From 39a650e570a92226edf198c9e8760b4a920af80f Mon Sep 17 00:00:00 2001 From: Chris Johns Date: Mon, 27 Jun 2016 16:45:18 +1000 Subject: Add VDE and QEMU doco. --- libbsd.txt | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/libbsd.txt b/libbsd.txt index 2c2f5303..7c678738 100644 --- a/libbsd.txt +++ b/libbsd.txt @@ -409,6 +409,57 @@ brctl addif qbri eth0 dhclient qbri ------------------------------------------------------------------------------- +=== VDE and QEMU + +On FreeBSD you can create VDE or the Virtual Distributed Ethernet to create a +network environment that does not need to run qemu as root or needing to drop +the tap's privileges to run qemu. + +VDE creates a software switch with a default of 32 ports which means a single +kernel tap can support 32 qemu networking sessions. + +To use VDE you need to build qemu with VDE support. The RSB can detect a VDE +plug and enable VDE support in qemu when building. On FreeBSD install the VDE +support with: + + # pkg install -u vde2 + +Build qemu with the RSB. + +To network create a bridge and a tap. The network is 10.10.1.0/24. On FreeBSD +add to your /etc/rc.conf: + + cloned_interfaces="bridge0 tap0" + autobridge_interfaces="bridge0" + autobridge_bridge0="re0 tap0" + ifconfig_re0="up" + ifconfig_tap0="up" + ifconfig_bridge0="inet 10.1.1.2 netmask 255.255.255.0" + defaultrouter="10.10.1.1" + +Start the VDE switch as root: + + # sysctl net.link.tap.user_open=1 + # sysctl net.link.tap.up_on_open=1 + # vde_switch -d -s /tmp/vde1 -M /tmp/mgmt1 -tap tap0 -m 660 --mgmtmode 660 + # chmod 660 /dev/tap0 + +You can connect to the VDE switch's management channel using: + + $ vdeterm /tmp/mgmt1 + +To run qemu: + + $ qemu-system-arm \ + -serial null \ + -serial mon:stdio \ + -nographic \ + -M xilinx-zynq-a9 \ + -net nic,model=cadence_gem,macaddr=0e:b0:ba:5e:ba:11 \ + -net vde,id=vde0,sock=/tmp/vde1 + -m 256M \ + -kernel build/arm-rtems4.12-xilinx_zynq_a9_qemu/rcconf02.exe + == Issues and TODO * PCI support on x86 uses a quick and dirty hack, see pci_reserve_map(). -- cgit v1.2.3