1 // Copyright 2023, The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 //! Error and Result types for hypervisor. 16 17 use core::{fmt, result}; 18 19 use super::hypervisor::{GeniezoneError, KvmError}; 20 use uuid::Uuid; 21 22 /// Result type with hypervisor error. 23 pub type Result<T> = result::Result<T, Error>; 24 25 /// Hypervisor error. 26 #[derive(Debug, Clone)] 27 pub enum Error { 28 /// MMIO guard is not supported. 29 MmioGuardNotSupported, 30 /// Failed to invoke a certain KVM HVC function. 31 KvmError(KvmError, u32), 32 /// Failed to invoke GenieZone HVC function. 33 GeniezoneError(GeniezoneError, u32), 34 /// Unsupported Hypervisor 35 UnsupportedHypervisorUuid(Uuid), 36 } 37 38 impl fmt::Display for Error { fmt(&self, f: &mut fmt::Formatter) -> fmt::Result39 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { 40 match self { 41 Self::MmioGuardNotSupported => write!(f, "MMIO guard is not supported"), 42 Self::KvmError(e, function_id) => { 43 write!(f, "Failed to invoke the HVC function with function ID {function_id}: {e}") 44 } 45 Self::GeniezoneError(e, function_id) => { 46 write!( 47 f, 48 "Failed to invoke GenieZone HVC function with function ID {function_id}: {e}" 49 ) 50 } 51 Self::UnsupportedHypervisorUuid(u) => { 52 write!(f, "Unsupported Hypervisor UUID {u}") 53 } 54 } 55 } 56 } 57