linux-kernel - [RFC PATCH v2 03/11] KVM: Introduce kvm_vm_has_run

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Date:   Sat, 13 Nov 2021 01:22:26 +0000
From:   Raghavendra Rao Ananta <rananta@...gle.com>
To:     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:     Paolo Bonzini <pbonzini@...hat.com>,
        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: [RFC PATCH v2 03/11] KVM: Introduce kvm_vm_has_run_once

The upcoming patches need a way to detect if the VM, as
a whole, has started. Hence, unionize kvm_vcpu_has_run_once()
of all the vcpus of the VM and build kvm_vm_has_run_once()
to achieve the functionality.

No functional change intended.

Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
---
 include/linux/kvm_host.h |  2 ++
 virt/kvm/kvm_main.c      | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b373929c71eb..102e00c0e21c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1854,4 +1854,6 @@ static inline bool kvm_vcpu_has_run_once(struct kvm_vcpu *vcpu)
 	return vcpu->has_run_once;
 }
 
+bool kvm_vm_has_run_once(struct kvm *kvm);
+
 #endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1ec8a8e959b2..3d8d96e8f61d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -4339,6 +4339,23 @@ static int kvm_vm_ioctl_get_stats_fd(struct kvm *kvm)
 	return fd;
 }
 
+bool kvm_vm_has_run_once(struct kvm *kvm)
+{
+	int i, ret = false;
+	struct kvm_vcpu *vcpu;
+
+	mutex_lock(&kvm->lock);
+
+	kvm_for_each_vcpu(i, vcpu, kvm) {
+		ret = kvm_vcpu_has_run_once(vcpu);
+		if (ret)
+			break;
+	}
+
+	mutex_unlock(&kvm->lock);
+	return ret;
+}
+
 static long kvm_vm_ioctl(struct file *filp,
 			   unsigned int ioctl, unsigned long arg)
 {
-- 
2.34.0.rc1.387.gb447b232ab-goog