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0cffce56ae
The LMB DRC release callback, spapr_lmb_release(), uses an opaque parameter, a sPAPRDIMMState struct that stores the current LMBs that are allocated to a DIMM (nr_lmbs). After each call to this callback, the nr_lmbs is decremented by one and, when it reaches zero, the callback proceeds with the qdev calls to hot unplug the LMB. Using drc->detach_cb_opaque is problematic because it can't be migrated in the future DRC migration work. This patch makes the following changes to eliminate the usage of this opaque callback inside spapr_lmb_release: - sPAPRDIMMState was moved from spapr.c and added to spapr.h. A new attribute called 'addr' was added to it. This is used as an unique identifier to associate a sPAPRDIMMState to a PCDIMM element. - sPAPRMachineState now hosts a new QTAILQ called 'pending_dimm_unplugs'. This queue of sPAPRDIMMState elements will store the DIMM state of DIMMs that are currently going under an unplug process. - spapr_lmb_release() will now retrieve the nr_lmbs value by getting the correspondent sPAPRDIMMState. A helper function called spapr_dimm_get_address was created to fetch the address of a PCDIMM device inside spapr_lmb_release. When nr_lmbs reaches zero and the callback proceeds with the qdev hot unplug calls, the sPAPRDIMMState struct is removed from spapr->pending_dimm_unplugs. After these changes, the opaque argument for spapr_lmb_release is now unused and is passed as NULL inside spapr_del_lmbs. This and the other opaque arguments can now be safely removed from the code. As an additional cleanup made by this patch, the spapr_del_lmbs function was merged with spapr_memory_unplug_request. The former was being called only by the latter and both were small enough to fit one single function. Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com> [dwg: Minor stylistic cleanups] Signed-off-by: David Gibson <david@gibson.dropbear.id.au> |
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| LICENSE | ||
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| README | ||
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QEMU README
===========
QEMU is a generic and open source machine & userspace emulator and
virtualizer.
QEMU is capable of emulating a complete machine in software without any
need for hardware virtualization support. By using dynamic translation,
it achieves very good performance. QEMU can also integrate with the Xen
and KVM hypervisors to provide emulated hardware while allowing the
hypervisor to manage the CPU. With hypervisor support, QEMU can achieve
near native performance for CPUs. When QEMU emulates CPUs directly it is
capable of running operating systems made for one machine (e.g. an ARMv7
board) on a different machine (e.g. an x86_64 PC board).
QEMU is also capable of providing userspace API virtualization for Linux
and BSD kernel interfaces. This allows binaries compiled against one
architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a
different architecture ABI (e.g. the Linux x86_64 ABI). This does not
involve any hardware emulation, simply CPU and syscall emulation.
QEMU aims to fit into a variety of use cases. It can be invoked directly
by users wishing to have full control over its behaviour and settings.
It also aims to facilitate integration into higher level management
layers, by providing a stable command line interface and monitor API.
It is commonly invoked indirectly via the libvirt library when using
open source applications such as oVirt, OpenStack and virt-manager.
QEMU as a whole is released under the GNU General Public License,
version 2. For full licensing details, consult the LICENSE file.
Building
========
QEMU is multi-platform software intended to be buildable on all modern
Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety
of other UNIX targets. The simple steps to build QEMU are:
mkdir build
cd build
../configure
make
Additional information can also be found online via the QEMU website:
http://qemu-project.org/Hosts/Linux
http://qemu-project.org/Hosts/Mac
http://qemu-project.org/Hosts/W32
Submitting patches
==================
The QEMU source code is maintained under the GIT version control system.
git clone git://git.qemu-project.org/qemu.git
When submitting patches, the preferred approach is to use 'git
format-patch' and/or 'git send-email' to format & send the mail to the
qemu-devel@nongnu.org mailing list. All patches submitted must contain
a 'Signed-off-by' line from the author. Patches should follow the
guidelines set out in the HACKING and CODING_STYLE files.
Additional information on submitting patches can be found online via
the QEMU website
http://qemu-project.org/Contribute/SubmitAPatch
http://qemu-project.org/Contribute/TrivialPatches
Bug reporting
=============
The QEMU project uses Launchpad as its primary upstream bug tracker. Bugs
found when running code built from QEMU git or upstream released sources
should be reported via:
https://bugs.launchpad.net/qemu/
If using QEMU via an operating system vendor pre-built binary package, it
is preferable to report bugs to the vendor's own bug tracker first. If
the bug is also known to affect latest upstream code, it can also be
reported via launchpad.
For additional information on bug reporting consult:
http://qemu-project.org/Contribute/ReportABug
Contact
=======
The QEMU community can be contacted in a number of ways, with the two
main methods being email and IRC
- qemu-devel@nongnu.org
http://lists.nongnu.org/mailman/listinfo/qemu-devel
- #qemu on irc.oftc.net
Information on additional methods of contacting the community can be
found online via the QEMU website:
http://qemu-project.org/Contribute/StartHere
-- End