawei LTD.
> + *
> + * This code is licensed under the GPL version 2 or later. See the
> + * COPYING file in the top-level directory.
> + *
Trivial but I'd drop these trailing blank lines as they don't add
anything other than making people scroll further.

> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "qapi/qapi-commands-acpi-hest.h"
> +#include "hw/acpi/ghes.h"

Trivial but doe we need ghes.h?

> +
> +void qmp_inject_ghes_error(const char *cper, Error **errp)
> +{
> +    error_setg(errp, "GHES QMP error inject is not compiled in");
> +}