> -----Original Message----- > From: Gleb Natapov [mailto:gleb@xxxxxxxxxx] > Sent: Tuesday, September 17, 2013 10:44 PM > To: KY Srinivasan > Cc: H. Peter Anvin; x86@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; > apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx; tglx@xxxxxxxxxxxxx; > 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 17, 2013 at 07:53:36PM +0000, KY Srinivasan wrote: > > > > Thanks Gleb. Here is the link for the latest Hyper-V specification: > > > > http://www.microsoft.com/en-us/download/details.aspx?id=39289 > > > > > > > > This spec talks about how migration is handled with regards to TSC. > > > > > > > All I can see is "15.4.3 Partition Reference TSC Mechanism". I see > > > nothing about HV_X64_MSR_TSC_FREQUENCY specifically. To access this MSR > > > a partition needs AccessFrequencyMsrs privilege, may be partition that > > > cab be migrated does not have this privilege? > > > > If you use the MSR to read the TSC frequency, then indeed when you migrate > then there > > is no guarantee that the TSC frequency won't change when you migrate. The > approach > > described in section 15.4.3 is the preferred approach that can accommodate > migration. > > > Thanks. Peter, Please let me know if there are other issues I need to address here. Now that Dmitry has queued up the Hyper-V keyboard driver, with this patch we can fully support Linux on our uefi firmware. Regards, K. Y _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
