Newer
Older
:Capability: KVM_CAP_ADJUST_CLOCK
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_clock_data (out)
:Returns: 0 on success, -1 on error
Gets the current timestamp of kvmclock as seen by the current guest. In
conjunction with KVM_SET_CLOCK, it is used to ensure monotonicity on scenarios
such as migration.
When KVM_CAP_ADJUST_CLOCK is passed to KVM_CHECK_EXTENSION, it returns the
set of bits that KVM can return in struct kvm_clock_data's flag member.
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
The following flags are defined:
KVM_CLOCK_TSC_STABLE
If set, the returned value is the exact kvmclock
value seen by all VCPUs at the instant when KVM_GET_CLOCK was called.
If clear, the returned value is simply CLOCK_MONOTONIC plus a constant
offset; the offset can be modified with KVM_SET_CLOCK. KVM will try
to make all VCPUs follow this clock, but the exact value read by each
VCPU could differ, because the host TSC is not stable.
KVM_CLOCK_REALTIME
If set, the `realtime` field in the kvm_clock_data
structure is populated with the value of the host's real time
clocksource at the instant when KVM_GET_CLOCK was called. If clear,
the `realtime` field does not contain a value.
KVM_CLOCK_HOST_TSC
If set, the `host_tsc` field in the kvm_clock_data
structure is populated with the value of the host's timestamp counter (TSC)
at the instant when KVM_GET_CLOCK was called. If clear, the `host_tsc` field
does not contain a value.
::
struct kvm_clock_data {
__u64 clock; /* kvmclock current value */
__u32 flags;
__u32 pad0;
__u64 realtime;
__u64 host_tsc;
__u32 pad[4];
:Capability: KVM_CAP_ADJUST_CLOCK
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_clock_data (in)
:Returns: 0 on success, -1 on error
Sets the current timestamp of kvmclock to the value specified in its parameter.
In conjunction with KVM_GET_CLOCK, it is used to ensure monotonicity on scenarios
such as migration.
The following flags can be passed:
KVM_CLOCK_REALTIME
If set, KVM will compare the value of the `realtime` field
with the value of the host's real time clocksource at the instant when
KVM_SET_CLOCK was called. The difference in elapsed time is added to the final
kvmclock value that will be provided to guests.
Other flags returned by ``KVM_GET_CLOCK`` are accepted but ignored.
::
struct kvm_clock_data {
__u64 clock; /* kvmclock current value */
__u32 flags;
__u32 pad0;
__u64 realtime;
__u64 host_tsc;
__u32 pad[4];
4.31 KVM_GET_VCPU_EVENTS
------------------------
:Capability: KVM_CAP_VCPU_EVENTS
:Extended by: KVM_CAP_INTR_SHADOW
:Architectures: x86, arm, arm64
:Type: vcpu ioctl
:Parameters: struct kvm_vcpu_event (out)
:Returns: 0 on success, -1 on error
Gets currently pending exceptions, interrupts, and NMIs as well as related
states of the vcpu.
::
struct kvm_vcpu_events {
struct {
__u8 injected;
__u8 nr;
__u8 has_error_code;
__u32 error_code;
} exception;
struct {
__u8 injected;
__u8 nr;
__u8 soft;
} interrupt;
struct {
__u8 injected;
__u8 pending;
__u8 masked;
__u8 pad;
} nmi;
__u32 sipi_vector;
struct {
__u8 smm;
__u8 pending;
__u8 smm_inside_nmi;
__u8 latched_init;
} smi;
__u8 reserved[27];
__u8 exception_has_payload;
__u64 exception_payload;
The following bits are defined in the flags field:
- KVM_VCPUEVENT_VALID_SHADOW may be set to signal that
interrupt.shadow contains a valid state.
- KVM_VCPUEVENT_VALID_SMM may be set to signal that smi contains a
valid state.
- KVM_VCPUEVENT_VALID_PAYLOAD may be set to signal that the
exception_has_payload, exception_payload, and exception.pending
fields contain a valid state. This bit will be set whenever
KVM_CAP_EXCEPTION_PAYLOAD is enabled.
