[PATCH v3 58/62] xen/acpi: Fix event-channel interrupt when booting with ACPI

[shannon.zhao at linaro.org]

From: Shannon Zhao <shannon.zhao at linaro.org>

When booting with ACPI, store the event-channel interrupt number and
flag in HVM parameter HVM_PARAM_CALLBACK_IRQ. Then Dom0 could get it
through hypercall HVMOP_get_param.

Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
---
 xen/arch/arm/domain_build.c | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 9532807..36917be 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -2067,23 +2067,34 @@ static void evtchn_fixup(struct domain *d, struct kernel_info *kinfo)
     printk("Allocating PPI %u for event channel interrupt\n",
            d->arch.evtchn_irq);
 
-    /* Fix up "interrupts" in /hypervisor node */
-    node = fdt_path_offset(kinfo->fdt, "/hypervisor");
-    if ( node < 0 )
-        panic("Cannot find the /hypervisor node");
-
-    /* Interrupt event channel upcall:
-     *  - Active-low level-sensitive
-     *  - All CPUs
-     *
-     *  TODO: Handle properly the cpumask
-     */
-    set_interrupt_ppi(intr, d->arch.evtchn_irq, 0xf,
-                      DT_IRQ_TYPE_LEVEL_LOW);
-    res = fdt_setprop_inplace(kinfo->fdt, node, "interrupts",
-                              &intr, sizeof(intr));
-    if ( res )
-        panic("Cannot fix up \"interrupts\" property of the hypervisor node");
+    if ( acpi_disabled )
+    {
+        /* Fix up "interrupts" in /hypervisor node */
+        node = fdt_path_offset(kinfo->fdt, "/hypervisor");
+        if ( node < 0 )
+            panic("Cannot find the /hypervisor node");
+
+        /* Interrupt event channel upcall:
+         *  - Active-low level-sensitive
+         *  - All CPUs
+         *
+         *  TODO: Handle properly the cpumask
+         */
+        set_interrupt_ppi(intr, d->arch.evtchn_irq, 0xf,
+                          DT_IRQ_TYPE_LEVEL_LOW);
+        res = fdt_setprop_inplace(kinfo->fdt, node, "interrupts",
+                                  &intr, sizeof(intr));
+        if ( res )
+            panic("Cannot fix up \"interrupts\" property of the hypervisor node");
+    }
+    else
+    {
+        int type = 3;
+        int flag = 2; /* Active-low level-sensitive  */
+        d->arch.hvm_domain.params[HVM_PARAM_CALLBACK_IRQ] = (u64)type << 56
+                                                            | flag << 8
+                                                            | d->arch.evtchn_irq;
+    }
 }
 
 static void __init find_gnttab_region(struct domain *d,
-- 
2.1.0