On Sat, May 26, 2012 at 02:51:29PM +0200, Andreas Färber wrote:
Am 26.05.2012 07:55, schrieb 陳韋任:
On Fri, May 25, 2012 at 06:13:25PM -0400, Ira Ray Jenkins wrote:
I found a GSOC11 project that attempted to port the Android Goldfish
platform to mainline QEMU. Was this project successful
]);
+}
+}
+}
Do you think use VMState rather then QEMUFile is a good idea?
I saw OpenRISC target got this kind of feedback before [1].
Regards,
chenwj
[1] http://lists.gnu.org/archive/html/qemu-devel/2012-05/msg02457.html
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it not get merged
into trunk. I don't know why. :)
Regards,
chenwj
[1] http://lists.gnu.org/archive/html/qemu-devel/2011-08/msg02436.html
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/*.
The term target could be a little MISLEADING here. :)
Regards,
chenwj
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you can use `time` to measure the timing in user mode, but things
seems get quit complicate in system mode.
Regards,
chenwj
[1] http://blog.gmane.org/gmane.comp.emulators.qemu.coremu.devel/month=20120401
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?
In dyngen-exec.h, the CPUArchState *env is kept in particular host register
(AREG0), so you shouldn't use env here somehow. Maybe Blue can show you some
example how to do that, target-sparc/* might be a place?
Regards,
chenwj
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a
global static not per-process one. I'll try systemtap latter but not sure it
does the same thing I want to do.
Any thoughts? :)
Regards,
chenwj
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Chen (陳韋任)
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[1].
Regards,
chenwj
[1] http://en.wikipedia.org/wiki/OpenRISC
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);
}
---
Leave to vmstate_save_state/vmstate_load_state (savevm.c) do the real things.
Regards,
chenwj
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Hi all,
I would like to know if I can retrieve pre-process information in QEMU
system mode. For example, I want to know each process's page fault ratio.
Is there a way to do that?
Thanks.
Regards,
chenwj
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that we can use clang to compile QEMU?
How much the performance lose?
Regards,
chenwj
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more about it, but
googling doesn't help. Would you mind to shed some light on that? Thanks.
Regards,
chenwj
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=229376, val=0, mmu_idx=0) at
/tmp/chenwj/qemu-0.13.0/softmmu_template.h:245
---
Thanks!
Regards,
chenwj
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.
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to do this in QEMU? Thanks.
Maybe take a look at
http://lists.gnu.org/archive/html/qemu-devel/2008-07/msg00507.html
Regards,
chenwj
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, then it's easier to make it a good shape.
Regards,
chenwj
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think
replace qemu with particular name is inappropriate.
When qemu is not used for the name of the executable, it
should be written QEMU.
Agreed.
I have no idea about remaining stuff. :)
Regards,
chenwj
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Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science
functions, but they are -
as far as I know - not applicable for my task.
Just a quick reply. QEMU system mode provides -singlestep option. Maybe you
can start from there, see how the singlestep is done.
Regards,
chenwj
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head and QEMU 0.13.
Thanks in advance. :)
Regards,
chenwj
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On Sun, Apr 22, 2012 at 12:07:40PM +0800, 陳韋任 wrote:
I am using qemu to run VMs on my computer with amd chip on board.
However, my computer doesn't support amd-v, so the performance of the VM is
low.
I do have experiences in optimization of program using sse technique.
Is it possible
. Maybe you can try to map
guest SIMD into host SIMD.
Good Luck!
Regards,
chenwj
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TLB lookup hit/miss looks like.
If TLB miss, it will call something like __ldb_mmu (b). __ldb_mmu will try to
walk guest page table, then fill TLB entry if page table hit, or raise a guest
page fault exception if page table miss.
HTH,
chenwj
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-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
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7.2 support PIE? QEMU default build is PIE. Try disable PIE build
then run gdb 7.2 again?
Regards,
chenwj
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!
Regards,
chenwj
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-Ren Chen (陳韋任)
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block linking to cross
guest page boundary.
