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

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Message-ID: <538451E7.7030206@linux.intel.com>
Date:	Tue, 27 May 2014 16:50:47 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [Patch V3 01/37] x86, irq: update high address field when updating
 affinity for MSI IRQ

Yes, I think it should be marked for stable branches.

On 2014/5/27 16:11, Thomas Gleixner wrote:
> 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@...ux.intel.com>
>> ---
>>  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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