Re: [PATCH 2/2] kvm-kmod: Document the build process
Dietmar Maurer wrote:
-Original Message-
From: kvm-ow...@vger.kernel.org [mailto:kvm-ow...@vger.kernel.org] On
Behalf Of Wolfgang Mauerer
Sent: Mittwoch, 21. Oktober 2009 16:21
To: Dietmar Maurer
Cc: kvm@vger.kernel.org; Kiszka, Jan
Subject: Re: [PATCH 2/2] kvm-kmod: Document the build process
Hio,
Dietmar Maurer wrote:
+ Before the kvm module can be built, the linux submodule must be
initialised
+ and populated. The required sequence of commands is
+
+ git submodule init
+ git submodule update
+ ./configure
+ make sync
+ make
+
+ Notice that you can also specify an existing Linux tree for the
+ synchronisation stage by using
+
+ make sync LINUX=/path/to/tree
I always get errors when i try to sync (with our Linux-2.6.24 tree)
./configure --kerneldir=${TOP}/linux-2.6.24-openvz
make sync LINUX=${TOP}/linux-2.6.24-openvz
make[1]: Entering directory `/a/dir/kvm-kmod-2.6.30.1'
./sync kvm-kmod-2.6.30.1
Traceback (most recent call last):
File ./sync, line 210, in module
header_sync(arch)
File ./sync, line 181, in header_sync
hack(T, 'x86', 'include/linux/kvm.h')
File ./sync, line 127, in hack
_hack(T + '/' + file, arch)
File ./sync, line 118, in _hack
data = file(fname).read()
IOError: [Errno 2] No such file or directory:
'header/include/linux/kvm.h'
make[1]: *** [sync] Error 1
Any idea whats wrong?
Do you have a checked out Linux tree in linux-2.6/?
Sorry, seem I am confused. You wrote
+ make sync LINUX=/path/to/tree
So why do I need another linux tree? Can't we fix the 'sync' script?
There is nothing to fix. The sync script takes the KVM kernel module
sources from a recent kernel A and patch them so that kvm-kmod can build
them for an ancient kernel B.
Now you have two options where this kernel A could be located on sync:
by default (LINUX unset), it is in kvm-kmod/linux-2.6 (that git
submodule). Or you define a different local tree via
LINUX=/path/to/kernel/A - like above.
Jan
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RE: [PATCH 2/2] kvm-kmod: Document the build process
+ Before the kvm module can be built, the linux submodule must be
initialised
+ and populated. The required sequence of commands is
+
+ git submodule init
+ git submodule update
+ ./configure
+ make sync
+ make
+
+ Notice that you can also specify an existing Linux tree for the
+ synchronisation stage by using
+
+ make sync LINUX=/path/to/tree
I always get errors when i try to sync (with our Linux-2.6.24 tree)
./configure --kerneldir=${TOP}/linux-2.6.24-openvz
make sync LINUX=${TOP}/linux-2.6.24-openvz
make[1]: Entering directory `/a/dir/kvm-kmod-2.6.30.1'
./sync kvm-kmod-2.6.30.1
Traceback (most recent call last):
File ./sync, line 210, in module
header_sync(arch)
File ./sync, line 181, in header_sync
hack(T, 'x86', 'include/linux/kvm.h')
File ./sync, line 127, in hack
_hack(T + '/' + file, arch)
File ./sync, line 118, in _hack
data = file(fname).read()
IOError: [Errno 2] No such file or directory: 'header/include/linux/kvm.h'
make[1]: *** [sync] Error 1
Any idea whats wrong?
- Dietmar
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Re: [PATCH 2/2] kvm-kmod: Document the build process
Hio,
Dietmar Maurer wrote:
+ Before the kvm module can be built, the linux submodule must be
initialised
+ and populated. The required sequence of commands is
+
+ git submodule init
+ git submodule update
+ ./configure
+ make sync
+ make
+
+ Notice that you can also specify an existing Linux tree for the
+ synchronisation stage by using
+
+ make sync LINUX=/path/to/tree
I always get errors when i try to sync (with our Linux-2.6.24 tree)
./configure --kerneldir=${TOP}/linux-2.6.24-openvz
make sync LINUX=${TOP}/linux-2.6.24-openvz
make[1]: Entering directory `/a/dir/kvm-kmod-2.6.30.1'
./sync kvm-kmod-2.6.30.1
Traceback (most recent call last):
File ./sync, line 210, in module
header_sync(arch)
File ./sync, line 181, in header_sync
hack(T, 'x86', 'include/linux/kvm.h')
File ./sync, line 127, in hack
_hack(T + '/' + file, arch)
File ./sync, line 118, in _hack
data = file(fname).read()
IOError: [Errno 2] No such file or directory: 'header/include/linux/kvm.h'
make[1]: *** [sync] Error 1
Any idea whats wrong?
Do you have a checked out Linux tree in linux-2.6/?
Currently, the linux-2.6 submodule seems to reference
a commit that is not present in the standard kvm
repo, so I assume that git submodule update
has failed for you. For now, you can fix this by
using git checkout in linux-2.6/
Btw.: Wrt. git sync, I've also updated to README
a bit to the two different kernel trees that come into
play. Comments?
Jan: I think the bogous reference is a leftover
from the tree that you've added as submodule; after
my patch to use Avi's tree, the information might be
out of sync.
Best, Wolfgang
diff --git a/README b/README
index 40a72d3..34cc51a 100644
--- a/README
+++ b/README
@@ -1,16 +1,21 @@
Building the KVM kernel module is performed differently depending on whether
you are working from a clone of the git repository or from a source release.
+Notice that two kernels are involved: One from which the KVM sources
+are taken (kernel A), and one for which the module is built (kernel B).
+For out-of-tree module builds, it is well possible that kernel A is more
+recent than kernel B.
- To build from a release, simply use ./configure (possibly with any
arguments that are required for your setup, see ./configure --help)
- and make.
+ and make. The kernel specified with --kerneldir refers to kernel B,
+ that is, the kernel for which the module is built.
- Building from a cloned git repository requires a kernel tree with the main
- kvm sources that is included as a submodule in the linux-2.6/ directory. By
- default, the KVM development tree on git.kernel.org is used, but you can
- change this setting in .gitmodules
+ kvm sources (kernel A) that is included as a submodule in the linux-2.6/
+ directory. By default, the KVM development tree on git.kernel.org is used,
+ but you can change this setting in .gitmodules
- Before the kvm module can be built, the linux submodule must be initialised
+ Before the kvm module can be built, the linux submodule must be initialised
and populated. The required sequence of commands is
git submodule init
@@ -24,3 +29,5 @@ you are working from a clone of the git repository or from a source release.
make sync LINUX=/path/to/tree
+ The synchronisation stage refers to kernel A, that is, the kernel
+ from which the KVM sources are taken.