Am I right? If so far so good, I am curious about why we need (s-pc - 1)
instead of just (s-pc). Could you shed some light on that? Thanks in advance!
Regards,
chenwj
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(陳韋任)
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about inserting your own helper functions instead of an interrupt?
Regards,
chenwj
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program...
You have to know that even a simple helloworld contains many instructions
than you thought (dynamic linker, for example). My suggestion is using
`objdump` at the same time to locate the function you're interested in, then
look into the log.
Regards,
chenwj
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linux-0.2.img with a modified QEMU whose cpu_unlink_tb does nothing.
Everything seems work fine. Is this experiment too trivial to show what
bad things happened when we don't unlink tb?
Thanks! :)
Regards,
chenwj
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. Besides, Ctrl + C can not terminate QEMU, I have
to
use `kill` to stop it.
Is this what you expect?
Regards,
chenwj
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is for address translations (guest virtual to
host virtual) in system mode, that's all I can tell.
Regards,
chenwj
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will detect this error (occurred in the CPU itself). So
depends on what you mean exception, do_interrupt or gen_exception might does
the real work.
Regards,
chenwj
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/archive/html/qemu-devel/2012-01/msg01897.html
Regards,
chenwj
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Il 28/03/2012 09:53, Zhi Yong Wu ha scritto:
By the way, why have we not add one QOM cookbook to docs? It is very
useful for us newbiew to learn.
You can write what you learn during this work. This should be a good
start! :)
Regards,
chenwj
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On Wed, Mar 28, 2012 at 04:25:54PM +0800, Zhi Yong Wu wrote:
On Wed, Mar 28, 2012 at 4:05 PM, 陳韋任 che...@iis.sinica.edu.tw wrote:
Il 28/03/2012 09:53, Zhi Yong Wu ha scritto:
By the way, why have we not add one QOM cookbook to docs? It is very
useful for us newbiew to learn.
You can
for all ASE DSP instructions can be just one patch.
Regards,
chenwj
[1] MIPS32® Architecture for Programmers VolumeIV-e: The MIPS® DSP
Application-Specific Extension to the MIPS32®Architecture
http://www.mips.com/products/product-materials/processor/mips-architecture/
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Another question, how can I boot up Android on QEMU?
IIRC, QEMU is lack of some hw support needed by Android platform, so the
answer might be no.
Regards,
chenwj
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QEMU? Thanks.
are you referring to you Qemu system emulation or Qemu user mode?
Does that matter? I think -d op should be enough, right?
Regards,
chenwj
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:
But it is hard to localize a specific program instead of lots of logs.
On Mar 15, 2012 4:14 AM, 陳韋任 che...@iis.sinica.edu.tw wrote:
On Thu, Mar 15, 2012 at 01:26:44PM +0700, Mulyadi Santosa wrote:
On Thu, Mar 15, 2012 at 09:12, Yue Chen ycyc...@gmail.com wrote:
Hi!~
Now I'd like to see
http://qemu.weilnetz.de/qemu-doc.html#QEMU-User-space-emulator
On Thu, Mar 15, 2012 at 10:42:02PM -0400, Yue Chen wrote:
So how to run a Windows program or Linux program under user mode ? I cannot
find useful documentations. Many thanks.
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target_ulong pc.
Regards,
chenwj
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CC'ed to the list.
On Wed, Mar 07, 2012 at 07:47:08PM +0800, WanPeng Li wrote:
On Tue, Mar 06, 2012 at 06:10:16PM +0800, 陳韋任 wrote:
I read pci code in qemu about i440fx, pci.c and so on. I think if guest
os whose mainboard is based on x86, it will use IO instructions to
access PCI
a file with the events you want to trace:
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/Conventional_PCI
[4] http://en.wikipedia.org/wiki/General_Purpose_Input/Output
[5] 系统虚拟化:原理与实现
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-archive.com/qemu-devel@nongnu.org/msg99864.html
HTH,
chenwj
[1]
http://wiki.qemu.org/Documentation/GettingStartedDevelopers#Getting_to_know_the_code
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this translation works
properly, but I've been unable to find much. Is there something I should be
reading before asking around here? If yes, please, point me to it!
