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| author | Alexander Graf <agraf@suse.de> | 2010-03-24 21:48:29 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2010-05-17 11:17:09 +0200 |
| commit | 71fbfd5f38f73515f1516a68fbe04dba198b70f0 (patch) | |
| tree | 653626126cef565890652f83f4eba7f376642709 /Documentation | |
| parent | KVM: PPC: Implement alignment interrupt (diff) | |
| download | linux-71fbfd5f38f73515f1516a68fbe04dba198b70f0.tar.xz linux-71fbfd5f38f73515f1516a68fbe04dba198b70f0.zip | |
KVM: Add support for enabling capabilities per-vcpu
Some times we don't want all capabilities to be available to all
our vcpus. One example for that is the OSI interface, implemented
in the next patch.
In order to have a generic mechanism in how to enable capabilities
individually, this patch introduces a new ioctl that can be used
for this purpose. That way features we don't want in all guests or
userspace configurations can just not be enabled and we're good.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kvm/api.txt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt index 2cc0120ccdb5..f9724dc8d079 100644 --- a/Documentation/kvm/api.txt +++ b/Documentation/kvm/api.txt @@ -813,6 +813,41 @@ This ioctl is required on Intel-based hosts. This is needed on Intel hardware because of a quirk in the virtualization implementation (see the internals documentation when it pops into existence). +4.36 KVM_ENABLE_CAP + +Capability: KVM_CAP_ENABLE_CAP +Architectures: ppc +Type: vcpu ioctl +Parameters: struct kvm_enable_cap (in) +Returns: 0 on success; -1 on error + ++Not all extensions are enabled by default. Using this ioctl the application +can enable an extension, making it available to the guest. + +On systems that do not support this ioctl, it always fails. On systems that +do support it, it only works for extensions that are supported for enablement. + +To check if a capability can be enabled, the KVM_CHECK_EXTENSION ioctl should +be used. + +struct kvm_enable_cap { + /* in */ + __u32 cap; + +The capability that is supposed to get enabled. + + __u32 flags; + +A bitfield indicating future enhancements. Has to be 0 for now. + + __u64 args[4]; + +Arguments for enabling a feature. If a feature needs initial values to +function properly, this is the place to put them. + + __u8 pad[64]; +}; + 5. The kvm_run structure Application code obtains a pointer to the kvm_run structure by |