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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>
hifive-unleashed-5.1
Hollis Blanchard 2008-11-24 11:37:38 -06:00 committed by Avi Kivity
parent 0c0f40bdbe
commit c30f8a6c6d
3 changed files with 11 additions and 0 deletions
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2
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -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__ */

8
arch/powerpc/kvm/44x_tlb.c
View File

@ -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;

1
arch/powerpc/kvm/powerpc.c
View File

@ -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