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Diffstat (limited to 'Documentation/virt/kvm/api.rst')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 249 |
1 files changed, 231 insertions, 18 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index c136e254b496..45fd862ac128 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -360,10 +360,9 @@ since the last call to this ioctl. Bit 0 is the first page in the memory slot. Ensure the entire structure is cleared to avoid padding issues. -If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 specifies -the address space for which you want to return the dirty bitmap. -They must be less than the value that KVM_CHECK_EXTENSION returns for -the KVM_CAP_MULTI_ADDRESS_SPACE capability. +If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 of slot field specifies +the address space for which you want to return the dirty bitmap. See +KVM_SET_USER_MEMORY_REGION for details on the usage of slot field. The bits in the dirty bitmap are cleared before the ioctl returns, unless KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 is enabled. For more information, @@ -961,6 +960,14 @@ memory. __u8 pad2[30]; }; +If the KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL flag is returned from the +KVM_CAP_XEN_HVM check, it may be set in the flags field of this ioctl. +This requests KVM to generate the contents of the hypercall page +automatically; hypercalls will be intercepted and passed to userspace +through KVM_EXIT_XEN. In this case, all of the blob size and address +fields must be zero. + +No other flags are currently valid in the struct kvm_xen_hvm_config. 4.29 KVM_GET_CLOCK ------------------ @@ -1281,6 +1288,9 @@ 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. @@ -1333,7 +1343,7 @@ documentation when it pops into existence). :Capability: KVM_CAP_ENABLE_CAP_VM :Architectures: all -:Type: vcpu ioctl +:Type: vm ioctl :Parameters: struct kvm_enable_cap (in) :Returns: 0 on success; -1 on error @@ -2266,6 +2276,8 @@ registers, find a list below: PPC KVM_REG_PPC_PSSCR 64 PPC KVM_REG_PPC_DEC_EXPIRY 64 PPC KVM_REG_PPC_PTCR 64 + PPC KVM_REG_PPC_DAWR1 64 + PPC KVM_REG_PPC_DAWRX1 64 PPC KVM_REG_PPC_TM_GPR0 64 ... PPC KVM_REG_PPC_TM_GPR31 64 @@ -4432,7 +4444,7 @@ to I/O ports. :Capability: KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 :Architectures: x86, arm, arm64, mips :Type: vm ioctl -:Parameters: struct kvm_dirty_log (in) +:Parameters: struct kvm_clear_dirty_log (in) :Returns: 0 on success, -1 on error :: @@ -4459,10 +4471,9 @@ in KVM's dirty bitmap, and dirty tracking is re-enabled for that page (for example via write-protection, or by clearing the dirty bit in a page table entry). -If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 specifies -the address space for which you want to return the dirty bitmap. -They must be less than the value that KVM_CHECK_EXTENSION returns for -the KVM_CAP_MULTI_ADDRESS_SPACE capability. +If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 of slot field specifies +the address space for which you want to clear the dirty status. See +KVM_SET_USER_MEMORY_REGION for details on the usage of slot field. This ioctl is mostly useful when KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 is enabled; for more information, see the description of the capability. @@ -4830,6 +4841,101 @@ into user space. If a vCPU is in running state while this ioctl is invoked, the vCPU may experience inconsistent filtering behavior on MSR accesses. +4.127 KVM_XEN_HVM_SET_ATTR +-------------------------- + +:Capability: KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_xen_hvm_attr +:Returns: 0 on success, < 0 on error + +:: + + struct kvm_xen_hvm_attr { + __u16 type; + __u16 pad[3]; + union { + __u8 long_mode; + __u8 vector; + struct { + __u64 gfn; + } shared_info; + __u64 pad[4]; + } u; + }; + +type values: + +KVM_XEN_ATTR_TYPE_LONG_MODE + Sets the ABI mode of the VM to 32-bit or 64-bit (long mode). This + determines the