> -----Original Message----- > From: Olaf Hering [mailto:olaf@xxxxxxxxx] > Sent: Friday, September 27, 2013 8:10 AM > To: KY Srinivasan > Cc: x86@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devel@xxxxxxxxxxxxxxxxxxxxxx; apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx; > tglx@xxxxxxxxxxxxx; hpa@xxxxxxxxx; JBeulich@xxxxxxxx; bp@xxxxxxxxx > Subject: Re: [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. Thanks Olaf. I am travelling currently; I will fix it when I get back (early next week). K. Y > > > Olaf _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
