From: Laurent Dufour ldufour@linux.ibm.com
[ Upstream commit 377f02d487b5f74a2411fa01316ba4aff1819629 ]
When the call to UV_REGISTER_MEM_SLOT is failing, for instance because there is not enough free secured memory, the Hypervisor (HV) has to call UV_RETURN to report the error to the Ultravisor (UV). Then the UV will call H_SVM_INIT_ABORT to abort the securing phase and go back to the calling VM.
If the kvm->arch.secure_guest is not set, in the return path rfid is called but there is no valid context to get back to the SVM since the Hcall has been routed by the Ultravisor.
Move the setting of kvm->arch.secure_guest earlier in kvmppc_h_svm_init_start() so in the return path, UV_RETURN will be called instead of rfid.
Cc: Bharata B Rao bharata@linux.ibm.com Cc: Benjamin Herrenschmidt benh@kernel.crashing.org Cc: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Laurent Dufour ldufour@linux.ibm.com Reviewed-by: Ram Pai linuxram@us.ibm.com Tested-by: Fabiano Rosas farosas@linux.ibm.com Signed-off-by: Paul Mackerras paulus@ozlabs.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kvm/book3s_hv_uvmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c index 5914fbfa5e0a7..8accba2d39bc4 100644 --- a/arch/powerpc/kvm/book3s_hv_uvmem.c +++ b/arch/powerpc/kvm/book3s_hv_uvmem.c @@ -209,6 +209,8 @@ unsigned long kvmppc_h_svm_init_start(struct kvm *kvm) int ret = H_SUCCESS; int srcu_idx;
+ kvm->arch.secure_guest = KVMPPC_SECURE_INIT_START; + if (!kvmppc_uvmem_bitmap) return H_UNSUPPORTED;
@@ -233,7 +235,6 @@ unsigned long kvmppc_h_svm_init_start(struct kvm *kvm) goto out; } } - kvm->arch.secure_guest |= KVMPPC_SECURE_INIT_START; out: srcu_read_unlock(&kvm->srcu, srcu_idx); return ret;