runtime: add appendBridges for arm64

since generic func genericAppendBridges and genericBridges
is also applied for machine type QemuVirt, we use it as implementation
for appendBridges and bridges on aarch64.
since const defaultPCBridgeBus is used in generic func
genericAppendBridges for pc machine, we should define it once
in generic file, instead of redefining it in different
arch-specific files.

Fixes: #1200

Signed-off-by: Penny Zheng <penny.zheng@arm.com>

virtcontainers/qemu_amd64.go

@@ -24,8 +24,6 @@ const defaultQemuMachineType = QemuPC
 
 const defaultQemuMachineOptions = "accel=kvm,kernel_irqchip,nvdimm"
 
-const defaultPCBridgeBus = "pci.0"
-
 var qemuPaths = map[string]string{
 	QemuPCLite: "/usr/bin/qemu-lite-system-x86_64",
 	QemuPC:     defaultQemuPath,

virtcontainers/qemu_arch_base.go

@@ -116,12 +116,13 @@ type qemuArchBase struct {
 }
 
 const (
-	defaultCores     uint32 = 1
-	defaultThreads   uint32 = 1
-	defaultCPUModel         = "host"
-	defaultBridgeBus        = "pcie.0"
-	maxDevIDSize            = 31
-	defaultMsize9p          = 8192
+	defaultCores       uint32 = 1
+	defaultThreads     uint32 = 1
+	defaultCPUModel           = "host"
+	defaultBridgeBus          = "pcie.0"
+	defaultPCBridgeBus        = "pci.0"
+	maxDevIDSize              = 31
+	defaultMsize9p            = 8192
 )
 
 // This is the PCI start address assigned to the first bridge that

virtcontainers/qemu_arm64.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	govmmQemu "github.com/intel/govmm/qemu"
+	"github.com/kata-containers/runtime/virtcontainers/types"
 	"github.com/sirupsen/logrus"
 )
 
@@ -25,9 +26,6 @@ const defaultQemuMachineType = QemuVirt
 
 var defaultQemuMachineOptions = "usb=off,accel=kvm,gic-version=" + getGuestGICVersion()
 
-// Not used
-const defaultPCBridgeBus = ""
-
 var qemuPaths = map[string]string{
 	QemuVirt: defaultQemuPath,
 }
@@ -153,3 +151,12 @@ func newQemuArch(config HypervisorConfig) qemuArch {
 
 	return q
 }
+
+func (q *qemuArm64) bridges(number uint32) []types.PCIBridge {
+	return genericBridges(number, q.machineType)
+}
+
+// appendBridges appends to devices the given bridges
+func (q *qemuArm64) appendBridges(devices []govmmQemu.Device, bridges []types.PCIBridge) []govmmQemu.Device {
+	return genericAppendBridges(devices, bridges, q.machineType)
+}

virtcontainers/qemu_arm64_test.go

@@ -98,3 +98,30 @@ func TestMaxQemuVCPUs(t *testing.T) {
 		assert.Equal(d.expectedResult, vCPUs)
 	}
 }
+
+func TestQemuArm64AppendBridges(t *testing.T) {
+	var devices []govmmQemu.Device
+	assert := assert.New(t)
+
+	arm64 := newTestQemu(QemuVirt)
+
+	bridges := arm64.bridges(1)
+	assert.Len(bridges, 1)
+
+	devices = []govmmQemu.Device{}
+	devices = arm64.appendBridges(devices, bridges)
+	assert.Len(devices, 1)
+
+	expectedOut := []govmmQemu.Device{
+		govmmQemu.BridgeDevice{
+			Type:    govmmQemu.PCIEBridge,
+			Bus:     defaultBridgeBus,
+			ID:      bridges[0].ID,
+			Chassis: 1,
+			SHPC:    true,
+			Addr:    "2",
+		},
+	}
+
+	assert.Equal(expectedOut, devices)
+}

virtcontainers/qemu_ppc64le.go

@@ -27,8 +27,6 @@ const defaultQemuMachineType = QemuPseries
 
 const defaultQemuMachineOptions = "accel=kvm,usb=off"
 
-const defaultPCBridgeBus = "pci.0"
-
 const defaultMemMaxPPC64le = 32256 // Restrict MemMax to 32Gb on PPC64le
 
 var qemuPaths = map[string]string{

virtcontainers/qemu_s390x.go

@@ -23,8 +23,6 @@ const defaultQemuMachineType = QemuCCWVirtio
 
 const defaultQemuMachineOptions = "accel=kvm"
 
-const defaultPCBridgeBus = "pci.0"
-
 const VirtioSerialCCW = "virtio-serial-ccw"
 
 var qemuPaths = map[string]string{