xive: Fix mangling of interrupt server# in opal_get/set_xive()

The OPAL API uses mangled server numbers with the link in the
bottom 2 bits like a real XICS does, we need to account for it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

Author: ozbenh

hw/xive.c

@@ -1477,7 +1477,7 @@ static int64_t xive_source_get_xive(struct irq_source *is __unused,
 	uint32_t target_id;
 
 	if (xive_get_eq_info(isn, &target_id, prio)) {
-		*server = target_id;
+		*server = target_id << 2;
 		return OPAL_SUCCESS;
 	} else
 		return OPAL_PARAMETER;
@@ -1490,6 +1490,9 @@ static int64_t xive_source_set_xive(struct irq_source *is, uint32_t isn,
 	uint32_t idx = isn - s->esb_base;
  	void *mmio_base;
 
+	/* Unmangle server */
+	server >>= 2;
+
 	/* Let XIVE configure the EQ */
 	if (!xive_set_eq_info(isn, server, prio))
 		return OPAL_PARAMETER;
@@ -1704,15 +1707,10 @@ struct xive_cpu_state {
 static void xive_ipi_init(struct xive *x, struct cpu_thread *cpu)
 {
 	struct xive_cpu_state *xs = cpu->xstate;
-	uint32_t idx = GIRQ_TO_IDX(xs->ipi_irq);
-	uint8_t *mm = x->esb_mmio + idx * 0x20000;
 
 	assert(xs);
 
-	xive_source_set_xive(&x->ipis.is, xs->ipi_irq, cpu->pir, 0x7);
-
-	/* Clear P and Q */
-	in_8(mm + 0x10c00);
+	xive_source_set_xive(&x->ipis.is, xs->ipi_irq, cpu->pir << 2, 0x7);
 }
 
 static void xive_ipi_eoi(struct xive *x, uint32_t idx)