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[Qemu-arm] [PATCH RESEND v15 06/10] docs: APEI GHES generation and CPER
From: |
Dongjiu Geng |
Subject: |
[Qemu-arm] [PATCH RESEND v15 06/10] docs: APEI GHES generation and CPER record description |
Date: |
Thu, 8 Nov 2018 02:29:45 -0800 |
Add APEI/GHES detailed design document
Signed-off-by: Dongjiu Geng <address@hidden>
---
Address Igor's comments to add a doc
---
docs/specs/acpi_hest_ghes.txt | 97 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 97 insertions(+)
create mode 100644 docs/specs/acpi_hest_ghes.txt
diff --git a/docs/specs/acpi_hest_ghes.txt b/docs/specs/acpi_hest_ghes.txt
new file mode 100644
index 0000000..fbfc787
--- /dev/null
+++ b/docs/specs/acpi_hest_ghes.txt
@@ -0,0 +1,97 @@
+APEI tables generating and CPER record
+=============================
+
+Copyright (C) 2017 HuaWei Corporation.
+
+Design Details:
+-------------------
+
+ etc/acpi/tables etc/hardware_errors
+ ====================
==========================================
++ +--------------------------+ +-----------------------+
+| | HEST | | address |
+--------------+
+| +--------------------------+ | registers |
| Error Status |
+| | GHES1 | | +---------------------+
| Data Block 1 |
+| +--------------------------+ +--------->| |error_block_address1
|----------->| +------------+
+| | ................. | | | +---------------------+
| | CPER |
+| | error_status_address-----+-+ +------->| |error_block_address2 |--------+
| | CPER |
+| | ................. | | | +---------------------+ |
| | .... |
+| | read_ack_register--------+-+ | | | .............. | |
| | CPER |
+| | read_ack_preserve | | | +-----------------------+ |
| +------------+
+| | read_ack_write | | | +----->| |error_block_addressN |------+ |
| Error Status |
++ +--------------------------+ | | | | +---------------------+ | |
| Data Block 2 |
+| | GHES2 | +-+-+----->| |read_ack_register1 | |
+-->| +------------+
++ +--------------------------+ | | | +---------------------+ |
| | CPER |
+| | ................. | | | +--->| |read_ack_register2 | |
| | CPER |
+| | error_status_address-----+---+ | | | +---------------------+ |
| | .... |
+| | ................. | | | | | ............. | |
| | CPER |
+| | read_ack_register--------+-----+-+ | +---------------------+ |
+-+------------+
+| | read_ack_preserve | | +->| |read_ack_registerN | |
| |.......... |
+| | read_ack_write | | | | +---------------------+ |
| +------------+
++ +--------------------------| | | |
| Error Status |
+| | ............... | | | |
| Data Block N |
++ +--------------------------+ | |
+---->| +------------+
+| | GHESN | | |
| | CPER |
++ +--------------------------+ | |
| | CPER |
+| | ................. | | |
| | .... |
+| | error_status_address-----+-----+ |
| | CPER |
+| | ................. | |
+-+------------+
+| | read_ack_register--------+---------+
+| | read_ack_preserve |
+| | read_ack_write |
++ +--------------------------+
+
+(1) QEMU generates the ACPI HEST table. This table goes in the current
+ "etc/acpi/tables" fw_cfg blob. Each error source has different
+ notification type.
+
+(2) A new fw_cfg blob called "etc/hardware_errors" is introduced. QEMU
+ also need to populate this blob. The "etc/hardwre_errors" fw_cfg blob
+ contains one address registers table and one Error Status Data Block
+ table, all of which are pre-allocated.
+
+(3) The address registers table contains N Error Block Address entries
+ and N Read Ack Address entries, the size for each entry is 8-byte.
+ The Error Status Data Block table contains N Error Status Data Block
+ entries, the size for each entry is 4096(0x1000) bytes. The total size
+ for "etc/hardware_errors" fw_cfg blob is (N * 8 * 2 + N * 4096) bytes.
+
+(4) QEMU generates the ACPI linker/loader script for the firmware
+
+(4a) The HEST table is part of "etc/acpi/tables", the firmware already
+ allocates the memory for it, because QEMU already generates an ALLOCATE
+ linker/loader command for it
+
+(4b) QEMU creates another ALLOCATE command for the "etc/hardware_errors"
+ blob. The firmware allocates memory for this blob and downloads it.
+
+(5) QEMU generates N ADD_POINTER commands, which patch address in the
+ "error_status_address" fields of the HEST table with a pointer to the
+ corresponding "address registers" in the downloaded "etc/hardware_errors"
+ blob.
+
+(6) QEMU generates N ADD_POINTER commands, which patch address in the
+ "read_ack_register" fields of the HEST table with a pointer to the
+ corresponding "address registers" in the downloaded "etc/hardware_errors"
blob.
+
+(7) QEMU generates N ADD_POINTER commands for the firmware, which patch
+ address in the " error_block_address" fields with a pointer to the
+ respective "Error Status Data Block" in the downloaded
"etc/hardware_errors"
+ blob.
+
+(8) QEMU Defines a third and write-only fw_cfg blob which is called
+ "etc/hardware_errors_addr". Through that blob, the firmware can send back
+ the guest-side allocation addresses to QEMU. The "etc/hardware_errors_addr"
+ blob contains a 8-byte entry. QEMU generates a single WRITE_POINTER
commands
+ for the firmware, the firmware will write back the start address of
+ "etc/hardware_errors" blob to fw_cfg file "etc/hardware_errors_addr". Then
+ Qemu will know the Error Status Data Block for every error source. Each of
+ Error Status Data Block has fixed size which is 4096(0x1000).
+
+(9) When QEMU gets SIGBUS from the kernel, QEMU formats the CPER right into
+ guest memory, and then injects whatever interrupt (or assert whatever GPIO
line)
+ as a notification which is necessary for notifying the guest.
+
+(10) This notification (in virtual hardware) will be handled by guest kernel,
+ guest APEI driver will read the CPER which is recorded by QEMU and do the
+ recovery.
--
1.8.3.1
- [Qemu-arm] [PATCH RESEND v15 00/10] Add ARMv8 RAS virtualization support in QEMU, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 02/10] acpi: add build_append_ghes_notify() helper for Hardware Error Notification, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 03/10] acpi: add build_append_ghes_generic_data() helper for Generic Error Data Entry, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 04/10] acpi: add build_append_ghes_generic_status() helper for Generic Error Status Block, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 01/10] ACPI: add some GHES structures and macros definition, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 06/10] docs: APEI GHES generation and CPER record description,
Dongjiu Geng <=
- [Qemu-arm] [PATCH RESEND v15 07/10] KVM: Move related hwpoison page functions to accel/kvm/ folder, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 05/10] ACPI: Add APEI GHES table generation and CPER record support, Dongjiu Geng, 2018/11/08
- [Qemu-arm] [PATCH RESEND v15 10/10] target-arm: kvm64: handle SIGBUS signal from kernel or KVM, Dongjiu Geng, 2018/11/08
[Qemu-arm] [PATCH RESEND v15 09/10] hw/arm/virt: Add RAS platform version for migration, Dongjiu Geng, 2018/11/08