- does qemu simulate a form of memory hot-plugging supported by that
guest OS?
- what is the qemu command to actually simulate such a hot-plugging
event?
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Jakob
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ation which is still online.
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ailable, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(2,0)
Enjoy
Jakob
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destroy
restart
destroy
/usr/bin/qemu-kvm
Enjoy
Jakob
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differently from equivalent software emulated
virtual machine state.
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is
a good (but not perfect) chance that the SeaBIOS provided by qemu
will map that legacy BIOS function to a similar release of the CPU
back to Linux.
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T
uction set,
which I don't think (I am not certain though) is available at all in
the 32 bit x86 instruction set. So I strongly suspect that it is
simply not available in i386 kernels.
Others on this list: Please correct me if I am wrong.
El Miércoles 4 de junio de 2014 19:10, Jakob Bohm
e
ading before it.
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es copy all the sectors and regenerate the tables that say which
sector is stored where in the file.
There are other speed problems inside the qemu tools, which are most
annoying to those of us who use them every day, but that is a different
discussion.
Thanks & Regards,
Upendra
Enjoy
Jakob
0 with kernel 3.15 and the default qemu.
Can any one help?
Thanks
Regards
2014-07-24
Scott Zhang
__
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Jakob
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Transformer
y later to confirm
On Jul 24, 2014 12:35 AM, "Jakob Bohm" wrote:
On 7/23/2014 6:22 PM, Sai Prajeeth wrote:
Try setting sockets=6,cores=1? I had this issue when running Solaris as
guest. For some reason Solaris never detected any of the cores. It could
only detect the sockets.
e kvm modules are
loaded in the host kernel AND VM extensions are enabled in the host CPU
AND it actually works. Otherwise qemu-system-i386 falls back to its
usual software emulation.
Enjoy
Jakob
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if the OK file was created or not before
proceeding to compress or otherwise package the image file. Be sure to
configure qemu to redirect the "console tty" of the creator system to
qemu's own stdout, so you can see the output in the build log.
Enjoy
Jakob
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our time.
references:
[1] http://en.wikibooks.org/wiki/QEMU/Images#Image_types
"QEMU supports several image types. The "native" and most flexible type
is /qcow2/, which supports copy on write
<http://en.wikibooks.org/wiki/QEMU/Images#Copy_on_write>, encryption,
compre
s rarely the cause of the
problem.
Enjoy
Jakob
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On 8/13/2014 3:22 PM, Brian Rak wrote:
On 8/13/2014 7:33 AM, Jakob Bohm wrote:
On 8/12/2014 8:40 PM, Brian Rak wrote:
I've been testing 2.1.0, and qemu will no longer start up with our CPU
configuration. I get the error:
qemu-kvm: /root/qemu/src/hw/i386/smbios.c:825: smbios_get_t
ts slowest
mode) can be easily configured or patched to collect some statistics
about each emulated instruction.
Enjoy
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On 28/08/2014 19:05, Brandon Williams wrote:
Hi there,
I'm trying to figure out a way that I can write to the serial port in
a thread that I have made in mac_oldworld and be able to read that
serial data from my target program (currently a modified OpenBIOS).
I am writing to the essc in my m
On 02/09/2014 10:33, shhuiw wrote:
Hi,
I'm new to qemu community, and I'm trying the COW image format (old but
simple:-).
I have read through its source code, and didn't find anything about 'copy on
write'.
I wonder wthat "COW" stands for?
COW = Copy On Write is a general computing technique w
ot on POSIX, but you are usually prompted first to
check if it was really you, and not some virus, that launched it).
4. Being reported as "root" (unix uid 0) by whatever POSIX emulation
layer (mingw32, MSYS, Cygwin, etc.) you run a ported unix tool under.
This could be for
lso did
not help. I confirmed this solution with libguestfs mailing list. They
asked me to to write to you. Could you please help me.
Thanks a lot in advance,
Enjoy
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cable between my host and the board. (host 10.10.10.1 and the board
10.10.10.11)
I tried setting ETH0IP to 129.254.132.47 in qemu-ifup script but it
didn't work.
