linux-kernel - [PATCH] selftests/kvm: Use num_vcpus when testing ICR in the xapic_state

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Date:   Sat,  3 Sep 2022 13:09:01 +0530
From:   Gautam Menghani <gautammenghani201@...il.com>
To:     pbonzini@...hat.com, shuah@...nel.org
Cc:     Gautam Menghani <gautammenghani201@...il.com>, seanjc@...gle.com,
        guang.zeng@...el.com, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH] selftests/kvm: Use num_vcpus when testing ICR in the xapic_state_test

A TODO in xapic_state_test asks to use number of vCPUs instead of
vcpu.id + 1 in test_icr(). This patch adds support to get the number 
of vCPUs from the VM created and use it.

Signed-off-by: Gautam Menghani <gautammenghani201@...il.com>
---
 .../selftests/kvm/x86_64/xapic_state_test.c     | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
index 6f7a5ef66718..de934e8e5e41 100644
--- a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
@@ -96,9 +96,8 @@ static void __test_icr(struct xapic_vcpu *x, uint64_t val)
 	____test_icr(x, val & ~(u64)APIC_ICR_BUSY);
 }
 
-static void test_icr(struct xapic_vcpu *x)
+static void test_icr(struct xapic_vcpu *x, int num_vcpus)
 {
-	struct kvm_vcpu *vcpu = x->vcpu;
 	uint64_t icr, i, j;
 
 	icr = APIC_DEST_SELF | APIC_INT_ASSERT | APIC_DM_FIXED;
@@ -110,11 +109,11 @@ static void test_icr(struct xapic_vcpu *x)
 		__test_icr(x, icr | i);
 
 	/*
-	 * Send all flavors of IPIs to non-existent vCPUs.  TODO: use number of
-	 * vCPUs, not vcpu.id + 1.  Arbitrarily use vector 0xff.
+	 * Send all flavors of IPIs to non-existent vCPUs. Arbitrarily use vector 0xff.
 	 */
+
 	icr = APIC_INT_ASSERT | 0xff;
-	for (i = vcpu->id + 1; i < 0xff; i++) {
+	for (i = num_vcpus; i < 0xff; i++) {
 		for (j = 0; j < 8; j++)
 			__test_icr(x, i << (32 + 24) | icr | (j << 8));
 	}
@@ -137,9 +136,13 @@ int main(int argc, char *argv[])
 		.is_x2apic = true,
 	};
 	struct kvm_vm *vm;
+	struct list_head *iter;
+	int nr_vcpus_created = 0;
 
 	vm = vm_create_with_one_vcpu(&x.vcpu, x2apic_guest_code);
-	test_icr(&x);
+	list_for_each(iter, &vm->vcpus)
+		nr_vcpus_created++;
+	test_icr(&x, nr_vcpus_created);
 	kvm_vm_free(vm);
 
 	/*
@@ -153,6 +156,6 @@ int main(int argc, char *argv[])
 	vcpu_clear_cpuid_feature(x.vcpu, X86_FEATURE_X2APIC);
 
 	virt_pg_map(vm, APIC_DEFAULT_GPA, APIC_DEFAULT_GPA);
-	test_icr(&x);
+	test_icr(&x, nr_vcpus_created);
 	kvm_vm_free(vm);
 }
-- 
2.34.1