layout of the shared info pages exposed to the VM. + +KVM_XEN_ATTR_TYPE_SHARED_INFO + Sets the guest physical frame number at which the Xen "shared info" + page resides. Note that although Xen places vcpu_info for the first + 32 vCPUs in the shared_info page, KVM does not automatically do so + and instead requires that KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO be used + explicitly even when the vcpu_info for a given vCPU resides at the + "default" location in the shared_info page. This is because KVM is + not aware of the Xen CPU id which is used as the index into the + vcpu_info[] array, so cannot know the correct default location. + +KVM_XEN_ATTR_TYPE_UPCALL_VECTOR + Sets the exception vector used to deliver Xen event channel upcalls. + +4.128 KVM_XEN_HVM_GET_ATTR +-------------------------- + +:Capability: KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_xen_hvm_attr +:Returns: 0 on success, < 0 on error + +Allows Xen VM attributes to be read. For the structure and types, +see KVM_XEN_HVM_SET_ATTR above. + +4.129 KVM_XEN_VCPU_SET_ATTR +--------------------------- + +:Capability: KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_xen_vcpu_attr +:Returns: 0 on success, < 0 on error + +:: + + struct kvm_xen_vcpu_attr { + __u16 type; + __u16 pad[3]; + union { + __u64 gpa; + __u64 pad[4]; + } u; + }; + +type values: + +KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO + Sets the guest physical address of the vcpu_info for a given vCPU. + +KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO + Sets the guest physical address of an additional pvclock structure + for a given vCPU. This is typically used for guest vsyscall support. + +4.130 KVM_XEN_VCPU_GET_ATTR +--------------------------- + +:Capability: KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_xen_vcpu_attr +:Returns: 0 on success, < 0 on error + +Allows Xen vCPU attributes to be read. For the structure and types, +see KVM_XEN_VCPU_SET_ATTR above. 5. The kvm_run structure ======================== @@ -4892,9 +4998,11 @@ local APIC is not used. __u16 flags; More architecture-specific flags detailing state of the VCPU that may -affect the device's behavior. The only currently defined flag is -KVM_RUN_X86_SMM, which is valid on x86 machines and is set if the -VCPU is in system management mode. +affect the device's behavior. Current defined flags: + /* x86, set if the VCPU is in system management mode */ + #define KVM_RUN_X86_SMM (1 << 0) + /* x86, set if bus lock detected in VM */ + #define KVM_RUN_BUS_LOCK (1 << 1) :: @@ -4995,13 +5103,18 @@ to the byte array. .. note:: - For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR, + For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR, KVM_EXIT_XEN, KVM_EXIT_EPR, KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR 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. + incomplete operations and then check for pending signals. + + The pending state of the operation is not preserved in state which is + visible to userspace, thus userspace should ensure that the operation is + completed before performing a live migration. Userspace can re-enter the + guest with an unmasked signal pending or with the immediate_exit field set + to complete pending operations without allowing any further instructions + to be executed. :: @@ -5328,6 +5441,34 @@ vCPU execution. If the MSR write was unsuccessful, user space also sets the :: + + struct kvm_xen_exit { + #define KVM_EXIT_XEN_HCALL 1 + __u32 type; + union { + struct { + __u32 longmode; + __u32 cpl; + __u64 input; + __u64 result; + __u64 params[6]; + } hcall; + } u; + }; + /* KVM_EXIT_XEN */ + struct kvm_hyperv_exit xen; + +Indicates that the VCPU exits into userspace to process some tasks +related to Xen emulation. + +Valid values for 'type' are: + + - KVM_EXIT_XEN_HCALL -- synchronously notify user-space about Xen hypercall. + Userspace is expected to place the hypercall result into the appropriate + field before invoking KVM_RUN