Please anyone tell me what the problem is..
Kind regards,
Chan Kim
Enjoy
Jakob
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1e 32 a1 ff 48 c7 c6
40 71 d8 81 48 c7 c7 60 be 8c 81 31 c0 e8 64 02 00 00 fb 66 66 90 <66> 66 90 45
31 e4 e8 3a 49 aa ff 4d 39 ec 7c 18 41 83 f6 01 44
[2.282071] RIP [] panic+0x1c5/0x209
[2.282071] RSP
[2.282071] ---[ end trace 5c54a652a799b4be ]---
Enjoy
Jak
e made nicer by having working trim support.
I see that it's implemented in virtio-scsi, but there's a decent
performance hit for switching over to that.
Enjoy
Jakob
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) may refer
to a XEN hvm setup, not a Linux kvm setup.
--
Enjoy
Jakob
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an do this?
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ter the disaster:
- Restore disk image file as it was seen by the backup tool.
-Restart virtual machine from the disk image, memory image etc.
represented by thesnapshot named "Backup #" (loadvm).
Enjoy
Jakob
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Transform
king store, essentially removing the
snapshot (and making any references to disk contents in the
vmsave memory snapshot invalid anyway).
Enjoy
Jakob
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but
on most architectures, it involves something beyond a simple
ELF file.
As an alternative, you may want to look at options for loading
your kernel as a "ROM" firmware image, which would involve a
different set of conventions.
Enjoy
Jakob
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ssing on some rarely disabled interrupt
sources unconditionally.
One way around this (for debugging) would be to fill your IDT with
dummy handlers that tell you which one was called.
Enjoy
Jakob
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use?
Add the wheezy backports archive to /etc/apt/sources.list and
enjoy qemu 2.1.
Enjoy
Jakob
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uest partition on the
virtual disk has a block size which is a multiple of the qcow2
cluster_size.
In other words, the usual "4K issue" procedures, but on both the
physical and virtual machine.
Enjoy
Jakob
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, even when the corresponding copy of Internet Explorer does.
Enjoy
Jakob
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me know.
Have fun! That‘s an order :-)
Enjoy
Jakob
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, panicked and added a hard 4G limit.
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mething else, I don't remember right now).
Enjoy
Jakob
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ven ongoing downloads from the web server
should not be disrupted, except for a short pause while
the migration slows down the VM and the physical network
switch learns the new path to its MAC address.
Enjoy
Jakob
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Base || Base |
+-++-+
Note that disks are only identical during step 4
Enjoy
Jakob
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so cannot advise on its abilities.
*From: *Jakob Bohm mailto:jb-gnumli...@wisemo.com>>
*Date: *February 11, 2015 11:38:15 AM
*To: *qemu-discuss@nongnu.org <mailto:qemu-discuss@nongnu.org>
*Subject: **Re: [Qemu-discuss] vm live storage migration with
snapshots*
image served by qemu (on the
destination) based on *decoding* the qcow2 disk is treated as a raw
image, which it probably is, with the serving qemu instance mapping the
"raw" read/writes to proper qcow2 operations?
Just guessing of cause.
Enjoy
Jakob
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bridging, VDE daemon based
bridging, ...)
Which additional options have you specified to qemu regarding this
virtual network connection?
Enjoy
Jakob
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still be appreciated.
I think it is self-explanatory: Not enough free memory in
the system, mostprobably because your X server had
allocated too much.
The command "free" of the top lines in "top" output should
tell you how much is left.
Enjoy
Jakob
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obs.
But for now, it seems we will all have to make do with the
ugly hack of choosing a "similar" machine from a short list
of what others have created, and then adapt our test software
configurations to that unrealistic model, until we are ready
to test on the real hardware with a differ
t;volatility", which provides tools and scripts to examine
machine states found in such memory dumps.
Enjoy
Jakob
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ainly
exceptional.
Hmm, would a gcc invocation to link a real world large
program (like, say, LibreOffice)cause gcc topass a
similarly huge command line to /usr/bin/ld from binutils?
If so, this might affect using qemu(not qemu-system) for
cross compiles.
