linux-kernel - [PATCH v4 12/18] KVM: selftests: Keep track of the number of vCPUs for a VM

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Date:   Thu,  9 Sep 2021 01:38:12 +0000
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Andrew Jones <drjones@...hat.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Raghavendra Rao Anata <rananta@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v4 12/18] KVM: selftests: Keep track of the number of vCPUs
 for a VM

The host may want to know the number of vCPUs that were
created for a particular VM (used in upcoming patches).
Hence, include nr_vcpus as a part of 'struct kvm_vm' to
keep track of vCPUs as and when they are added or
deleted, and return to the caller via vm_get_nr_vcpus().

Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
 tools/testing/selftests/kvm/include/kvm_util.h      | 1 +
 tools/testing/selftests/kvm/lib/kvm_util.c          | 7 +++++++
 tools/testing/selftests/kvm/lib/kvm_util_internal.h | 1 +
 3 files changed, 9 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 010b59b13917..d5d0ca919928 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -399,5 +399,6 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
 
 int vm_get_stats_fd(struct kvm_vm *vm);
 int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid);
+int vm_get_nr_vcpus(struct kvm_vm *vm);
 
 #endif /* SELFTEST_KVM_UTIL_H */
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 10a8ed691c66..1b5349b5132f 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -594,6 +594,7 @@ static void vm_vcpu_rm(struct kvm_vm *vm, struct vcpu *vcpu)
 
 	list_del(&vcpu->list);
 	free(vcpu);
+	vm->nr_vcpus--;
 }
 
 void kvm_vm_release(struct kvm_vm *vmp)
@@ -1143,6 +1144,7 @@ void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid)
 
 	/* Add to linked-list of VCPUs. */
 	list_add(&vcpu->list, &vm->vcpus);
+	vm->nr_vcpus++;
 }
 
 /*
@@ -2343,3 +2345,8 @@ int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid)
 
 	return ioctl(vcpu->fd, KVM_GET_STATS_FD, NULL);
 }
+
+int vm_get_nr_vcpus(struct kvm_vm *vm)
+{
+	return vm->nr_vcpus;
+}
diff --git a/tools/testing/selftests/kvm/lib/kvm_util_internal.h b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
index a03febc24ba6..be4d852d2f3b 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util_internal.h
+++ b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
@@ -56,6 +56,7 @@ struct kvm_vm {
 	unsigned int va_bits;
 	uint64_t max_gfn;
 	struct list_head vcpus;
+	int nr_vcpus;
 	struct userspace_mem_regions regions;
 	struct sparsebit *vpages_valid;
 	struct sparsebit *vpages_mapped;
-- 
2.33.0.153.gba50c8fa24-goog