[kvm-unit-tests PATCH v2 14/16] arm/run: Allow Migration tests

[Eric Auger <eric.auger@redhat.com>]

Let's link getchar.o to use puts and getchar from the
tests.

Then allow tests belonging to the migration group to
trigger the migration from the test code by putting
"migrate" into the uart. Then the code can wait for the
migration completion by using getchar().

The __getchar implement is minimalist as it just reads the
data register. It is just meant to read the single character
emitted at the end of the migration by the runner script.

It is not meant to read more data (FIFOs are not enabled).

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 arm/Makefile.common |  2 +-
 arm/run             |  2 +-
 lib/arm/io.c        | 13 +++++++++++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/arm/Makefile.common b/arm/Makefile.common
index 7cc0f04..327f112 100644
--- a/arm/Makefile.common
+++ b/arm/Makefile.common
@@ -32,7 +32,7 @@ CFLAGS += -I $(SRCDIR)/lib -I $(SRCDIR)/lib/libfdt -I lib
 asm-offsets = lib/$(ARCH)/asm-offsets.h
 include $(SRCDIR)/scripts/asm-offsets.mak
 
-cflatobjs += lib/util.o
+cflatobjs += lib/util.o lib/getchar.o
 cflatobjs += lib/alloc_phys.o
 cflatobjs += lib/alloc_page.o
 cflatobjs += lib/vmalloc.o
diff --git a/arm/run b/arm/run
index 277db9b..a390ca5 100755
--- a/arm/run
+++ b/arm/run
@@ -61,6 +61,6 @@ fi
 M+=",accel=$ACCEL"
 command="$qemu -nodefaults $M -cpu $processor $chr_testdev $pci_testdev"
 command+=" -display none -serial stdio -kernel"
-command="$(timeout_cmd) $command"
+command="$(migration_cmd) $(timeout_cmd) $command"
 
 run_qemu $command "$@"
diff --git a/lib/arm/io.c b/lib/arm/io.c
index 99fd315..ed89e19 100644
--- a/lib/arm/io.c
+++ b/lib/arm/io.c
@@ -87,6 +87,19 @@ void puts(const char *s)
 	spin_unlock(&uart_lock);
 }
 
+/*
+ * Minimalist implementation for migration completion detection.
+ * Needs to be improved for more advanced Rx cases
+ */
+int __getchar(void)
+{
+	int ret;
+
+	ret = readb(uart0_base);
+	if (!ret)
+		return -1;
+	return ret;
+}
 
 /*
  * Defining halt to take 'code' as an argument guarantees that it will
-- 
2.20.1