Enjoy
Jakob
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e,if=none,id=foo -device megasas,id=raid
-device scsi-disk,drive=foo,serial=1234,bus=raid.0
or
-device scsi-disk,drive=foo,serial=1234,scsi-id=0
Enjoy
Jakob
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Th
nd can get this from
some channel to the process that actually started qemu,
e.g. libvirt-bin or your own shell scripts.
Enjoy
Jakob
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anything similar in KVM/QEMU)
Thank you very much for your help!
Well, at least there is the virtio-net network adapter.
Enjoy
Jakob
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ly onhuman/legal means of preventing bad
behavior.
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Jakob
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arameters. Instead of describing my setup and
trying to work out were my mistakes lie, I would rather like to know
if anyone has done this before.
I guess it would be too optimistic to hope for some kind of tutorial
(although there is one for 64-bit Android:
https://www.linaro.org/blog/core-dump/
back to the raw commands described above. The
most popular GUI is Red Hat's libvirt, which is in
Debian, and probably in Raspian too.
Enjoy
Jakob
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er at the
PC/SC like API level.
b) Anything allowed to access the virtual reader at the
libusb API level.
c) Only from the actual kernel mode USB code in the Guest
kernel.
d) Nothing, if there is no bug.
Case d) is of cause the best case, a), the worst.
Enjoy
Jakob
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ny firewalls in the
guest OS. This part would be better asked in a forum
about the Guest OS and its firewall.
ps:
If there is any good docs out there, then please let me now. On google
i only find very generic stuff.
Thx, David
Enjoy
Jakob
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to make any difference.
Data from perf attacthed to the process might give the best clues.
Any information as to why this processes is comsuming so much CPU would
be much appreciated.
Regards,
Terry.
Enjoy
Jakob
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Transformervej 2
n the configure scripts and
try to figure out where it looks for zlib.h and
( zlib.so.* or zlib.a.*), or if it simply does a test
compile/link of a dummy program that referenceszlib.
Enjoy
Jakob
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On 28/05/2015 14:13, Yehuda Yitschak wrote:
Hi Jacob
-Original Message-
From: qemu-discuss-bounces+yehuday=marvell@nongnu.org
[mailto:qemu-discuss-bounces+yehuday=marvell@nongnu.org] On
Behalf Of Jakob Bohm
Sent: Wednesday, May 27, 2015 19:31
To: qemu-discuss@nongnu.org
Subject
eferenced file
offsets/sectors into your missing data, either
as a disk image or as files.
Step 9: This becomes a lot harder if Ubuntu was
encrypting its (virtual) disks, as you are then
looking for encrypted sectors that all look alike.
Hope for the best...
Jakob
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mu command line.
Enjoy
Jakob
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he qemu command lines use something like
-netdev bridge,id=hostnet1357,br=br1357
-device=,netdev=hostnet1357,id=net1357,mac=z2:zz:zz:zz:zz:zz,...
Inside the VMs configure the virtual network interface
with static IPv4 and static IPv6 addresses as usual.
Enjoy
Jakob
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been for
some time, with no adverse effect on real hardware,
then it might make sense for qemu to accept the quirky
driver as a service to the many users who want to boot
stock OS images.
Enjoy
Jakob
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ry to see which line looks most
like it could have "Id 1" .
That is the process that keeps failing to run so fast
that /sbin/init refuses to relaunch it until a 5
minute cool off period.
Then look in /var/log/syslog, /var/log/messages etc.
for reasons why that process refuses to run.
E
ow if it can be done with method B,
(except that it must be possible if libvirt/virsh
does it without rebooting the guest).
Note that older versions of libvirt refused to remove
the USB tablet it uses for mouse movements, and thus
the USB controller, which was quite annoying.
Enjoy
Jakob
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).
I don't remember the standard way for a physical
wake-on-lan card to tell the booting OS that the
computer was powered on due to a wake-on-lan packet
arriving, but this can probably be emulated in some
trivial way too.
Enjoy
Jakob
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eding
edge, because it aims for stability and safety.
