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qemu: add vhostfd and disable-modern to vhost-vsock-pci

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`vhostfd` is the vhost file descriptor that holds the socket context ID
`disable-modern` prevents qemu from relying on fast MMIO

Signed-off-by: Julio Montes <julio.montes@intel.com>
This commit is contained in:
Julio Montes
2018-07-24 13:37:28 -05:00
parent db7e149611
commit 3830b4419f
2 changed files with 27 additions and 7 deletions
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20
qemu/qemu.go
View File

@@ -965,6 +965,12 @@ type VSOCKDevice struct {
ID string
ContextID uint32
// VHostFD vhost file descriptor that holds the ContextID
VHostFD *os.File
// DisableModern prevents qemu from relying on fast MMIO.
DisableModern bool
}
const (
@@ -989,12 +995,22 @@ func (vsock VSOCKDevice) Valid() bool {
// QemuParams returns the qemu parameters built out of the VSOCK device.
func (vsock VSOCKDevice) QemuParams(config *Config) []string {
var deviceParams []string
var qemuParams []string
deviceParam := fmt.Sprintf("%s,id=%s,%s=%d", VhostVSOCKPCI, vsock.ID, VSOCKGuestCID, vsock.ContextID)
deviceParams = append(deviceParams, fmt.Sprintf("%s", VhostVSOCKPCI))
if vsock.DisableModern {
deviceParams = append(deviceParams, ",disable-modern=true")
}
if vsock.VHostFD != nil {
qemuFDs := config.appendFDs([]*os.File{vsock.VHostFD})
deviceParams = append(deviceParams, fmt.Sprintf(",vhostfd=%d", qemuFDs[0]))
}
deviceParams = append(deviceParams, fmt.Sprintf(",id=%s", vsock.ID))
deviceParams = append(deviceParams, fmt.Sprintf(",%s=%d", VSOCKGuestCID, vsock.ContextID))
qemuParams = append(qemuParams, "-device")
qemuParams = append(qemuParams, deviceParam)
qemuParams = append(qemuParams, strings.Join(deviceParams, ""))
return qemuParams
}

6
qemu/qemu_test.go
View File

@@ -329,12 +329,14 @@ func TestAppendDeviceVFIO(t *testing.T) {
testAppend(vfioDevice, deviceVFIOString, t)
}
var deviceVSOCKString = "-device vhost-vsock-pci,id=vhost-vsock-pci0,guest-cid=4"
var deviceVSOCKString = "-device vhost-vsock-pci,disable-modern=true,id=vhost-vsock-pci0,guest-cid=4"
func TestAppendVSOCK(t *testing.T) {
vsockDevice := VSOCKDevice{
ID: "vhost-vsock-pci0",
ContextID: 4,
VHostFD: nil,
DisableModern: true,
}
testAppend(vsockDevice, deviceVSOCKString, t)
@@ -344,6 +346,8 @@ func TestVSOCKValid(t *testing.T) {
vsockDevice := VSOCKDevice{
ID: "vhost-vsock-pci0",
ContextID: MinimalGuestCID - 1,
VHostFD: nil,
DisableModern: true,
}
if vsockDevice.Valid() {