* KVM_CREATE_VCPU max vcpu ABI
@ 2011-05-07 10:16 Pekka Enberg
2011-05-07 11:12 ` Jan Kiszka
0 siblings, 1 reply; 3+ messages in thread
From: Pekka Enberg @ 2011-05-07 10:16 UTC (permalink / raw)
To: Avi Kivity, KVM General, Ingo Molnar, Asias He, Cyrill Gorcunov,
Sasha Levin <levin
Hi!
Documentation/kvm/api.txt says the following:
4.6 KVM_CREATE_VCPU
Capability: basic
Architectures: all
Type: vm ioctl
Parameters: vcpu id (apic id on x86)
Returns: vcpu fd on success, -1 on error
This API adds a vcpu to a virtual machine. The vcpu id is a small integer
in the range [0, max_vcpus).
However, max_vcpus is not specified and I am unable to find ioctl()
which I could use to look it up. Is it specified somewhere? We can, of
course, attempt to create as many VCPUs as possible until
KVM_CREATE_VCPU returns EINVAL...
Pekka
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: KVM_CREATE_VCPU max vcpu ABI
2011-05-07 10:16 KVM_CREATE_VCPU max vcpu ABI Pekka Enberg
@ 2011-05-07 11:12 ` Jan Kiszka
2011-05-07 14:48 ` Pekka Enberg
0 siblings, 1 reply; 3+ messages in thread
From: Jan Kiszka @ 2011-05-07 11:12 UTC (permalink / raw)
To: Pekka Enberg
Cc: Avi Kivity, KVM General, Ingo Molnar, Asias He, Cyrill Gorcunov,
Sasha Levin
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On 2011-05-07 12:16, Pekka Enberg wrote:
> Hi!
>
> Documentation/kvm/api.txt says the following:
>
> 4.6 KVM_CREATE_VCPU
>
> Capability: basic
> Architectures: all
> Type: vm ioctl
> Parameters: vcpu id (apic id on x86)
> Returns: vcpu fd on success, -1 on error
>
> This API adds a vcpu to a virtual machine. The vcpu id is a small integer
> in the range [0, max_vcpus).
>
> However, max_vcpus is not specified and I am unable to find ioctl()
> which I could use to look it up. Is it specified somewhere? We can, of
> course, attempt to create as many VCPUs as possible until
> KVM_CREATE_VCPU returns EINVAL...
Querying for KVM_CAP_NR_VCPUS returns this number (documented in the kvm
header). Want to file a patch for adding a hint to the section above?
Jan
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KVM_CREATE_VCPU max vcpu ABI
2011-05-07 11:12 ` Jan Kiszka
@ 2011-05-07 14:48 ` Pekka Enberg
0 siblings, 0 replies; 3+ messages in thread
From: Pekka Enberg @ 2011-05-07 14:48 UTC (permalink / raw)
To: Jan Kiszka
Cc: Avi Kivity, KVM General, Ingo Molnar, Asias He, Cyrill Gorcunov,
Sasha Levin
On Sat, 2011-05-07 at 13:12 +0200, Jan Kiszka wrote:
> On 2011-05-07 12:16, Pekka Enberg wrote:
> > Hi!
> >
> > Documentation/kvm/api.txt says the following:
> >
> > 4.6 KVM_CREATE_VCPU
> >
> > Capability: basic
> > Architectures: all
> > Type: vm ioctl
> > Parameters: vcpu id (apic id on x86)
> > Returns: vcpu fd on success, -1 on error
> >
> > This API adds a vcpu to a virtual machine. The vcpu id is a small integer
> > in the range [0, max_vcpus).
> >
> > However, max_vcpus is not specified and I am unable to find ioctl()
> > which I could use to look it up. Is it specified somewhere? We can, of
> > course, attempt to create as many VCPUs as possible until
> > KVM_CREATE_VCPU returns EINVAL...
>
> Querying for KVM_CAP_NR_VCPUS returns this number (documented in the kvm
> header). Want to file a patch for adding a hint to the section above?
Done. Thanks Jan!
^ permalink raw reply [flat|nested] 3+ messages in thread
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