Re: [qemu-devel Small Fix For Qemu Apic For Mac

Posted on 14.03.2020admin

Re: [qemu-devel Small Fix For Qemu Apic For Mac 5,8/10 4237 votes

March 20, 2018, 1:54 a.m. UTC QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'.

However this rule actually does not make sense and creates issues for when the included file is generated. In C, include 'file' means look in current directory, then on include search path. Current directory here means the source file directory. By comparison include means look on include search path. As generated files are not in the search directory (unless the build directory happens to match the source directory), it does not make sense to include them with ' - doing so is merely more work for preprocessor and a source or errors if a stale file happens to exist in the source directory.

Note that should some generated files be missed by this tree-wide refactoring, it isn't a big deal - this merely maintains the status quo, and this can be addressed by a separate patch on top. Signed-off-by: Michael S. March 20, 2018, 1:05 p.m. UTC On Tue, Mar 20, 2018 at 03:54:36AM +0200, Michael S. Tsirkin wrote: QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'. However this rule actually does not make sense and creates issues for when the included file is generated. In C, include 'file' means look in current directorythen on include search path.

Current directory here means the source file directory. By comparison include means look on include search path. As generated files are not in the search directory (unless the build directory happens to match the source directory), it does not make sense to include them with ' - doing so is merely more work for preprocessor and a source or errors if a stale file happens to exist in the source directory. This changes include directives for all generated files, across the tree. The idea is to avoid sending a huge amount of email.

But when merging, the changes will be split with one commit per file, e.g. For ease of bisect in case of build failures, and to ease merging. Note that should some generated files be missed by this tree-wide refactoring, it isn't a big deal - this merely maintains the status quoand this can be addressed by a separate patch on top. Signed-off-by: Michael S. Tsirkin For the record, the stated advantage is that one can have a header file that happens to match the system header. To put it bluntly that does not work as designed.

For example, if a system header foo.h somewhere has #include then the compiler will happily pull in our own version (since that is in the -I path) and completely ignore the system one, breaking things in the process. When does it make sense to use include '? When the header is a directory-specific one, located with the source. This approach would both be enforced by the compiler and help people know where to find the header. March 20, 2018, 1:10 p.m. UTC On Tue, Mar 20, 2018 at 03:54:36AM +0200, Michael S. Tsirkin wrote: QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'.

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However this rule actually does not make sense and creates issues for when the included file is generated. In C, include 'file' means look in current directorythen on include search path. Current directory here means the source file directory.

By comparison include means look on include search path. As generated files are not in the search directory (unless the build directory happens to match the source directory), it does not make sense to include them with ' - doing so is merely more work for preprocessor and a source or errors if a stale file happens to exist in the source directory. This changes include directives for all generated files, across the tree. The idea is to avoid sending a huge amount of email.

But when merging, the changes will be split with one commit per file, e.g. For ease of bisect in case of build failures, and to ease merging. Note that should some generated files be missed by this tree-wide refactoring, it isn't a big deal - this merely maintains the status quoand this can be addressed by a separate patch on top. Stale header files are a pain. I often do make distclean before checking out a radically different QEMU version to avoid the problem. This patch trades off the stale header file issue for a new approach to using vs ', which will be hard to use consistently in the future since it is unconventional. Is the build time improvement worth it (please post numbers)?

March 20, 2018, 1:30 p.m. UTC On Tue, Mar 20, 2018 at 01:10:41PM +0000, Stefan Hajnoczi wrote: On Tue, Mar 20, 2018 at 03:54:36AM +0200, Michael S. Tsirkin wrote: QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'.

For ease of bisect in case of build failures, and to ease merging. Note that should some generated files be missed by this tree-wide refactoring, it isn't a big deal - this merely maintains the status quoand this can be addressed by a separate patch on top. Stale header files are a pain.

