1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
Generic vm interface
====================================
The virtual machine "device" also accepts the ioctls KVM_SET_DEVICE_ATTR,
KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same
struct kvm_device_attr as other devices, but targets VM-wide settings
and controls.
The groups and attributes per virtual machine, if any, are architecture
specific.
1. GROUP: KVM_S390_VM_MEM_CTRL
Architectures: s390
1.1. ATTRIBUTE: KVM_S390_VM_MEM_ENABLE_CMMA
Parameters: none
Returns: -EBUSY if a vcpu is already defined, otherwise 0
Enables Collaborative Memory Management Assist (CMMA) for the virtual machine.
1.2. ATTRIBUTE: KVM_S390_VM_MEM_CLR_CMMA
Parameters: none
Returns: 0
Clear the CMMA status for all guest pages, so any pages the guest marked
as unused are again used any may not be reclaimed by the host.
1.3. ATTRIBUTE KVM_S390_VM_MEM_LIMIT_SIZE
Parameters: in attr->addr the address for the new limit of guest memory
Returns: -EFAULT if the given address is not accessible
-EINVAL if the virtual machine is of type UCONTROL
-E2BIG if the given guest memory is to big for that machine
-EBUSY if a vcpu is already defined
-ENOMEM if not enough memory is available for a new shadow guest mapping
0 otherwise
Allows userspace to query the actual limit and set a new limit for
the maximum guest memory size. The limit will be rounded up to
2048 MB, 4096 GB, 8192 TB respectively, as this limit is governed by
the number of page table levels. In the case that there is no limit we will set
the limit to KVM_S390_NO_MEM_LIMIT (U64_MAX).
2. GROUP: KVM_S390_VM_CPU_MODEL
Architectures: s390
2.1. ATTRIBUTE: KVM_S390_VM_CPU_MACHINE (r/o)
Allows user space to retrieve machine and kvm specific cpu related information:
struct kvm_s390_vm_cpu_machine {
__u64 cpuid; # CPUID of host
__u32 ibc; # IBC level range offered by host
__u8 pad[4];
__u64 fac_mask[256]; # set of cpu facilities enabled by KVM
__u64 fac_list[256]; # set of cpu facilities offered by host
}
Parameters: address of buffer to store the machine related cpu data
of type struct kvm_s390_vm_cpu_machine*
Returns: -EFAULT if the given address is not accessible from kernel space
-ENOMEM if not enough memory is available to process the ioctl
0 in case of success
2.2. ATTRIBUTE: KVM_S390_VM_CPU_PROCESSOR (r/w)
Allows user space to retrieve or request to change cpu related information for a vcpu:
struct kvm_s390_vm_cpu_processor {
__u64 cpuid; # CPUID currently (to be) used by this vcpu
__u16 ibc; # IBC level currently (to be) used by this vcpu
__u8 pad[6];
__u64 fac_list[256]; # set of cpu facilities currently (to be) used
# by this vcpu
}
KVM does not enforce or limit the cpu model data in any form. Take the information
retrieved by means of KVM_S390_VM_CPU_MACHINE as hint for reasonable configuration
setups. Instruction interceptions triggered by additionally set facility bits that
are not handled by KVM need to by imlemented in the VM driver code.
Parameters: address of buffer to store/set the processor related cpu
data of type struct kvm_s390_vm_cpu_processor*.
Returns: -EBUSY in case 1 or more vcpus are already activated (only in write case)
-EFAULT if the given address is not accessible from kernel space
-ENOMEM if not enough memory is available to process the ioctl
0 in case of success
2.3. ATTRIBUTE: KVM_S390_VM_CPU_MACHINE_FEAT (r/o)
Allows user space to retrieve available cpu features. A feature is available if
provided by the hardware and supported by kvm. In theory, cpu features could
even be completely emulated by kvm.
struct kvm_s390_vm_cpu_feat {
__u64 feat[16]; # Bitmap (1 = feature available), MSB 0 bit numbering
};
Parameters: address of a buffer to load the feature list from.
Returns: -EFAULT if the given address is not accessible from kernel space.
0 in case of success.
2.4. ATTRIBUTE: KVM_S390_VM_CPU_PROCESSOR_FEAT (r/w)
Allows user space to retrieve or change enabled cpu features for all VCPUs of a
VM. Features that are not available cannot be enabled.
See 2.3. for a description of the parameter struct.
Parameters: address of a buffer to store/load the feature list from.
Returns: -EFAULT if the given address is not accessible from kernel space.
-EINVAL if a cpu feature that is not available is to be enabled.
-EBUSY if at least one VCPU has already been defined.
0 in case of success.
3. GROUP: KVM_S390_VM_TOD
Architectures: s390
3.1. ATTRIBUTE: KVM_S390_VM_TOD_HIGH
Allows user space to set/get the TOD clock extension (u8).
Parameters: address of a buffer in user space to store the data (u8) to
Returns: -EFAULT if the given address is not accessible from kernel space
-EINVAL if setting the TOD clock extension to != 0 is not supported
3.2. ATTRIBUTE: KVM_S390_VM_TOD_LOW
Allows user space to set/get bits 0-63 of the TOD clock register as defined in
the POP (u64).
Parameters: address of a buffer in user space to store the data (u64) to
Returns: -EFAULT if the given address is not accessible from kernel space
4. GROUP: KVM_S390_VM_CRYPTO
Architectures: s390
4.1. ATTRIBUTE: KVM_S390_VM_CRYPTO_ENABLE_AES_KW (w/o)
Allows user space to enable aes key wrapping, including generating a new
wrapping key.
Parameters: none
Returns: 0
4.2. ATTRIBUTE: KVM_S390_VM_CRYPTO_ENABLE_DEA_KW (w/o)
Allows user space to enable dea key wrapping, including generating a new
wrapping key.
Parameters: none
Returns: 0
4.3. ATTRIBUTE: KVM_S390_VM_CRYPTO_DISABLE_AES_KW (w/o)
Allows user space to disable aes key wrapping, clearing the wrapping key.
Parameters: none
Returns: 0
4.4. ATTRIBUTE: KVM_S390_VM_CRYPTO_DISABLE_DEA_KW (w/o)
Allows user space to disable dea key wrapping, clearing the wrapping key.
Parameters: none
Returns: 0
|
