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From:   "Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
To:     KY Srinivasan <kys@microsoft.com>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        "marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com>,
        Stephen Hemminger <sthemmin@microsoft.com>
Subject: RE: [PATCH char-misc 1/2] Drivers: hv: vmbus: Remove x86 MSR refs in
 arch independent code
Thread-Topic: [PATCH char-misc 1/2] Drivers: hv: vmbus: Remove x86 MSR refs in
 arch independent code
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Date:   Sat, 12 May 2018 12:55:41 +0000
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> > -#define hv_init_timer(timer, tick) wrmsrl(timer, tick)
> > -#define hv_init_timer_config(config, val) wrmsrl(config, val)
> > +#define hv_init_timer(timer, tick) \
> > +	wrmsrl(HV_X64_MSR_STIMER0_COUNT + (2*timer), tick)
> > +#define hv_init_timer_config(timer, val) \
> > +	wrmsrl(HV_X64_MSR_STIMER0_CONFIG + (2*timer), val)
>
> Why are we stepping in units of 2?
>=20
> K. Y

The register addresses for  the *_CONFIG and *_COUNT registers
are interleaved.  From hyperv-tlfs.h:

#define HV_X64_MSR_STIMER0_CONFIG               0x400000B0
#define HV_X64_MSR_STIMER0_COUNT                0x400000B1
#define HV_X64_MSR_STIMER1_CONFIG               0x400000B2
#define HV_X64_MSR_STIMER1_COUNT                0x400000B3
#define HV_X64_MSR_STIMER2_CONFIG               0x400000B4
#define HV_X64_MSR_STIMER2_COUNT                0x400000B5
#define HV_X64_MSR_STIMER3_CONFIG               0x400000B6
#define HV_X64_MSR_STIMER3_COUNT                0x400000B7

Michael