diff options
Diffstat (limited to 'documentation/dev-manual/dev-manual-qemu.xml')
| -rw-r--r-- | documentation/dev-manual/dev-manual-qemu.xml | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/documentation/dev-manual/dev-manual-qemu.xml b/documentation/dev-manual/dev-manual-qemu.xml index f4719ebc3cb..4e7b5de4e80 100644 --- a/documentation/dev-manual/dev-manual-qemu.xml +++ b/documentation/dev-manual/dev-manual-qemu.xml @@ -343,6 +343,40 @@ </para> </section> + <section id='qemu-kvm-cpu-compatibility'> + <title>QEMU CPU Compatibility Under KVM</title> + + <para> + By default, the QEMU build compiles for and targets 64-bit and x86 + <trademark class='registered'>Intel</trademark> <trademark class='trademark'>Core</trademark>2 + Duo processors and 32-bit x86 + <trademark class='registered'>Intel</trademark> <trademark class='registered'>Pentium</trademark> + II processors. + QEMU builds for and targets these CPU types because they display + a broad range of CPU feature compatibility with many commonly + used CPUs. + </para> + + <para> + Despite this broad range of compatibility, the CPUs could support + a feature that your host CPU does not support. + Although this situation is not a problem when QEMU uses software + emulation of the feature, it can be a problem when QEMU is + running with KVM enabled. + Specifically, software compiled with a certain CPU feature crashes + when run on a CPU under KVM that does not support that feature. + To work around this problem, you can override QEMU's runtime CPU + setting by changing the <filename>QB_CPU_KVM</filename> + variable in <filename>qemuboot.conf</filename> in the + <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory's</ulink> + <filename>deploy/image</filename> directory. + This setting specifies a <filename>-cpu</filename> option + passed into QEMU in the <filename>runqemu</filename> script. + Running <filename>qemu -cpu help</filename> returns a list of + available supported CPU types. + </para> + </section> + <section id='qemu-dev-performance'> <title>QEMU Performance</title> |