1274 строки
34 KiB
Plaintext
1274 строки
34 KiB
Plaintext
The Definitive KVM (Kernel-based Virtual Machine) API Documentation
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===================================================================
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1. General description
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The kvm API is a set of ioctls that are issued to control various aspects
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of a virtual machine. The ioctls belong to three classes
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- System ioctls: These query and set global attributes which affect the
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whole kvm subsystem. In addition a system ioctl is used to create
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virtual machines
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- VM ioctls: These query and set attributes that affect an entire virtual
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machine, for example memory layout. In addition a VM ioctl is used to
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create virtual cpus (vcpus).
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Only run VM ioctls from the same process (address space) that was used
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to create the VM.
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- vcpu ioctls: These query and set attributes that control the operation
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of a single virtual cpu.
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Only run vcpu ioctls from the same thread that was used to create the
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vcpu.
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2. File descriptors
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The kvm API is centered around file descriptors. An initial
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open("/dev/kvm") obtains a handle to the kvm subsystem; this handle
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can be used to issue system ioctls. A KVM_CREATE_VM ioctl on this
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handle will create a VM file descriptor which can be used to issue VM
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ioctls. A KVM_CREATE_VCPU ioctl on a VM fd will create a virtual cpu
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and return a file descriptor pointing to it. Finally, ioctls on a vcpu
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fd can be used to control the vcpu, including the important task of
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actually running guest code.
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In general file descriptors can be migrated among processes by means
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of fork() and the SCM_RIGHTS facility of unix domain socket. These
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kinds of tricks are explicitly not supported by kvm. While they will
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not cause harm to the host, their actual behavior is not guaranteed by
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the API. The only supported use is one virtual machine per process,
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and one vcpu per thread.
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3. Extensions
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As of Linux 2.6.22, the KVM ABI has been stabilized: no backward
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incompatible change are allowed. However, there is an extension
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facility that allows backward-compatible extensions to the API to be
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queried and used.
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The extension mechanism is not based on on the Linux version number.
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Instead, kvm defines extension identifiers and a facility to query
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whether a particular extension identifier is available. If it is, a
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set of ioctls is available for application use.
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4. API description
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This section describes ioctls that can be used to control kvm guests.
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For each ioctl, the following information is provided along with a
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description:
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Capability: which KVM extension provides this ioctl. Can be 'basic',
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which means that is will be provided by any kernel that supports
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API version 12 (see section 4.1), or a KVM_CAP_xyz constant, which
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means availability needs to be checked with KVM_CHECK_EXTENSION
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(see section 4.4).
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Architectures: which instruction set architectures provide this ioctl.
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x86 includes both i386 and x86_64.
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Type: system, vm, or vcpu.
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Parameters: what parameters are accepted by the ioctl.
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Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL)
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are not detailed, but errors with specific meanings are.
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4.1 KVM_GET_API_VERSION
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Capability: basic
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Architectures: all
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Type: system ioctl
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Parameters: none
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Returns: the constant KVM_API_VERSION (=12)
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This identifies the API version as the stable kvm API. It is not
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expected that this number will change. However, Linux 2.6.20 and
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2.6.21 report earlier versions; these are not documented and not
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supported. Applications should refuse to run if KVM_GET_API_VERSION
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returns a value other than 12. If this check passes, all ioctls
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described as 'basic' will be available.
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4.2 KVM_CREATE_VM
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Capability: basic
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Architectures: all
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Type: system ioctl
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Parameters: none
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Returns: a VM fd that can be used to control the new virtual machine.
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The new VM has no virtual cpus and no memory. An mmap() of a VM fd
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will access the virtual machine's physical address space; offset zero
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corresponds to guest physical address zero. Use of mmap() on a VM fd
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is discouraged if userspace memory allocation (KVM_CAP_USER_MEMORY) is
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available.
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4.3 KVM_GET_MSR_INDEX_LIST
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Capability: basic
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Architectures: x86
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Type: system
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Parameters: struct kvm_msr_list (in/out)
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Returns: 0 on success; -1 on error
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Errors:
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E2BIG: the msr index list is to be to fit in the array specified by
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the user.
