[PATCH v1 02/11] KVM: s390: Use srcu in kvm_arch_vcpu_unlocked_ioctl()

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

kvm_arch_vcpu_unlocked_ioctl() is called without further locks held, but
kvm_s390_inject_vcpu(), which is called from there, needs either the
kvm->srcu or the slots lock.

Fix by taking the kvm->srcu in kvm_arch_vcpu_unlocked_ioctl().

Fixes: ba5c1e9b6cee ("KVM: s390: interrupt subsystem, cpu timer, waitpsw")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 arch/s390/kvm/kvm-s390.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 518a69c55e85..02c5428ba239 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5444,6 +5444,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,
 	void __user *argp = (void __user *)arg;
 	int rc;
 
+	guard(srcu)(&vcpu->kvm->srcu);
+
 	switch (ioctl) {
 	case KVM_S390_IRQ: {
 		struct kvm_s390_irq s390irq;
-- 
2.55.0