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    SubjectRE: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency from the hypervisor
    Date


    > -----Original Message-----
    > From: Gleb Natapov [mailto:gleb@redhat.com]
    > Sent: Tuesday, September 17, 2013 10:44 PM
    > To: KY Srinivasan
    > Cc: H. Peter Anvin; x86@kernel.org; gregkh@linuxfoundation.org; linux-
    > kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
    > apw@canonical.com; jasowang@redhat.com; tglx@linutronix.de;
    > JBeulich@suse.com; bp@alien8.de
    > 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


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