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struct kvm_msr_list {
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__u32 nmsrs; /* number of msrs in entries */
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__u32 indices[0];
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};
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This ioctl returns the guest msrs that are supported. The list varies
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by kvm version and host processor, but does not change otherwise. The
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user fills in the size of the indices array in nmsrs, and in return
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kvm adjusts nmsrs to reflect the actual number of msrs and fills in
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the indices array with their numbers.
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Note: if kvm indicates supports MCE (KVM_CAP_MCE), then the MCE bank MSRs are
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not returned in the MSR list, as different vcpus can have a different number
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of banks, as set via the KVM_X86_SETUP_MCE ioctl.
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4.4 KVM_CHECK_EXTENSION
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Capability: basic
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Architectures: all
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Type: system ioctl
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Parameters: extension identifier (KVM_CAP_*)
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Returns: 0 if unsupported; 1 (or some other positive integer) if supported
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The API allows the application to query about extensions to the core
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kvm API. Userspace passes an extension identifier (an integer) and
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receives an integer that describes the extension availability.
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Generally 0 means no and 1 means yes, but some extensions may report
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additional information in the integer return value.
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4.5 KVM_GET_VCPU_MMAP_SIZE
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Capability: basic
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Architectures: all
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Type: system ioctl
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Parameters: none
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Returns: size of vcpu mmap area, in bytes
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The KVM_RUN ioctl (cf.) communicates with userspace via a shared
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memory region. This ioctl returns the size of that region. See the
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KVM_RUN documentation for details.
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4.6 KVM_SET_MEMORY_REGION
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Capability: basic
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Architectures: all
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Type: vm ioctl
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Parameters: struct kvm_memory_region (in)
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Returns: 0 on success, -1 on error
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This ioctl is obsolete and has been removed.
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4.6 KVM_CREATE_VCPU
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Capability: basic
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Architectures: all
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Type: vm ioctl
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Parameters: vcpu id (apic id on x86)
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Returns: vcpu fd on success, -1 on error
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This API adds a vcpu to a virtual machine. The vcpu id is a small integer
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in the range [0, max_vcpus).
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4.7 KVM_GET_DIRTY_LOG (vm ioctl)
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Capability: basic
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Architectures: x86
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Type: vm ioctl
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Parameters: struct kvm_dirty_log (in/out)
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Returns: 0 on success, -1 on error
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/* for KVM_GET_DIRTY_LOG */
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struct kvm_dirty_log {
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__u32 slot;
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__u32 padding;
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union {
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void __user *dirty_bitmap; /* one bit per page */
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__u64 padding;
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};
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};
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Given a memory slot, return a bitmap containing any pages dirtied
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since the last call to this ioctl. Bit 0 is the first page in the
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memory slot. Ensure the entire structure is cleared to avoid padding
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issues.
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4.8 KVM_SET_MEMORY_ALIAS
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Capability: basic
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Architectures: x86
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Type: vm ioctl
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Parameters: struct kvm_memory_alias (in)
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Returns: 0 (success), -1 (error)
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This ioctl is obsolete and has been removed.
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4.9 KVM_RUN
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Capability: basic
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Architectures: all
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Type: vcpu ioctl
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Parameters: none
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Returns: 0 on success, -1 on error
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Errors:
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EINTR: an unmasked signal is pending
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This ioctl is used to run a guest virtual cpu. While there are no
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explicit parameters, there is an implicit parameter block that can be
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obtained by mmap()ing the vcpu fd at offset 0, with the size given by
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KVM_GET_VCPU_MMAP_SIZE. The parameter block is formatted as a 'struct
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kvm_run' (see below).
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4.10 KVM_GET_REGS
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Capability: basic
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Architectures: all
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Type: vcpu ioctl
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Parameters: struct kvm_regs (out)
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Returns: 0 on success, -1 on error
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Reads the general purpose registers from the vcpu.
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/* x86 */
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struct kvm_regs {
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/* out (KVM_GET_REGS) / in (KVM_SET_REGS) */
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__u64 rax, rbx, rcx, rdx;
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__u64 rsi, rdi, rsp, rbp;
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__u64 r8, r9, r10, r11;
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__u64 r12, r13, r14, r15;
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__u64 rip, rflags;
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};
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4.11 KVM_SET_REGS
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Capability: basic
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Architectures: all
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Type: vcpu ioctl
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Parameters: struct kvm_regs (in)
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Returns: 0 on success, -1 on error
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Writes the general purpose registers into the vcpu.
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See KVM_GET_REGS for the data structure.
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4.12 KVM_GET_SREGS
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_sregs (out)
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Returns: 0 on success, -1 on error
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Reads special registers from the vcpu.
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/* x86 */
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struct kvm_sregs {
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struct kvm_segment cs, ds, es, fs, gs, ss;
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struct kvm_segment tr, ldt;
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struct kvm_dtable gdt, idt;
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__u64 cr0, cr2, cr3, cr4, cr8;
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__u64 efer;
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__u64 apic_base;
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__u64 interrupt_bitmap[(KVM_NR_INTERRUPTS + 63) / 64];
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};
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interrupt_bitmap is a bitmap of pending external interrupts. At most
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one bit may be set. This interrupt has been acknowledged by the APIC
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but not yet injected into the cpu core.
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4.13 KVM_SET_SREGS
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_sregs (in)
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Returns: 0 on success, -1 on error
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Writes special registers into the vcpu. See KVM_GET_SREGS for the
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data structures.
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4.14 KVM_TRANSLATE
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_translation (in/out)
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Returns: 0 on success, -1 on error
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Translates a virtual address according to the vcpu's current address
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translation mode.
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struct kvm_translation {
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/* in */
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__u64 linear_address;
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/* out */
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__u64 physical_address;
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__u8 valid;
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__u8 writeable;
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__u8 usermode;
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__u8 pad[5];
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};
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4.15 KVM_INTERRUPT
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Capability: basic
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Architectures: x86, ppc
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Type: vcpu ioctl
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Parameters: struct kvm_interrupt (in)
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Returns: 0 on success, -1 on error
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Queues a hardware interrupt vector to be injected. This is only
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useful if in-kernel local APIC or equivalent is not used.
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/* for KVM_INTERRUPT */
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struct kvm_interrupt {
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/* in */
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__u32 irq;
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};
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X86:
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Note 'irq' is an interrupt vector, not an interrupt pin or line.
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PPC:
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Queues an external interrupt to be injected. This ioctl is overleaded
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with 3 different irq values:
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a) KVM_INTERRUPT_SET
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This injects an edge type external interrupt into the guest once it's ready
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to receive interrupts. When injected, the interrupt is done.
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b) KVM_INTERRUPT_UNSET
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This unsets any pending interrupt.
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Only available with KVM_CAP_PPC_UNSET_IRQ.
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c) KVM_INTERRUPT_SET_LEVEL
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This injects a level type external interrupt into the guest context. The
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interrupt stays pending until a specific ioctl with KVM_INTERRUPT_UNSET
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is triggered.
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Only available with KVM_CAP_PPC_IRQ_LEVEL.
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Note that any value for 'irq' other than the ones stated above is invalid
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and incurs unexpected behavior.
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4.16 KVM_DEBUG_GUEST
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Capability: basic
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Architectures: none
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Type: vcpu ioctl
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Parameters: none)
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Returns: -1 on error
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Support for this has been removed. Use KVM_SET_GUEST_DEBUG instead.
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4.17 KVM_GET_MSRS
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_msrs (in/out)
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Returns: 0 on success, -1 on error
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Reads model-specific registers from the vcpu. Supported msr indices can
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be obtained using KVM_GET_MSR_INDEX_LIST.
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struct kvm_msrs {
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__u32 nmsrs; /* number of msrs in entries */
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__u32 pad;
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struct kvm_msr_entry entries[0];
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};
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struct kvm_msr_entry {
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__u32 index;
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__u32 reserved;
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__u64 data;
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};
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Application code should set the 'nmsrs' member (which indicates the
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size of the entries array) and the 'index' member of each array entry.
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kvm will fill in the 'data' member.
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4.18 KVM_SET_MSRS
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_msrs (in)
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Returns: 0 on success, -1 on error
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Writes model-specific registers to the vcpu. See KVM_GET_MSRS for the
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data structures.
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Application code should set the 'nmsrs' member (which indicates the
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size of the entries array), and the 'index' and 'data' members of each
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array entry.
