From e3326ae3d59e443a379367c6936941d6ab55d316 Mon Sep 17 00:00:00 2001 From: Laurent Dufour Date: Wed, 20 May 2020 19:43:08 +0200 Subject: KVM: PPC: Book3S HV: Relax check on H_SVM_INIT_ABORT The commit 8c47b6ff29e3 ("KVM: PPC: Book3S HV: Check caller of H_SVM_* Hcalls") added checks of secure bit of SRR1 to filter out the Hcall reserved to the Ultravisor. However, the Hcall H_SVM_INIT_ABORT is made by the Ultravisor passing the context of the VM calling UV_ESM. This allows the Hypervisor to return to the guest without going through the Ultravisor. Thus the Secure bit of SRR1 is not set in that particular case. In the case a regular VM is calling H_SVM_INIT_ABORT, this hcall will be filtered out in kvmppc_h_svm_init_abort() because kvm->arch.secure_guest is not set in that case. Fixes: 8c47b6ff29e3 ("KVM: PPC: Book3S HV: Check caller of H_SVM_* Hcalls") Signed-off-by: Laurent Dufour Reviewed-by: Greg Kurz Reviewed-by: Ram Pai Signed-off-by: Paul Mackerras --- arch/powerpc/kvm/book3s_hv.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'arch/powerpc/kvm') diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index e9aa5555d690..1b84806abef6 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -1097,9 +1097,14 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) ret = kvmppc_h_svm_init_done(vcpu->kvm); break; case H_SVM_INIT_ABORT: - ret = H_UNSUPPORTED; - if (kvmppc_get_srr1(vcpu) & MSR_S) - ret = kvmppc_h_svm_init_abort(vcpu->kvm); + /* + * Even if that call is made by the Ultravisor, the SSR1 value + * is the guest context one, with the secure bit clear as it has + * not yet been secured. So we can't check it here. + * Instead the kvm->arch.secure_guest flag is checked inside + * kvmppc_h_svm_init_abort(). + */ + ret = kvmppc_h_svm_init_abort(vcpu->kvm); break; default: -- cgit v1.2.3