KVM: Improve readability of KVM API doc
This helps to identify sections and it also fixes the numbering from
4.54 to 4.61.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index a155221..b48f927 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2,6 +2,7 @@
===================================================================
1. General description
+----------------------
The kvm API is a set of ioctls that are issued to control various aspects
of a virtual machine. The ioctls belong to three classes
@@ -23,7 +24,9 @@
Only run vcpu ioctls from the same thread that was used to create the
vcpu.
+
2. File descriptors
+-------------------
The kvm API is centered around file descriptors. An initial
open("/dev/kvm") obtains a handle to the kvm subsystem; this handle
@@ -41,7 +44,9 @@
the API. The only supported use is one virtual machine per process,
and one vcpu per thread.
+
3. Extensions
+-------------
As of Linux 2.6.22, the KVM ABI has been stabilized: no backward
incompatible change are allowed. However, there is an extension
@@ -53,7 +58,9 @@
whether a particular extension identifier is available. If it is, a
set of ioctls is available for application use.
+
4. API description
+------------------
This section describes ioctls that can be used to control kvm guests.
For each ioctl, the following information is provided along with a
@@ -75,6 +82,7 @@
Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL)
are not detailed, but errors with specific meanings are.
+
4.1 KVM_GET_API_VERSION
Capability: basic
@@ -90,6 +98,7 @@
returns a value other than 12. If this check passes, all ioctls
described as 'basic' will be available.
+
4.2 KVM_CREATE_VM
Capability: basic
@@ -109,6 +118,7 @@
KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL as
privileged user (CAP_SYS_ADMIN).
+
4.3 KVM_GET_MSR_INDEX_LIST
Capability: basic
@@ -135,6 +145,7 @@
not returned in the MSR list, as different vcpus can have a different number
of banks, as set via the KVM_X86_SETUP_MCE ioctl.
+
4.4 KVM_CHECK_EXTENSION
Capability: basic
@@ -149,6 +160,7 @@
Generally 0 means no and 1 means yes, but some extensions may report
additional information in the integer return value.
+
4.5 KVM_GET_VCPU_MMAP_SIZE
Capability: basic
@@ -161,6 +173,7 @@
memory region. This ioctl returns the size of that region. See the
KVM_RUN documentation for details.
+
4.6 KVM_SET_MEMORY_REGION
Capability: basic
@@ -171,6 +184,7 @@
This ioctl is obsolete and has been removed.
+
4.7 KVM_CREATE_VCPU
Capability: basic
@@ -223,6 +237,7 @@
KVM_S390_SIE_PAGE_OFFSET in order to obtain a memory map of the virtual
cpu's hardware control block.
+
4.8 KVM_GET_DIRTY_LOG (vm ioctl)
Capability: basic
@@ -246,6 +261,7 @@
memory slot. Ensure the entire structure is cleared to avoid padding
issues.
+
4.9 KVM_SET_MEMORY_ALIAS
Capability: basic
@@ -256,6 +272,7 @@
This ioctl is obsolete and has been removed.
+
4.10 KVM_RUN
Capability: basic
@@ -272,6 +289,7 @@
KVM_GET_VCPU_MMAP_SIZE. The parameter block is formatted as a 'struct
kvm_run' (see below).
+
4.11 KVM_GET_REGS
Capability: basic
@@ -292,6 +310,7 @@
__u64 rip, rflags;
};
+
4.12 KVM_SET_REGS
Capability: basic
@@ -304,6 +323,7 @@
See KVM_GET_REGS for the data structure.
+
4.13 KVM_GET_SREGS
Capability: basic
@@ -331,6 +351,7 @@
one bit may be set. This interrupt has been acknowledged by the APIC
but not yet injected into the cpu core.
+
4.14 KVM_SET_SREGS
Capability: basic
@@ -342,6 +363,7 @@
Writes special registers into the vcpu. See KVM_GET_SREGS for the
data structures.
+
4.15 KVM_TRANSLATE
Capability: basic
@@ -365,6 +387,7 @@
__u8 pad[5];
};
+
4.16 KVM_INTERRUPT
Capability: basic
@@ -413,6 +436,7 @@
Note that any value for 'irq' other than the ones stated above is invalid
and incurs unexpected behavior.
+
4.17 KVM_DEBUG_GUEST
Capability: basic
@@ -423,6 +447,7 @@
Support for this has been removed. Use KVM_SET_GUEST_DEBUG instead.
+
4.18 KVM_GET_MSRS
Capability: basic
@@ -451,6 +476,7 @@
size of the entries array) and the 'index' member of each array entry.
kvm will fill in the 'data' member.
