[Qemu-arm] [Qemu-devel] [PATCH v6 0/3] Generate APEI GHES table and dynamically record CPER

[Programmingkid]

> On Aug 4, 2017, at 1:22 AM, address@hidden wrote:
> 
> Date: Fri, 4 Aug 2017 12:37:52 +0800
> From: Dongjiu Geng <address@hidden>
> To: <address@hidden>, <address@hidden>, <address@hidden>,
>       <address@hidden>, <address@hidden>,
>       <address@hidden>, <address@hidden>
> Cc: <address@hidden>, <address@hidden>,
>       <address@hidden>
> Subject: [Qemu-devel] [PATCH v6 0/3] Generate APEI GHES table and
>       dynamically record CPER
> Message-ID: <address@hidden>
> Content-Type: text/plain
> 
> In the armv8 platform, the mainly hardware error source are ARMv8
> SEA/SEI/GSIV. For the ARMv8 SEA/SEI, the KVM or host kernel will signal SIGBUS
> or use other interface to notify user space, such as Qemu. After Qemu gets
> the notification, it will record the CPER and inject the SEA/SEI to KVM. this
> series of patches will generate APEI table when guest OS boot up, and 
> dynamically
> record CPER for the guest OS about the generic hardware errors, currently the
> userspace only handle the memory section hardware errors. Before Qemu record 
> the
> CPER, it needs to check the ACK value written by the guest OS to avoid 
> read-write
> race condition.
> 
> Below is the APEI/GHESV2/CPER table layout, the max number of error soure is 
> 11,
> which is classified by notification type, now only enable the SEA/SEI 
> notification type
> error source.
> 
>     etc/acpi/tables                               etc/hardware_errors
>    ====================                    
> ==========================================
>                                          +------------------+
> +----------------------------+            |    address       |              
> +--------------+
> |    HEST                    +            |    registers     |              | 
> Error Status |
> + +--------------------------+            | +----------------+              | 
> Data Block 0 |
> | | GHES0                    | +--------->| |status_address0 |------------->| 
> +------------+
> +--------------------------+ |          | +----------------+              | | 
>  CPER      |
> | | .................        | | +------->| |status_address1 |----------+   | 
> |  CPER      |
> | | error_status_address     | | |        | +----------------+          |   | 
> |  ....      |
> | | .................        | | |        |  .............   |          |   | 
> |  CPER      |
> | | error_status_address-----+-+ |        +------------------+          |   | 
> +-+------------+
> | | .................        |   | +----->| |status_address10|--------+ |   | 
> Error Status |
> | | read_ack_register--------+-+ | |      | +----------------+        | |   | 
> Data Block 1 |
> | | read_ack_preserve        | +-+-+----->| |ack_address0    |--+     | +-->| 
> +------------+
> | | read_ack_write           |   | |      | +----------------+  |     |     | 
> |  CPER      |
> + +--------------------------+   | | +--->| |ack_address1    |--+-+   |     | 
> |  CPER      |
> | | GHES1                    |   | | |    | +----------------+  | |   |     | 
> |  ....      |
> + +--------------------------+   | | |    | | .............  |  | |   |     | 
> |  CPER      |
> | | .................        |   | | |    | +----------------+  | |   |     
> +-+------------+
> | | error_status_address-----+---+ | | +->| |ack_address10   |--+-+-+ |     | 
> |..........  |
> | | .................        |     | | |  | +----------------+  | | | |     | 
> +------------+
> | | read_ack_register--------+-----+-+ |  | |      ack0      |<-+ | | |     | 
> Error Status |
> | | read_ack_preserve        |     |   |  | +----------------+    | | |     | 
> Data Block 10|
> | | read_ack_write           |     |   |  | |      ack1      |<---+ | +---->| 
> +------------+
> + +--------------------------+     |   |  | +----------------+      |       | 
> |  CPER      |
> | | ...............          |     |   |  | |       ....     |      |       | 
> |  CPER      |
> + +--------------------------+     |   |  | +--------------+ |      |       | 
> |  ....      |
> | | GHES10                   |     |   |  | |      ack10     |<---- +       | 
> |  CPER      |
> + +--------------------------+     |   |  | +----------------+              
> +-+------------+
> | | .................        |     |   |
> | | error_status_address-----+-----+   |
> | | .................        |         |
> | | read_ack_register--------+---------+
> | | read_ack_preserve        |
> | | read_ack_write           |
> + +--------------------------+


Excellent job with the ASCII drawing.