See above.
Regards,
chenwj
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multithreaded, right? Is there a better way to solve this?
Regards,
chenwj
[1]
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.187.6011rep=rep1type=pdf
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;
* }
*
Why to use klass, not class?
Because in C++, class is a reserved word. It is quite typical idiom
to replace class with klass in (public) headers.
I thought QEMU is written in C, right? Is there anything related to C++?
Regards,
chenwj
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potentially trapping guest instructions in the same order with
respect to the guest store instructions.
Thanks!
Regards,
chenwj
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different problems on the way of paralleling the TCG.
I'm sure that those approaches should be used in future work.
FWIW, COREMU maintainer tends to upstream their work but they have
another project to do right now, so ... ;)
Regards,
chenwj
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the paper PQEMU: A Parallel System Emulator Based on QEMU help on
this?
Regards,
chenwj
[1] http://www.cs.nthu.edu.tw/~ychung/conference/ICPADS2011.pdf
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3: or give me some introduce of FDC.
http://en.wikipedia.org/wiki/Floppy_disk_controller
HTH,
chenwj
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-Ren Chen (陳韋任)
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Hi Stefan,
Peter already fix this issue [1]. Please ignore my patch, thanks!
Regards,
chenwj
[1] http://patchwork.ozlabs.org/patch/142306/
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...which Peter has already done:
http://patchwork.ozlabs.org/patch/142306/
Please coordinate with him.
O.K., I already told Stefan to ignore my patch. :)
Thanks!
Regards,
chenwj
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Hi Rajat,
Great work! It seems this is a kind of like static compilation, right? I think
people are more interested in using QEMU as a dynamic translator as a library.
Would you mind to tell me what scenario your work aims to?
Regards,
chenwj
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Commit 7b93fadf3a38d1ed65ea5536a52efc2772c6e3b8 adds basic version of bridge
helper, but introduces dependency issue at the same time. While building target
xxx-linux-user, qemu-bridge-helper.c needs config-host.h which is not generated
at the moment. Building recurse-all target first fixes the
Commit 7b93fadf3a38d1ed65ea5536a52efc2772c6e3b8 adds basic version of bridge
helper, but introduces dependency issue at the same time. While building target
xxx-linux-user, qemu-bridge-helper.c needs config-host.h which is not generated
at the moment. Explicitly declaring the dependency for the
On Tue, Feb 21, 2012 at 12:27:26PM +, Stefan Hajnoczi wrote:
On Tue, Feb 21, 2012 at 10:12 AM, 陳韋任 che...@iis.sinica.edu.tw wrote:
Commit 7b93fadf3a38d1ed65ea5536a52efc2772c6e3b8 adds basic version of
bridge
helper, but introduces dependency issue at the same time. While building
+1
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+1
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+1
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+1
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+1
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+1
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+1
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probably don't want to be using a hardware
debug
probe (i.e. the qemu gdb stub) at all. Instead you want to be using the debug
facilities provided by your operating system. On linux this would be ptrace,
probably via gdbserver.
I see. Thanks.
Regards,
chenwj
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On Fri, Feb 10, 2012 at 08:14:41AM +, Stefan Hajnoczi wrote:
On Thu, Feb 09, 2012 at 06:33:16PM +0800, 陳韋任 wrote:
The question is not so related to QEMU itself, but I want to give it a
try.
I am running a tiny OS on QEMU and debugging it with gdbstub. The tiny OS
will
fork
(env); ---
return env;
}
Just follow qemu_init_vcpu and you'll see how vcpu thread is spawn.
Regards,
chenwj
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. This seems to be a bug
or missing feature in GDB remote protocol. [1]
Is there a way to do what I'm trying to do? Thanks!
