Re: [RFC PATCH] hyperv-tlfs: Change shared HV_REGISTER_* defines to HV_SYNTHETIC_REG_*

From: Nuno Das Neves
Date: Wed Mar 15 2023 - 18:55:02 EST

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In reply to: Michael Kelley (LINUX): "RE: [RFC PATCH] hyperv-tlfs: Change shared HV_REGISTER_* defines to HV_SYNTHETIC_REG_*"
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On 3/13/2023 6:56 PM, Michael Kelley (LINUX) wrote:
> From: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx> Sent: Monday, March 13, 2023 2:11 PM
>>
>> On 3/10/2023 11:30 AM, Michael Kelley (LINUX) wrote:
>>> From: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx> Sent: Tuesday, March 7,
>> 2023 1:13 PM
>>>>
>>>> In x86 hyperv-tlfs, HV_REGISTER_ prefix is used to indicate MSRs
>>>> accessed via rdmsrl/wrmsrl. But in ARM64, HV_REGISTER_ instead indicates
>>>> VP registers accessed via get/set vp registers hypercall.
>>>>
>>>> This is due to HV_REGISTER_* names being used by hv_set/get_register,
>>>> with the arch-specific version delegating to the appropriate mechanism.
>>>>
>>>> The problem is, using prefix HV_REGISTER_ for MSRs will conflict with
>>>> VP registers when they are introduced for x86 in future.
>>>>
>>>> This patch solves the issue by:
>>>>
>>>> 1. Defining all the x86 MSRs with a consistent prefix: HV_X64_MSR_.
>>>> This is so HV_REGISTER_ can be reserved for VP registers.
>>>>
>>>> 2. Change the non-arch-specific alias used by hv_set/get_register to
>>>> HV_SYNTHETIC_REG.
>>>
>>> I definitely messed this up when I first did the ARM64 support a
>>> few years back. :-( This is a necessary fix.
>>>
>>> What about keeping HV_REGISTER_ as the prefix for the architecture
>>> independent alias, and creating a new prefix for the Hyper-V register
>>> definition? This would allow the existing hv_get/set_register()
>>> invocations to remain unchanged, and eliminates the code churn
>>> in the arch independent code.
>>>> The HV_X64_MSR_ prefix is definitely good for the MSR addresses,
>>> especially since a lot of definitions that are x86/x64 only are still in use.
>>> Then perhaps use HV_HYP_REG_ or something similar for the Hyper-V
>>> register definition.
>>
>> This could work.
>>
>> Ideally, we would use HV_REGISTER_ for the vp registers as it's a direct match
>> to the name in HyperV e.g. HvRegisterVpIndex-> HV_REGISTER_VP_INDEX
>
> You make a good point.
>
>>
>> However if you think it's better to reduce churn and go with a different
>> name then that's fine by me.
>
> I was specifically thinking about 3 large-ish patch sets for Confidential VMs
> that we have pending. The Confidential VM patches have various changes
> to the synic code in hv.c so it overlaps with your changes to the register
> naming. The Confidential VM patches need to be backported to earlier
> Linux kernel versions, and I was trying to avoid unrelated churn to ease
> the backport process. How urgent is fixing this register naming problem?
> If it could go after the Confidential VM patches, then there's less churn for
> the backports.
>

It is not urgent, but I wanted feedback on the approach because this needs to be
fixed in some way for the /dev/mshv driver which adds all the vp register names,
and I was hoping to use HV_REGISTER_ for those.

> But in the grand scheme of things, we can deal with the churn. It's just
> some manual work that isn't hard. Net, I'm OK with either approach.
>

In that case, I'd prefer to go with my original intention of changing the
meaning of HV_REGISTER_ to be the vp registers, and adding the generic
HV_SYNTHETIC_REG (or a shorter name as below).

But, merging this change can indeed wait - I can include it in the /dev/mshv
patch series. Since that will take some time to review/iterate on, it's likely
this change wouldn't actually be merged for some time.

>>
>> HV_HYP_REG_ is ok, though maybe HV_VP_REG_ is a bit more informative?
>> "VP_REG" indicating it's relevant to HVCALL_GET/SET_VP_REGISTERS.
>
> Yes, HV_VP_REG_ is good as the register prefix if you decide to keep
> HV_REGISTER_ as the architecture independent prefix.
>
>>
>>>
>>> If you don't like that suggestion, I wonder if the HV_SYNTHETIC_REG_
>>> prefix could be shortened to help avoid line length problems. Maybe
>>> HV_SYNREG_ or HV_SYN_REG_ ?