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4.19 KVM_SET_CPUID
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_cpuid (in)
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Returns: 0 on success, -1 on error
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Defines the vcpu responses to the cpuid instruction. Applications
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should use the KVM_SET_CPUID2 ioctl if available.
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struct kvm_cpuid_entry {
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__u32 function;
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__u32 eax;
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__u32 ebx;
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__u32 ecx;
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__u32 edx;
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__u32 padding;
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};
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/* for KVM_SET_CPUID */
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struct kvm_cpuid {
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__u32 nent;
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__u32 padding;
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struct kvm_cpuid_entry entries[0];
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};
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4.20 KVM_SET_SIGNAL_MASK
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_signal_mask (in)
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Returns: 0 on success, -1 on error
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Defines which signals are blocked during execution of KVM_RUN. This
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signal mask temporarily overrides the threads signal mask. Any
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unblocked signal received (except SIGKILL and SIGSTOP, which retain
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their traditional behaviour) will cause KVM_RUN to return with -EINTR.
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Note the signal will only be delivered if not blocked by the original
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signal mask.
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/* for KVM_SET_SIGNAL_MASK */
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struct kvm_signal_mask {
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__u32 len;
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__u8 sigset[0];
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};
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4.21 KVM_GET_FPU
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_fpu (out)
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Returns: 0 on success, -1 on error
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Reads the floating point state from the vcpu.
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/* for KVM_GET_FPU and KVM_SET_FPU */
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struct kvm_fpu {
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__u8 fpr[8][16];
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__u16 fcw;
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__u16 fsw;
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__u8 ftwx; /* in fxsave format */
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__u8 pad1;
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__u16 last_opcode;
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__u64 last_ip;
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__u64 last_dp;
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__u8 xmm[16][16];
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__u32 mxcsr;
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__u32 pad2;
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};
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4.22 KVM_SET_FPU
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Capability: basic
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Architectures: x86
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Type: vcpu ioctl
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Parameters: struct kvm_fpu (in)
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Returns: 0 on success, -1 on error
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Writes the floating point state to the vcpu.
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/* for KVM_GET_FPU and KVM_SET_FPU */
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struct kvm_fpu {
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__u8 fpr[8][16];
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__u16 fcw;
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__u16 fsw;
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__u8 ftwx; /* in fxsave format */
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__u8 pad1;
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__u16 last_opcode;
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__u64 last_ip;
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__u64 last_dp;
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__u8 xmm[16][16];
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__u32 mxcsr;
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__u32 pad2;
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};
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4.23 KVM_CREATE_IRQCHIP
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Capability: KVM_CAP_IRQCHIP
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Architectures: x86, ia64
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Type: vm ioctl
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Parameters: none
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Returns: 0 on success, -1 on error
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Creates an interrupt controller model in the kernel. On x86, creates a virtual
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ioapic, a virtual PIC (two PICs, nested), and sets up future vcpus to have a
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local APIC. IRQ routing for GSIs 0-15 is set to both PIC and IOAPIC; GSI 16-23
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only go to the IOAPIC. On ia64, a IOSAPIC is created.
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4.24 KVM_IRQ_LINE
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Capability: KVM_CAP_IRQCHIP
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Architectures: x86, ia64
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Type: vm ioctl
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Parameters: struct kvm_irq_level
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Returns: 0 on success, -1 on error
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Sets the level of a GSI input to the interrupt controller model in the kernel.
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Requires that an interrupt controller model has been previously created with
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KVM_CREATE_IRQCHIP. Note that edge-triggered interrupts require the level
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to be set to 1 and then back to 0.
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struct kvm_irq_level {
|
|
union {
|
|
__u32 irq; /* GSI */
|
|
__s32 status; /* not used for KVM_IRQ_LEVEL */
|
|
};
|
|
__u32 level; /* 0 or 1 */
|
|
};
|
|
|
|
4.25 KVM_GET_IRQCHIP
|
|
|
|
Capability: KVM_CAP_IRQCHIP
|
|
Architectures: x86, ia64
|
|
Type: vm ioctl
|
|
Parameters: struct kvm_irqchip (in/out)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
Reads the state of a kernel interrupt controller created with
|
|
KVM_CREATE_IRQCHIP into a buffer provided by the caller.
