linux-kernel - Re: [PATCH 1/2] pvpanic: introduce crashloaded for pvpanic

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Message-ID: <87sgk9c4jx.fsf@dusky.pond.sub.org>
Date:   Tue, 21 Jan 2020 14:38:58 +0100
From:   Markus Armbruster <armbru@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     zhenwei pi <pizhenwei@...edance.com>, yelu@...edance.com,
        libvir-list@...hat.com, gregkh@...uxfoundation.org,
        qemu-devel@...gnu.org, linux-kernel@...r.kernel.org,
        mprivozn@...hat.com
Subject: Re: [PATCH 1/2] pvpanic: introduce crashloaded for pvpanic

Paolo Bonzini <pbonzini@...hat.com> writes:

> On 21/01/20 09:22, Markus Armbruster wrote:
>> zhenwei pi <pizhenwei@...edance.com> writes:
>> 
>>> 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@...edance.com>
>>> ---
>>>  docs/specs/pvpanic.txt | 8 ++++++--
>>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/docs/specs/pvpanic.txt b/docs/specs/pvpanic.txt
>>> index c7bbacc778..bdea68a430 100644
>>> --- a/docs/specs/pvpanic.txt
>>> +++ b/docs/specs/pvpanic.txt
>>> @@ -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.
>> 
>> Guest software, I presume.
>> 
>>> -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.
>> 
>> Suggest to scratch "named crashloaded."
>
> bit 1: a guest panic has happened and will be handled by the guest;
>        the host should record it or report it, but should not affect
>        the execution of the guest.
>
> ?
>
> Paolo

Works for me, thanks!