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KVM: PPC: Book3S HV: Add capability to report possible virtual SMT modes

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Now that userspace can set the virtual SMT mode by enabling the
KVM_CAP_PPC_SMT capability, it is useful for userspace to be able
to query the set of possible virtual SMT modes.  This provides a
new capability, KVM_CAP_PPC_SMT_POSSIBLE, to provide this
information.  The return value is a bitmap of possible modes, with
bit N set if virtual SMT mode 2^N is available.  That is, 1 indicates
SMT1 is available, 2 indicates that SMT2 is available, 3 indicates
that both SMT1 and SMT2 are available, and so on.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras 2017-06-21 16:01:27 +10:00
parent e20bbd3d8d
commit 2ed4f9dd19
3 changed files with 22 additions and 0 deletions
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1
include/uapi/linux/kvm.h
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@ -896,6 +896,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_X86_GUEST_MWAIT 143
#define KVM_CAP_ARM_USER_IRQ 144
#define KVM_CAP_PPC_FWNMI 145
#define KVM_CAP_PPC_SMT_POSSIBLE 146
#ifdef KVM_CAP_IRQ_ROUTING