Re: [PATCH 1/1 V6] qemu-kvm: fix improper nmi emulation

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2011-12-08 10:42, Jan Kiszka wrote:
> On 2011-12-07 11:29, Avi Kivity wrote:
>> On 10/17/2011 06:00 PM, Lai Jiangshan wrote:
>>> From: Lai Jiangshan <laijs@cn.fujitsu.com>
>>>
>>> Currently, NMI interrupt is blindly sent to all the vCPUs when NMI
>>> button event happens. This doesn't properly emulate real hardware on
>>> which NMI button event triggers LINT1. Because of this, NMI is sent to
>>> the processor even when LINT1 is maskied in LVT. For example, this
>>> causes the problem that kdump initiated by NMI sometimes doesn't work
>>> on KVM, because kdump assumes NMI is masked on CPUs other than CPU0.
>>>
>>> With this patch, inject-nmi request is handled as follows.
>>>
>>> - When in-kernel irqchip is disabled, deliver LINT1 instead of NMI
>>>   interrupt.
>>> - When in-kernel irqchip is enabled, get the in-kernel LAPIC states
>>>   and test the APIC_LVT_MASKED, if LINT1 is unmasked, and then
>>>   delivering the NMI directly. (Suggested by Jan Kiszka)
>>>
>>> Changed from old version:
>>>   re-implement it by the Jan's suggestion.
>>>   fix the race found by Jan.
>>
>> This patch fell through the cracks, sorry.  Now applied.
> 
> Lai, what is the state of a corresponding QEMU upstream patch? I'd like
> to build on top of it for my upstream irqchip series.

Never mind, I'll include a patch in my series as it requires some
tweaking to the APIC backend concept.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux