Building QEMU for Pintos on Ubuntu

From:

/SSE3044F12/QEMU

Install QEMU full system emulation binaries

Install the qemu-system package and make a symbolic link from /usr/bin/qemu to/usr/bin/qemu-system-i386.

$ sudo apt-get install qemu-

system

$ cd /usr/bin

$ sudo ln -s qemu-system-i386

qemu

Modify the Pintos script

In Pintos, QEMU (or bochs) is invoked via the script ~/pintos/src/utils/pintos. The script attaches the'-no-kqemu' argument when QEMU is used as a system simulator, but the current version of qemu does not undertand that argument. So, we simply drop the argument by commenting out the corresponding line (line 622) in the ~/pintos/src/utils/pintos script.

...

# Runs QEMU.

sub run_qemu {

print "warning: qemu doesn't support --terminal\n"

if $vga eq 'terminal';

print "warning: qemu doesn't support jitter\n"

if defined $jitter;

my (@cmd) = ('qemu');

#push (@cmd, '-no-kqemu');

push (@cmd, '-hda', $disks[0]) if defined $disks[0];

push (@cmd, '-hdb', $disks[1]) if defined $disks[1];

push (@cmd, '-hdc', $disks[2]) if defined $disks[2];

push (@cmd, '-hdd', $disks[3]) if defined $disks[3];

push (@cmd, '-m', $mem);

push (@cmd, '-net', 'none');

push (@cmd, '-nographic') if $vga eq 'none';

push (@cmd, '-serial', 'stdio') if $serial && $vga ne 'none';

push (@cmd, '-S') if $debug eq 'monitor';

push (@cmd, '-s', '-S') if $debug eq 'gdb';

push (@cmd, '-monitor', 'null') if $vga eq 'none' && $debug eq 'none';

run_command (@cmd);

}

...

Now use it!

QEMU (instead of bochs) can be used to run Pintos by specifying --qemu argument when you run the ~/pintos/src/utils/pintos script as follows:

$ cd ~/pintos/src/threads

$ make

$ ../utils/pintos --qemu -- run

alarm-multiple

Note that if you want to use QEMU during make check, you have to change the definition of SIMULATORfrom --bochs to --qemu in the Make.vars file in

~/pintos/src/[threads|userprog|vm|filesys]/ directories.

# -*- makefile -*-

kernel.bin: DEFINES =

KERNEL_SUBDIRS = threads devices lib lib/kernel $(TEST_SUBDIRS)

TEST_SUBDIRS = tests/threads

GRADING_FILE = $(SRCDIR)/tests/threads/Grading

SIMULATOR = --qemu