diff options
| author | Alexander Graf <agraf@suse.de> | 2010-07-29 14:47:42 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-10-24 10:50:42 +0200 |
| commit | 96bc451a153297bf1f99ef2d633d512ea349ae7a (patch) | |
| tree | 75ab4d40387ea1295a23b180e4c8719ce7053d00 /arch/powerpc/kvm/book3s.c | |
| parent | 34698d8c61bd3fc86b2e99c3d1ad9ef140b3eb0d (diff) | |
| download | linux-96bc451a153297bf1f99ef2d633d512ea349ae7a.tar.gz linux-96bc451a153297bf1f99ef2d633d512ea349ae7a.tar.bz2 linux-96bc451a153297bf1f99ef2d633d512ea349ae7a.zip | |
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 <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/book3s.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index a3cef30d1d42..b3385dd6f28d 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -1242,6 +1242,10 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) if (err) goto free_shadow_vcpu; + vcpu->arch.shared = (void*)__get_free_page(GFP_KERNEL|__GFP_ZERO); + if (!vcpu->arch.shared) + goto uninit_vcpu; + vcpu->arch.host_retip = kvm_return_point; vcpu->arch.host_msr = mfmsr(); #ifdef CONFIG_PPC_BOOK3S_64 @@ -1268,10 +1272,12 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id) err = kvmppc_mmu_init(vcpu); if (err < 0) - goto free_shadow_vcpu; + goto uninit_vcpu; return vcpu; +uninit_vcpu: + kvm_vcpu_uninit(vcpu); free_shadow_vcpu: kfree(vcpu_book3s->shadow_vcpu); free_vcpu: @@ -1284,6 +1290,7 @@ void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu) { struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu); + free_page((unsigned long)vcpu->arch.shared); kvm_vcpu_uninit(vcpu); kfree(vcpu_book3s->shadow_vcpu); vfree(vcpu_book3s); |