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, 0 deletions

diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h
index 449c82f71677..f89a42aff284 100644
--- a/arch/x86/include/asm/xen/pci.h
+++ b/arch/x86/include/asm/xen/pci.h
@@ -3,10 +3,15 @@
 
 #if defined(CONFIG_PCI_XEN)
 extern int __init pci_xen_init(void);
+extern int __init pci_xen_hvm_init(void);
 #define pci_xen 1
 #else
 #define pci_xen 0
 #define pci_xen_init (0)
+static inline int pci_xen_hvm_init(void)
+{
+        return -1;
+}
 #endif
 
 #if defined(CONFIG_PCI_MSI)