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virtcontainers: Don't create vfio devices in the guest

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vfio devices hotplugged in the VM are expected to be handled by the kernel
driver in the guest, hence the char vfio devices shouldn't appear in the
container under /dev/vfio/.

fixes #2539

Signed-off-by: Julio Montes <julio.montes@intel.com>
This commit is contained in:
Julio Montes 2020-03-23 19:53:42 +00:00
parent 078da1a6de
commit 4d2574a723
3 changed files with 30 additions and 3 deletions
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15
virtcontainers/kata_agent.go
View File

@ -51,6 +51,9 @@ const (
// KataLocalDevType creates a local directory inside the VM for sharing files between
// containers.
KataLocalDevType = "local"
// path to vfio devices
vfioPath = "/dev/vfio/"
)
var (
@ -1067,6 +1070,18 @@ func (k *kataAgent) constraintGRPCSpec(grpcSpec *grpc.Spec, passSeccomp bool) {
}
}
grpcSpec.Linux.Namespaces = tmpNamespaces
// VFIO char device shouldn't not appear in the guest,
// the device driver should handle it and determinate its group.
var linuxDevices []grpc.LinuxDevice
for _, dev := range grpcSpec.Linux.Devices {
if dev.Type == "c" && strings.HasPrefix(dev.Path, vfioPath) {
k.Logger().WithField("vfio-dev", dev.Path).Debug("removing vfio device from grpcSpec")
continue
}
linuxDevices = append(linuxDevices, dev)
}
grpcSpec.Linux.Devices = linuxDevices
}
func (k *kataAgent) handleShm(grpcSpec *grpc.Spec, sandbox *Sandbox) {

16
virtcontainers/kata_agent_test.go
View File

@ -9,7 +9,6 @@ import (
"bufio"
"context"
"fmt"
vcAnnotations "github.com/kata-containers/runtime/virtcontainers/pkg/annotations"
"io/ioutil"
"net"
"os"
@ -20,6 +19,8 @@ import (
"syscall"
"testing"
vcAnnotations "github.com/kata-containers/runtime/virtcontainers/pkg/annotations"
gpb "github.com/gogo/protobuf/types"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/stretchr/testify/assert"
@ -611,6 +612,16 @@ func TestConstraintGRPCSpec(t *testing.T) {
Network: &pb.LinuxNetwork{},
},
CgroupsPath: "system.slice:foo:bar",
Devices: []pb.LinuxDevice{
{
Path: "/dev/vfio/1",
Type: "c",
},
{
Path: "/dev/vfio/2",
Type: "c",
},
},
},
Process: &pb.Process{
SelinuxLabel: "foo",
@ -641,6 +652,9 @@ func TestConstraintGRPCSpec(t *testing.T) {
// check cgroup path
assert.Equal(expectedCgroupPath, g.Linux.CgroupsPath)
// check Linux devices
assert.Empty(g.Linux.Devices)
}
func TestHandleShm(t *testing.T) {

2
virtcontainers/sandbox_test.go
View File

@ -675,8 +675,6 @@ func TestContainerStateSetFstype(t *testing.T) {
assert.Equal(cImpl.state.Fstype, newFstype)
}
const vfioPath = "/dev/vfio/"
func TestSandboxAttachDevicesVFIO(t *testing.T) {
tmpDir, err := ioutil.TempDir("", "")
assert.Nil(t, err)