[PATCH v7 37/38] KVM: arm64: selftests: Test with every breakpoint/watchpoint

[Reiji Watanabe]

Add test cases that uses every breakpoint/watchpoint to the
debug-exceptions test.

Signed-off-by: Reiji Watanabe <reijiw at google.com>
---
 .../selftests/kvm/aarch64/debug-exceptions.c  | 70 ++++++++++++++++---
 1 file changed, 59 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
index 4e00100b9aa1..829fad6c7d58 100644
--- a/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
+++ b/tools/testing/selftests/kvm/aarch64/debug-exceptions.c
@@ -701,7 +701,7 @@ static void check_debug_regs(struct kvm_vm *vm, uint32_t vcpu,
 	}
 }
 
-int main(int argc, char *argv[])
+void run_test(uint8_t bpn, uint8_t wpn, uint8_t ctx_bpn)
 {
 	struct kvm_vm *vm;
 	struct ucall uc;
@@ -710,6 +710,8 @@ int main(int argc, char *argv[])
 	uint8_t nbps, nwps;
 	bool debug_reg_test = false;
 
+	pr_debug("%s bpn:%d, wpn:%d, ctx_bpn:%d\n", __func__, bpn, wpn, ctx_bpn);
+
 	vm = vm_create_default(VCPU_ID, 0, guest_code);
 	ucall_init(vm, NULL);
 
@@ -717,11 +719,6 @@ int main(int argc, char *argv[])
 	vcpu_init_descriptor_tables(vm, VCPU_ID);
 
 	get_reg(vm, VCPU_ID, KVM_ARM64_SYS_REG(SYS_ID_AA64DFR0_EL1), &aa64dfr0);
-	if (cpuid_extract_uftr(aa64dfr0, ID_AA64DFR0_DEBUGVER_SHIFT) < 6) {
-		print_skip("Armv8 debug architecture not supported.");
-		kvm_vm_free(vm);
-		exit(KSFT_SKIP);
-	}
 
 	vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
 				ESR_EC_BRK_INS, guest_sw_bp_handler);
@@ -742,11 +739,7 @@ int main(int argc, char *argv[])
 	nwps = cpuid_extract_uftr(aa64dfr0, ID_AA64DFR0_WRPS_SHIFT) + 1;
 	TEST_ASSERT(nwps >= 2, "Number of watchpoints must be >= 2");
 
-	/*
-	 * Test with breakpoint#0 and watchpoint#0, and the higiest
-	 * numbered breakpoint (the context aware breakpoint).
-	 */
-	vcpu_args_set(vm, VCPU_ID, 4, &debug_regs, 0, 0, nbps - 1);
+	vcpu_args_set(vm, VCPU_ID, 4, &debug_regs, bpn, wpn, ctx_bpn);
 
 	for (stage = 0; stage < 13; stage++) {
 		/* First two stages are sanity debug regs read/write check */
@@ -783,5 +776,60 @@ int main(int argc, char *argv[])
 
 done:
 	kvm_vm_free(vm);
+}
+
+/*
+ * Run debug testing using the various breakpoint#, watchpoint# and
+ * context-aware breakpoint# with the given ID_AA64DFR0_EL1 configuration.
+ */
+void test_debug(uint64_t aa64dfr0)
+{
+	uint8_t brps, wrps, ctx_cmps;
+	uint8_t normal_brp_num, wrp_num, ctx_brp_base, ctx_brp_num;
+	int b, w, c;
+
+	brps = cpuid_extract_uftr(aa64dfr0, ID_AA64DFR0_BRPS_SHIFT);
+	wrps = cpuid_extract_uftr(aa64dfr0, ID_AA64DFR0_WRPS_SHIFT);
+	ctx_cmps = cpuid_extract_uftr(aa64dfr0, ID_AA64DFR0_CTX_CMPS_SHIFT);
+
+	pr_debug("%s brps:%d, wrps:%d, ctx_cmps:%d\n", __func__,
+		 brps, wrps, ctx_cmps);
+
+	/* Number of normal (non-context aware) breakpoints */
+	normal_brp_num = brps - ctx_cmps;
+
+	/* Number of watchpoints */
+	wrp_num = wrps + 1;
+
+	/* Number of context aware breakpoints */
+	ctx_brp_num = ctx_cmps + 1;
+
+	/* Lowest context aware breakpoint number */
+	ctx_brp_base = normal_brp_num;
+
+	for (c = ctx_brp_base; c < ctx_brp_base + ctx_brp_num; c++) {
+		for (b = 0; b < normal_brp_num; b++) {
+			for (w = 0; w < wrp_num; w++)
+				run_test(b, w, c);
+		}
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vm *vm;
+	uint64_t aa64dfr0;
+
+	vm = vm_create_default(VCPU_ID, 0, guest_code);
+	get_reg(vm, VCPU_ID, KVM_ARM64_SYS_REG(SYS_ID_AA64DFR0_EL1), &aa64dfr0);
+	kvm_vm_free(vm);
+
+	if (cpuid_extract_uftr(aa64dfr0, ID_AA64DFR0_DEBUGVER_SHIFT) < 6) {
+		print_skip("Armv8 debug architecture not supported.");
+		exit(KSFT_SKIP);
+	}
+
+	/* Run debug tests with the default configuration */
+	test_debug(aa64dfr0);
 	return 0;
 }
-- 
2.36.0.rc0.470.gd361397f0d-goog