+
4.19 KVM_SET_MSRS
Capability: basic
@@ -466,6 +492,7 @@
size of the entries array), and the 'index' and 'data' members of each
array entry.
+
4.20 KVM_SET_CPUID
Capability: basic
@@ -494,6 +521,7 @@
struct kvm_cpuid_entry entries[0];
};
+
4.21 KVM_SET_SIGNAL_MASK
Capability: basic
@@ -516,6 +544,7 @@
__u8 sigset[0];
};
+
4.22 KVM_GET_FPU
Capability: basic
@@ -541,6 +570,7 @@
__u32 pad2;
};
+
4.23 KVM_SET_FPU
Capability: basic
@@ -566,6 +596,7 @@
__u32 pad2;
};
+
4.24 KVM_CREATE_IRQCHIP
Capability: KVM_CAP_IRQCHIP
@@ -579,6 +610,7 @@
local APIC. IRQ routing for GSIs 0-15 is set to both PIC and IOAPIC; GSI 16-23
only go to the IOAPIC. On ia64, a IOSAPIC is created.
+
4.25 KVM_IRQ_LINE
Capability: KVM_CAP_IRQCHIP
@@ -600,6 +632,7 @@
__u32 level; /* 0 or 1 */
};
+
4.26 KVM_GET_IRQCHIP
Capability: KVM_CAP_IRQCHIP
@@ -621,6 +654,7 @@
} chip;
};
+
4.27 KVM_SET_IRQCHIP
Capability: KVM_CAP_IRQCHIP
@@ -642,6 +676,7 @@
} chip;
};
+
4.28 KVM_XEN_HVM_CONFIG
Capability: KVM_CAP_XEN_HVM
@@ -666,6 +701,7 @@
__u8 pad2[30];
};
+
4.29 KVM_GET_CLOCK
Capability: KVM_CAP_ADJUST_CLOCK
@@ -684,6 +720,7 @@
__u32 pad[9];
};
+
4.30 KVM_SET_CLOCK
Capability: KVM_CAP_ADJUST_CLOCK
@@ -702,6 +739,7 @@
__u32 pad[9];
};
+
4.31 KVM_GET_VCPU_EVENTS
Capability: KVM_CAP_VCPU_EVENTS
@@ -741,6 +779,7 @@
KVM_VCPUEVENT_VALID_SHADOW may be set in the flags field to signal that
interrupt.shadow contains a valid state. Otherwise, this field is undefined.
+
4.32 KVM_SET_VCPU_EVENTS
Capability: KVM_CAP_VCPU_EVENTS
@@ -767,6 +806,7 @@
the flags field to signal that interrupt.shadow contains a valid state and
shall be written into the VCPU.
+
4.33 KVM_GET_DEBUGREGS
Capability: KVM_CAP_DEBUGREGS
@@ -785,6 +825,7 @@
__u64 reserved[9];
};
+
4.34 KVM_SET_DEBUGREGS
Capability: KVM_CAP_DEBUGREGS
@@ -798,6 +839,7 @@
See KVM_GET_DEBUGREGS for the data structure. The flags field is unused
yet and must be cleared on entry.
+
4.35 KVM_SET_USER_MEMORY_REGION
Capability: KVM_CAP_USER_MEM
@@ -844,6 +886,7 @@
The KVM_SET_MEMORY_REGION does not allow fine grained control over memory
allocation and is deprecated.
+
4.36 KVM_SET_TSS_ADDR
Capability: KVM_CAP_SET_TSS_ADDR
@@ -862,6 +905,7 @@
because of a quirk in the virtualization implementation (see the internals
documentation when it pops into existence).
+
4.37 KVM_ENABLE_CAP
Capability: KVM_CAP_ENABLE_CAP
@@ -897,6 +941,7 @@
__u8 pad[64];
};
+
4.38 KVM_GET_MP_STATE
Capability: KVM_CAP_MP_STATE
@@ -927,6 +972,7 @@
This ioctl is only useful after KVM_CREATE_IRQCHIP. Without an in-kernel
irqchip, the multiprocessing state must be maintained by userspace.
+
4.39 KVM_SET_MP_STATE
Capability: KVM_CAP_MP_STATE
@@ -941,6 +987,7 @@
This ioctl is only useful after KVM_CREATE_IRQCHIP. Without an in-kernel
irqchip, the multiprocessing state must be maintained by userspace.
+
4.40 KVM_SET_IDENTITY_MAP_ADDR
Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR
@@ -959,6 +1006,7 @@
because of a quirk in the virtualization implementation (see the internals
documentation when it pops into existence).