|
|
|
|
struct kvm_irqchip {
|
|
__u32 chip_id; /* 0 = PIC1, 1 = PIC2, 2 = IOAPIC */
|
|
__u32 pad;
|
|
union {
|
|
char dummy[512]; /* reserving space */
|
|
struct kvm_pic_state pic;
|
|
struct kvm_ioapic_state ioapic;
|
|
} chip;
|
|
};
|
|
|
|
4.26 KVM_SET_IRQCHIP
|
|
|
|
Capability: KVM_CAP_IRQCHIP
|
|
Architectures: x86, ia64
|
|
Type: vm ioctl
|
|
Parameters: struct kvm_irqchip (in)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
Sets the state of a kernel interrupt controller created with
|
|
KVM_CREATE_IRQCHIP from a buffer provided by the caller.
|
|
|
|
struct kvm_irqchip {
|
|
__u32 chip_id; /* 0 = PIC1, 1 = PIC2, 2 = IOAPIC */
|
|
__u32 pad;
|
|
union {
|
|
char dummy[512]; /* reserving space */
|
|
struct kvm_pic_state pic;
|
|
struct kvm_ioapic_state ioapic;
|
|
} chip;
|
|
};
|
|
|
|
4.27 KVM_XEN_HVM_CONFIG
|
|
|
|
Capability: KVM_CAP_XEN_HVM
|
|
Architectures: x86
|
|
Type: vm ioctl
|
|
Parameters: struct kvm_xen_hvm_config (in)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
Sets the MSR that the Xen HVM guest uses to initialize its hypercall
|
|
page, and provides the starting address and size of the hypercall
|
|
blobs in userspace. When the guest writes the MSR, kvm copies one
|
|
page of a blob (32- or 64-bit, depending on the vcpu mode) to guest
|
|
memory.
|
|
|
|
struct kvm_xen_hvm_config {
|
|
__u32 flags;
|
|
__u32 msr;
|
|
__u64 blob_addr_32;
|
|
__u64 blob_addr_64;
|
|
__u8 blob_size_32;
|
|
__u8 blob_size_64;
|
|
__u8 pad2[30];
|
|
};
|
|
|
|
4.27 KVM_GET_CLOCK
|
|
|
|
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.
|
|
|
|
struct kvm_clock_data {
|
|
__u64 clock; /* kvmclock current value */
|
|
__u32 flags;
|
|
__u32 pad[9];
|
|
};
|
|
|
|
4.28 KVM_SET_CLOCK
|
|
|
|
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.
|
|
|
|
struct kvm_clock_data {
|
|
__u64 clock; /* kvmclock current value */
|
|
__u32 flags;
|
|
__u32 pad[9];
|
|
};
|
|
|
|
4.29 KVM_GET_VCPU_EVENTS
|
|
|
|
Capability: KVM_CAP_VCPU_EVENTS
|
|
Extended by: KVM_CAP_INTR_SHADOW
|
|
Architectures: x86
|
|
Type: vm 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;
|
|
__u8 pad;
|
|
__u32 error_code;
|
|
} exception;
|
|
struct {
|
|
__u8 injected;
|
|
__u8 nr;
|
|
__u8 soft;
|
|
__u8 shadow;
|
|
} interrupt;
|
|
struct {
|
|
__u8 injected;
|
|
__u8 pending;
|
|
__u8 masked;
|
|
__u8 pad;
|
|
} nmi;
|
|
__u32 sipi_vector;
|
|
__u32 flags;
|
|
};
|
|
|
|
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.
|
|
|
|
4.30 KVM_SET_VCPU_EVENTS
|
|
|
|
Capability: KVM_CAP_VCPU_EVENTS
|
|
Extended by: KVM_CAP_INTR_SHADOW
|
|
Architectures: x86
|
|
Type: vm 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 and sipi_vector. 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
|
|
|
|
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.
|
|
|
|
4.32 KVM_GET_DEBUGREGS
|
|
|
|
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];
|
|
};
|
|
|
|
4.33 KVM_SET_DEBUGREGS
|
|
|
|
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.
|
|
|
|
4.34 KVM_SET_USER_MEMORY_REGION
|
|
|
|
Capability: KVM_CAP_USER_MEM
|
|
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
|
|
|
|
This ioctl allows the user to create or modify a guest physical memory
|
|
slot. When changing an existing slot, it may be moved in the guest
|
|
physical memory space, or its flags may be modified. It may not be
|
|
resized. Slots may not overlap in guest physical address space.
