# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxx>
# Date 1278682007 -3600
# Node ID dc3138d60b40baf38016a9b58f438598580a407f
# Parent  a672af698bc387ea92070fc3ef337e8c2fbb716e
Add a new HVMOP which allows an HVM guest to get the current
Xen absolute system time, so that it can use SCHEDOP_poll in a
sensible fashion.  HVM PV drivers can't use the normal PV clock
because they might have TSC offsets that hey don't know about.

Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>

diff -r a672af698bc3 -r dc3138d60b40 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c	Fri Jul 09 12:35:58 2010 +0100
+++ b/xen/arch/x86/hvm/hvm.c	Fri Jul 09 14:26:47 2010 +0100
@@ -3188,6 +3188,15 @@
         break;
     }
 
+    case HVMOP_get_time: {
+        xen_hvm_get_time_t gxt;
+
+        gxt.now = NOW();
+        if ( copy_to_guest(arg, &gxt, 1) )
+            rc = -EFAULT;
+        break;
+    }
+
     default:
     {
         gdprintk(XENLOG_WARNING, "Bad HVM op %ld.\n", op);
diff -r a672af698bc3 -r dc3138d60b40 xen/include/public/hvm/hvm_op.h
--- a/xen/include/public/hvm/hvm_op.h	Fri Jul 09 12:35:58 2010 +0100
+++ b/xen/include/public/hvm/hvm_op.h	Fri Jul 09 14:26:47 2010 +0100
@@ -138,6 +138,14 @@
 typedef struct xen_hvm_pagetable_dying xen_hvm_pagetable_dying_t;
 DEFINE_XEN_GUEST_HANDLE(xen_hvm_pagetable_dying_t);
 
+/* Get the current Xen time, in nanoseconds since system boot. */
+#define HVMOP_get_time              10
+struct xen_hvm_get_time {
+    uint64_t now;      /* OUT */
+};
+typedef struct xen_hvm_get_time xen_hvm_get_time_t;
+DEFINE_XEN_GUEST_HANDLE(xen_hvm_get_time_t);
+
 #endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
 
 #endif /* __XEN_PUBLIC_HVM_HVM_OP_H__ */