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Re: [Qemu-ppc] [PATCH v2] ppc: spapr-rtas - implement os-term rtas call

From: Nikunj A Dadhania
Subject: Re: [Qemu-ppc] [PATCH v2] ppc: spapr-rtas - implement os-term rtas call
Date: Thu, 26 Jun 2014 13:25:04 +0530
User-agent: Notmuch/0.17+27~gae47d61 (http://notmuchmail.org) Emacs/24.3.1 (x86_64-redhat-linux-gnu)

Alexander Graf <address@hidden> writes:

> On 25.06.14 13:27, Nikunj A Dadhania wrote:
>> Alexander Graf <address@hidden> writes:
>> Let me put down my understanding:
>> There are two possible way to handle kernel panic:
>> 1) Kdump service running in guest - already working
>> 2) Pass the kernel panic information to hypervisor - not there in Qemu
>>     pseries
>> So without kdump service running, if linux kernel hits a panic, its going
>> to check os-term and extended-os-term, only then its going to call
>> os-term.
> It's checking both for a reason. Find that reason.

Here is what I figured out from PAPR:

rtas ibm,os-term, does not gaurantee a return back to the guest cpu.

If ibm,extended-os-term property is set rtas call return will always


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