|
|
|
|
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.
|
|
|
|
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 just one flag, KVM_MEM_LOG_DIRTY_PAGES, which
|
|
instructs kvm to keep track of writes to memory within the slot. See
|
|
the KVM_GET_DIRTY_LOG ioctl.
|
|
|
|
When the KVM_CAP_SYNC_MMU capability, 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.
|
|
|
|
4.35 KVM_SET_TSS_ADDR
|
|
|
|
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).
|
|
|
|
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];
|
|
};
|
|
|
|
4.37 KVM_GET_MP_STATE
|
|
|
|
Capability: KVM_CAP_MP_STATE
|
|
Architectures: x86, ia64
|
|
Type: vcpu ioctl
|
|
Parameters: struct kvm_mp_state (out)
|
|
Returns: 0 on success; -1 on error
|
|
|
|
struct kvm_mp_state {
|
|
__u32 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
|
|
- KVM_MP_STATE_UNINITIALIZED: the vcpu is an application processor (AP)
|
|
which has not yet received an INIT signal
|
|
- KVM_MP_STATE_INIT_RECEIVED: the vcpu has received an INIT signal, and is
|
|
now ready for a SIPI
|
|
- KVM_MP_STATE_HALTED: the vcpu has executed a HLT instruction and
|
|
is waiting for an interrupt
|
|
- KVM_MP_STATE_SIPI_RECEIVED: the vcpu has just received a SIPI (vector
|
|
accesible via KVM_GET_VCPU_EVENTS)
|
|
|
|
This ioctl is only useful after KVM_CREATE_IRQCHIP. Without an in-kernel
|
|
irqchip, the multiprocessing state must be maintained by userspace.
|
|
|
|
4.38 KVM_SET_MP_STATE
|
|
|
|
Capability: KVM_CAP_MP_STATE
|
|
Architectures: x86, ia64
|
|
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.
|
|
|
|
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_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.
|
|
|
|
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).
|
|
|
|
4.40 KVM_SET_BOOT_CPU_ID
|
|
|
|
Capability: KVM_CAP_SET_BOOT_CPU_ID
|
|
Architectures: x86, ia64
|
|
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
|
|
is vcpu 0.
|
|
|
|
4.41 KVM_GET_XSAVE
|
|
|
|
Capability: KVM_CAP_XSAVE
|
|
Architectures: x86
|
|
Type: vcpu ioctl
|
|
Parameters: struct kvm_xsave (out)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
struct kvm_xsave {
|
|
__u32 region[1024];
|
|
};
|
|
|
|
This ioctl would copy current vcpu's xsave struct to the userspace.
|
|
|
|
4.42 KVM_SET_XSAVE
|
|
|
|
Capability: KVM_CAP_XSAVE
|
|
Architectures: x86
|
|
Type: vcpu ioctl
|
|
Parameters: struct kvm_xsave (in)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
struct kvm_xsave {
|
|
__u32 region[1024];
|
|
};
|
|
|
|
This ioctl would copy userspace's xsave struct to the kernel.
|
|
|
|
4.43 KVM_GET_XCRS
|
|
|
|
Capability: KVM_CAP_XCRS
|
|
Architectures: x86
|
|
Type: vcpu ioctl
|
|
Parameters: struct kvm_xcrs (out)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
struct kvm_xcr {
|
|
__u32 xcr;
|
|
__u32 reserved;
|
|
__u64 value;
|
|
};
|
|
|
|
struct kvm_xcrs {
|
|
__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.
|
|
|
|
4.44 KVM_SET_XCRS
|
|
|
|
Capability: KVM_CAP_XCRS
|
|
Architectures: x86
|
|
Type: vcpu ioctl
|
|
Parameters: struct kvm_xcrs (in)
|
|
Returns: 0 on success, -1 on error
|
|
|
|
struct kvm_xcr {
|
|
__u32 xcr;
|
|
__u32 reserved;
|
|
__u64 value;
|
|
};
|
|
|
|
struct kvm_xcrs {
|
|
__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.
|
|
|
|
4.45 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
|
|
|
|
struct kvm_cpuid2 {
|
|
__u32 nent;
|
|
__u32 padding;
|
|
struct kvm_cpuid_entry2 entries[0];
|
|
};
|
|
|
|
#define KVM_CPUID_FLAG_SIGNIFCANT_INDEX 1
|
|
#define KVM_CPUID_FLAG_STATEFUL_FUNC 2
|
|
#define KVM_CPUID_FLAG_STATE_READ_NEXT 4
|
|
|
|
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. 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).