Now I don't know if Mr. Baldini is in a position to
update to Debian 8 at this time, but just wanted to
clear up the mistaken belief that "Debian 7 is very
old".
Enjoy
Jakob
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booted and running in VMware, but given that they only emulate a
PCNet32 Ethernet device, I can’t get anything to talk to VINES since it doesn’t
have a PCNet32 driver!) …. so frustrating!!
—Dennis
Enjoy
Jakob
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Transformervej
run directly, with qemu (and its kvm
helper) just doing the sandboxing (and device I/O
emulation).
Enjoy
Jakob
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ual "motherboard"
hardware emulated by qemu might not have any "wake-on-PCI"
feature.
Enjoy
Jakob
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ng Linux crash dumps.
Enjoy
Jakob
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On 14/09/2015 16:49, Peter Maydell wrote:
On 14 September 2015 at 15:44, Jakob Bohm wrote:
On 14/09/2015 11:33, Peter Maydell wrote:
Rather than reinventing the wheel I suggest looking at how QEMU
already supports file-backed ROMs for other platforms...
Note that this is about *writable
les inside.
Another technique would be to use ISO specific tools to examine the
metadata of the ISO image, there may be useful info there.
Enjoy
Jakob
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the ISO image.
Dale
Just out of curiosity, how many SysV CD-ROMs included
the source code (this required a more expensive license)?
Anyway, qemu is often used for running outdated operating
systems just for the fun of it, no useful reason is needed.
Enjoy
Jakob
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4.0.1.tar.bz2/ but I don't know what to do with it. I can't
find an .exe file to install. Sorry but I'm a total noob at this. Hope
someone can give me a walkthrough on how to use it
Looking forward to your urgent reply.
Paolo Santiago
Enjoy
Jakob
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joy
Jakob
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al output. But I don't see any thing.
I have tried the same setup on my other windows 8.1 with same version
of qemu and it worked there. But I don't know why it does not work here.
Really, I wouldn't expect a December 2012 version to work flawlessly on
Windows 8.1 (NT 6.03) from 201
file
location, then your code on the guest (or another host)
can detect its appearance and proceed.
3. Have your program send a "network" message (such as
sending a packet to a port on the host) which will
signal your code on the host (or another guest).
Enjoy
Jakob
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aim to somehow utilize the monitor from the guest
itself and request it to stop the emulation. The only thing which
comes to mind is a communicating by a COM port, but I can not seem to
grasp how to do so.
Any thoughts?
Thank you,
Guy
Enjoy
Jakob
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ariables, including one saying where the
available RAM ends.
Addresses from 0x0 to 0x003FF is RAM and holds the
interrupt/exception handler table.
Enjoy
Jakob
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ncidents that Microsoft now auto-publishes drivers submitted
to them for signing, causing all kinds of havoc (such as
official vendor tools trying to downgrade to the stable
driver version and Windows Update forcing it back to the
latest driver version in an endless loop.)
Enjoy
Jakob
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to see the names of the chipsets (if not
already mentioned in that list).
On a similar note, I wonder if the "PC" model in qemu is
still stuck emulating a now historic base chipset that
originally didn't support PCIe.
Enjoy
Jakob
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ppears
in its output" control.
PS: you might prefer '-display none' over '-nographic';
that gives you the serial output to standard output, but
doesn't do the 'monitor on alternate screen, ctrl-a '
behaviour. You can j
ed to launch it.
On 21/12/2015 15:53, Wink Saville wrote:
Can you give me some pointers to implementations that use these
techniques. Txs.
On Mon, Dec 21, 2015, 4:02 AM Jakob Bohm mailto:jb-gnumli...@wisemo.com>> wrote:
There is a monitor and/or qmp command to simulate a "soft&q
eset the cpu". So
for ARM the poweroff is:
void ac_poweroff(void) {
volatile ac_u32* pUnlockResetReg = (ac_u32*)0x1020;
volatile ac_u32* pResetReg = (ac_u32*)0x1040;
*pUnlockResetReg = 0xA05F;
*pResetReg = 0x106;
}
So I'm hoping for x86 there would be something similar.
