xen: support GSI -> pirq remapping in PV on HVM guests

Disable pcifront when running on HVM: it is meant to be used with pv
guests that don't have PCI bus.

Use acpi_register_gsi_xen_hvm to remap GSIs into pirqs.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 239b011ef56f..32269bcbd88c 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -623,7 +623,8 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name)
 
         /* If we are a PV guest, we don't have GSIs (no ACPI passed). Therefore
          * we are using the !xen_initial_domain() to drop in the function.*/
-        if (identity_mapped_irq(gsi) || !xen_initial_domain()) {
+        if (identity_mapped_irq(gsi) || (!xen_initial_domain() &&
+                                xen_pv_domain())) {
                 irq = gsi;
                 irq_alloc_desc_at(irq, 0);
         } else
@@ -1397,6 +1398,9 @@ void __init xen_init_IRQ(void)
         if (xen_hvm_domain()) {
                 xen_callback_vector();
                 native_init_IRQ();
+                /* pci_xen_hvm_init must be called after native_init_IRQ so that
+                 * __acpi_register_gsi can point at the right function */
+                pci_xen_hvm_init();
         } else {
                 irq_ctx_init(smp_processor_id());
         }