diff mbox series

[v5,3/5] KVM: arm64: Dirty quota-based throttling of vcpus

Message ID 20220912040926.185481-4-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/arm64/kvm/arm.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 2ff0ef62abad..ff17d14aa5b0 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -747,6 +747,15 @@  static int check_vcpu_requests(struct kvm_vcpu *vcpu)
 
 		if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
 			return kvm_vcpu_suspend(vcpu);
+
+		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 0;
+		}
 	}
 
 	return 1;