On Mon
are cached
by the on-CPU TLB or how many bytes ahead the
instruction decoder may look. But I don't think that
is a qemu feature anyway.
This still leaves the majority of code not doing memory barriers.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Tran
it simply loads the entire ISO image into RAM
before booting it, so the boot process can play with
the network adapter without loosing access to its "CD".
Check if the difference is close to the size of the ISO
file.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.
On 04/01/2016 17:23, Prem Anand Haridoss wrote:
From: qemu-discuss-bounces+h.prem.anand=gmail@nongnu.org
[mailto:qemu-discuss-bounces+h.prem.anand=gmail@nongnu.org] On Behalf Of
Jakob Bohm
Sent: 04 January 2016 15:56
To: qemu-discuss@nongnu.org
Subject: Re: [Qemu-discuss] Qemu reports
On 04/01/2016 22:29, Peter Maydell wrote:
On 4 January 2016 at 13:24, Jakob Bohm wrote:
For your information, the x86 memory model only requires
barriers in the following cases (this is somewhat
implemented on modern machines with multiple actual x86
CPU sockets, as opposed to multicore chips
On 05/01/2016 18:35, Peter Maydell wrote:
On 4 January 2016 at 22:00, Jakob Bohm wrote:
On 04/01/2016 22:29, Peter Maydell wrote:
On 4 January 2016 at 13:24, Jakob Bohm wrote:
https://en.wikipedia.org/wiki/Memory_ordering#In_symmetric_multiprocessing_.28SMP.29_microprocessor_systems
lists
On 06/01/2016 00:53, Peter Maydell wrote:
On 5 January 2016 at 23:10, Jakob Bohm wrote:
On 05/01/2016 18:35, Peter Maydell wrote:
(It would also be possible
to use the v8 ARM load-acquire and store-release instructions
rather than full on barriers, but on v7 I think barriers are
the only
t that setting has been set to in
your guest VM.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded
and
each qemu process handles only one guest, all of the qemu
source code knows which guest it is handling, because it
is only handling one guest.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
This public
er wants to simulate.
On 26/01/2016 04:51, Ata Fatahi baarzi wrote:
thank you dear, so is there an identifier, something like guest_id in
source code to find it each time which guest is getting service?
On Tue, Jan 26, 2016 at 1:11 AM, Jakob Bohm <mailto:jb-gnumli...@wisemo.com>> wrote:
t in the case of git
tree?
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. http://www.wisemo.com
Transformervej 29, 2860 Soborg, Denmark. Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded
/media/windows
So what I am doing wrongly?
Which qemu-img version are you using? Or which commit in the case of git
tree?
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45
on for the Linux
Bridge subsystem (on the Host) to do the missing MAC
filtering (similar to how the ARP subsystem can be
supplemented with an ARP daemon).
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16
arried by the same host signal.
The inspiration for all this is of cause the ways that qemu-user
shares other resources, such as the process address space.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
On 01/03/2016 14:08, Peter Maydell wrote:
On 1 March 2016 at 13:00, Jakob Bohm wrote:
As an alternative, could it be useful to look beyond the current
glibc code and see if there is a way for qemu-user to provide the
full set of Linux syscall provided facilities (including signals
and calls
ommand line).
4. The Linux kernel loads on the pre-initialized CPU
and accesses the pre-initialized GPU for display
output.
5. At some point in the boot process (maybe the kernel
phase, maybe a script on an initrd) mounts the "ext2,
ext3 or ext4" partition or file as Linux root, t
Qemu itself is another. Games that
use letters as navigation keys (WASD etc.) or require precise
timing of key presses is a third group.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
This public discus
the
drive.
Only to configure the BIOS itself (because there was no
hardware level request the BIOS could use).
On the INT 13h level, there is a much older call (other
than AH=48h), which returns the size in C/H/S form, this
is what OS-es use on machines without the modern LBA calls.
Enjoy
Jako
ine should be run using the KVM kernel
module or not. In the past that option was only
available in the special qemu-kvm program.
See man qemu-system-x86_64 for the exact names options.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Sø
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