|
|
|
|
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
|
|
affected by ecx)
|
|
flags: an OR of zero or more of the following:
|
|
KVM_CPUID_FLAG_SIGNIFCANT_INDEX:
|
|
if the index field is valid
|
|
KVM_CPUID_FLAG_STATEFUL_FUNC:
|
|
if cpuid for this function returns different values for successive
|
|
invocations; there will be several entries with the same function,
|
|
all with this flag set
|
|
KVM_CPUID_FLAG_STATE_READ_NEXT:
|
|
for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is
|
|
the first entry to be read by a cpu
|
|
eax, ebx, ecx, edx: the values returned by the cpuid instruction for
|
|
this function/index combination
|
|
|
|
4.46 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.
|
|
|
|
For now the only implemented piece of information distributed here is an array
|
|
of 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.
|
|
|
|
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
|
|
execution by changing fields in kvm_run prior to calling the KVM_RUN
|
|
ioctl, and obtain information about the reason KVM_RUN returned by
|
|
looking up structure members.
|
|
|
|
struct kvm_run {
|
|
/* in */
|
|
__u8 request_interrupt_window;
|
|
|
|
Request that KVM_RUN return when it becomes possible to inject external
|
|
interrupts into the guest. Useful in conjunction with KVM_INTERRUPT.
|
|
|
|
__u8 padding1[7];
|
|
|
|
/* out */
|
|
__u32 exit_reason;
|
|
|
|
When KVM_RUN has returned successfully (return value 0), this informs
|
|
application code why KVM_RUN has returned. Allowable values for this
|
|
field are detailed below.
|
|
|
|
__u8 ready_for_interrupt_injection;
|
|
|
|
If request_interrupt_window has been specified, this field indicates
|
|
an interrupt can be injected now with KVM_INTERRUPT.
|
|
|
|
__u8 if_flag;
|
|
|
|
The value of the current interrupt flag. Only valid if in-kernel
|
|
local APIC is not used.
|
|
|
|
__u8 padding2[2];
|
|
|
|
/* in (pre_kvm_run), out (post_kvm_run) */
|
|
__u64 cr8;
|
|
|
|
The value of the cr8 register. Only valid if in-kernel local APIC is
|
|
not used. Both input and output.
|
|
|
|
__u64 apic_base;
|
|
|
|
The value of the APIC BASE msr. Only valid if in-kernel local
|
|
APIC is not used. Both input and output.
|
|
|
|
union {
|
|
/* KVM_EXIT_UNKNOWN */
|
|
struct {
|
|
__u64 hardware_exit_reason;
|
|
} hw;
|
|
|
|
If exit_reason is KVM_EXIT_UNKNOWN, the vcpu has exited due to unknown
|
|
reasons. Further architecture-specific information is available in
|
|
hardware_exit_reason.
|
|
|
|
/* KVM_EXIT_FAIL_ENTRY */
|
|
struct {
|
|
__u64 hardware_entry_failure_reason;
|
|
} fail_entry;
|
|
|
|
If exit_reason is KVM_EXIT_FAIL_ENTRY, the vcpu could not be run due
|
|
to unknown reasons. Further architecture-specific information is
|
|
available in hardware_entry_failure_reason.
|
|
|
|
/* KVM_EXIT_EXCEPTION */
|
|
struct {
|
|
__u32 exception;
|
|
__u32 error_code;
|
|
} ex;
|
|
|
|
Unused.
|
|
|
|
/* KVM_EXIT_IO */
|
|
struct {
|
|
#define KVM_EXIT_IO_IN 0
|
|
#define KVM_EXIT_IO_OUT 1
|
|
__u8 direction;
|
|
__u8 size; /* bytes */
|
|
__u16 port;
|
|
__u32 count;
|
|
__u64 data_offset; /* relative to kvm_run start */
|
|
} io;
|
|
|
|
If exit_reason is KVM_EXIT_IO, then the vcpu has
|
|
executed a port I/O instruction which could not be satisfied by kvm.
