On 2016/4/25 1:28, Andrew Jones wrote:
> On Sat, Apr 23, 2016 at 06:04:14PM +0800, Shannon Zhao wrote:
>> > From: Shannon Zhao <shannon.z...@linaro.org>
>> >
>> > Add a virtual PMU device for virt machine while use PPI 7 for PMU
>> > overflow interrupt number.
>> >
>> > Signed-off-by: Shannon Zhao <shannon.z...@linaro.org>
>> > ---
>> > hw/arm/virt.c | 31 +++++++++++++++++++++++++++++++
>> > include/hw/arm/virt.h | 4 ++++
>> > include/sysemu/kvm.h | 1 +
>> > stubs/kvm.c | 5 +++++
>> > target-arm/kvm64.c | 39 +++++++++++++++++++++++++++++++++++++++
>> > 5 files changed, 80 insertions(+)
>> >
>> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c
>> > index 56d35c7..d77b314 100644
>> > --- a/hw/arm/virt.c
>> > +++ b/hw/arm/virt.c
>> > @@ -428,6 +428,35 @@ static void fdt_add_gic_node(VirtBoardInfo *vbi, int
>> > type)
>> > qemu_fdt_setprop_cell(vbi->fdt, "/intc", "phandle", vbi->gic_phandle);
>> > }
>> >
>> > +static void fdt_add_pmu_nodes(const VirtBoardInfo *vbi)
>> > +{
>> > + CPUState *cpu;
>> > + ARMCPU *armcpu;
>> > + uint32_t irqflags = GIC_FDT_IRQ_FLAGS_LEVEL_HI;
>> > +
>> > + CPU_FOREACH(cpu) {
>> > + armcpu = ARM_CPU(cpu);
>> > + if (!armcpu->has_pmu) {
>> > + return;
>> > + }
>> > +
>> > + kvm_arm_pmu_create(cpu, PPI(VIRTUAL_PMU_IRQ));
>> > + }
>> > +
>> > + irqflags = deposit32(irqflags, GIC_FDT_IRQ_PPI_CPU_START,
>> > + GIC_FDT_IRQ_PPI_CPU_WIDTH, (1 << vbi->smp_cpus)
>> > - 1);
> The shift will overflow when configuring a machine to have more than
> 32 cpus. You should confirm smp_cpus is <= GIC_FDT_IRQ_PPI_CPU_WIDTH
> before generating a mask this way, otherwise you can just pass in 0xff.
>
Ah, right. So it could check the gictype like what we do in
fdt_add_timer_nodes.
Thanks,
--
Shannon
