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Just adding `-device virtio-rng-pci' to the QEMU invocation will
add the device with a default host backend. As of QEMU 1.3+,
the default backend is to use the host's /dev/random as a
source of entropy. [1]
When the entropy pool is empty, reads from /dev/random will
block until additional environmental noise is gathered. [2]
For Yocto, if call runqemu frequently, it will consume lots
of host's /dev/random, and kernel finish crng init in guest get
more and more slowly.
Here are 4 times runqemu boot test:
[ 3.464432] random: crng init done
[ 20.874030] random: crng init done
[ 23.583589] random: crng init done
[ 23.858945] random: crng init done
Modify entropy source to /dev/urandom device on the host which
returns random bytes using a pseudorandom number generator seeded
from the entropy pool. Reads from this device do not block and
kernel finish crng init in guest will not delay.
Of course, the side effect is obviously, we lost the quality of
randomness, but the modification is only on runqemu script
rather than real embedded device, and it benefits oeqa efficiency
in which many cases call runqemu especially multiple oeqa builds
on one host.
After apply the fix:
[ 3.364670] random: crng init done
[ 4.619061] random: crng init done
[ 3.403897] random: crng init done
[ 3.450717] random: crng init done
[1] https://wiki.qemu.org/Features/VirtIORNG
[2] http://man7.org/linux/man-pages/man4/random.4.html
(From OE-Core rev: 853644f82eb3205ef3efc1ea3959c7225dfacf61)
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Replace the deprecated '-usbdevice' option with '-device usb-xx' option.
This would fix runqemu boot error like below.
'-usbdevice' is deprecated, please use '-device usb-...' instead
(From OE-Core rev: 2f1f3480d344f8521e01f456d2dcd6c4e989ec59)
Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Bring across the comment that was in runqemu regarding why the
virtio-rng-pci device was needed. This comment is added to each location
where the virtio-rng-pci device is added.
(From OE-Core rev: bc5d1fdea674e842e4b0c45b38782930ec133051)
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Not all QEMU machines (outside of those available in OE-Core) are
capable of using the virtio-rng-pci device due to various machine models
not having a pci/virtio bus. This makes it such that the use of the
'-device virtio-rng-pci' flag to QEMU is machine specific.
This patch removes the general addition of the flag to all runqemu
targets and adds the flag into the QB_OPT_APPEND for all the qemu*
machines in OE-Core that support its use (which is all of them).
(From OE-Core rev: e890c05e66a21702e9e8ccce794b74cb7f5518ed)
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Add qemuboot-mips.inc to reduce duplicated code, the various mips bsps
which can be boot by runqemu can require qemuboot-mips.inc
(From OE-Core rev: cb28128477e98ed7dc7a90dd197f6dd04cf75be0)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Hongxu Jia
Chen Qi
Nathan Rossi
Robert Yang