[kvm-unit-tests RFC PATCH 16/16] arm64: timer: Run tests with VHE disabled

[Alexandru Elisei <alexandru.elisei@arm.com>]

Disable VHE if first command line parameter is "nvhe" and then test the
timers. Just like with VHE enabled, if no other parameter is given, all
four timers are tested; otherwise, only the timers specified by the user.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 lib/arm64/asm/processor.h |  2 ++
 arm/timer.c               | 33 +++++++++++++++++++++++++++++----
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/lib/arm64/asm/processor.h b/lib/arm64/asm/processor.h
index 4d12913ca01f..36260a942795 100644
--- a/lib/arm64/asm/processor.h
+++ b/lib/arm64/asm/processor.h
@@ -26,6 +26,8 @@
 #define HCR_EL2_TGE		(1 << 27)
 #define HCR_EL2_E2H_SHIFT	34
 #define HCR_EL2_E2H		(UL(1) << 34)
+#define HCR_EL2_IMO		(1 << 4)
+#define HCR_EL2_FMO		(1 << 3)
 
 #define SCTLR_EL2_RES1		(3 << 28 | 3 << 22 | 1 << 18 |	\
 				 1 << 16 | 1 << 11 | 3 << 4)
diff --git a/arm/timer.c b/arm/timer.c
index faab671d0fb1..6b9d5d57a658 100644
--- a/arm/timer.c
+++ b/arm/timer.c
@@ -464,19 +464,34 @@ static void test_hptimer(void)
 	report_prefix_pop();
 }
 
-static void test_init(void)
+static void test_init(bool without_vhe)
 {
 	const struct fdt_property *prop;
 	const void *fdt = dt_fdt();
+	u64 hcr;
 	int node, len;
 	u32 *data;
 
+	if (without_vhe) {
+		disable_vhe();
+		hcr = read_sysreg(hcr_el2);
+		/* KVM doesn't support different IMO/FMO settings */
+		hcr |= HCR_EL2_IMO | HCR_EL2_FMO;
+		write_sysreg(hcr, hcr_el2);
+		isb();
+	}
+
 	if (current_el == CurrentEL_EL1) {
 		vtimer = &vtimer_info;
 		ptimer = &ptimer_info;
 	} else {
-		vtimer = &vtimer_info_vhe;
-		ptimer = &ptimer_info_vhe;
+		if (without_vhe) {
+			vtimer = &vtimer_info;
+			ptimer = &ptimer_info;
+		} else {
+			vtimer = &vtimer_info_vhe;
+			ptimer = &ptimer_info_vhe;
+		}
 		hvtimer = &hvtimer_info;
 		hptimer = &hptimer_info;
 	}
@@ -563,10 +578,20 @@ static void print_timer_info(void)
 int main(int argc, char **argv)
 {
 	int i;
+	bool without_vhe = false;
 
 	current_el = current_level();
 
-	test_init();
+	if (argc > 1 && strcmp(argv[1], "nvhe") == 0) {
+		if (current_el == CurrentEL_EL1)
+			report_info("Skipping EL2 tests. Boot at EL2 to enable.");
+		else
+			without_vhe = true;
+		argv = &argv[1];
+		argc--;
+	}
+
+	test_init(without_vhe);
 
 	print_timer_info();
 
-- 
2.7.4

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