x86/hyperv: Read TSC frequency from a synthetic MSR

It was found that SMI_TRESHOLD of 50000 is not enough for Hyper-V
guests in nested environment and falling back to counting jiffies
is not an option for Gen2 guests as they don't have PIT. As Hyper-V
provides TSC frequency in a synthetic MSR we can just use this information
instead of doing a error prone calibration.

Reported-and-tested-by: Ladi Prosek <[email protected]>
Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: Jork Loeser <[email protected]>
Cc: [email protected]
Cc: "K. Y. Srinivasan" <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]

0 files changed, 0 insertions, 0 deletions