x86: early PV on HVM features initialization.

Initialize basic pv on hvm features adding a new Xen HVM specific
hypervisor_x86 structure.

Don't try to initialize xen-kbdfront and xen-fbfront when running on HVM
because the backends are not available.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 3479332113e9..d96fa75b45ec 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -56,6 +56,8 @@
 #include <xen/events.h>
 #include <xen/page.h>
 
+#include <xen/hvm.h>
+
 #include "xenbus_comms.h"
 #include "xenbus_probe.h"
 
@@ -805,11 +807,24 @@ static int __init xenbus_probe_init(void)
         if (xen_initial_domain()) {
                 /* dom0 not yet supported */
         } else {
+                if (xen_hvm_domain()) {
+                        uint64_t v = 0;
+                        err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v);
+                        if (err)
+                                goto out_error;
+                        xen_store_evtchn = (int)v;
+                        err = hvm_get_parameter(HVM_PARAM_STORE_PFN, &v);
+                        if (err)
+                                goto out_error;
+                        xen_store_mfn = (unsigned long)v;
+                        xen_store_interface = ioremap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
+                } else {
+                        xen_store_evtchn = xen_start_info->store_evtchn;
+                        xen_store_mfn = xen_start_info->store_mfn;
+                        xen_store_interface = mfn_to_virt(xen_store_mfn);
+                }
                 xenstored_ready = 1;
-                xen_store_evtchn = xen_start_info->store_evtchn;
-                xen_store_mfn = xen_start_info->store_mfn;
         }
-        xen_store_interface = mfn_to_virt(xen_store_mfn);
 
         /* Initialize the interface to xenstore. */
         err = xs_init();