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Re: [Qemu-devel] [PATCH v2 1/3] q35: set split kernel irqchip as default
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH v2 1/3] q35: set split kernel irqchip as default |
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Date: |
Mon, 6 May 2019 11:17:28 -0500 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 03/05/19 15:00, Michael S. Tsirkin wrote:
> On Mon, Apr 29, 2019 at 11:55:56AM -0300, Eduardo Habkost wrote:
>> irqchip=split and irqchip=kernel aren't guest ABI compatible, are
>> they?
>
> Can you remind me why they aren't?
They are compatible if the userspace IOAPIC is configured with "-global
ioapic.version=0x11". The userspace IOAPIC in addition supports version
0x20, which adds the EOI register (a requirement for interrupt remapping
but not necessary outside that case), and makes it the default.
Paolo