On 2014/6/10 7:46, Yinghai Lu wrote: > On Mon, Jun 9, 2014 at 1:19 AM, Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx> 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. > > Do you have any test case to reveal the problem? Just by code inspection. > >> >> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx> >> Cc: stable@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; > > No. This change is not needed. > > When x2apic is used, and apicid > 255, irq remapping is used. > > msi_chip.irq_set_affinity will be changed from msi_set_affinity to > x86_io_apic_ops.set_affinity (aka intel_setup_ioapic_entry), via > irq_remap_modify_chip_defaults(). Thanks for explanation, will drop this patch. Gerry > > Thanks > > Yinghai > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
