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KVM: document target of capability enablement

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Capabilities can be enabled on a vcpu or (since recently) on a vm. Document
this and note for the existing capabilites whether they are per-vcpu or
per-vm.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Cornelia Huck 2014-06-27 09:29:26 +02:00 committed by Christian Borntraeger
parent ea74c0ea1b
commit 0907c855b3
1 changed files with 15 additions and 3 deletions
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18
Documentation/virtual/kvm/api.txt
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@ -2875,15 +2875,18 @@ The fields in each entry are defined as follows:
6. Capabilities that can be enabled
-----------------------------------
There are certain capabilities that change the behavior of the virtual CPU when
enabled. To enable them, please see section 4.37. Below you can find a list of
capabilities and what their effect on the vCPU is when enabling them.
There are certain capabilities that change the behavior of the virtual CPU or
the virtual machine when enabled. To enable them, please see section 4.37.
Below you can find a list of capabilities and what their effect on the vCPU or
the virtual machine is when enabling them.
The following information is provided along with the description:
Architectures: which instruction set architectures provide this ioctl.
x86 includes both i386 and x86_64.
Target: whether this is a per-vcpu or per-vm capability.
Parameters: what parameters are accepted by the capability.
Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL)
@ -2893,6 +2896,7 @@ The following information is provided along with the description:
6.1 KVM_CAP_PPC_OSI
Architectures: ppc
Target: vcpu
Parameters: none
Returns: 0 on success; -1 on error
@ -2907,6 +2911,7 @@ When this capability is enabled, KVM_EXIT_OSI can occur.
6.2 KVM_CAP_PPC_PAPR
Architectures: ppc
Target: vcpu
Parameters: none
Returns: 0 on success; -1 on error
@ -2926,6 +2931,7 @@ When this capability is enabled, KVM_EXIT_PAPR_HCALL can occur.
6.3 KVM_CAP_SW_TLB
Architectures: ppc
Target: vcpu
Parameters: args[0] is the address of a struct kvm_config_tlb
Returns: 0 on success; -1 on error
@ -2968,6 +2974,7 @@ For mmu types KVM_MMU_FSL_BOOKE_NOHV and KVM_MMU_FSL_BOOKE_HV:
6.4 KVM_CAP_S390_CSS_SUPPORT
Architectures: s390
Target: vcpu
Parameters: none
Returns: 0 on success; -1 on error
@ -2979,9 +2986,13 @@ handled in-kernel, while the other I/O instructions are passed to userspace.
When this capability is enabled, KVM_EXIT_S390_TSCH will occur on TEST
SUBCHANNEL intercepts.
Note that even though this capability is enabled per-vcpu, the complete
virtual machine is affected.
6.5 KVM_CAP_PPC_EPR
Architectures: ppc
Target: vcpu
Parameters: args[0] defines whether the proxy facility is active
Returns: 0 on success; -1 on error
@ -3007,6 +3018,7 @@ This capability connects the vcpu to an in-kernel MPIC device.
6.7 KVM_CAP_IRQ_XICS
Architectures: ppc
Target: vcpu
Parameters: args[0] is the XICS device fd
args[1] is the XICS CPU number (server ID) for this vcpu