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
If the guest accesses a device that is being emulated by the host kernel in
such a way that a real device would generate a physical SError, KVM may make
a virtual SError pending for that VCPU. This system error interrupt remains
pending until the guest takes the exception by unmasking PSTATE.A.
Running the VCPU may cause it to take a pending SError, or make an access that
causes an SError to become pending. The event's description is only valid while
the VPCU is not running.
This API provides a way to read and write the pending 'event' state that is not
visible to the guest. To save, restore or migrate a VCPU the struct representing
the state can be read then written using this GET/SET API, along with the other
guest-visible registers. It is not possible to 'cancel' an SError that has been
made pending.
A device being emulated in user-space may also wish to generate an SError. To do
this the events structure can be populated by user-space. The current state
should be read first, to ensure no existing SError is pending. If an existing
SError is pending, the architecture's 'Multiple SError interrupts' rules should
be followed. (2.5.3 of DDI0587.a "ARM Reliability, Availability, and
Serviceability (RAS) Specification").
SError exceptions always have an ESR value. Some CPUs have the ability to
specify what the virtual SError's ESR value should be. These systems will
advertise KVM_CAP_ARM_INJECT_SERROR_ESR. In this case exception.has_esr will
always have a non-zero value when read, and the agent making an SError pending
should specify the ISS field in the lower 24 bits of exception.serror_esr. If
the system supports KVM_CAP_ARM_INJECT_SERROR_ESR, but user-space sets the events
with exception.has_esr as zero, KVM will choose an ESR.
Specifying exception.has_esr on a system that does not support it will return
-EINVAL. Setting anything other than the lower 24bits of exception.serror_esr
will return -EINVAL.
It is not possible to read back a pending external abort (injected via
KVM_SET_VCPU_EVENTS or otherwise) because such an exception is always delivered
directly to the virtual CPU).
struct kvm_vcpu_events {
struct {
__u8 serror_pending;
__u8 serror_has_esr;
__u8 ext_dabt_pending;
__u8 pad[5];
__u64 serror_esr;
} exception;
__u32 reserved[12];
4.32 KVM_SET_VCPU_EVENTS
------------------------
:Capability: KVM_CAP_VCPU_EVENTS
:Extended by: KVM_CAP_INTR_SHADOW
:Architectures: x86, arm, arm64
:Type: vcpu ioctl
:Parameters: struct kvm_vcpu_event (in)
:Returns: 0 on success, -1 on error
Set pending exceptions, interrupts, and NMIs as well as related states of the
vcpu.
See KVM_GET_VCPU_EVENTS for the data structure.
Fields that may be modified asynchronously by running VCPUs can be excluded
from the update. These fields are nmi.pending, sipi_vector, smi.smm,
smi.pending. Keep the corresponding bits in the flags field cleared to
suppress overwriting the current in-kernel state. The bits are:
=============================== ==================================
KVM_VCPUEVENT_VALID_NMI_PENDING transfer nmi.pending to the kernel
KVM_VCPUEVENT_VALID_SIPI_VECTOR transfer sipi_vector
KVM_VCPUEVENT_VALID_SMM transfer the smi sub-struct.
=============================== ==================================
If KVM_CAP_INTR_SHADOW is available, KVM_VCPUEVENT_VALID_SHADOW can be set in
the flags field to signal that interrupt.shadow contains a valid state and
shall be written into the VCPU.
KVM_VCPUEVENT_VALID_SMM can only be set if KVM_CAP_X86_SMM is available.
If KVM_CAP_EXCEPTION_PAYLOAD is enabled, KVM_VCPUEVENT_VALID_PAYLOAD
can be set in the flags field to signal that the
exception_has_payload, exception_payload, and exception.pending fields
contain a valid state and shall be written into the VCPU.
User space may need to inject several types of events to the guest.
Set the pending SError exception state for this VCPU. It is not possible to
'cancel' an Serror that has been made pending.
