x86, x2apic: use virtual wire A mode in disable_IO_APIC() with interrupt-remapping

Impact: make kexec work with x2apic

disable_IO_APIC() gets called during crashdump aswell, which configures the
IO-APIC/LAPIC so that legacy interrupts can be delivered for the kexec'd kernel.

In the presence of interrupt-remapping, we need to change the
interrupt-remapping configuration aswell as modifying IO-APIC for virtual wire
B mode.

To keep things simple during the crash, use virtual wire A mode
(for which we don't need to touch io-apic and interrupt-remapping tables).

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index b18a7734d689..4d975d0e3588 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2040,8 +2040,13 @@ void disable_IO_APIC(void)
          * If the i8259 is routed through an IOAPIC
          * Put that IOAPIC in virtual wire mode
          * so legacy interrupts can be delivered.
+         *
+         * With interrupt-remapping, for now we will use virtual wire A mode,
+         * as virtual wire B is little complex (need to configure both
+         * IOAPIC RTE aswell as interrupt-remapping table entry).
+         * As this gets called during crash dump, keep this simple for now.
          */
-        if (ioapic_i8259.pin != -1) {
+        if (ioapic_i8259.pin != -1 && !intr_remapping_enabled) {
                 struct IO_APIC_route_entry entry;
 
                 memset(&entry, 0, sizeof(entry));
@@ -2061,7 +2066,10 @@ void disable_IO_APIC(void)
                 ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
         }
 
-        disconnect_bsp_APIC(ioapic_i8259.pin != -1);
+        /*
+         * Use virtual wire A mode when interrupt remapping is enabled.
+         */
+        disconnect_bsp_APIC(!intr_remapping_enabled && ioapic_i8259.pin != -1);
 }
 
 #ifdef CONFIG_X86_32