Re: [Patch V3 01/37] x86, irq: update high address field when updating affinity for MSI IRQ

[Thomas Gleixner]

On Tue, 27 May 2014, Jiang Liu wrote:

> If x2apic is enabled, the MSI high address field should also be aslo
> updated when setting affinity for MSI IRQ, otherwise the MSI IRQ may
> target wrong APIC IDs.

That should be tagged for stable, right?
 
> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> ---
>  arch/x86/kernel/apic/io_apic.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 9d0a9795a0f8..2de992501a1b 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -3007,6 +3007,10 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
>  
>  	__get_cached_msi_msg(data->msi_desc, &msg);
>  
> +	msg.address_hi = MSI_ADDR_BASE_HI;
> +	if (x2apic_enabled())
> +		msg.address_hi |= MSI_ADDR_EXT_DEST_ID(dest);
> +
>  	msg.data &= ~MSI_DATA_VECTOR_MASK;
>  	msg.data |= MSI_DATA_VECTOR(cfg->vector);
>  	msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
> -- 
> 1.7.10.4
> 
> 
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