If the guest performed an access to I/O memory which could not be handled by
userspace, for example because of missing instruction syndrome decode
information or because there is no device mapped at the accessed IPA, then
userspace can ask the kernel to inject an external abort using the address
from the exiting fault on the VCPU. It is a programming error to set
ext_dabt_pending after an exit which was not either KVM_EXIT_MMIO or
KVM_EXIT_ARM_NISV. This feature is only available if the system supports
KVM_CAP_ARM_INJECT_EXT_DABT. This is a helper which provides commonality in
how userspace reports accesses for the above cases to guests, across different
userspace implementations. Nevertheless, userspace can still emulate all Arm
exceptions by manipulating individual registers using the KVM_SET_ONE_REG API.
See KVM_GET_VCPU_EVENTS for the data structure.
----------------------
:Capability: KVM_CAP_DEBUGREGS
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_debugregs (out)
:Returns: 0 on success, -1 on error
Reads debug registers from the vcpu.
::
struct kvm_debugregs {
__u64 db[4];
__u64 dr6;
__u64 dr7;
__u64 flags;
__u64 reserved[9];
----------------------
:Capability: KVM_CAP_DEBUGREGS
:Architectures: x86
:Type: vm ioctl
:Parameters: struct kvm_debugregs (in)
:Returns: 0 on success, -1 on error
Writes debug registers into the vcpu.
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_MEMORY
:Architectures: all
:Type: vm ioctl
:Parameters: struct kvm_userspace_memory_region (in)
:Returns: 0 on success, -1 on error
struct kvm_userspace_memory_region {
__u32 slot;
__u32 flags;
__u64 guest_phys_addr;
__u64 memory_size; /* bytes */
__u64 userspace_addr; /* start of the userspace allocated memory */
/* for kvm_memory_region::flags */
#define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0)
#define KVM_MEM_READONLY (1UL << 1)
This ioctl allows the user to create, modify or delete a guest physical
memory slot. Bits 0-15 of "slot" specify the slot id and this value
should be less than the maximum number of user memory slots supported per
VM. The maximum allowed slots can be queried using KVM_CAP_NR_MEMSLOTS.
Slots may not overlap in guest physical address space.
If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 of "slot"
specifies the address space which is being modified. They must be
less than the value that KVM_CHECK_EXTENSION returns for the
KVM_CAP_MULTI_ADDRESS_SPACE capability. Slots in separate address spaces
are unrelated; the restriction on overlapping slots only applies within
each address space.
Deleting a slot is done by passing zero for memory_size. When changing
an existing slot, it may be moved in the guest physical memory space,
or its flags may be modified, but it may not be resized.
Memory for the region is taken starting at the address denoted by the
field userspace_addr, which must point at user addressable memory for
the entire memory slot size. Any object may back this memory, including
anonymous memory, ordinary files, and hugetlbfs.
On architectures that support a form of address tagging, userspace_addr must
be an untagged address.
It is recommended that the lower 21 bits of guest_phys_addr and userspace_addr
be identical. This allows large pages in the guest to be backed by large
pages in the host.
The flags field supports two flags: KVM_MEM_LOG_DIRTY_PAGES and
KVM_MEM_READONLY. The former can be set to instruct KVM to keep track of
writes to memory within the slot. See KVM_GET_DIRTY_LOG ioctl to know how to
use it. The latter can be set, if KVM_CAP_READONLY_MEM capability allows it,
to make a new slot read-only. In this case, writes to this memory will be
posted to userspace as KVM_EXIT_MMIO exits.
When the KVM_CAP_SYNC_MMU capability is available, changes in the backing of
the memory region are automatically reflected into the guest. For example, an
mmap() that affects the region will be made visible immediately. Another
example is madvise(MADV_DROP).
It is recommended to use this API instead of the KVM_SET_MEMORY_REGION ioctl.
The KVM_SET_MEMORY_REGION does not allow fine grained control over memory
allocation and is deprecated.
