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| author | Pekka Enberg <penberg@kernel.org> | 2011-05-09 21:48:54 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-05-22 14:48:11 +0200 |
| commit | 76d25402dfc972a135a656613736fe3602045a95 (patch) | |
| tree | 2574a84c4437fd618011cc60f6227140cf4403fc /Documentation/kvm/api.txt | |
| parent | KVM: make guest mode entry to be rcu quiescent state (diff) | |
| download | linux-76d25402dfc972a135a656613736fe3602045a95.tar.xz linux-76d25402dfc972a135a656613736fe3602045a95.zip | |
KVM: Add documentation for KVM_CAP_NR_VCPUS
Document KVM_CAP_NR_VCPUS that can be used by the userspace to determine
maximum number of VCPUs it can create with the KVM_CREATE_VCPU ioctl.
Cc: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | Documentation/kvm/api.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt index f64c41f8ba61..42542eb802ca 100644 --- a/Documentation/kvm/api.txt +++ b/Documentation/kvm/api.txt @@ -175,7 +175,10 @@ 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). +in the range [0, max_vcpus). You can use KVM_CAP_NR_VCPUS of the +KVM_CHECK_EXTENSION ioctl() to determine the value for max_vcpus at run-time. +If the KVM_CAP_NR_VCPUS does not exist, you should assume that max_vcpus is 4 +cpus max. 4.8 KVM_GET_DIRTY_LOG (vm ioctl) |