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authorHollis Blanchard <hollisb@us.ibm.com>2008-11-24 11:37:38 -0600
committerAvi Kivity <avi@redhat.com>2008-11-25 12:02:48 +0200
commitc30f8a6c6d74f67bc2107726cc61a1e7c71e9740 (patch)
treecc593db75efd62f917e949df78f4fabdcddc6938 /arch/powerpc
parent0c0f40bdbe4ddb48ebecfb5c2b56eeb175a57c45 (diff)
downloadlinux-c30f8a6c6d74f67bc2107726cc61a1e7c71e9740.tar.bz2
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 <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/kvm_ppc.h2
-rw-r--r--arch/powerpc/kvm/44x_tlb.c8
-rw-r--r--arch/powerpc/kvm/powerpc.c1
3 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 8931ba729d2b..bb62ad876de3 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 2e227a412bc2..ad72c6f9811f 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 90a6fc422b23..fda9baada132 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