---------------------
:Capability: KVM_CAP_SET_TSS_ADDR
:Architectures: x86
:Type: vm ioctl
:Parameters: unsigned long tss_address (in)
:Returns: 0 on success, -1 on error
This ioctl defines the physical address of a three-page region in the guest
physical address space. The region must be within the first 4GB of the
guest physical address space and must not conflict with any memory slot
or any mmio address. The guest may malfunction if it accesses this memory
region.
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).
:Capability: KVM_CAP_ENABLE_CAP
:Architectures: mips, ppc, s390
:Type: vcpu ioctl
:Parameters: struct kvm_enable_cap (in)
:Returns: 0 on success; -1 on error
:Capability: KVM_CAP_ENABLE_CAP_VM
:Architectures: all
:Type: vm ioctl
:Parameters: struct kvm_enable_cap (in)
:Returns: 0 on success; -1 on error
.. note::
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.
The vcpu ioctl should be used for vcpu-specific capabilities, the vm ioctl
for vm-wide capabilities.
---------------------
:Capability: KVM_CAP_MP_STATE
:Architectures: x86, s390, arm, arm64, riscv
:Type: vcpu ioctl
:Parameters: struct kvm_mp_state (out)
:Returns: 0 on success; -1 on error
::
struct kvm_mp_state {
Returns the vcpu's current "multiprocessing state" (though also valid on
uniprocessor guests).
Possible values are:
========================== ===============================================
KVM_MP_STATE_RUNNABLE the vcpu is currently running
[x86,arm/arm64,riscv]
KVM_MP_STATE_UNINITIALIZED the vcpu is an application processor (AP)
which has not yet received an INIT signal [x86]
KVM_MP_STATE_INIT_RECEIVED the vcpu has received an INIT signal, and is
KVM_MP_STATE_HALTED the vcpu has executed a HLT instruction and
KVM_MP_STATE_SIPI_RECEIVED the vcpu has just received a SIPI (vector
accessible via KVM_GET_VCPU_EVENTS) [x86]
KVM_MP_STATE_STOPPED the vcpu is stopped [s390,arm/arm64,riscv]
KVM_MP_STATE_CHECK_STOP the vcpu is in a special error state [s390]
KVM_MP_STATE_OPERATING the vcpu is operating (running or halted)
[s390]
KVM_MP_STATE_LOAD the vcpu is in a special load/startup state
[s390]
========================== ===============================================
On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an
in-kernel irqchip, the multiprocessing state must be maintained by userspace on
these architectures.
For arm/arm64/riscv:
^^^^^^^^^^^^^^^^^^^^
The only states that are valid are KVM_MP_STATE_STOPPED and
KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not.
---------------------
:Capability: KVM_CAP_MP_STATE
:Architectures: x86, s390, arm, arm64, riscv
:Type: vcpu ioctl
:Parameters: struct kvm_mp_state (in)
:Returns: 0 on success; -1 on error
Sets the vcpu's current "multiprocessing state"; see KVM_GET_MP_STATE for
arguments.
On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an
in-kernel irqchip, the multiprocessing state must be maintained by userspace on
these architectures.
For arm/arm64/riscv:
^^^^^^^^^^^^^^^^^^^^
The only states that are valid are KVM_MP_STATE_STOPPED and
KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not.
4.40 KVM_SET_IDENTITY_MAP_ADDR
------------------------------
:Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR
:Architectures: x86
:Type: vm ioctl
:Parameters: unsigned long identity (in)
:Returns: 0 on success, -1 on error
This ioctl defines the physical address of a one-page region in the guest
physical address space. The region must be within the first 4GB of the
guest physical address space and must not conflict with any memory slot
or any mmio address. The guest may malfunction if it accesses this memory
region.
Setting the address to 0 will result in resetting the address to its default
(0xfffbc000).
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).
Fails if any VCPU has already been created.
