virtcontainers: x86: Support microvm machine type

[ port from runtime commit 6aff077901021d9a0075c446dfe281b2487e1487 ]

With the addition of support to govmm for multiple transports (intel/govmm#111)
and microvm (intel/govmm#121) we can now enable support for the 'microvm'
machine type in kata-runtime.

Signed-off-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: Peng Tao <bergwolf@hyper.sh>

src/runtime/virtcontainers/qemu_amd64_test.go

@@ -47,6 +47,10 @@ func TestQemuAmd64Capabilities(t *testing.T) {
 	amd64 = newTestQemu(assert, QemuQ35)
 	caps = amd64.capabilities()
 	assert.True(caps.IsBlockDeviceHotplugSupported())
+
+	amd64 = newTestQemu(assert, QemuMicrovm)
+	caps = amd64.capabilities()
+	assert.False(caps.IsBlockDeviceHotplugSupported())
 }
 
 func TestQemuAmd64Bridges(t *testing.T) {
@@ -65,6 +69,11 @@ func TestQemuAmd64Bridges(t *testing.T) {
 		assert.NotNil(b.Devices)
 	}
 
+	amd64 = newTestQemu(assert, QemuMicrovm)
+	amd64.bridges(uint32(len))
+	bridges = amd64.getBridges()
+	assert.Nil(bridges)
+
 	amd64 = newTestQemu(assert, QemuQ35)
 	amd64.bridges(uint32(len))
 	bridges = amd64.getBridges()
@@ -256,3 +265,18 @@ func TestQemuAmd64Iommu(t *testing.T) {
 	m := qemu.machine()
 	assert.Contains(m.Options, "kernel_irqchip=split")
 }
+
+func TestQemuAmd64Microvm(t *testing.T) {
+	assert := assert.New(t)
+
+	cfg := qemuConfig(QemuMicrovm)
+	amd64, err := newQemuArch(cfg)
+	assert.NoError(err)
+	assert.False(cfg.DisableImageNvdimm)
+
+	for _, m := range supportedQemuMachines {
+		assert.NotContains(m.Options, qemuNvdimmOption)
+	}
+
+	assert.False(amd64.supportGuestMemoryHotplug())
+}