Re: [patch V2 27/46] x86/xen: Rework MSI teardown

[Jürgen Groß]

On 26.08.20 13:16, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>
> X86 cannot store the irq domain pointer in struct device without breaking
> XEN because the irq domain pointer takes precedence over arch_*_msi_irqs()
> fallbacks.
>
> XENs MSI teardown relies on default_teardown_msi_irqs() which invokes
> arch_teardown_msi_irq(). default_teardown_msi_irqs() is a trivial iterator
> over the msi entries associated to a device.
>
> Implement this loop in xen_teardown_msi_irqs() to prepare for removal of
> the fallbacks for X86.
>
> This is a preparatory step to wrap XEN MSI alloc/free into a irq domain
> which in turn allows to store the irq domain pointer in struct device and
> to use the irq domain functions directly.
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen