lkml.org 
[lkml]   [2013]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency from the hypervisor
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


\
 
 \ /
  Last update: 2013-09-27 17:21    [W:0.184 / U:0.936 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site