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From: Eric DeVolder <eric.devolder@oracle.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "ehabkost@redhat.com" <ehabkost@redhat.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"kwilk@oracle.com" <kwilk@oracle.com>,
	"pbonzini@redhat.com" <pbonzini@redhat.com>,
	"imammedo@redhat.com" <imammedo@redhat.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	"rth@twiddle.net" <rth@twiddle.net>
Subject: Re: [PATCH v2 0/7] acpi: Error Record Serialization Table, ERST, support for QEMU
Date: Fri, 14 May 2021 14:12:25 +0000	[thread overview]
Message-ID: <CO1PR10MB4531202E3233581364F9AC7997509@CO1PR10MB4531.namprd10.prod.outlook.com> (raw)
In-Reply-To: <20210514095729-mutt-send-email-mst@kernel.org>

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Michael,
Yes, I'm working on a v3 to accommodate items Igor has requested.
eric
________________________________
From: Michael S. Tsirkin <mst@redhat.com>
Sent: Friday, May 14, 2021 8:57 AM
To: Eric DeVolder <eric.devolder@oracle.com>
Cc: imammedo@redhat.com <imammedo@redhat.com>; marcel.apfelbaum@gmail.com <marcel.apfelbaum@gmail.com>; pbonzini@redhat.com <pbonzini@redhat.com>; rth@twiddle.net <rth@twiddle.net>; ehabkost@redhat.com <ehabkost@redhat.com>; qemu-devel@nongnu.org <qemu-devel@nongnu.org>; Boris Ostrovsky <boris.ostrovsky@oracle.com>; kwilk@oracle.com <kwilk@oracle.com>
Subject: Re: [PATCH v2 0/7] acpi: Error Record Serialization Table, ERST, support for QEMU

On Mon, Feb 08, 2021 at 03:57:52PM -0500, Eric DeVolder wrote:
> This patchset introduces support for the ACPI Error Record
> Serialization Table, ERST.

OK I'm expecting v3 I guess?


> Linux uses the persistent storage filesystem, pstore, to record
> information (eg. dmesg tail) upon panics and shutdowns.  Pstore is
> independent of, and runs before, kdump.  In certain scenarios (ie.
> hosts/guests with root filesystems on NFS/iSCSI where networking
> software and/or hardware fails), pstore may contain the only
> information available for post-mortem debugging.
>
> Two common storage backends for the pstore filesystem are ACPI ERST
> and UEFI. Most BIOS implement ACPI ERST; however, ACPI ERST is not
> currently supported in QEMU, and UEFI is not utilized in all guests.
> By implementing ACPI ERST within QEMU, then the ACPI ERST becomes a
> viable pstore storage backend for virtual machines (as it is now for
> bare metal machines).
>
> Enabling support for ACPI ERST facilitates a consistent method to
> capture kernel panic information in a wide range of guests: from
> resource- constrained microvms to very large guests, and in
> particular, in direct-boot environments (which would lack UEFI
> run-time services).
>
> Note that Microsoft Windows also utilizes the ACPI ERST for certain
> crash information, if available.
>
> The ACPI ERST persistent storage is contained within a single backing
> file, with a default size of 64KiB. The size and filename of the
> backing file can be obtained from QEMU parameters.
>
> The ACPI specification[1], in Chapter "ACPI Platform Error Interfaces
> (APEI)", and specifically subsection "Error Serialization", outlines
> a method for storing error records into persistent storage.
>
> [1] "Advanced Configuration and Power Interface Specification",
>     version 6.2, May 2017.
>     https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf
>
> [2] "Unified Extensible Firmware Interface Specification",
>     version 2.8, March 2019.
>     https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf
>
> Suggested-by: Konrad Wilk <konrad.wilk@oracle.com>
> Signed-off-by: Eric DeVolder <eric.devolder@oracle.com>
>
> ---
> v2: 8feb2021
>  - Added qtest/smoke test per Paolo Bonzini
>  - Split patch into smaller chunks, per Igo Mammedov
>  - Did away with use of ACPI packed structures, per Igo Mammedov
>
> v1: 26oct2020
>  - initial post
>
> ---
> Eric DeVolder (7):
>   ACPI ERST: bios-tables-test.c steps 1 and 2
>   ACPI ERST: header file for erst
>   ACPI ERST: support for ACPI ERST feature
>   ACPI ERST: build step for ACPI ERST
>   ACPI ERST: support ERST for x86 guest
>   ACPI ERST: qtest for ERST
>   ACPI ERST: bios-tables-test.c step 5
>
>  hw/acpi/erst.c               | 952 +++++++++++++++++++++++++++++++++++++++++++
>  hw/acpi/meson.build          |   1 +
>  hw/i386/acpi-build.c         |   4 +
>  include/hw/acpi/erst.h       |  77 ++++
>  tests/data/acpi/microvm/ERST |   0
>  tests/data/acpi/pc/ERST      | Bin 0 -> 976 bytes
>  tests/data/acpi/q35/ERST     | Bin 0 -> 976 bytes
>  tests/qtest/erst-test.c      | 106 +++++
>  tests/qtest/meson.build      |   2 +
>  9 files changed, 1142 insertions(+)
>  create mode 100644 hw/acpi/erst.c
>  create mode 100644 include/hw/acpi/erst.h
>  create mode 100644 tests/data/acpi/microvm/ERST
>  create mode 100644 tests/data/acpi/pc/ERST
>  create mode 100644 tests/data/acpi/q35/ERST
>  create mode 100644 tests/qtest/erst-test.c
>
> --
> 1.8.3.1


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      reply	other threads:[~2021-05-14 14:14 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08 20:57 [PATCH v2 0/7] acpi: Error Record Serialization Table, ERST, support for QEMU Eric DeVolder
2021-02-08 20:57 ` [PATCH v2 1/7] ACPI ERST: bios-tables-test.c steps 1 and 2 Eric DeVolder
2021-02-08 20:57 ` [PATCH v2 2/7] ACPI ERST: header file for erst Eric DeVolder
2021-02-08 20:57 ` [PATCH v2 3/7] ACPI ERST: support for ACPI ERST feature Eric DeVolder
2021-04-06 19:31   ` Igor Mammedov
2021-04-09 15:54     ` Eric DeVolder
2021-04-14  9:17       ` Igor Mammedov
2021-05-03 15:49         ` Eric DeVolder
2021-05-03 17:07           ` Igor Mammedov
2021-05-17 15:01             ` Eric DeVolder
2021-05-17 16:31               ` Igor Mammedov
2021-05-18 17:08                 ` Eric DeVolder
2021-05-20 11:00                   ` Igor Mammedov
2021-05-25 20:22                     ` Eric DeVolder
2021-05-25 21:43                       ` Igor Mammedov
2021-02-08 20:57 ` [PATCH v2 4/7] ACPI ERST: build step for ACPI ERST Eric DeVolder
2021-04-06 19:17   ` Igor Mammedov
2021-02-08 20:57 ` [PATCH v2 5/7] ACPI ERST: support ERST for x86 guest Eric DeVolder
2021-02-08 20:57 ` [PATCH v2 6/7] ACPI ERST: qtest for ERST Eric DeVolder
2021-02-08 20:57 ` [PATCH v2 7/7] ACPI ERST: bios-tables-test.c step 5 Eric DeVolder
2021-03-01 19:04 ` [PATCH v2 0/7] acpi: Error Record Serialization Table, ERST, support for QEMU Eric Devolder
2021-04-01 13:44   ` Michael S. Tsirkin
2021-05-14 13:57 ` Michael S. Tsirkin
2021-05-14 14:12   ` Eric DeVolder [this message]

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