Re: [Qemu-devel] [PATCH v4 00/15] uq/master: Introduce basic irqchip support

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

On 2011-12-12 17:37, Marcelo Tosatti wrote:
> On Thu, Dec 08, 2011 at 12:52:19PM +0100, Jan Kiszka wrote:
>> Changes in v4:
>> - rebased of current uq/master
>> - fixed stupid bugs that broke bisectability and user space irqchip mode
>> - integrated NMI-over-LINT1 injection logic
>>
>> CC: Lai Jiangshan <laijs@cn.fujitsu.com>
>>
>> Jan Kiszka (15):
>>   msi: Generalize msix_supported to msi_supported
>>   kvm: Move kvmclock into hw/kvm folder
>>   apic: Stop timer on reset
>>   apic: Inject external NMI events via LINT1
>>   apic: Introduce backend/frontend infrastructure for KVM reuse
>>   apic: Open-code timer save/restore
>>   i8259: Introduce backend/frontend infrastructure for KVM reuse
>>   ioapic: Introduce backend/frontend infrastructure for KVM reuse
>>   memory: Introduce memory_region_init_reservation
>>   kvm: Introduce core services for in-kernel irqchip support
>>   kvm: x86: Establish IRQ0 override control
>>   kvm: x86: Add user space part for in-kernel APIC
>>   kvm: x86: Add user space part for in-kernel i8259
>>   kvm: x86: Add user space part for in-kernel IOAPIC
>>   kvm: Arm in-kernel irqchip support
> 
> Looks good to me.
> 
> Any thoughts on the qemu-kvm merge plan? Sounds painful.

Pain will be where the existing qemu-kvm extensions collide with these
refactored upstream devices (backend/frontend split specifically).
That's where we have to merge very carefully. Haven't tried this yet,
will give it a spin tomorrow or so.

>From that point on, disabling the new stuff for now and at some point
switching over from the old one should be simple again.

BTW, PIT+HPET+speaker will cause similar issues for the same reasons.

Jan

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