diff mbox series

[v5,4/5] KVM: s390x: Dirty quota-based throttling of vcpus

Message ID 20220912040926.185481-5-shivam.kumar1@nutanix.com (mailing list archive)
State New, archived
Headers show
Series KVM: Dirty quota-based throttling | expand

Commit Message

Shivam Kumar Sept. 12, 2022, 4:09 a.m. UTC 
Exit to userspace whenever the dirty quota is exhausted (i.e. dirty count
equals/exceeds dirty quota) to request more dirty quota.

Suggested-by: Shaju Abraham <shaju.abraham@nutanix.com>
Suggested-by: Manish Mishra <manish.mishra@nutanix.com>
Co-developed-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Shivam Kumar <shivam.kumar1@nutanix.com>
---
 arch/s390/kvm/kvm-s390.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index edfd4bbd0cba..2fe2933a7064 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4343,6 +4343,15 @@  static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
 		goto retry;
 	}
 
+	if (kvm_check_request(KVM_REQ_DIRTY_QUOTA_EXIT, vcpu)) {
+		struct kvm_run *run = vcpu->run;
+
+		run->exit_reason = KVM_EXIT_DIRTY_QUOTA_EXHAUSTED;
+		run->dirty_quota_exit.count = vcpu->stat.generic.pages_dirtied;
+		run->dirty_quota_exit.quota = vcpu->dirty_quota;
+		return 1;
+	}
+
 	/* nothing to do, just clear the request */
 	kvm_clear_request(KVM_REQ_UNHALT, vcpu);
 	/* we left the vsie handler, nothing to do, just clear the request */