Re: [Qemu-devel] [PATCH] kvm-all.c: Move init of irqchip_inject_ioctl out of kvm_irqchip_create()

[Jan Kiszka]

On 2012-08-06 19:05, Peter Maydell wrote:
> Move the init of the irqchip_inject_ioctl field of KVMState out of
> kvm_irqchip_create() and into kvm_init(), so that kvm_set_irq()
> can be used even when no irqchip is created (for architectures
> that support async interrupt notification even without an in
> kernel irqchip).
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> We can't just set irqchip_inject_ioctl in target-*/kvm.c because
> the KVMState struct layout is private to kvm-all.c. Moving the
> default initialisation of this field seemed the simplest approach.
> It's safe because the use in kvm_set_irq() is guarded by a check of
> kvm_async_interrupts_enabled().
> 
> The other approach would be to have a helper function for setting
> the field, but that seems overkill when KVM_IRQ_LINE is the standard
> default value. (KVM_IRQ_LINE_STATUS seems to be undocumented,
> incidentally. I am going to assume it's another x86ism until somebody
> does document it :-))

Oh, and when implementing KVM_IRQ_LINE_STATUS for ARM, please also feel
free to document it in a way that it applies both to its x86 history and
new architectures.

Jan

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