4.41 KVM_SET_BOOT_CPU_ID
------------------------
:Capability: KVM_CAP_SET_BOOT_CPU_ID
:Architectures: x86
:Type: vm ioctl
:Parameters: unsigned long vcpu_id
:Returns: 0 on success, -1 on error
Define which vcpu is the Bootstrap Processor (BSP). Values are the same
as the vcpu id in KVM_CREATE_VCPU. If this ioctl is not called, the default
Emanuele Giuseppe Esposito
committed
is vcpu 0. This ioctl has to be called before vcpu creation,
otherwise it will return EBUSY error.
:Capability: KVM_CAP_XSAVE
:Architectures: x86
:Type: vcpu ioctl
:Parameters: struct kvm_xsave (out)
:Returns: 0 on success, -1 on error
::
This ioctl would copy current vcpu's xsave struct to the userspace.
:Capability: KVM_CAP_XSAVE
:Architectures: x86
:Type: vcpu ioctl
:Parameters: struct kvm_xsave (in)
:Returns: 0 on success, -1 on error
::
struct kvm_xsave {
This ioctl would copy userspace's xsave struct to the kernel.
:Capability: KVM_CAP_XCRS
:Architectures: x86
:Type: vcpu ioctl
:Parameters: struct kvm_xcrs (out)
:Returns: 0 on success, -1 on error
::
__u32 xcr;
__u32 reserved;
__u64 value;
__u32 nr_xcrs;
__u32 flags;
struct kvm_xcr xcrs[KVM_MAX_XCRS];
__u64 padding[16];
This ioctl would copy current vcpu's xcrs to the userspace.
:Capability: KVM_CAP_XCRS
:Architectures: x86
:Type: vcpu ioctl
:Parameters: struct kvm_xcrs (in)
:Returns: 0 on success, -1 on error
::
__u32 xcr;
__u32 reserved;
__u64 value;
__u32 nr_xcrs;
__u32 flags;
struct kvm_xcr xcrs[KVM_MAX_XCRS];
__u64 padding[16];
This ioctl would set vcpu's xcr to the value userspace specified.
4.46 KVM_GET_SUPPORTED_CPUID
----------------------------
:Capability: KVM_CAP_EXT_CPUID
:Architectures: x86
:Type: system ioctl
:Parameters: struct kvm_cpuid2 (in/out)
:Returns: 0 on success, -1 on error
__u32 nent;
__u32 padding;
struct kvm_cpuid_entry2 entries[0];
#define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0)
#define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) /* deprecated */
#define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) /* deprecated */
struct kvm_cpuid_entry2 {
__u32 function;
__u32 index;
__u32 flags;
__u32 eax;
__u32 ebx;
__u32 ecx;
__u32 edx;
__u32 padding[3];
This ioctl returns x86 cpuid features which are supported by both the
hardware and kvm in its default configuration. Userspace can use the
information returned by this ioctl to construct cpuid information (for
KVM_SET_CPUID2) that is consistent with hardware, kernel, and
userspace capabilities, and with user requirements (for example, the
user may wish to constrain cpuid to emulate older hardware, or for
feature consistency across a cluster).
Note that certain capabilities, such as KVM_CAP_X86_DISABLE_EXITS, may
expose cpuid features (e.g. MONITOR) which are not supported by kvm in
its default configuration. If userspace enables such capabilities, it
is responsible for modifying the results of this ioctl appropriately.
Userspace invokes KVM_GET_SUPPORTED_CPUID by passing a kvm_cpuid2 structure
with the 'nent' field indicating the number of entries in the variable-size
array 'entries'. If the number of entries is too low to describe the cpu
capabilities, an error (E2BIG) is returned. If the number is too high,
the 'nent' field is adjusted and an error (ENOMEM) is returned. If the
number is just right, the 'nent' field is adjusted to the number of valid
entries in the 'entries' array, which is then filled.
