On Tue, Sep 03, K. Y. Srinivasan wrote: > Hyper-V supports a mechanism for retrieving the local APIC frequency.Use this > and bypass > the calibration code in the kernel. This would allow us to boot the Linux > kernel as a > "modern VM" on Hyper-V where many of the legacy devices (such as PIT) are not > emulated.
> + if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) { > + /* > + * Get the APIC frequency. > + */ > + rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency); > + hv_lapic_frequency /= HZ; This leads to build errors on 32bit: linux-3.12-rc2/arch/x86/kernel/cpu/mshyperv.c:88: undefined reference to `__udivdi3' Up to now I have only tested on 64bit, sorry for that. Olaf -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/