This is a good idea. I'm fine with either, will go with HV_SYN_REG_ if you
don't have a preference.
Do you think it is necessary or worthwhile to also rename hv_get/set_register
to hv_get/set_syn_reg?

>>>>>
>>>> Signed-off-by: Nuno Das Neves <nudasnev@xxxxxxxxxxxxx>
>>>> ---
>>>> arch/arm64/include/asm/hyperv-tlfs.h | 25 +++++
>>>> arch/x86/include/asm/hyperv-tlfs.h | 137 +++++++++++++--------------
>>>> arch/x86/include/asm/mshyperv.h | 8 +-
>>>> arch/x86/kernel/cpu/mshyperv.c | 22 ++---
>>>> drivers/clocksource/hyperv_timer.c | 24 ++---
>>>> drivers/hv/hv.c | 32 +++----
>>>> drivers/hv/hv_common.c | 4 +-
>>>> drivers/hv/vmbus_drv.c | 14 +--
>>>> include/asm-generic/mshyperv.h | 2 +-
>>>> 9 files changed, 146 insertions(+), 122 deletions(-)
>>>>
>>>> diff --git a/arch/arm64/include/asm/hyperv-tlfs.h b/arch/arm64/include/asm/hyperv-
>>>> tlfs.h
>>>> index bc6c7ac934a1..474025eb3d7e 100644
>>>> --- a/arch/arm64/include/asm/hyperv-tlfs.h
>>>> +++ b/arch/arm64/include/asm/hyperv-tlfs.h
>>>> @@ -64,6 +64,31 @@
>>>> #define HV_REGISTER_STIMER0_CONFIG 0x000B0000
>>>> #define HV_REGISTER_STIMER0_COUNT 0x000B0001
>>>>
>>>> +/*
>>>> + * To support non-arch-specific code calling hv_set/get_register:
>>>> + * - On x86, HV_SYNTHETIC_REG_ indicates an MSR accessed via rdmsrl/wrmsrl
>>>> + * - On ARM, HV_SYNTHETIC_REG_ indicates a VP register accessed via hypercall
>>>
>>> Nit: Let's use the full "ARM64" instead of just "ARM" here so that there's no
>>> confusion about whether 32-bit ARM is supported.
>>>
>>
>> Good point
>>
>>>> + */
>>>> +#define HV_SYNTHETIC_REG_VP_INDEX (HV_REGISTER_VP_INDEX)
>>>> +#define HV_SYNTHETIC_REG_TIME_REF_COUNT
>>>> (HV_REGISTER_TIME_REF_COUNT)
>>>> +#define HV_SYNTHETIC_REG_REFERENCE_TSC
>>>> (HV_REGISTER_REFERENCE_TSC)
>>>> +
>>>> +#define HV_SYNTHETIC_REG_STIMER0_CONFIG
>>>> (HV_REGISTER_STIMER0_CONFIG)
>>>> +#define HV_SYNTHETIC_REG_STIMER0_COUNT
>>>> (HV_REGISTER_STIMER0_COUNT)
>>>> +
>>>> +#define HV_SYNTHETIC_REG_SCONTROL (HV_REGISTER_SCONTROL)
>>>> +#define HV_SYNTHETIC_REG_SIEFP (HV_REGISTER_SIEFP)
>>>> +#define HV_SYNTHETIC_REG_SIMP (HV_REGISTER_SIMP)
>>>> +#define HV_SYNTHETIC_REG_EOM (HV_REGISTER_EOM)
>>>> +#define HV_SYNTHETIC_REG_SINT0 (HV_REGISTER_SINT0)
>>>> +
>>>> +#define HV_SYNTHETIC_REG_CRASH_P0 (HV_REGISTER_CRASH_P0)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P1 (HV_REGISTER_CRASH_P1)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P2 (HV_REGISTER_CRASH_P2)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P3 (HV_REGISTER_CRASH_P3)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P4 (HV_REGISTER_CRASH_P4)
>>>> +#define HV_SYNTHETIC_REG_CRASH_CTL (HV_REGISTER_CRASH_CTL)
>>>> +
>>>> union hv_msi_entry {
>>>> u64 as_uint64[2];
>>>> struct {
>>>> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
>>>> index 566ac26239ba..0dbb0218d0fa 100644
>>>> --- a/arch/x86/include/asm/hyperv-tlfs.h
>>>> +++ b/arch/x86/include/asm/hyperv-tlfs.h
>>>> @@ -178,7 +178,7 @@ enum hv_isolation_type {
>>>> #define HV_X64_MSR_HYPERCALL 0x40000001
>>>>
>>>> /* MSR used to provide vcpu index */