I often do make distclean before checking out a radically different QEMU version to avoid the problem. This patch trades off the stale header file issue for a new approach to using vs ', which will be hard to use consistently The proposed rule is to use everywhere except if the file is in the source directory. It will be very easy to use consistently for the simple reason that compiler will enforce it. If you use for a header in the current directory build fails. So you are forced to use '. in the future since it is unconventional.

All compilers I know without exception implement include meaning look in -I search path, and include ' meaning look in current directory then in -I search path. Looks conventional to me. Is the build time improvement worth it (please post numbers)? Stefan Haven't tested it frankly. Will it convince anyone if it's marginally faster? March 20, 2018, 1:32 p.m.

UTC HiSo for these, we should use '. None of these are generated files though. That leads to crazy inconsistent message for developers where 50% of QEMU header files must use and the other 50% of header files must use '. The rules are pretty simple though: (1) Headers which are generated use. (2) Headers which are in include/ use.

(3) Headers sitting in the same directory as the source files use '. Other cases should not exist (when headers from another source directory are included they should most likely be moved to include/). Cheers, Gerd. March 20, 2018, 1:41 p.m.

UTC On Tue, Mar 20, 2018 at 02:32:16PM +0100, Gerd Hoffmann wrote: HiSo for these, we should use '. None of these are generated files though. That leads to crazy inconsistent message for developers where 50% of QEMU header files must use and the other 50% of header files must use '. The rules are pretty simple though: (1) Headers which are generated use. (2) Headers which are in include/ use.

(3) Headers sitting in the same directory as the source files use '. We have 1200 header files in QEMU - a developer might just reasonably remember which header file is a QEMU header, vs which is a 3rd party system header. Expecting devs to remember which of those 3 buckets each QEMU header falls under is unreasonable IMHO. Regards, Daniel.

March 20, 2018, 1:46 p.m. UTC On 14:32, Gerd Hoffmann wrote: HiSo for these, we should use '. None of these are generated files though. That leads to crazy inconsistent message for developers where 50% of QEMU header files must use and the other 50% of header files must use '. The rules are pretty simple though: (1) Headers which are generated use. (2) Headers which are in include/ use. (3) Headers sitting in the same directory as the source files use '.

Please don't. The normal way of including header files in QEMU is to use ' - also for headers that are not in the same directory. For example just do a grep -r '^#include.hw/' hw/ from the top directory and you'll see what I mean. Changing that rule is crazy. So please, let's just fix the configure script to detect some more stale files in the source tree, and we're done. March 20, 2018, 1:53 p.m. UTC On Tue, Mar 20, 2018 at 02:46:46PM +0100, Thomas Huth wrote: On 14:32, Gerd Hoffmann wrote: HiSo for these, we should use '.

None of these are generated files though. That leads to crazy inconsistent message for developers where 50% of QEMU header files must use and the other 50% of header files must use '. The rules are pretty simple though: (1) Headers which are generated use. (2) Headers which are in include/ use.

(3) Headers sitting in the same directory as the source files use '. Please don't.

The normal way of including header files in QEMU Stress on 'in QEMU'. is to use ' - also for headers that are not in the same directory. For example just do a grep -r '^#include.hw/' hw/ from the top directory and you'll see what I mean. Changing that rule is crazy.

So please, let's just fix the configure script to detect some more stale files in the source tree, and we're done. Thomas The rule probably served a useful purpose when all headers where in the same directory as the source. We moved them out so that is no longer the case.

March 20, 2018, 4:12 p.m. UTC On 08:54 PM, Michael S. Tsirkin wrote: QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'. I'm replying without having read the rest of the thread, so bear with me if I repeat some of the other comments that have already been made And Markus even just did a cleanup along those lines. However this rule actually does not make sense and creates issues for when the included file is generated. In C, include 'file' means look in current directorythen on include search path.