again. + +:: + /* Fix the size of the union. */ char padding[256]; }; @@ -6037,6 +6178,53 @@ KVM_EXIT_X86_RDMSR and KVM_EXIT_X86_WRMSR exit notifications which user space can then handle to implement model specific MSR handling and/or user notifications to inform a user that an MSR was not handled. +7.22 KVM_CAP_X86_BUS_LOCK_EXIT +------------------------------- + +:Architectures: x86 +:Target: VM +:Parameters: args[0] defines the policy used when bus locks detected in guest +:Returns: 0 on success, -EINVAL when args[0] contains invalid bits + +Valid bits in args[0] are:: + + #define KVM_BUS_LOCK_DETECTION_OFF (1 << 0) + #define KVM_BUS_LOCK_DETECTION_EXIT (1 << 1) + +Enabling this capability on a VM provides userspace with a way to select +a policy to handle the bus locks detected in guest. Userspace can obtain +the supported modes from the result of KVM_CHECK_EXTENSION and define it +through the KVM_ENABLE_CAP. + +KVM_BUS_LOCK_DETECTION_OFF and KVM_BUS_LOCK_DETECTION_EXIT are supported +currently and mutually exclusive with each other. More bits can be added in +the future. + +With KVM_BUS_LOCK_DETECTION_OFF set, bus locks in guest will not cause vm exits +so that no additional actions are needed. This is the default mode. + +With KVM_BUS_LOCK_DETECTION_EXIT set, vm exits happen when bus lock detected +in VM. KVM just exits to userspace when handling them. Userspace can enforce +its own throttling or other policy based mitigations. + +This capability is aimed to address the thread that VM can exploit bus locks to +degree the performance of the whole system. Once the userspace enable this +capability and select the KVM_BUS_LOCK_DETECTION_EXIT mode, KVM will set the +KVM_RUN_BUS_LOCK flag in vcpu-run->flags field and exit to userspace. Concerning +the bus lock vm exit can be preempted by a higher priority VM exit, the exit +notifications to userspace can be KVM_EXIT_BUS_LOCK or other reasons. +KVM_RUN_BUS_LOCK flag is used to distinguish between them. + +7.22 KVM_CAP_PPC_DAWR1 +---------------------- + +:Architectures: ppc +:Parameters: none +:Returns: 0 on success, -EINVAL when CPU doesn't support 2nd DAWR + +This capability can be used to check / enable 2nd DAWR feature provided +by POWER10 processor. + 8. Other capabilities. ====================== @@ -6414,7 +6602,6 @@ guest according to the bits in the KVM_CPUID_FEATURES CPUID leaf (0x40000001). Otherwise, a guest may use the paravirtual features regardless of what has actually been exposed through the CPUID leaf. - 8.29 KVM_CAP_DIRTY_LOG_RING --------------------------- @@ -6501,3 +6688,29 @@ KVM_GET_DIRTY_LOG and KVM_CLEAR_DIRTY_LOG. After enabling KVM_CAP_DIRTY_LOG_RING with an acceptable dirty ring size, the virtual machine will switch to ring-buffer dirty page tracking and further KVM_GET_DIRTY_LOG or KVM_CLEAR_DIRTY_LOG ioctls will fail. + +8.30 KVM_CAP_XEN_HVM +-------------------- + +:Architectures: x86 + +This capability indicates the features that Xen supports for hosting Xen +PVHVM guests. Valid flags are:: + + #define KVM_XEN_HVM_CONFIG_HYPERCALL_MSR (1 << 0) + #define KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL (1 << 1) + #define KVM_XEN_HVM_CONFIG_SHARED_INFO (1 << 2) + +The KVM_XEN_HVM_CONFIG_HYPERCALL_MSR flag indicates that the KVM_XEN_HVM_CONFIG +ioctl is available, for the guest to set its hypercall page. + +If KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL is also set, the same flag may also be +provided in the flags to KVM_XEN_HVM_CONFIG, without providing hypercall page +contents, to request that KVM generate hypercall page content automatically +and also enable interception of guest hypercalls with KVM_EXIT_XEN. + +The KVM_XEN_HVM_CONFIG_SHARED_INFO flag indicates the availability of the +KVM_XEN_HVM_SET_ATTR, KVM_XEN_HVM_GET_ATTR, KVM_XEN_VCPU_SET_ATTR and +KVM_XEN_VCPU_GET_ATTR ioctls, as well as the delivery of exception vectors +for event channel upcalls when the evtchn_upcall_pending field of a vcpu's +vcpu_info is set. |