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Commit 344dc46d authored by Nikita Ioffe's avatar Nikita Ioffe
Browse files

Add noop implementation of the IVmCapabilitiesService 

This implementation will be used in cuttlefish for mixed device testing.

Unfortunately, cuttlefish can't use the default implementation, since
it neither doesn't support pVMs not runs pkvm as hypervisor.

Additionally, this patch adds a simple VTS test to ensure that HAL was
setup correctly.

Bug: 360102915
Test: atest VtsVmCapabilitiesServiceTest
Test: presubmit
Test: manually add noop service to husky
Change-Id: I03ed5b10063ba942704ae5599435a2378a4df63d
parent dadf24a0

virtualization/capabilities_service/README.md

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The IVmCapabilitiesService HAL is used in a flow to grant a pVM a capability to

issue vendor-specific SMCs. For more information see: TODO(ioffe): link the docs



Here is a brief overview of the subdirectories structure:



* default/ - a reference implementation of the HAL that partners can integrate

    in their products.

* noop/ - a no-op implementation is used in cuttlefish for mixed build testing.

* vts/ - VTS tests for this HAL.

virtualization/capabilities_service/noop/Android.bp

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package {

    default_team: "trendy_team_virtualization",

    default_applicable_licenses: ["Android-Apache-2.0"],

}



rust_binary {

    name: "android.hardware.virtualization.capabilities.capabilities_service-noop",

    relative_install_path: "hw",

    vendor: true,

    installable: true,

    prefer_rlib: true,

    rustlibs: [

        "android.hardware.virtualization.capabilities.capabilities_service-V1-rust",

        "libanyhow",

        "libandroid_logger",

        "libbinder_rs",

        "liblog_rust",

    ],

    srcs: [

        "src/main.rs",

    ],

    init_rc: [

        "android.hardware.virtualization.capabilities.no_op_vm_capabilities_service.rc",

    ],

    vintf_fragment_modules: [

        "android.hardware.virtualization.capabilities.no_op_vm_capabilities_service.xml",

    ],

}



vintf_fragment {

    name: "android.hardware.virtualization.capabilities.no_op_vm_capabilities_service.xml",

    src: "android.hardware.virtualization.capabilities.no_op_vm_capabilities_service.xml",

    vendor: true,

}

virtualization/capabilities_service/noop/android.hardware.virtualization.capabilities.no_op_vm_capabilities_service.rc

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service vendor.vm_capabilities_service /vendor/bin/hw/android.hardware.virtualization.capabilities.capabilities_service-noop

  interface aidl android.hardware.virtualization.capabilities.IVmCapabilitiesService/noop

  class hal

  disabled

  user nobody

  group nobody

virtualization/capabilities_service/noop/android.hardware.virtualization.capabilities.no_op_vm_capabilities_service.xml

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<manifest version="1.0" type="device">

    <hal format="aidl">

        <name>android.hardware.virtualization.capabilities</name>

        <version>1</version>

        <interface>

            <name>IVmCapabilitiesService</name>

            <instance>noop</instance>

        </interface>

    </hal>

</manifest>

virtualization/capabilities_service/noop/src/aidl.rs

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/*

 * Copyright (C) 2025 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */



//! No-op implementation of the IVmCapabilitiesService AIDL interface.



use android_hardware_virtualization_capabilities_capabilities_service::aidl::android::hardware::virtualization::capabilities::IVmCapabilitiesService::IVmCapabilitiesService;

use binder::{Interface, ParcelFileDescriptor};

use log::info;



/// No-op implementation of IVmCapabilitiesService

pub struct NoOpVmCapabilitiesService {}



impl NoOpVmCapabilitiesService {

    pub fn init() -> NoOpVmCapabilitiesService {

        let service = NoOpVmCapabilitiesService {};

        service

    }

}



impl Interface for NoOpVmCapabilitiesService {}



impl IVmCapabilitiesService for NoOpVmCapabilitiesService {



    fn grantAccessToVendorTeeServices(&self,

        vm_fd: &ParcelFileDescriptor, tee_services: &[String]) -> binder::Result<()> {

        info!("received {vm_fd:?} {tee_services:?}");

        Ok(())

    }

}