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| -rw-r--r-- | Documentation/virt/kvm/api.rst | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 57061fa29e6a..27f726ff8fe0 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -7286,6 +7286,41 @@ exit, even without calls to ``KVM_ENABLE_CAP`` or similar. In this case, it will enter with output fields already valid; in the common case, the ``unknown.ret`` field of the union will be ``TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED``. Userspace need not do anything if it does not wish to support a TDVMCALL. + +:: + + /* KVM_EXIT_ARM_SEA */ + struct { + #define KVM_EXIT_ARM_SEA_FLAG_GPA_VALID (1ULL << 0) + __u64 flags; + __u64 esr; + __u64 gva; + __u64 gpa; + } arm_sea; + +Used on arm64 systems. When the VM capability ``KVM_CAP_ARM_SEA_TO_USER`` is +enabled, a KVM exits to userspace if a guest access causes a synchronous +external abort (SEA) and the host APEI fails to handle the SEA. + +``esr`` is set to a sanitized value of ESR_EL2 from the exception taken to KVM, +consisting of the following fields: + + - ``ESR_EL2.EC`` + - ``ESR_EL2.IL`` + - ``ESR_EL2.FnV`` + - ``ESR_EL2.EA`` + - ``ESR_EL2.CM`` + - ``ESR_EL2.WNR`` + - ``ESR_EL2.FSC`` + - ``ESR_EL2.SET`` (when FEAT_RAS is implemented for the VM) + +``gva`` is set to the value of FAR_EL2 from the exception taken to KVM when +``ESR_EL2.FnV == 0``. Otherwise, the value of ``gva`` is unknown. + +``gpa`` is set to the faulting IPA from the exception taken to KVM when +the ``KVM_EXIT_ARM_SEA_FLAG_GPA_VALID`` flag is set. Otherwise, the value of +``gpa`` is unknown. + :: /* Fix the size of the union. */ @@ -8703,6 +8738,18 @@ This capability indicate to the userspace whether a PFNMAP memory region can be safely mapped as cacheable. This relies on the presence of force write back (FWB) feature support on the hardware. +7.45 KVM_CAP_ARM_SEA_TO_USER +---------------------------- + +:Architecture: arm64 +:Target: VM +:Parameters: none +:Returns: 0 on success, -EINVAL if unsupported. + +When this capability is enabled, KVM may exit to userspace for SEAs taken to +EL2 resulting from a guest access. See ``KVM_EXIT_ARM_SEA`` for more +information. + 8. Other capabilities. ====================== |