Current directory here means the source file directory. By comparison include means look on include search path. It's also nice when 'file' means file belonging to our project, and means 3rd-party file. So we have to choose which semantics are easier; perhaps better Makefile rules that prevent us from seeing stale files is a better solution than figuring out which files are generated. As generated files are not in the search directory (unless the build directory happens to match the source directory), Why can't we fix Makefile to include BOTH the build and the source directories (to pick up generated files first, and then version-controlled files), and possibly include logic to simplify to a single -I instead of two when doing in-tree builds? it does not make sense to include them with ' - doing so is merely more work for preprocessor and a source or errors if a stale file happens to exist in the source directory.

Re: Qemu-devel Small Fix For Qemu Apic For Mac Download

This changes include directives for all generated files, across the tree. The idea is to avoid sending a huge amount of email. But when merging, the changes will be split with one commit per file, e.g. For ease of bisect in case of build failures, and to ease merging. Note that should some generated files be missed by this tree-wide refactoring, it isn't a big deal - this merely maintains the status quoand this can be addressed by a separate patch on top. I'm not sure I'm a fan of this patch yet, if there may be other alternatives that solve the real issue of stale generated files breaking incremental builds.

March 20, 2018, 4:33 p.m. UTC Am um 02:54 schrieb Michael S. Tsirkin: QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'. However this rule actually does not make sense and creates issues for when the included file is generated. In C, include 'file' means look in current directorythen on include search path. Current directory here means the source file directory.

By comparison include means look on include search path. Hello Michael, the compiler (or to be more precise the preprocessor) works as you describe it, so technically all include files which are only found by searching the include paths would be found faster with than with ': the unsuccessful search relative to the source file directory would be omitted. Practically this will not save much build time because of caching effects. So the suggested change is not required to get faster build speed.

Using for system include files and ' for local include files is a convention, and as far as I know most projects adhere to that convention. So does QEMU currently.

'user' and 'system' means the different forms how include statements are written. QEMU still seems to use -MMD: rules.mak:QEMUDGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(.F).d Other tools like static code analysers could restrict their warning and error messages to user include files and ignore problems in system include files. Very large projects often split in sub projects, maybe one of them describing the API.

Then that API headers are similar to system headers and can be included using, although they still belong to the same larger project. Do we have a stable QEMU API described in a (small) number of include files which typically do not change? If yes, then those include files could be included using because we don't need them in dependency lists or in static code analysis reports. For all other QEMU include files, I'd stick to using '. Regards Stefan.

March 20, 2018, 4:40 p.m. UTC On Tue, Mar 20, 2018 at 11:12:00AM -0500, Eric Blake wrote: On 08:54 PM, Michael S. Tsirkin wrote: QEMU coding style at the moment asks for all non-system include files to be used with #include 'foo.h'. I'm replying without having read the rest of the thread, so bear with me if I repeat some of the other comments that have already been made And Markus even just did a cleanup along those lines. However this rule actually does not make sense and creates issues for when the included file is generated.

In C, include 'file' means look in current directorythen on include search path. Current directory here means the source file directory. By comparison include means look on include search path.

It's also nice when 'file' means file belonging to our project, and means 3rd-party file. So we have to choose which semantics are easier; perhaps better Makefile rules that prevent us from seeing stale files is a better solution than figuring out which files are generated. That's what I've attempted here: Regards, Daniel. March 20, 2018, 5:10 p.m. UTC On Tue, Mar 20, 2018 at 05:33:42PM +0100, Stefan Weil wrote: Using for system include files and ' for local include files is a convention, and as far as I know most projects adhere to that convention. So does QEMU currently.

Such conventions are not only important for humans, but also for tools. There are more tools than the C preprocessor which handle and ' differently. For example the GNU compiler uses -MD or -MMD to automatically generate dependency rules for make. While -MD generates dependencies to all include files, -MMD does so only for user include files, but not for system include files. 'user' and 'system' means the different forms how include statements are written. QEMU still seems to use -MMD: rules.mak:QEMUDGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(.F).d To my knowledge, and according to my limited testing, system headers in this context means the default ones not supplied with -I.