+
4.41 KVM_SET_BOOT_CPU_ID
Capability: KVM_CAP_SET_BOOT_CPU_ID
@@ -971,6 +1019,7 @@
as the vcpu id in KVM_CREATE_VCPU. If this ioctl is not called, the default
is vcpu 0.
+
4.42 KVM_GET_XSAVE
Capability: KVM_CAP_XSAVE
@@ -985,6 +1034,7 @@
This ioctl would copy current vcpu's xsave struct to the userspace.
+
4.43 KVM_SET_XSAVE
Capability: KVM_CAP_XSAVE
@@ -999,6 +1049,7 @@
This ioctl would copy userspace's xsave struct to the kernel.
+
4.44 KVM_GET_XCRS
Capability: KVM_CAP_XCRS
@@ -1022,6 +1073,7 @@
This ioctl would copy current vcpu's xcrs to the userspace.
+
4.45 KVM_SET_XCRS
Capability: KVM_CAP_XCRS
@@ -1045,6 +1097,7 @@
This ioctl would set vcpu's xcr to the value userspace specified.
+
4.46 KVM_GET_SUPPORTED_CPUID
Capability: KVM_CAP_EXT_CPUID
@@ -1119,6 +1172,7 @@
if that returns true and you use KVM_CREATE_IRQCHIP, or if you emulate the
feature in userspace, then you can enable the feature for KVM_SET_CPUID2.
+
4.47 KVM_PPC_GET_PVINFO
Capability: KVM_CAP_PPC_GET_PVINFO
@@ -1142,6 +1196,7 @@
If any additional field gets added to this structure later on, a bit for that
additional piece of information will be set in the flags bitmap.
+
4.48 KVM_ASSIGN_PCI_DEVICE
Capability: KVM_CAP_DEVICE_ASSIGNMENT
@@ -1185,6 +1240,7 @@
device assignment. The user requesting this ioctl must have read/write
access to the PCI sysfs resource files associated with the device.
+
4.49 KVM_DEASSIGN_PCI_DEVICE
Capability: KVM_CAP_DEVICE_DEASSIGNMENT
@@ -1198,6 +1254,7 @@
See KVM_CAP_DEVICE_ASSIGNMENT for the data structure. Only assigned_dev_id is
used in kvm_assigned_pci_dev to identify the device.
+
4.50 KVM_ASSIGN_DEV_IRQ
Capability: KVM_CAP_ASSIGN_DEV_IRQ
@@ -1231,6 +1288,7 @@
It is not valid to specify multiple types per host or guest IRQ. However, the
IRQ type of host and guest can differ or can even be null.
+
4.51 KVM_DEASSIGN_DEV_IRQ
Capability: KVM_CAP_ASSIGN_DEV_IRQ
@@ -1245,6 +1303,7 @@
by assigned_dev_id, flags must correspond to the IRQ type specified on
KVM_ASSIGN_DEV_IRQ. Partial deassignment of host or guest IRQ is allowed.
+
4.52 KVM_SET_GSI_ROUTING
Capability: KVM_CAP_IRQ_ROUTING
@@ -1293,6 +1352,7 @@
__u32 pad;
};
+
4.53 KVM_ASSIGN_SET_MSIX_NR
Capability: KVM_CAP_DEVICE_MSIX
@@ -1314,6 +1374,7 @@
#define KVM_MAX_MSIX_PER_DEV 256
+
4.54 KVM_ASSIGN_SET_MSIX_ENTRY
Capability: KVM_CAP_DEVICE_MSIX
@@ -1332,7 +1393,8 @@
__u16 padding[3];
};
-4.54 KVM_SET_TSC_KHZ
+
+4.55 KVM_SET_TSC_KHZ
Capability: KVM_CAP_TSC_CONTROL
Architectures: x86
@@ -1343,7 +1405,8 @@
Specifies the tsc frequency for the virtual machine. The unit of the
frequency is KHz.
-4.55 KVM_GET_TSC_KHZ
+
+4.56 KVM_GET_TSC_KHZ
Capability: KVM_CAP_GET_TSC_KHZ
Architectures: x86
@@ -1355,7 +1418,8 @@
KHz. If the host has unstable tsc this ioctl returns -EIO instead as an
error.
-4.56 KVM_GET_LAPIC
+
+4.57 KVM_GET_LAPIC
Capability: KVM_CAP_IRQCHIP
Architectures: x86
@@ -1371,7 +1435,8 @@
Reads the Local APIC registers and copies them into the input argument. The
data format and layout are the same as documented in the architecture manual.
