[PATCH v3 1/4] KVM: arm64: selftests: add timer_get_tval() lib function

[Ricardo Koller <ricarkol@google.com>]

Add timer_get_tval() into the arch timer library functions in
selftests/kvm. Bonus: change the set_tval function to get an int32_t
(tval is signed).

Reviewed-by: Oliver Upton <oupton@google.com>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Ricardo Koller <ricarkol@google.com>
---
 .../selftests/kvm/include/aarch64/arch_timer.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
index cb7c03de3a21..93f35a4fc1aa 100644
--- a/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
+++ b/tools/testing/selftests/kvm/include/aarch64/arch_timer.h
@@ -79,7 +79,7 @@ static inline uint64_t timer_get_cval(enum arch_timer timer)
 	return 0;
 }
 
-static inline void timer_set_tval(enum arch_timer timer, uint32_t tval)
+static inline void timer_set_tval(enum arch_timer timer, int32_t tval)
 {
 	switch (timer) {
 	case VIRTUAL:
@@ -95,6 +95,22 @@ static inline void timer_set_tval(enum arch_timer timer, uint32_t tval)
 	isb();
 }
 
+static inline int32_t timer_get_tval(enum arch_timer timer)
+{
+	isb();
+	switch (timer) {
+	case VIRTUAL:
+		return (int32_t)read_sysreg(cntv_tval_el0);
+	case PHYSICAL:
+		return (int32_t)read_sysreg(cntp_tval_el0);
+	default:
+		GUEST_ASSERT_1(0, timer);
+	}
+
+	/* We should not reach here */
+	return 0;
+}
+
 static inline void timer_set_ctl(enum arch_timer timer, uint32_t ctl)
 {
 	switch (timer) {
-- 
2.35.1.894.gb6a874cedc-goog