If I had to guess, that is the definition most other tools are likely to use. Other tools like static code analysers could restrict their warning and error messages to user include files and ignore problems in system include files.

Could you give some exacmples of tools like that? IMHO they would not work correctly if they did not treat include directives the way compiler does. C standard is pretty explicit that the only difference is extra directories searched: A preprocessing directive of the form # include 'q-char-sequence' new-line causes the replacement of that directive by the entire contents of the source file identified by the specified sequence between the ' delimiters. The named source file is searched for in an implementation-defined manner. If this search is not supported, or if the search fails, the directive is reprocessed as if it read # include new-line with the identical contained sequence (including characters, if any) from the original directive. Very large projects often split in sub projects, maybe one of them describing the API. Then that API headers are similar to system headers and can be included using, although they still belong to the same larger project.

Do we have a stable QEMU API described in a (small) number of include files which typically do not change? If yes, then those include files could be included using because we don't need them in dependency lists or in static code analysis reports. For all other QEMU include files, I'd stick to using '.

Regards Stefan Most people know that system headers are the ones in /usr/include The distinction that they are pulled in with include ' is a QEMU construct. If we want to be able to distinguish between internal and external headers, the standard way to do it in C is by prefixing the names with qemu/ qemu- or qemu. In fact we kind of already do this - if you see a name with a slash in there you can be pretty sure it's internal to qemu. Exceptions are elf.h glib-compat.h and the generated trace.h. Let's mv include/. include/qemu/?

Re Qemu-devel Small Fix For Qemu Apic For Mac

March 20, 2018, 5:12 p.m. UTC On Tue, Mar 20, 2018 at 02:54:37PM +0100, Max Reitz wrote: But I guess the main advantage with using this rule I see is that it's better for people reading the code. It's just nice to know whether a file belongs to qemu or not by just looking at the #include statement.

(Note that this implies that it is indeed more difficult to determine whether a header belongs to qemu than whether it sits in the same directory as the C file, though!) So I think the old (current) rule is better for reading code, Michael's rule would be better for writing code. I think reading code is what should be easier. How about prefixing all internal headers with qemu/? That's a way to avoid namespace collisions that is actually standard. March 20, 2018, 5:34 p.m.

UTC On Tue, Mar 20, 2018 at 07:10:42PM +0200, Michael S. Tsirkin wrote: On Tue, Mar 20, 2018 at 05:33:42PM +0100, Stefan Weil wrote: Using for system include files and ' for local include files is a convention, and as far as I know most projects adhere to that convention. So does QEMU currently. Such conventions are not only important for humans, but also for tools. There are more tools than the C preprocessor which handle and ' differently. For example the GNU compiler uses -MD or -MMD to automatically generate dependency rules for make. While -MD generates dependencies to all include files, -MMD does so only for user include files, but not for system include files.

'user' and 'system' means the different forms how include statements are written. QEMU still seems to use -MMD: rules.mak:QEMUDGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(.F).d To my knowledge, and according to my limited testingsystem headers in this context means the default ones not supplied with -I. GCC's definition of system header is here: Regards, Daniel.

March 20, 2018, 5:36 p.m. UTC On Tue, Mar 20, 2018 at 05:33:42PM +0100, Stefan Weil wrote: Very large projects often split in sub projects, maybe one of them describing the API. Then that API headers are similar to system headers and can be included using, although they still belong to the same larger project. Do we have a stable QEMU API described in a (small) number of include files which typically do not change? If yes, then those include files could be included using because we don't need them in dependency lists or in static code analysis reports. QEMU doesn't have anything we'd call a stable API at the source level, anything is subject to change at any time, and often does. Regards, Daniel.

March 21, 2018, 1:24 p.m. UTC On Wed, Mar 21, 2018 at 02:15:20PM +0100, Stefan Weil wrote: Am um 14:08 schrieb Michael S. Tsirkin: It still leaves us with a host of problems e.g. The problem of stale headers in the source directory. There have already been suggestions in the past to forbid in-tree builds.

