From: Andrea Parri <parri.andrea@xxxxxxxxx> Sent: Thursday, October 3, 2019 8:52 AM > > If the hardware supports TSC scaling, Hyper-V will set bit 15 of the > HV_PARTITION_PRIVILEGE_MASK in guest VMs with a compatible Hyper-V > configuration version. Bit 15 corresponds to the > AccessTscInvariantControls privilege. If this privilege bit is set, > guests can access the HvSyntheticInvariantTscControl MSR: guests can > set bit 0 of this synthetic MSR to enable the InvariantTSC feature. > After setting the synthetic MSR, CPUID will enumerate support for > InvariantTSC. > > Signed-off-by: Andrea Parri <parri.andrea@xxxxxxxxx> > --- > arch/x86/include/asm/hyperv-tlfs.h | 5 +++++ > arch/x86/kernel/cpu/mshyperv.c | 7 ++++++- > 2 files changed, 11 insertions(+), 1 deletion(-) > As noted in a separate email, this patch is standalone, not 1 of 2 as indicated in the subject line. Modulo that, Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
