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Re: [Qemu-devel] [RFC][PATCH 14/16] kvm: x86: Add user space part for in

From: Avi Kivity
Subject: Re: [Qemu-devel] [RFC][PATCH 14/16] kvm: x86: Add user space part for in-kernel i8259
Date: Sun, 04 Dec 2011 15:31:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0

On 12/03/2011 01:17 PM, Jan Kiszka wrote:
> From: Jan Kiszka <address@hidden>
> Introduce the alternative 'kvm-i8259' device model that exploits KVM
> in-kernel acceleration.
> The PIIX3 initialization code is furthermore extended by KVM specific
> IRQ route setup. Moreover, GSI injection differs in KVM mode from the
> user space model. As we can dispatch ISA-range IRQs to both IOAPIC and
> PIC inside the kernel, we do not need to inject them separately. This is
> reflected by a KVM-specific GSI handler.
> +
> +qemu_irq *kvm_i8259_init(void)
> +{
> +    ISADevice *dev;
> +
> +    dev = isa_create("kvm-i8259");

Same issue.  Is this a different device, or an different implementation
of the same device?

We're forcing migration from 1.0 to 1.1 to disable in-kernel irqchip on
the target.  For qemu itself, that's no issue.  But for qemu-kvm, it
will result in loss of performance, or hacks to alias the two back together.

error compiling committee.c: too many arguments to function

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