Would it help if configure would refuse to run from the root source directory? At least.gitignore could be much smaller then. Stefan I think I have a better idea, not relying on external tools. Will post a proposal shortly.

Installing from a repository (Unix) Most GNU/Linux distributions have package repositories that carry precompiled binaries of QEMU. This is a much simpler installation process when compared to. It's often best to use these repositories when installing QEMU, as you can be confident that it will install and run without problems. This table outlines the minimum commands to perform in order to install QEMU from your repository. Distribution Install command Fedora yum install qemu Debian apt install qemu qemu-kvm libvirt-bin SUSE yast -i qemu Gentoo emerge -av app-emulation/qemu Arch sudo pacman -S qemu Mac (Homebrew) brew install qemu If in the event that you can't install QEMU from a package repository, you can go to the QEMU website to and follow the instructions given.

Installing on Windows If you're hesitant to work with the command-line, there's a GUI front-end called. However, this program has been abandoned. Its last release (7.0) was in 2010, the creator's website has disappeared, and it doesn't appear to have its source available; this means that (should you use it) you would be stuck with the very old version of QEMU it provides (0.11), causing conflicts with newer builds severely. And if you're looking for an x86 virtualization tool that has a graphical interface, then is recommended. If you're comfortable with the command-line interface, there are two builders providing downloads of QEMU for use with the command line. Compiles QEMU with Cygwin, and they warn that you need to download MinGW packages as a result. Is as recent as possible with his builds and doesn't require Cygwin.

Re: Qemu-devel Small Fix For Qemu Apic For Mac Mac

Building from source The most surefire way to get QEMU working is to build it from its source. To do so, make sure you have git (and if you're on Windows, get ), and enter the following commands into a terminal/command-line environment:.

git clone. cd qemu. git submodule init. git submodule update -recursive. git submodule status -recursive. git checkout stable-2.9. mkdir build.

cd build./configure. make After QEMU is installed, you may find platform-specific instructions in.

Native x86 acceleration with KVM QEMU by itself does a lot of emulation even when running on guest-compatible hardware. To make it perform better, QEMU has a kernel module called that allows much of the guest OS's code to run directly on the host processor when running on x86 or x86-64 processors with under GNU/Linux.

For example, if the host is x86 GNU/Linux and the guest is Windows XP, then KVM can run most of the Windows XP code directly on the processor without emulation. QEMU-KVM requires a GNU/Linux or BSD Unix host, and a CPU with virtualisation extensions - either Intel VT or AMD-V. To determine whether your CPU has this support on GNU/Linux, run the following command from a shell: egrep '(vmx svm)' /proc/cpuinfo If you get nothing back, your CPU does not support the required virtualisation extensions.

Many modern GNU/Linux distros have simple installation processes based on package repositories. It is often best to use the repository approach for installing QEMU-KVM, as you can be confident that QEMU-KVM will just install and run. Here are some common GNU/Linux distros and their QEMU-KVM install commands: Distribution Install command Fedora or yum install qemu-kvm Debian apt install kvm qemu-kvm libvirt-bin SUSE yast -i kvm More details are available on the. If you can't install QEMU-KVM from a package repository, go to the QEMU-KVM website and the latest source code and follow the instructions given.

↑ Also valid for other RPM-based distributions (e.g. RedHat, CentOS). ↑ Also valid for other dpkg-based distributions (e.g. Ubuntu, Mepis, Mint).

↑ apt-get works the same as apt in newer releases. This is the git link provided by QEMU's download page. To prevent the problem that. But don't put 2.9 if it's no longer the current stable version. If the current is higher, change it accordingly. If you want to build QEMU only for a specific target (say, only for x86 which is 32-bit) instead of for all targets, use./configure -target-list=i386-softmmu instead.