commit 69a09dc1742ffbb3b02f3a1e03da4801e96452e9
author Rusty Russell <rusty@rustcorp.com.au> Wed Feb 11 15:15:09 2015 +1030
committer Rusty Russell <rusty@rustcorp.com.au> Wed Feb 11 16:47:30 2015 +1030
tree c9887c6b6150810ba103b76cf9d4376af3edd5e5
parent 18c137371b2ea86d263b75665a4904a0b8872990

lguest: write more information to userspace about pending traps.

This is preparation for userspace handling MMIO and ioport accesses.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

tools/lguest/lguest.c

diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index 3f7f232..0e754d0 100644
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -1820,17 +1820,21 @@
 static void __attribute__((noreturn)) run_guest(void)
 {
 	for (;;) {
-		unsigned long notify_addr;
+		struct lguest_pending notify;
 		int readval;
 
 		/* We read from the /dev/lguest device to run the Guest. */
-		readval = pread(lguest_fd, &notify_addr,
-				sizeof(notify_addr), cpu_id);
+		readval = pread(lguest_fd, &notify, sizeof(notify), cpu_id);
 
 		/* One unsigned long means the Guest did HCALL_NOTIFY */
-		if (readval == sizeof(notify_addr)) {
-			verbose("Notify on address %#lx\n", notify_addr);
-			handle_output(notify_addr);
+		if (readval == sizeof(notify)) {
+			if (notify.trap == 0x1F) {
+				verbose("Notify on address %#08x\n",
+					notify.addr);
+				handle_output(notify.addr);
+			} else
+				errx(1, "Unknown trap %i addr %#08x\n",
+				     notify.trap, notify.addr);
 		/* ENOENT means the Guest died.  Reading tells us why. */
 		} else if (errno == ENOENT) {
 			char reason[1024] = { 0 };