Add Blutooth Hci interface down option

Everytime before launching android user has to manually
do "sudo hciconfig hci0 down" when BT Card is passthrough.

Added 'bluetooth' section with 'hci_down' flag in the vm-manager.
If set to 'true', will bring down the BT hci interface.

Tests done:
1. Build vm-manager binary
2. Add BT USB Pci address in the [passthrough]
3. Add hci_down=true in [bluetooth]
4. Launch Android and check BT on success
5. Validated on RPL NUC with AX211

Tracked-On: OAM-116593
Signed-off-by: Gowtham Anandha Babu <gowtham.anandha.babu@intel.com>
Signed-off-by: Aman Bhadouria <aman.bhadouria@intel.com>

docs/fields.md

@@ -169,3 +169,6 @@ Requirements
 - cmd: Set extra command.
 - service: Set extra services, use `:` split different services.
 - pwr_ctrl_multios: If set to "true", will create qmp socket in /tmp/ folder for suspend/hibernate feature. Setting to "false" will not create the sockeet.
+
+### [bluetooth]
+- hci_down: If set to 'true', will bring down Bluetooth Hci Interface. Make sure BT USB Pci address is added in `[passthrough]`.

src/guest/config_parser.cc

@@ -41,6 +41,7 @@ map<string_view, vector<string_view>> kConfigMap = {
     { kGroupRpmb,    { kRpmbBinPath, kRpmbDataDir } },
     { kGroupAaf,     { kAafPath, kAafSuspend, kAafAudioType }},
     { kGroupPciPt,   { kPciPtDev }},
+    { kGroupbluetooth, { kHciDown }},
     { kGroupAudio,   { kDisableEmul } },
     { kGroupMed,     { kMedBattery, kMedThermal, kMedCamera } },
     { kGroupService, { kServTimeKeep, kServPmCtrl, kServVinput } },

src/guest/config_parser.h

@@ -28,6 +28,7 @@ constexpr char kGroupVtpm[]    = "vtpm";
 constexpr char kGroupRpmb[]    = "rpmb";
 constexpr char kGroupAaf[]     = "aaf";
 constexpr char kGroupPciPt[]   = "passthrough";
+constexpr char kGroupbluetooth[] = "bluetooth";
 constexpr char kGroupAudio[]   = "audio";
 constexpr char kGroupMed[]     = "mediation";
 constexpr char kGroupService[] = "guest_control";
@@ -78,6 +79,8 @@ constexpr char kAafAudioType[] = "audio_type";
 
 constexpr char kPciPtDev[] = "passthrough_pci";
 
+constexpr char kHciDown[] = "hci_down";
+
 constexpr char kDisableEmul[] = "disable_emulation";
 
 constexpr char kMedBattery[] = "battery_med";

src/guest/vm_builder_qemu.cc

@@ -300,6 +300,18 @@ bool VmBuilderQemu::SetupSriov(void) {
     return true;
 }
 
+void VmBuilderQemu::BringDownBtHciIntf() {
+    std::string hci_status = cfg_.GetValue(kGroupbluetooth, kHciDown);
+    boost::trim(hci_status);
+    if (hci_status == "true") {
+        LOG(info) << "Shutting down Hci Interface!!!\n";
+        int result = boost::process::system("sudo hciconfig hci0 down");
+        if (result != 0) {
+            LOG(warning) << "Failed to execute command: sudo hciconfig hci0 down";
+        }
+    }
+}
+
 void VmBuilderQemu::BuildExtraGuestPmCtrlCmd(void) {
     std::string ex_cmd = cfg_.GetValue(kGroupExtra, kExtraPwrCtrlMultiOS);
     if (ex_cmd == "true") {
@@ -413,6 +425,7 @@ void VmBuilderQemu::BuildPtPciDevicesCmd(void) {
     std::vector<std::string> vec;
     boost::split(vec, pt_pci, boost::is_any_of(","), boost::token_compress_on);
 
+    BringDownBtHciIntf();  // Bring down blutooth hci interface before passthrough
     for (auto it=vec.begin(); it != vec.end(); ++it) {
         boost::trim(*it);
         if (PassthroughOnePciDev(it->c_str(), kPciPassthrough)) {

src/guest/vm_builder_qemu.h

@@ -57,6 +57,7 @@ class VmBuilderQemu : public VmBuilder {
     void BuildVcpuCmd(void);
     bool BuildFirmwareCmd(void);
     void BuildVdiskCmd(void);
+    void BringDownBtHciIntf();
     void BuildPtPciDevicesCmd(void);
     void BuildGuestTimeKeepCmd(void);
     void BuildGuestPmCtrlCmd(void);