The entries returned are the host cpuid as returned by the cpuid instruction,
with unknown or unsupported features masked out. Some features (for example,
x2apic), may not be present in the host cpu, but are exposed by kvm if it can
emulate them efficiently. The fields in each entry are defined as follows:
function:
the eax value used to obtain the entry
index:
the ecx value used to obtain the entry (for entries that are
flags:
an OR of zero or more of the following:
KVM_CPUID_FLAG_SIGNIFCANT_INDEX:
if the index field is valid
eax, ebx, ecx, edx:
the values returned by the cpuid instruction for
this function/index combination
The TSC deadline timer feature (CPUID leaf 1, ecx[24]) is always returned
as false, since the feature depends on KVM_CREATE_IRQCHIP for local APIC
support. Instead it is reported via::
ioctl(KVM_CHECK_EXTENSION, KVM_CAP_TSC_DEADLINE_TIMER)
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
:Architectures: ppc
:Type: vm ioctl
:Parameters: struct kvm_ppc_pvinfo (out)
:Returns: 0 on success, !0 on error
struct kvm_ppc_pvinfo {
__u32 flags;
__u32 hcall[4];
__u8 pad[108];
This ioctl fetches PV specific information that need to be passed to the guest
using the device tree or other means from vm context.
The hcall array defines 4 instructions that make up a hypercall.
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.
The flags bitmap is defined as::
/* the host supports the ePAPR idle hcall
#define KVM_PPC_PVINFO_FLAGS_EV_IDLE (1<<0)
4.52 KVM_SET_GSI_ROUTING
------------------------
:Capability: KVM_CAP_IRQ_ROUTING
:Architectures: x86 s390 arm arm64
:Type: vm ioctl
:Parameters: struct kvm_irq_routing (in)
:Returns: 0 on success, -1 on error
Sets the GSI routing table entries, overwriting any previously set entries.
On arm/arm64, GSI routing has the following limitation:
- GSI routing does not apply to KVM_IRQ_LINE but only to KVM_IRQFD.
::
struct kvm_irq_routing {
__u32 nr;
__u32 flags;
struct kvm_irq_routing_entry entries[0];
No flags are specified so far, the corresponding field must be set to zero.
::
struct kvm_irq_routing_entry {
__u32 gsi;
__u32 type;
__u32 flags;
__u32 pad;
union {
struct kvm_irq_routing_irqchip irqchip;
struct kvm_irq_routing_msi msi;
struct kvm_irq_routing_s390_adapter adapter;
struct kvm_irq_routing_hv_sint hv_sint;
/* gsi routing entry types */
#define KVM_IRQ_ROUTING_IRQCHIP 1
#define KVM_IRQ_ROUTING_MSI 2
#define KVM_IRQ_ROUTING_S390_ADAPTER 3
#define KVM_IRQ_ROUTING_HV_SINT 4
- KVM_MSI_VALID_DEVID: used along with KVM_IRQ_ROUTING_MSI routing entry
type, specifies that the devid field contains a valid value. The per-VM
KVM_CAP_MSI_DEVID capability advertises the requirement to provide
the device ID. If this capability is not available, userspace should
never set the KVM_MSI_VALID_DEVID flag as the ioctl might fail.
::
struct kvm_irq_routing_irqchip {
struct kvm_irq_routing_msi {
__u32 address_lo;
__u32 address_hi;
__u32 data;
union {
__u32 pad;
__u32 devid;
};
If KVM_MSI_VALID_DEVID is set, devid contains a unique device identifier
for the device that wrote the MSI message. For PCI, this is usually a
BFD identifier in the lower 16 bits.
On x86, address_hi is ignored unless the KVM_X2APIC_API_USE_32BIT_IDS
feature of KVM_CAP_X2APIC_API capability is enabled. If it is enabled,
address_hi bits 31-8 provide bits 31-8 of the destination id. Bits 7-0 of
address_hi must be zero.
::
struct kvm_irq_routing_s390_adapter {
__u64 ind_addr;
__u64 summary_addr;
__u64 ind_offset;
__u32 summary_offset;
__u32 adapter_id;
struct kvm_irq_routing_hv_sint {
__u32 vcpu;
__u32 sint;
:Capability: KVM_CAP_TSC_CONTROL
:Architectures: x86
:Type: vcpu ioctl
:Parameters: virtual tsc_khz
:Returns: 0 on success, -1 on error
Specifies the tsc frequency for the virtual machine. The unit of the
frequency is KHz.