-4.57 KVM_SET_LAPIC
+
+4.58 KVM_SET_LAPIC
Capability: KVM_CAP_IRQCHIP
Architectures: x86
@@ -1387,7 +1452,8 @@
Copies the input argument into the the Local APIC registers. The data format
and layout are the same as documented in the architecture manual.
-4.58 KVM_IOEVENTFD
+
+4.59 KVM_IOEVENTFD
Capability: KVM_CAP_IOEVENTFD
Architectures: all
@@ -1417,7 +1483,8 @@
If datamatch flag is set, the event will be signaled only if the written value
to the registered address is equal to datamatch in struct kvm_ioeventfd.
-4.59 KVM_DIRTY_TLB
+
+4.60 KVM_DIRTY_TLB
Capability: KVM_CAP_SW_TLB
Architectures: ppc
@@ -1449,7 +1516,8 @@
should skip processing the bitmap and just invalidate everything. It must
be set to the number of set bits in the bitmap.
-4.60 KVM_ASSIGN_SET_INTX_MASK
+
+4.61 KVM_ASSIGN_SET_INTX_MASK
Capability: KVM_CAP_PCI_2_3
Architectures: x86
@@ -1482,6 +1550,7 @@
by assigned_dev_id. In the flags field, only KVM_DEV_ASSIGN_MASK_INTX is
evaluated.
+
4.62 KVM_CREATE_SPAPR_TCE
Capability: KVM_CAP_SPAPR_TCE
@@ -1517,6 +1586,7 @@
userspace update the TCE table directly which is useful in some
circumstances.
+
4.63 KVM_ALLOCATE_RMA
Capability: KVM_CAP_PPC_RMA
@@ -1549,6 +1619,7 @@
an RMA, or 1 if the processor can use an RMA but doesn't require it,
because it supports the Virtual RMA (VRMA) facility.
+
4.64 KVM_NMI
Capability: KVM_CAP_USER_NMI
@@ -1574,6 +1645,7 @@
Some guests configure the LINT1 NMI input to cause a panic, aiding in
debugging.
+
4.65 KVM_S390_UCAS_MAP
Capability: KVM_CAP_S390_UCONTROL
@@ -1593,6 +1665,7 @@
the vcpu's address space starting at "vcpu_addr". All parameters need to
be alligned by 1 megabyte.
+
4.66 KVM_S390_UCAS_UNMAP
Capability: KVM_CAP_S390_UCONTROL
@@ -1612,6 +1685,7 @@
"vcpu_addr" with the length "length". The field "user_addr" is ignored.
All parameters need to be alligned by 1 megabyte.
+
4.67 KVM_S390_VCPU_FAULT
Capability: KVM_CAP_S390_UCONTROL
@@ -1628,6 +1702,7 @@
controlled virtual machines to fault in the virtual cpu's lowcore pages
prior to calling the KVM_RUN ioctl.
+
4.68 KVM_SET_ONE_REG
Capability: KVM_CAP_ONE_REG
@@ -1653,6 +1728,7 @@
| |
PPC | KVM_REG_PPC_HIOR | 64
+
4.69 KVM_GET_ONE_REG
Capability: KVM_CAP_ONE_REG
@@ -1669,6 +1745,7 @@
The list of registers accessible using this interface is identical to the
list in 4.64.
+
4.70 KVM_KVMCLOCK_CTRL
Capability: KVM_CAP_KVMCLOCK_CTRL
@@ -1689,6 +1766,7 @@
itself or when a soft lockup is detected. This ioctl can be called any time
after pausing the vcpu, but before it is resumed.
+
4.71 KVM_SIGNAL_MSI
Capability: KVM_CAP_SIGNAL_MSI
@@ -1710,7 +1788,9 @@
No flags are defined so far. The corresponding field must be 0.
+
5. The kvm_run structure
+------------------------
Application code obtains a pointer to the kvm_run structure by
mmap()ing a vcpu fd. From that point, application code can control
@@ -1951,7 +2031,9 @@
};
+
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
@@ -1967,6 +2049,7 @@
Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL)
are not detailed, but errors with specific meanings are.
+
6.1 KVM_CAP_PPC_OSI
Architectures: ppc
@@ -1980,6 +2063,7 @@
When this capability is enabled, KVM_EXIT_OSI can occur.
+
6.2 KVM_CAP_PPC_PAPR
Architectures: ppc
@@ -1998,6 +2082,7 @@
When this capability is enabled, KVM_EXIT_PAPR_HCALL can occur.
+
6.3 KVM_CAP_SW_TLB
Architectures: ppc