linux-kernel - [PATCH] selftests/kvm: Avoid for loop initialization using vcpu->id in xapic_state

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Message-Id: <20221001092443.18927-1-gautammenghani201@gmail.com>
Date:   Sat,  1 Oct 2022 14:54:43 +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
Subject: [PATCH] selftests/kvm: Avoid for loop initialization using vcpu->id in xapic_state_test

In the test_icr() function in xapic_state_test, one of the for loops is
initialized with vcpu->id. Fix this assumption that vcpu->id is 0 so
that IPIs are correctly sent to non-existent vCPUs [1].

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Gautam Menghani <gautammenghani201@...il.com>
---
[1] https://lore.kernel.org/kvm/YyoZr9rXSSMEtdh5@google.com/

 tools/testing/selftests/kvm/x86_64/xapic_state_test.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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..d7d37dae3eeb 100644
--- a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
@@ -114,7 +114,9 @@ static void test_icr(struct xapic_vcpu *x)
 	 * vCPUs, not vcpu.id + 1.  Arbitrarily use vector 0xff.
 	 */
 	icr = APIC_INT_ASSERT | 0xff;
-	for (i = vcpu->id + 1; i < 0xff; i++) {
+	for (i = 0; i < 0xff; i++) {
+		if (i == vcpu->id)
+			continue;
 		for (j = 0; j < 8; j++)
 			__test_icr(x, i << (32 + 24) | icr | (j << 8));
 	}
-- 
2.34.1