linux-kernel - [PATCH 3/5] selftests: KVM: Introduce vcpu_run

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Message-Id: <20220802230718.1891356-4-mizhang@google.com>
Date:   Tue,  2 Aug 2022 23:07:16 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>
Subject: [PATCH 3/5] selftests: KVM: Introduce vcpu_run_interruptable()

Introduce vcpu_run_interruptable() to allow selftests execute their own
code when a vcpu is kicked out of KVM_RUN on receiving a POSIX signal.

This function gives selftests the flexibility to execute their own logic
especially when a vCPU is halted. Note that vcpu_run_complete_io() almost
achieves the same effect. However, it explicitly disallows the case of
returning to caller when errno is EINTR.

Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 tools/testing/selftests/kvm/include/kvm_util_base.h |  2 ++
 tools/testing/selftests/kvm/lib/kvm_util.c          | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index ac883b8eab57..cfb91c63d8c3 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -398,6 +398,8 @@ static inline int __vcpu_run(struct kvm_vcpu *vcpu)
 	return __vcpu_ioctl(vcpu, KVM_RUN, NULL);
 }
 
+int vcpu_run_interruptable(struct kvm_vcpu *vcpu);
+
 void vcpu_run_complete_io(struct kvm_vcpu *vcpu);
 struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vcpu *vcpu);
 
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 9889fe0d8919..aca418ce4e8c 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -1406,6 +1406,17 @@ void vm_create_irqchip(struct kvm_vm *vm)
 	vm->has_irqchip = true;
 }
 
+int vcpu_run_interruptable(struct kvm_vcpu *vcpu)
+{
+	int rc;
+
+	rc = __vcpu_run(vcpu);
+
+	vcpu->run->immediate_exit = 0;
+
+	return rc;
+}
+
 int _vcpu_run(struct kvm_vcpu *vcpu)
 {
 	int rc;
-- 
2.37.1.455.g008518b4e5-goog