600d7b47e8
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>
44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
PVPANIC DEVICE
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==============
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pvpanic device is a simulated ISA device, through which a guest panic
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event is sent to qemu, and a QMP event is generated. This allows
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management apps (e.g. libvirt) to be notified and respond to the event.
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The management app has the option of waiting for GUEST_PANICKED events,
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and/or polling for guest-panicked RunState, to learn when the pvpanic
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device has fired a panic event.
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ISA Interface
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-------------
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pvpanic exposes a single I/O port, by default 0x505. On read, the bits
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recognized by the device are set. Software should ignore bits it doesn't
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recognize. On write, the bits not recognized by the device are ignored.
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Software should set only bits both itself and the device recognize.
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Bit Definition
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--------------
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bit 0: setting it indicates a guest panic has happened.
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bit 1: named crashloaded. setting it indicates a guest panic and run
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kexec to handle error by guest itself.
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ACPI Interface
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--------------
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pvpanic device is defined with ACPI ID "QEMU0001". Custom methods:
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RDPT: To determine whether guest panic notification is supported.
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Arguments: None
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Return: Returns a byte, bit 0 set to indicate guest panic
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notification is supported. Other bits are reserved and
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should be ignored.
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WRPT: To send a guest panic event
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Arguments: Arg0 is a byte, with bit 0 set to indicate guest panic has
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happened. Other bits are reserved and should be cleared.
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Return: None
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The ACPI device will automatically refer to the right port in case it
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is modified.
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