[Patch Part1 V2 01/29] x86, irq: update high address field when updating affinity for MSI IRQ

[Jiang Liu]

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.

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/