|
|
data_offset describes where the data is located (KVM_EXIT_IO_OUT) or
|
|
where kvm expects application code to place the data for the next
|
|
KVM_RUN invocation (KVM_EXIT_IO_IN). Data format is a packed array.
|
|
|
|
struct {
|
|
struct kvm_debug_exit_arch arch;
|
|
} debug;
|
|
|
|
Unused.
|
|
|
|
/* KVM_EXIT_MMIO */
|
|
struct {
|
|
__u64 phys_addr;
|
|
__u8 data[8];
|
|
__u32 len;
|
|
__u8 is_write;
|
|
} mmio;
|
|
|
|
If exit_reason is KVM_EXIT_MMIO, then the vcpu has
|
|
executed a memory-mapped I/O instruction which could not be satisfied
|
|
by kvm. The 'data' member contains the written data if 'is_write' is
|
|
true, and should be filled by application code otherwise.
|
|
|
|
NOTE: For KVM_EXIT_IO, KVM_EXIT_MMIO and KVM_EXIT_OSI, the corresponding
|
|
operations are complete (and guest state is consistent) only after userspace
|
|
has re-entered the kernel with KVM_RUN. The kernel side will first finish
|
|
incomplete operations and then check for pending signals. Userspace
|
|
can re-enter the guest with an unmasked signal pending to complete
|
|
pending operations.
|
|
|
|
/* KVM_EXIT_HYPERCALL */
|
|
struct {
|
|
__u64 nr;
|
|
__u64 args[6];
|
|
__u64 ret;
|
|
__u32 longmode;
|
|
__u32 pad;
|
|
} hypercall;
|
|
|
|
Unused. This was once used for 'hypercall to userspace'. To implement
|
|
such functionality, use KVM_EXIT_IO (x86) or KVM_EXIT_MMIO (all except s390).
|
|
Note KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO.
|
|
|
|
/* KVM_EXIT_TPR_ACCESS */
|
|
struct {
|
|
__u64 rip;
|
|
__u32 is_write;
|
|
__u32 pad;
|
|
} tpr_access;
|
|
|
|
To be documented (KVM_TPR_ACCESS_REPORTING).
|
|
|
|
/* KVM_EXIT_S390_SIEIC */
|
|
struct {
|
|
__u8 icptcode;
|
|
__u64 mask; /* psw upper half */
|
|
__u64 addr; /* psw lower half */
|
|
__u16 ipa;
|
|
__u32 ipb;
|
|
} s390_sieic;
|
|
|
|
s390 specific.
|
|
|
|
/* KVM_EXIT_S390_RESET */
|
|
#define KVM_S390_RESET_POR 1
|
|
#define KVM_S390_RESET_CLEAR 2
|
|
#define KVM_S390_RESET_SUBSYSTEM 4
|
|
#define KVM_S390_RESET_CPU_INIT 8
|
|
#define KVM_S390_RESET_IPL 16
|
|
__u64 s390_reset_flags;
|
|
|
|
s390 specific.
|
|
|
|
/* KVM_EXIT_DCR */
|
|
struct {
|
|
__u32 dcrn;
|
|
__u32 data;
|
|
__u8 is_write;
|
|
} dcr;
|
|
|
|
powerpc specific.
|
|
|
|
/* KVM_EXIT_OSI */
|
|
struct {
|
|
__u64 gprs[32];
|
|
} osi;
|
|
|
|
MOL uses a special hypercall interface it calls 'OSI'. To enable it, we catch
|
|
hypercalls and exit with this exit struct that contains all the guest gprs.
|
|
|
|
If exit_reason is KVM_EXIT_OSI, then the vcpu has triggered such a hypercall.
|
|
Userspace can now handle the hypercall and when it's done modify the gprs as
|
|
necessary. Upon guest entry all guest GPRs will then be replaced by the values
|
|
in this struct.
|
|
|
|
/* Fix the size of the union. */
|
|
char padding[256];
|
|
};
|
|
};
|