KVM: s390: Make the simple ipte mutex specific to a VM instead of global
The ipte-locking should be done for each VM seperately, not globally.
This way we avoid possible congestions when the simple ipte-lock is used
and multiple VMs are running.
Suggested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 0f961a1..c1424e8 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -207,8 +207,6 @@
unsigned long pfra : 52; /* Page-Frame Real Address */
};
-static int ipte_lock_count;
-static DEFINE_MUTEX(ipte_mutex);
int ipte_lock_held(struct kvm_vcpu *vcpu)
{
@@ -216,16 +214,16 @@
if (vcpu->arch.sie_block->eca & 1)
return ic->kh != 0;
- return ipte_lock_count != 0;
+ return vcpu->kvm->arch.ipte_lock_count != 0;
}
static void ipte_lock_simple(struct kvm_vcpu *vcpu)
{
union ipte_control old, new, *ic;
- mutex_lock(&ipte_mutex);
- ipte_lock_count++;
- if (ipte_lock_count > 1)
+ mutex_lock(&vcpu->kvm->arch.ipte_mutex);
+ vcpu->kvm->arch.ipte_lock_count++;
+ if (vcpu->kvm->arch.ipte_lock_count > 1)
goto out;
ic = &vcpu->kvm->arch.sca->ipte_control;
do {
@@ -238,16 +236,16 @@
new.k = 1;
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
out:
- mutex_unlock(&ipte_mutex);
+ mutex_unlock(&vcpu->kvm->arch.ipte_mutex);
}
static void ipte_unlock_simple(struct kvm_vcpu *vcpu)
{
union ipte_control old, new, *ic;
- mutex_lock(&ipte_mutex);
- ipte_lock_count--;
- if (ipte_lock_count)
+ mutex_lock(&vcpu->kvm->arch.ipte_mutex);
+ vcpu->kvm->arch.ipte_lock_count--;
+ if (vcpu->kvm->arch.ipte_lock_count)
goto out;
ic = &vcpu->kvm->arch.sca->ipte_control;
do {
@@ -256,7 +254,7 @@
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
wake_up(&vcpu->kvm->arch.ipte_wq);
out:
- mutex_unlock(&ipte_mutex);
+ mutex_unlock(&vcpu->kvm->arch.ipte_mutex);
}
static void ipte_lock_siif(struct kvm_vcpu *vcpu)