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pvpanic: introduce crashloaded for pvpanic 

Add bit 1 for pvpanic. This bit means that guest hits a panic, but
guest wants to handle error by itself. Typical case: Linux guest runs
kdump in panic. It will help us to separate the abnormal reboot from
normal operation.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20200114023102.612548-2-pizhenwei@bytedance.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
zhenwei pi 2020-01-14 10:31:01 +08:00 committed by Paolo Bonzini
parent bc9888f759
commit 600d7b47e8
1 changed files with 6 additions and 2 deletions
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8
docs/specs/pvpanic.txt
View File

@ -16,8 +16,12 @@ pvpanic exposes a single I/O port, by default 0x505. On read, the bits
recognized by the device are set. Software should ignore bits it doesn't
recognize. On write, the bits not recognized by the device are ignored.
Software should set only bits both itself and the device recognize.
Currently, only bit 0 is recognized, setting it indicates a guest panic
has happened.
Bit Definition
--------------
bit 0: setting it indicates a guest panic has happened.
bit 1: named crashloaded. setting it indicates a guest panic and run
kexec to handle error by guest itself.
ACPI Interface
--------------