From c30f8a6c6d74f67bc2107726cc61a1e7c71e9740 Mon Sep 17 00:00:00 2001 From: Hollis Blanchard Date: Mon, 24 Nov 2008 11:37:38 -0600 Subject: [PATCH] KVM: ppc: stop leaking host memory on VM exit When the VM exits, we must call put_page() for every page referenced in the shadow TLB. Without this patch, we usually leak 30-50 host pages (120 - 200 KiB with 4 KiB pages). The maximum number of pages leaked is the size of our shadow TLB, 64 pages. Signed-off-by: Hollis Blanchard Signed-off-by: Avi Kivity --- arch/powerpc/include/asm/kvm_ppc.h | 2 ++ arch/powerpc/kvm/44x_tlb.c | 8 ++++++++ arch/powerpc/kvm/powerpc.c | 1 + 3 files changed, 11 insertions(+) diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 8931ba7..bb62ad8 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -104,4 +104,6 @@ static inline void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 new_pid) } } +extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu); + #endif /* __POWERPC_KVM_PPC_H__ */ diff --git a/arch/powerpc/kvm/44x_tlb.c b/arch/powerpc/kvm/44x_tlb.c index 2e227a4..ad72c6f 100644 --- a/arch/powerpc/kvm/44x_tlb.c +++ b/arch/powerpc/kvm/44x_tlb.c @@ -124,6 +124,14 @@ static void kvmppc_44x_shadow_release(struct kvm_vcpu *vcpu, } } +void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu) +{ + int i; + + for (i = 0; i <= tlb_44x_hwater; i++) + kvmppc_44x_shadow_release(vcpu, i); +} + void kvmppc_tlbe_set_modified(struct kvm_vcpu *vcpu, unsigned int i) { vcpu->arch.shadow_tlb_mod[i] = 1; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 90a6fc4..fda9baa 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -238,6 +238,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) { + kvmppc_core_destroy_mmu(vcpu); } /* Note: clearing MSR[DE] just means that the debug interrupt will not be -- 2.7.4