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[Qemu-devel] [PATCH 0/3]: Introduce multi-core and multi-thread support

From: Andre Przywara
Subject: [Qemu-devel] [PATCH 0/3]: Introduce multi-core and multi-thread support for guests
Date: Wed, 19 Aug 2009 15:42:39 +0200


currently QEMU's -smp <n> option only injects multiple CPU sockets into
the guest. Some operating systems(TM) restrict the number of "real" CPU
sockets for licensing reasons, but allow multi-core CPUs.
This patch extends the -smp option to let the user specify a topology:
-smp <smp_value>[,cores=<nrcores>][,threads=<nrthreads>]
The <smp_value> is the legacy number of virtual CPUs QEMU emulates. If any
of the cores, threads or sockets option is given, this value can be omitted.
Missing values are calculated to fulfill:
smp_value = nrsockets * nrcores * nrthreads
Where in doubt it will favor multiple sockets over multiple cores over
multiple threads (to mimic the current behavior).
The entered values will be propagated to the CPUID emulation, where the
corresponding bits will be set (both for Intel and AMD processors).
These patches are againt QEMU HEAD, but should apply against qemu-kvm, too.

Please review, comment and apply!


Signed-off-by: Andre Przywara <address@hidden>

Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448 3567 12
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