Regards,
chenwj
[1] http://sourceware.org/bugzilla/show_bug.cgi?id=13584
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think it's main_loop_wait in main-loop.c,
right?), and it leave blocking I/O system calls to posix-aio-compat.c worker
threads? Is that correct?
Thanks!
Regards,
chenwj
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support for multi-threaded
application, it's possible to emulate a architecture with stronger memory
model on a weaker one?
Regards,
chenwj
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indentation cleanup.
Signed-off-by: Chen Wei-Ren (陳韋任) che...@iis.sinica.edu.tw
---
v1 - v2:
Didn't notice tab in previous patch, please use this patch instead.
Sorry about that.
cpu-exec.c | 10 +-
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/cpu-exec.c b/cpu-exec.c
index
indentation cleanup.
Signed-off-by: Chen Wei-Ren (陳韋任) che...@iis.sinica.edu.tw
---
cpu-exec.c | 10 +-
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/cpu-exec.c b/cpu-exec.c
index a9fa608..f7f19f5 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -1,5 +1,5 @@
/*
- * i386 emulator main
is somehow easy to comprehend. As for kernel boot, is
there any detailed document? I need some to make it clearer.
I guess not. You might need to read the source code first then ask question
here. :)
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science
] instead?
Regards,
chenwj
[1] http://www.libcpu.org/wiki/Main_Page
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
of process
B is existed, QEMU refill the virtual pc hash table. Otherwise, it does
the translation.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
On Fri, Jan 20, 2012 at 08:54:12AM -0500, Xin Tong wrote:
On Fri, Jan 20, 2012 at 3:23 AM, 陳韋任 che...@iis.sinica.edu.tw wrote:
1. The control of gCR3 and hCR3 needs kernel access. While they can
be set with a device module as what is done in kvm. Trapping into the
kernel every time gCR3
when exceptions have occurred in the code cache. Am I right ?
Not exactly. `grep -r cpu_resume_from_signal` shows places using
cpu_resume_from_signal. Not all of them means something faulty has happened,
I think.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute
], maybe you can seek for help on their mailing list
too.
[1] http://sourceforge.net/p/coremu/home/Home/
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw
!= NULL; curr_cpu = curr_cpu-next_cpu) {
...
}
Seems this is a proper way to iterate all virtual cpus.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http
if there is another thread calls cpu_loop_exit when TCG is
doing the translation?
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
spawns these threads and what do these threads do ?
The block layer's thread pool.
Qemu 1.0 enable IO thread by default, I think that's why you can see there are
two threads. You can check block/raw-posix-aio.h, posix-aio-compat.c and
linux-aio.c.
HTH,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer
on) into the memory. In this case, icache/dcache should be
sync'ed.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
://en.wikipedia.org/wiki/Memory_ordering
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
to helpers for exits from the code cache,
we need to change the paging mechanism back to non-nested. can this be
done ? how expensive will this be ?
Why the memeory references done by the host will be broken?
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information
is QEMU only need to follow guest memory operations when translates
guest binary to TCG ops. When translate TCG ops to host binary, it also has to
be careful not to mess up the memory ordering.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia
In cpu_exec() env is a local variable. In do_interrupt() it is the global
variable (held in a specific register via asm(AREG0)). The two aren't
necessarily the same value, hence the fiddling about.
Do you mean we sync env with envl at this point?
Regards,
chenwj
--
Wei-Ren Chen (陳韋任
/msg03643.html
HTH,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
On Fri, Jan 20, 2012 at 09:09:46AM +, Peter Maydell wrote:
On 20 January 2012 06:12, 陳韋任 che...@iis.sinica.edu.tw wrote:
Out of curiosity. What's ARM memory model? From the Wikipedia [1], it seems
ARMv7 has the same memory model as IA64.
The ARM memory model is the set of semantics
or not. If something goes wrong, it
turns to call tb_find_slow to use physical pc to do a slow search. The size
should not be the reason for having 2 hash tables.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799
{
}
Many thanks! :)
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
functions use the global env, while others use
function parameter env. Is it necessary? Or we can unify how they use env?
Thanks.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
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