[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen cpufreq support status: how to notify hypervisor of frequency change?
On 11 Apr 2006, at 01:05, Matt T. Yourst wrote: Note that I only implemented this for powernow-k8 right now, since that's the only hardware I could test it on. It's very obvious how to adapt it to the other cpufreq drivers, by just replacing rdmsr and wrmsr with the Xen wrapperversions I provided, and adding in the setcpufreq hypercall at the end. All this stuff should be done by emulating the MSR writes in emulate_privileged_op() in arch/x86/traps.c. This will avoid any modification of Linux at all. Currently there's only simple filtering of MSR write attempts, but picking up on cpu-freq MSR accesses on e.g., AMD systems and also resync'ing the local clock would not be difficult. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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