KVM: PPC: 44x: fix DCR read/write

When remembering the direction of a DCR transaction, we should write
to the same variable that we interpret on later when doing vcpu_run
again.

Signed-off-by: Alexander Graf <agraf@suse.de>
Cc: stable@vger.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/44x_emulate.c b/arch/powerpc/kvm/44x_emulate.c
index 1a793c4c4a6..35ec0a8547d 100644
--- a/arch/powerpc/kvm/44x_emulate.c
+++ b/arch/powerpc/kvm/44x_emulate.c
@@ -46,6 +46,7 @@ static int emulate_mtdcr(struct kvm_vcpu *vcpu, int rs, int dcrn)
                 vcpu->run->dcr.dcrn = dcrn;
                 vcpu->run->dcr.data = kvmppc_get_gpr(vcpu, rs);
                 vcpu->run->dcr.is_write = 1;
+                vcpu->arch.dcr_is_write = 1;
                 vcpu->arch.dcr_needed = 1;
                 kvmppc_account_exit(vcpu, DCR_EXITS);
                 return EMULATE_DO_DCR;
@@ -80,6 +81,7 @@ static int emulate_mfdcr(struct kvm_vcpu *vcpu, int rt, int dcrn)
                 vcpu->run->dcr.dcrn = dcrn;
                 vcpu->run->dcr.data =  0;
                 vcpu->run->dcr.is_write = 0;
+                vcpu->arch.dcr_is_write = 0;
                 vcpu->arch.io_gpr = rt;
                 vcpu->arch.dcr_needed = 1;
                 kvmppc_account_exit(vcpu, DCR_EXITS);