For some tests we would like to force a guest exit to stress the
context switching code. This adds a MMIO register that when accessed
ignores any read or write, and implements a vm_exit() function for
guests to call when they need to force an exit to the host.
---
tools/testing/selftests/kvm/arm/guest-base.S | 6 ++++++
tools/testing/selftests/kvm/arm/guest-driver.c | 3 +++
tools/testing/selftests/kvm/arm/guest.h | 1 +
tools/testing/selftests/kvm/arm/io_common.h | 2 ++
4 files changed, 12 insertions(+)
diff --git a/tools/testing/selftests/kvm/arm/guest-base.S b/tools/testing/selftests/kvm/arm/guest-base.S
index a992554f..f5930fb 100644
--- a/tools/testing/selftests/kvm/arm/guest-base.S
+++ b/tools/testing/selftests/kvm/arm/guest-base.S
@@ -55,6 +55,12 @@ putc:
strb r0, [r1]
mov pc, lr
+.globl vm_exit
+vm_exit:
+ ldr r1, =IO_CTL_STUB
+ strb r0, [r1]
+ mov pc, lr
+
.section .text.extable
b impossible
b undef
diff --git a/tools/testing/selftests/kvm/arm/guest-driver.c b/tools/testing/selftests/kvm/arm/guest-driver.c
index efd7009..da03f28 100644
--- a/tools/testing/selftests/kvm/arm/guest-driver.c
+++ b/tools/testing/selftests/kvm/arm/guest-driver.c
@@ -210,6 +210,9 @@ static bool handle_mmio(struct kvm_run *kvm_run,
printf("%c", data[0]);
return false;
+ case IO_CTL_STUB:
+ return false;
+
case IO_CTL_EXIT:
printf("VM shutting down status %i\n", data[0]);
if (data[0] != 0)
diff --git a/tools/testing/selftests/kvm/arm/guest.h b/tools/testing/selftests/kvm/arm/guest.h
index e857440..40a2eb2 100644
--- a/tools/testing/selftests/kvm/arm/guest.h
+++ b/tools/testing/selftests/kvm/arm/guest.h
@@ -6,6 +6,7 @@
void ok(void);
void fail(void);
void putc(char c);
+void vm_exit(void);
extern int skip_undef, undef_count;
static inline void print(const char *p)
diff --git a/tools/testing/selftests/kvm/arm/io_common.h b/tools/testing/selftests/kvm/arm/io_common.h
index d6c8c37..9ca4f31 100644
--- a/tools/testing/selftests/kvm/arm/io_common.h
+++ b/tools/testing/selftests/kvm/arm/io_common.h
@@ -7,5 +7,7 @@
#define IO_CTL_EXIT (0xf0000001)
/* print a character */
#define IO_CTL_PRINT (0xf0000002)
+/* Stub MMIO operation, will cause a guest exit */
+#define IO_CTL_STUB (0xf0000003)
#endif /* __IO_DATA_H */
--
1.7.9.5
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
