diff options
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 27 | ||||
| -rw-r--r-- | Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 30 | ||||
| -rw-r--r-- | Documentation/virtual/kvm/mmu.txt | 6 | ||||
| -rw-r--r-- | Documentation/virtual/kvm/nested-vmx.txt | 11 |
4 files changed, 52 insertions, 22 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 758bf403a169..d10944e619d3 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -1269,12 +1269,18 @@ struct kvm_cpuid_entry2 { __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). +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 @@ -4603,3 +4609,12 @@ Architectures: s390 This capability indicates that kvm will implement the interfaces to handle reset, migration and nested KVM for branch prediction blocking. The stfle facility 82 should not be provided to the guest without this capability. + +8.18 KVM_CAP_HYPERV_TLBFLUSH + +Architectures: x86 + +This capability indicates that KVM supports paravirtualized Hyper-V TLB Flush +hypercalls: +HvFlushVirtualAddressSpace, HvFlushVirtualAddressSpaceEx, +HvFlushVirtualAddressList, HvFlushVirtualAddressListEx. diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt index 9293b45abdb9..2408ab720ef7 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt @@ -27,16 +27,42 @@ Groups: VCPU and all of the redistributor pages are contiguous. Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. This address needs to be 64K aligned. + + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION (rw, 64-bit) + The attribute data pointed to by kvm_device_attr.addr is a __u64 value: + bits: | 63 .... 52 | 51 .... 16 | 15 - 12 |11 - 0 + values: | count | base | flags | index + - index encodes the unique redistributor region index + - flags: reserved for future use, currently 0 + - base field encodes bits [51:16] of the guest physical base address + of the first redistributor in the region. + - count encodes the number of redistributors in the region. Must be + greater than 0. + There are two 64K pages for each redistributor in the region and + redistributors are laid out contiguously within the region. Regions + are filled with redistributors in the index order. The sum of all + region count fields must be greater than or equal to the number of + VCPUs. Redistributor regions must be registered in the incremental + index order, starting from index 0. + The characteristics of a specific redistributor region can be read + by presetting the index field in the attr data. + Only valid for KVM_DEV_TYPE_ARM_VGIC_V3. + + It is invalid to mix calls with KVM_VGIC_V3_ADDR_TYPE_REDIST and + KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION attributes. + Errors: -E2BIG: Address outside of addressable IPA range - -EINVAL: Incorrectly aligned address + -EINVAL: Incorrectly aligned address, bad redistributor region + count/index, mixed redistributor region attribute usage -EEXIST: Address already configured + -ENOENT: Attempt to read the characteristics of a non existing + redistributor region -ENXIO: The group or attribute is unknown/unsupported for this device or hardware support is missing. -EFAULT: Invalid user pointer for attr->addr. - KVM_DEV_ARM_VGIC_GRP_DIST_REGS KVM_DEV_ARM_VGIC_GRP_REDIST_REGS Attributes: diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt index f50d45b1e967..e507a9e0421e 100644 --- a/Documentation/virtual/kvm/mmu.txt +++ b/Documentation/virtual/kvm/mmu.txt @@ -49,8 +49,8 @@ The mmu supports first-generation mmu hardware, which allows an atomic switch of the current paging mode and cr3 during guest entry, as well as two-dimensional paging (AMD's NPT and Intel's EPT). The emulated hardware it exposes is the traditional 2/3/4 level x86 mmu, with support for global -pages, pae, pse, pse36, cr0.wp, and 1GB pages. Work is in progress to support -exposing NPT capable hardware on NPT capable hosts. +pages, pae, pse, pse36, cr0.wp, and 1GB pages. Emulated hardware also +able to expose NPT capable hardware on NPT capable hosts. Translation =========== @@ -465,5 +465,5 @@ Further reading =============== - NPT presentation from KVM Forum 2008 - http://www.linux-kvm.org/wiki/images/c/c8/KvmForum2008%24kdf2008_21.pdf + http://www.linux-kvm.org/images/c/c8/KvmForum2008%24kdf2008_21.pdf diff --git a/Documentation/virtual/kvm/nested-vmx.txt b/Documentation/virtual/kvm/nested-vmx.txt index 8ed937de1163..97eb1353e962 100644 --- a/Documentation/virtual/kvm/nested-vmx.txt +++ b/Documentation/virtual/kvm/nested-vmx.txt @@ -31,17 +31,6 @@ L0, the guest hypervisor, which we call L1, and its nested guest, which we call L2. -Known limitations ------------------ - -The current code supports running Linux guests under KVM guests. -Only 64-bit guest hypervisors are supported. - -Additional patches for running Windows under guest KVM, and Linux under -guest VMware server, and support for nested EPT, are currently running in -the lab, and will be sent as follow-on patchsets. - - Running nested VMX ------------------ |