From 96bc451a153297bf1f99ef2d633d512ea349ae7a Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 29 Jul 2010 14:47:42 +0200 Subject: KVM: PPC: Introduce shared page For transparent variable sharing between the hypervisor and guest, I introduce a shared page. This shared page will contain all the registers the guest can read and write safely without exiting guest context. This patch only implements the stubs required for the basic structure of the shared page. The actual register moving follows. Signed-off-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/powerpc/kvm/e500.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/powerpc/kvm/e500.c') diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c index e8a00b0c4449..71750f2dd5d3 100644 --- a/arch/powerpc/kvm/e500.c +++ b/arch/powerpc/kvm/e500.c @@ -117,8 +117,14 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) if (err) goto uninit_vcpu; + vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO); + if (!vcpu->arch.shared) + goto uninit_tlb; + return vcpu; +uninit_tlb: + kvmppc_e500_tlb_uninit(vcpu_e500); uninit_vcpu: kvm_vcpu_uninit(vcpu); free_vcpu: @@ -131,6 +137,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); + free_page((unsigned long)vcpu->arch.shared); kvmppc_e500_tlb_uninit(vcpu_e500); kvm_vcpu_uninit(vcpu); kmem_cache_free(kvm_vcpu_cache, vcpu_e500); -- cgit v1.2.3