On 09/10/18 12:23, Julien Grall wrote:
> On 05/10/2018 15:54, Andrew Cooper wrote:
>> ---
>> xen/arch/arm/domain.c | 18 ++++++++++++++++++
>> xen/arch/x86/domain.c | 6 ++++++
>> xen/common/domain.c | 3 +++
>> 3 files changed, 27 insertions(+)
>>
>> diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
>> index 43593a4..9676893 100644
>> --- a/xen/arch/arm/domain.c
>> +++ b/xen/arch/arm/domain.c
>> @@ -601,6 +601,8 @@ void vcpu_switch_to_aarch64_mode(struct vcpu *v)
>> int arch_check_domain_config(struct xen_domctl_createdomain *config)
>> {
>> + unsigned int max_vcpus = 0;
>> +
>> /* Fill in the native GIC version, passed back to the
>> toolstack. */
>> if ( config->arch.gic_version == XEN_DOMCTL_CONFIG_GIC_NATIVE )
>> {
>> @@ -619,6 +621,22 @@ int arch_check_domain_config(struct
>> xen_domctl_createdomain *config)
>> }
>> }
>> + /* Calculate the maximum number of vcpus from the selected GIC
>> version... */
>> + switch ( config->arch.gic_version )
>> + {
>> + case GIC_V2: max_vcpus = 8; break;
>> + case GIC_V3: max_vcpus = 255; break;
>> +
>> + default:
>> + return -EOPNOTSUPP;
>> + }
>
> I would prefer to keep those values in a separate helper implemented
> by each vGIC.
How do you intend that working? The values can't be hooked off a GIC
object, because we don't have one yet.
>
>> +
>> + /* ... clipped at the maximum value Xen has been configured for. */
>> + max_vcpus = min(max_vcpus, MAX_VIRT_CPUS + 0u);
>
> + 0U feels a bit odd to read. It would be better to append u in
> MAX_VIRT_CPUS.
Will do.
~Andrew
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