[PATCH v3 5/9] xen/pvh: Make sure we don't use ACPI_IRQ_MODEL_PIC for SCI

[Boris Ostrovsky]

Since we are not using PIC and (at least currently) don't have IOAPIC
we want to make sure that acpi_irq_model doesn't stay set to
ACPI_IRQ_MODEL_PIC (which is the default value). If we allowed it to
stay then acpi_os_install_interrupt_handler() would try (and fail) to
request_irq() for PIC.

Instead we set the model to ACPI_IRQ_MODEL_PLATFORM which will prevent
this from happening.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
Changes in v3:
* Moved update of acpi_irq_model to x86_init.oem.arch_setup() (i.e.
  after ACPI has been initialized so we know whether or not we have
  IOAPICs). Clarified comit message.
* Moved xen_hvm_init_shared_info() into patch 4.

 arch/x86/xen/enlighten.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index d2144f7..6d406f3 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1672,6 +1672,16 @@ asmlinkage __visible void __init xen_start_kernel(void)
 }
 
 #ifdef CONFIG_XEN_PVH
+
+static void xen_pvh_arch_setup(void)
+{
+#ifdef CONFIG_ACPI
+	/* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
+	if (nr_ioapics == 0)
+		acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
+#endif
+}
+
 static void __init init_pvh_bootparams(void)
 {
 	struct xen_memory_map memmap;
@@ -1752,6 +1762,8 @@ void __init xen_prepare_pvh(void)
 	wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
 
 	init_pvh_bootparams();
+
+	x86_init.oem.arch_setup = xen_pvh_arch_setup;
 }
 #endif
 
-- 
2.7.4