x86/apic: Drop apic::delivery_mode

This field is set to APIC_DELIVERY_MODE_FIXED in all cases, and is read
exactly once.  Fold the constant in uv_program_mmr() and drop the field.

Searching for the origin of the stale HyperV comment reveals commit
a31e58e129f7 ("x86/apic: Switch all APICs to Fixed delivery mode") which
notes:

  As a consequence of this change, the apic::irq_delivery_mode field is
  now pointless, but this needs to be cleaned up in a separate patch.

6 years is long enough for this technical debt to have survived.

  [ bp: Fold in
    https://lore.kernel.org/r/[email protected]
  ]

Signed-off-by: Andrew Cooper <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Steve Wahl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
index 29b9e55dcf26..566297bc87dd 100644
--- a/drivers/iommu/intel/irq_remapping.c
+++ b/drivers/iommu/intel/irq_remapping.c
@@ -1112,7 +1112,7 @@ static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
 	 * irq migration in the presence of interrupt-remapping.
 	*/
 	irte->trigger_mode = 0;
-	irte->dlvry_mode = apic->delivery_mode;
+	irte->dlvry_mode = APIC_DELIVERY_MODE_FIXED;
 	irte->vector = vector;
 	irte->dest_id = IRTE_DEST(dest);
 	irte->redir_hint = 1;