On arm and arm64, kvm-unit-tests uses the QEMU chr-testdev device to shut
down the virtual machine at the end of a test. The function
psci_system_off() provides another mechanism for terminating the virtual
machine. If the chr-testdev device hasn't been initialized successfully,
then use psci_system_off() to terminate the test instead of
chr_testdev_exit().
chr-testdev is implemented on top of virtio console. This patch makes it
possible for a virtual machine manager which doesn't have support for
chr-testdev, but has been configured not to emulate a virtio console, to
gracefully terminate a virtual machine after a test has been completed.
There is one limitation to using psci_system_off() to terminate a test:
chr-testdev allows kvm-unit-tests to specify an exit code;
psci_system_off() has no such mechanism.
Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
---
lib/arm/io.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/lib/arm/io.c b/lib/arm/io.c
index 87435150f73e..9fe9bd0bf659 100644
--- a/lib/arm/io.c
+++ b/lib/arm/io.c
@@ -11,6 +11,7 @@
#include <libcflat.h>
#include <devicetree.h>
#include <chr-testdev.h>
+#include "arm/asm/psci.h"
#include <asm/spinlock.h>
#include <asm/io.h>
@@ -18,6 +19,8 @@
extern void halt(int code);
+static bool testdev_enabled;
+
/*
* Use this guess for the pl011 base in order to make an attempt at
* having earlier printf support. We'll overwrite it with the real
@@ -65,8 +68,12 @@ static void uart0_init(void)
void io_init(void)
{
+ int err;
+
uart0_init();
- chr_testdev_init();
+ err = chr_testdev_init();
+ if (!err)
+ testdev_enabled = true;
}
void puts(const char *s)
@@ -79,7 +86,10 @@ void puts(const char *s)
void exit(int code)
{
- chr_testdev_exit(code);
+ if (testdev_enabled)
+ chr_testdev_exit(code);
+ else
+ psci_system_off();
halt(code);
__builtin_unreachable();
}
--
2.17.0
