On 30/06/15 17:13, Will Deacon wrote:
> On Fri, Jun 26, 2015 at 02:16:18PM +0100, Andre Przywara wrote:
>> Currently we unconditionally create a virtual GICv2 in the guest.
>> Add a --irqchip= parameter to let the user specify a different GIC
>> type for the guest, when omitting this parameter it still defaults to
>> --irqchip=gicv2.
>> For now the only other supported type is --irqchip=gicv3
>>
>> Signed-off-by: Andre Przywara <[email protected]>
>> ---
>> arm/aarch64/arm-cpu.c | 2 +-
>> arm/gic.c | 17 +++++++++++++++++
>> arm/include/arm-common/kvm-config-arch.h | 9 ++++++++-
>> arm/kvm.c | 2 +-
>> 4 files changed, 27 insertions(+), 3 deletions(-)
>>
>> diff --git a/arm/aarch64/arm-cpu.c b/arm/aarch64/arm-cpu.c
>> index f702b9e..3dc8ea3 100644
>> --- a/arm/aarch64/arm-cpu.c
>> +++ b/arm/aarch64/arm-cpu.c
>> @@ -12,7 +12,7 @@
>> static void generate_fdt_nodes(void *fdt, struct kvm *kvm, u32 gic_phandle)
>> {
>> int timer_interrupts[4] = {13, 14, 11, 10};
>> - gic__generate_fdt_nodes(fdt, gic_phandle, IRQCHIP_GICV2);
>> + gic__generate_fdt_nodes(fdt, gic_phandle, kvm->cfg.arch.irqchip);
>> timer__generate_fdt_nodes(fdt, kvm, timer_interrupts);
>> }
>>
>> diff --git a/arm/gic.c b/arm/gic.c
>> index efe4b42..ff56de7 100644
>> --- a/arm/gic.c
>> +++ b/arm/gic.c
>> @@ -22,6 +22,23 @@ static int gic_fd = -1;
>> static u64 gic_redists_base;
>> static u64 gic_redists_size;
>>
>> +int irqchip_parser(const struct option *opt, const char *arg, int unset)
>> +{
>> + enum irqchip_type *type = opt->value;
>> +
>> + *type = IRQCHIP_GICV2;
>
> Pointless assignment?
Yeah, that's a leftover from some refactoring.
>
>> + if (!strcmp(arg, "gicv2")) {
>> + *type = IRQCHIP_GICV2;
>> + } else if (!strcmp(arg, "gicv3")) {
>> + *type = IRQCHIP_GICV3;
>> + } else {
>> + fprintf(stderr, "irqchip: unknown type \"%s\"\n", arg);
>> + return -1;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> static int gic__create_device(struct kvm *kvm, enum irqchip_type type)
>> {
>> int err;
>> diff --git a/arm/include/arm-common/kvm-config-arch.h
>> b/arm/include/arm-common/kvm-config-arch.h
>> index a8ebd94..9529881 100644
>> --- a/arm/include/arm-common/kvm-config-arch.h
>> +++ b/arm/include/arm-common/kvm-config-arch.h
>> @@ -8,8 +8,11 @@ struct kvm_config_arch {
>> unsigned int force_cntfrq;
>> bool virtio_trans_pci;
>> bool aarch32_guest;
>> + enum irqchip_type irqchip;
>> };
>>
>> +int irqchip_parser(const struct option *opt, const char *arg, int unset);
>> +
>> #define OPT_ARCH_RUN(pfx, cfg)
>> \
>> pfx,
>> \
>> ARM_OPT_ARCH_RUN(cfg)
>> \
>> @@ -21,6 +24,10 @@ struct kvm_config_arch {
>> "updated to program CNTFRQ correctly*"),
>> \
>> OPT_BOOLEAN('\0', "force-pci", &(cfg)->virtio_trans_pci,
>> \
>> "Force virtio devices to use PCI as their default "
>> \
>> - "transport"),
>> + "transport"),
>> \
>> + OPT_CALLBACK('\0', "irqchip", &(cfg)->irqchip,
>> \
>> + "[gicv2|gicv3]", \
>> + "type of interrupt controller to emulate in the guest",
>> \
>> + irqchip_parser, NULL),
>
> What happens if I don't pass this option at all?
Then &(cfg)->irqchip will be 0 as all the other configuration parameters
because they are part of struct kvm, which is calloc()ed.
So it will be IRQCHIP_GICV2, as that is the first entry in the enum.
Admittedly a bit convoluted, do you want a comment or an explicit
enum { IRQCHIP_GICV2 = 0, ...}?
Cheers,
Andre.
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