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KVM: PPC: Add KVM_CAP_NR_VCPUS and KVM_CAP_MAX_VCPUS

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PPC KVM lacks these two capabilities, and as such a userland system must assume
a max of 4 VCPUs (following api.txt).  With these, a userland can determine
a more realistic limit.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Matt Evans 2011-12-07 16:55:57 +00:00 committed by Avi Kivity
parent 03cdab5340
commit b5434032fc
1 changed files with 16 additions and 0 deletions
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16
arch/powerpc/kvm/powerpc.c
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@ -249,6 +249,22 @@ int kvm_dev_ioctl_check_extension(long ext)
r = cpu_has_feature(CPU_FTR_ARCH_206) ? 1 : 0;
break;
#endif
case KVM_CAP_NR_VCPUS:
/*
* Recommending a number of CPUs is somewhat arbitrary; we
* return the number of present CPUs for -HV (since a host
* will have secondary threads "offline"), and for other KVM
* implementations just count online CPUs.
*/
#ifdef CONFIG_KVM_BOOK3S_64_HV
r = num_present_cpus();
#else
r = num_online_cpus();
#endif
break;
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
default:
r = 0;
break;