kvm: arm64: handle single-step of userspace mmio instructions

The system state of KVM when using userspace emulation is not complete
until we return into KVM_RUN. To handle mmio related updates we wait
until they have been committed and then schedule our KVM_EXIT_DEBUG.

The kvm_arm_handle_step_debug() helper tells us if we need to return
and sets up the exit_reason for us.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index a6524ff..322c570 100644 (file)
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -628,6 +628,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
                ret = kvm_handle_mmio_return(vcpu, vcpu->run);
                if (ret)
                        return ret;
+               if (kvm_arm_handle_step_debug(vcpu, vcpu->run))
+                       return 0;
+
        }
 
        if (run->immediate_exit)