From: Avi Kivity <avi@qumranet.com>
Date: Wed, 4 Jun 2008 15:42:24 +0000 (+0300)
Subject: KVM: MMU: reschedule during shadow teardown
X-Git-Tag: firefly_0821_release~19983^2~3
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8d2d73b9a5c35f2c6abf427afba7888cfc4cc65d;p=firefly-linux-kernel-4.4.55.git

KVM: MMU: reschedule during shadow teardown

Shadows for large guests can take a long time to tear down, so reschedule
occasionally to avoid softlockup warnings.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 7246b60afb96..c2fd6a4a58c3 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1858,6 +1858,7 @@ static void free_mmu_pages(struct kvm_vcpu *vcpu)
 		sp = container_of(vcpu->kvm->arch.active_mmu_pages.next,
 				  struct kvm_mmu_page, link);
 		kvm_mmu_zap_page(vcpu->kvm, sp);
+		cond_resched();
 	}
 	free_page((unsigned long)vcpu->arch.mmu.pae_root);
 }