On Mon, Oct 08, 2018 at 01:41:36PM +0100, Peter Maydell wrote:
> On 3 October 2018 at 16:07, Edgar E. Iglesias <edgar.igles...@gmail.com>
> wrote:
> > From: "Edgar E. Iglesias" <edgar.igles...@xilinx.com>
> >
> > When QEMU provides the equivalent of the EL3 firmware, we
> > need to enable HVCs in scr_el3 when turning on CPUs that
> > target EL2.
> >
> > Signed-off-by: Edgar E. Iglesias <edgar.igles...@xilinx.com>
> > ---
> > target/arm/arm-powerctl.c | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/target/arm/arm-powerctl.c b/target/arm/arm-powerctl.c
> > index ce55eeb..54f2974 100644
> > --- a/target/arm/arm-powerctl.c
> > +++ b/target/arm/arm-powerctl.c
> > @@ -63,6 +63,7 @@ static void arm_set_cpu_on_async_work(CPUState
> > *target_cpu_state,
> > struct CpuOnInfo *info = (struct CpuOnInfo *) data.host_ptr;
> >
> > /* Initialize the cpu we are turning on */
> > + qemu_log("CPU%d reset\n", target_cpu_state->cpu_index);
>
> qemu_log logging should always be masked to a particular
> log kind (either via qemu_log_mask() or by explicit check on
> the log level). If this was accidentally left-in debug, you could
> just drop it :-)
Hah, yes this is an accidental leftover...
>
> > cpu_reset(target_cpu_state);
> > target_cpu_state->halted = 0;
> >
> > @@ -103,6 +104,16 @@ static void arm_set_cpu_on_async_work(CPUState
> > *target_cpu_state,
> > } else {
> > /* Processor is not in secure mode */
> > target_cpu->env.cp15.scr_el3 |= SCR_NS;
> > +
> > + /*
> > + * If QEMU is providing the equivalent of EL3 firmware, then we
> > need
> > + * to make sure a CPU targeting EL2 comes out of reset with a
> > + * functional HVC insn.
> > + */
> > + if (arm_feature(&target_cpu->env, ARM_FEATURE_EL3)
> > + && info->target_el == 2) {
> > + target_cpu->env.cp15.scr_el3 |= SCR_HCE;
> > + }
> > }
>
> Otherwise
> Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
> This is definitely required for PSCI and I think it makes sense
> in other cases that end up in this powerctl code with EL3 set.
Thanks,
Edgar
