mirror of
https://github.com/kata-containers/kata-containers.git
synced 2025-10-20 19:38:40 +00:00
e84a9a70b0
- Add kata-runtime - Add unit test - Add Makefile to build cli Fixes: #33 Signed-off-by: Julio Montes <julio.montes@intel.com> Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com> Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>
133 lines
3.3 KiB
Go
133 lines
3.3 KiB
Go
// Copyright (c) 2018 Intel Corporation
|
|
//
|
|
// 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.
|
|
|
|
package main
|
|
|
|
/*
|
|
#include <linux/kvm.h>
|
|
|
|
const int ioctl_KVM_CREATE_VM = KVM_CREATE_VM;
|
|
*/
|
|
import "C"
|
|
|
|
import (
|
|
"syscall"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// variables rather than consts to allow tests to modify them
|
|
var (
|
|
kvmDevice = "/dev/kvm"
|
|
)
|
|
|
|
// archRequiredCPUFlags maps a CPU flag value to search for and a
|
|
// human-readable description of that value.
|
|
var archRequiredCPUFlags = map[string]string{
|
|
"vmx": "Virtualization support",
|
|
"lm": "64Bit CPU",
|
|
"sse4_1": "SSE4.1",
|
|
}
|
|
|
|
// archRequiredCPUAttribs maps a CPU (non-CPU flag) attribute value to search for
|
|
// and a human-readable description of that value.
|
|
var archRequiredCPUAttribs = map[string]string{
|
|
"GenuineIntel": "Intel Architecture CPU",
|
|
}
|
|
|
|
// archRequiredKernelModules maps a required module name to a human-readable
|
|
// description of the modules functionality and an optional list of
|
|
// required module parameters.
|
|
var archRequiredKernelModules = map[string]kernelModule{
|
|
"kvm": {
|
|
desc: "Kernel-based Virtual Machine",
|
|
},
|
|
"kvm_intel": {
|
|
desc: "Intel KVM",
|
|
parameters: map[string]string{
|
|
"nested": "Y",
|
|
// "VMX Unrestricted mode support". This is used
|
|
// as a heuristic to determine if the system is
|
|
// "new enough" to run a Kata Container
|
|
// (atleast a Westmere).
|
|
"unrestricted_guest": "Y",
|
|
},
|
|
},
|
|
"vhost": {
|
|
desc: "Host kernel accelerator for virtio",
|
|
},
|
|
"vhost_net": {
|
|
desc: "Host kernel accelerator for virtio network",
|
|
},
|
|
}
|
|
|
|
// kvmIsUsable determines if it will be possible to create a full virtual machine
|
|
// by creating a minimal VM and then deleting it.
|
|
func kvmIsUsable() error {
|
|
flags := syscall.O_RDWR | syscall.O_CLOEXEC
|
|
|
|
f, err := syscall.Open(kvmDevice, flags, 0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer syscall.Close(f)
|
|
|
|
fieldLogger := kataLog.WithField("check-type", "full")
|
|
|
|
fieldLogger.WithField("device", kvmDevice).Info("device available")
|
|
|
|
vm, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
|
|
uintptr(f),
|
|
uintptr(C.ioctl_KVM_CREATE_VM),
|
|
0)
|
|
if errno != 0 {
|
|
if errno == syscall.EBUSY {
|
|
fieldLogger.WithField("reason", "another hypervisor running").Error("cannot create VM")
|
|
}
|
|
|
|
return errno
|
|
}
|
|
defer syscall.Close(int(vm))
|
|
|
|
fieldLogger.WithField("feature", "create-vm").Info("feature available")
|
|
|
|
return nil
|
|
}
|
|
|
|
func archHostCanCreateVMContainer() error {
|
|
return kvmIsUsable()
|
|
}
|
|
|
|
func archKernelParamHandler(onVMM bool, fields logrus.Fields, msg string) bool {
|
|
param, ok := fields["parameter"].(string)
|
|
if !ok {
|
|
return false
|
|
}
|
|
|
|
// This option is not required when
|
|
// already running under a hypervisor.
|
|
if param == "unrestricted_guest" && onVMM {
|
|
kataLog.WithFields(fields).Warn(kernelPropertyCorrect)
|
|
return true
|
|
}
|
|
|
|
if param == "nested" {
|
|
kataLog.WithFields(fields).Warn(msg)
|
|
return true
|
|
}
|
|
|
|
// don't ignore the error
|
|
return false
|
|
}
|