X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Flguest%2Fhypercalls.c;h=db6caace3b9c22a7ce16a85580de212d318c4cd2;hb=203f3394397642f2f9d9ee760f03420459b7a8ef;hp=7a5299f9679ddcbe083cb7b16657ecc22cf1e2aa;hpb=257f49251c802c67030c11f63cee4ed7b50f6639;p=linux-2.6

diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c
index 7a5299f967..db6caace3b 100644
--- a/drivers/lguest/hypercalls.c
+++ b/drivers/lguest/hypercalls.c
@@ -64,14 +64,6 @@ static void do_hcall(struct lguest *lg, struct lguest_regs *regs)
 		else
 			guest_pagetable_flush_user(lg);
 		break;
-	case LHCALL_GET_WALLCLOCK: {
-		/* The Guest wants to know the real time in seconds since 1970,
-		 * in good Unix tradition. */
-		struct timespec ts;
-		ktime_get_real_ts(&ts);
-		regs->eax = ts.tv_sec;
-		break;
-	}
 	case LHCALL_BIND_DMA:
 		/* BIND_DMA really wants four arguments, but it's the only call
 		 * which does.  So the Guest packs the number of buffers and
@@ -235,6 +227,9 @@ static void initialize(struct lguest *lg)
 	    || put_user(lg->guestid, &lg->lguest_data->guestid))
 		kill_guest(lg, "bad guest page %p", lg->lguest_data);
 
+	/* We write the current time into the Guest's data page once now. */
+	write_timestamp(lg);
+
 	/* This is the one case where the above accesses might have been the
 	 * first write to a Guest page.  This may have caused a copy-on-write
 	 * fault, but the Guest might be referring to the old (read-only)
@@ -293,3 +288,13 @@ void do_hypercalls(struct lguest *lg)
 		clear_hcall(lg);
 	}
 }
+
+/* This routine supplies the Guest with time: it's used for wallclock time at
+ * initial boot and as a rough time source if the TSC isn't available. */
+void write_timestamp(struct lguest *lg)
+{
+	struct timespec now;
+	ktime_get_real_ts(&now);
+	if (put_user(now, &lg->lguest_data->time))
+		kill_guest(lg, "Writing timestamp");
+}