jshen28

Simple vsock setup for QEMU

Configuration

Host Kernel: rawhide 4.13.0-0.rc6.git4.2.fc28.x86_64 (on Fedora 24)

QEMU is mainline built from sources: QEMU emulator version 2.10.50 (v2.10.0-105-g223cd0e)

Guest: clear-17460-kvm.img (which has vsock support)

How to launch QEMU from command line without libvirt with macvtap and vhost support

This sets up a host local bridge with a macvlan interface for VM to host communication. The macvtap is setup with vhost support.

The command line options to note are

-netdev tap,fd=3,id=hostnet0,vhost=on,vhostfd=4 3<>$"$tapdev" 4<>/dev/vhost-net -device virtio-net-pci,netdev=hostnet0,id=net0,mac=$(< /sys/class/net/testtap/address)

This sets up two different fd's. The first for macvtap and the second for vhost-net.

QEMU arm64 cloud server emulation

This is basically a rehash of an original post on CNXSoft - all credit (particularly for the Virtio device arguments used below) belongs to the author of that piece.

Download the latest uefi1.img image. E.g. ubuntu-16.04-server-cloudimg-arm64-uefi1.img from https://cloud-images.ubuntu.com/releases/16.04/release/

Download the UEFI firmware image QEMU_EFI.fd from https://releases.linaro.org/components/kernel/uefi-linaro/latest/release/qemu64/

Determine your current username and get your current ssh public key:

HTTP Streaming (or Chunked vs Store & Forward)

The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.

However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on

	sudo apt-get install git g++ gcc automake autoconf libtool make gcc libc-dev libssl-dev pkg-config libtasn1-6-dev libjson-glib-dev expect gawk socat libseccomp-dev -y
	cd ~
	git clone https://github.com/stefanberger/swtpm.git
	git clone https://github.com/stefanberger/libtpms.git
	cd libtpms
	./autogen.sh --prefix=/usr --with-tpm2 --with-openssl
	make
	sudo make install
	cd ../swtpm
	./autogen.sh --prefix=/usr

	#include "list.h"
	#include "stdlib.h"
	#include "stdio.h"
	#include "stddef.h"

	typedef struct component {
	int id;

	// This is used to link components together in their list
	struct list_head list_node;

	FROM golang:1.9

	WORKDIR /go/src/github.com/purplebooth/example
	COPY . .
	RUN go build -ldflags "-linkmode external -extldflags -static" -a main.go

	FROM scratch
	COPY --from=0 /go/src/github.com/purplebooth/example/main /main
	CMD ["/main"]

	#include <stdio.h>
	#include <unistd.h>
	#include <memory.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <linux/types.h>
	#include <linux/netlink.h>
	#include <linux/rtnetlink.h>

	#define BUF_SIZE 8192

	$ erlc processes.erl
	$ erl -noshell -s processes test -s init stop
	the max processes is 262144
	the proecess time is 2.0:3.57
	$ erl -noshell -s processes test2 100000 -s init stop
	the max processes is 262144
	{"init terminating in do_boot",{system_limit,[{erlang,spawn,[erlang,apply,[#Fun<processes.2.26012808>,[]]],[]},{erlang,spawn,1,[]},{processes,for,3,[{file,"processes.erl"},{line,24}]},{processes,for,3,[{file,"processes.erl"},{line,24}]},{processes,max,1,[{file,"processes.erl"},{line,10}]},{init,start_it,1,[]},{init,start_em,1,[]}]}}

	# program freeze here...
	# Ctrl+C not work