:Capability: KVM_CAP_GET_TSC_KHZ
:Architectures: x86
:Type: vcpu ioctl
:Parameters: none
:Returns: virtual tsc-khz on success, negative value on error
Returns the tsc frequency of the guest. The unit of the return value is
KHz. If the host has unstable tsc this ioctl returns -EIO instead as an
error.
:Capability: KVM_CAP_IRQCHIP
:Architectures: x86
:Type: vcpu ioctl
:Parameters: struct kvm_lapic_state (out)
:Returns: 0 on success, -1 on error
::
#define KVM_APIC_REG_SIZE 0x400
struct kvm_lapic_state {
char regs[KVM_APIC_REG_SIZE];
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.
If KVM_X2APIC_API_USE_32BIT_IDS feature of KVM_CAP_X2APIC_API is
enabled, then the format of APIC_ID register depends on the APIC mode
(reported by MSR_IA32_APICBASE) of its VCPU. x2APIC stores APIC ID in
the APIC_ID register (bytes 32-35). xAPIC only allows an 8-bit APIC ID
which is stored in bits 31-24 of the APIC register, or equivalently in
byte 35 of struct kvm_lapic_state's regs field. KVM_GET_LAPIC must then
be called after MSR_IA32_APICBASE has been set with KVM_SET_MSR.
If KVM_X2APIC_API_USE_32BIT_IDS feature is disabled, struct kvm_lapic_state
always uses xAPIC format.
:Capability: KVM_CAP_IRQCHIP
:Architectures: x86
:Type: vcpu ioctl
:Parameters: struct kvm_lapic_state (in)
:Returns: 0 on success, -1 on error
::
#define KVM_APIC_REG_SIZE 0x400
struct kvm_lapic_state {
char regs[KVM_APIC_REG_SIZE];
Copies the input argument into the Local APIC registers. The data format
and layout are the same as documented in the architecture manual.
The format of the APIC ID register (bytes 32-35 of struct kvm_lapic_state's
regs field) depends on the state of the KVM_CAP_X2APIC_API capability.
See the note in KVM_GET_LAPIC.
:Capability: KVM_CAP_IOEVENTFD
:Architectures: all
:Type: vm ioctl
:Parameters: struct kvm_ioeventfd (in)
:Returns: 0 on success, !0 on error
This ioctl attaches or detaches an ioeventfd to a legal pio/mmio address
within the guest. A guest write in the registered address will signal the
provided event instead of triggering an exit.
::
struct kvm_ioeventfd {
__u64 datamatch;
__u64 addr; /* legal pio/mmio address */
__u32 len; /* 0, 1, 2, 4, or 8 bytes */
__s32 fd;
__u32 flags;
__u8 pad[36];
For the special case of virtio-ccw devices on s390, the ioevent is matched
to a subchannel/virtqueue tuple instead.
The following flags are defined::
#define KVM_IOEVENTFD_FLAG_DATAMATCH (1 << kvm_ioeventfd_flag_nr_datamatch)
#define KVM_IOEVENTFD_FLAG_PIO (1 << kvm_ioeventfd_flag_nr_pio)
#define KVM_IOEVENTFD_FLAG_DEASSIGN (1 << kvm_ioeventfd_flag_nr_deassign)
#define KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY \
(1 << kvm_ioeventfd_flag_nr_virtio_ccw_notify)
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.
For virtio-ccw devices, addr contains the subchannel id and datamatch the
virtqueue index.
With KVM_CAP_IOEVENTFD_ANY_LENGTH, a zero length ioeventfd is allowed, and
the kernel will ignore the length of guest write and may get a faster vmexit.
The speedup may only apply to specific architectures, but the ioeventfd will
work anyway.
:Capability: KVM_CAP_SW_TLB
:Architectures: ppc
:Type: vcpu ioctl
:Parameters: struct kvm_dirty_tlb (in)
:Returns: 0 on success, -1 on error
::