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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] svm: Do not intercept RDTCS(P) when TSC scaling is supported by hardware
On 20/04/2012 09:15, "Jan Beulich" <JBeulich@xxxxxxxx> wrote: >> svm: Do not intercept RDTCS(P) when TSC scaling is supported by hardware >> >> When running in TSC_MODE_ALWAYS_EMULATE mode on processors that support >> TSC scaling we don't need to intercept RDTSC/RDTSCP instructions. > > While the patch itself looks fine, I'm having difficulty to connect the > mentioning of TSC_MODE_ALWAYS_EMULATE to it - afaics all modes > are affected as long as they result in d->arch.vtsc to be set. I think the real point of this patch is they *never* want to trap and emulate RDTSC on these newer processors. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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