>>>> -#define HV_REGISTER_VP_INDEX 0x40000002
>>>> +#define HV_X64_MSR_VP_INDEX 0x40000002
>>>>
>>>> /* MSR used to reset the guest OS. */
>>>> #define HV_X64_MSR_RESET 0x40000003
>>>> @@ -187,10 +187,10 @@ enum hv_isolation_type {
>>>> #define HV_X64_MSR_VP_RUNTIME 0x40000010
>>>>
>>>> /* MSR used to read the per-partition time reference counter */
>>>> -#define HV_REGISTER_TIME_REF_COUNT 0x40000020
>>>> +#define HV_X64_MSR_TIME_REF_COUNT 0x40000020
>>>>
>>>> /* A partition's reference time stamp counter (TSC) page */
>>>> -#define HV_REGISTER_REFERENCE_TSC 0x40000021
>>>> +#define HV_X64_MSR_REFERENCE_TSC 0x40000021
>>>>
>>>> /* MSR used to retrieve the TSC frequency */
>>>> #define HV_X64_MSR_TSC_FREQUENCY 0x40000022
>>>> @@ -205,61 +205,61 @@ enum hv_isolation_type {
>>>> #define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073
>>>>
>>>> /* Define synthetic interrupt controller model specific registers. */
>>>> -#define HV_REGISTER_SCONTROL 0x40000080
>>>> -#define HV_REGISTER_SVERSION 0x40000081
>>>> -#define HV_REGISTER_SIEFP 0x40000082
>>>> -#define HV_REGISTER_SIMP 0x40000083
>>>> -#define HV_REGISTER_EOM 0x40000084
>>>> -#define HV_REGISTER_SINT0 0x40000090
>>>> -#define HV_REGISTER_SINT1 0x40000091
>>>> -#define HV_REGISTER_SINT2 0x40000092
>>>> -#define HV_REGISTER_SINT3 0x40000093
>>>> -#define HV_REGISTER_SINT4 0x40000094
>>>> -#define HV_REGISTER_SINT5 0x40000095
>>>> -#define HV_REGISTER_SINT6 0x40000096
>>>> -#define HV_REGISTER_SINT7 0x40000097
>>>> -#define HV_REGISTER_SINT8 0x40000098
>>>> -#define HV_REGISTER_SINT9 0x40000099
>>>> -#define HV_REGISTER_SINT10 0x4000009A
>>>> -#define HV_REGISTER_SINT11 0x4000009B
>>>> -#define HV_REGISTER_SINT12 0x4000009C
>>>> -#define HV_REGISTER_SINT13 0x4000009D
>>>> -#define HV_REGISTER_SINT14 0x4000009E
>>>> -#define HV_REGISTER_SINT15 0x4000009F
>>>> +#define HV_X64_MSR_SCONTROL 0x40000080
>>>> +#define HV_X64_MSR_SVERSION 0x40000081
>>>> +#define HV_X64_MSR_SIEFP 0x40000082
>>>> +#define HV_X64_MSR_SIMP 0x40000083
>>>> +#define HV_X64_MSR_EOM 0x40000084
>>>> +#define HV_X64_MSR_SINT0 0x40000090
>>>> +#define HV_X64_MSR_SINT1 0x40000091
>>>> +#define HV_X64_MSR_SINT2 0x40000092
>>>> +#define HV_X64_MSR_SINT3 0x40000093
>>>> +#define HV_X64_MSR_SINT4 0x40000094
>>>> +#define HV_X64_MSR_SINT5 0x40000095
>>>> +#define HV_X64_MSR_SINT6 0x40000096
>>>> +#define HV_X64_MSR_SINT7 0x40000097
>>>> +#define HV_X64_MSR_SINT8 0x40000098
>>>> +#define HV_X64_MSR_SINT9 0x40000099
>>>> +#define HV_X64_MSR_SINT10 0x4000009A
>>>> +#define HV_X64_MSR_SINT11 0x4000009B
>>>> +#define HV_X64_MSR_SINT12 0x4000009C
>>>> +#define HV_X64_MSR_SINT13 0x4000009D
>>>> +#define HV_X64_MSR_SINT14 0x4000009E
>>>> +#define HV_X64_MSR_SINT15 0x4000009F
>>>>
>>>> /*
>>>> * Define synthetic interrupt controller model specific registers for
>>>> * nested hypervisor.
>>>> */
>>>> -#define HV_REGISTER_NESTED_SCONTROL 0x40001080
>>>> -#define HV_REGISTER_NESTED_SVERSION 0x40001081
>>>> -#define HV_REGISTER_NESTED_SIEFP 0x40001082
>>>> -#define HV_REGISTER_NESTED_SIMP 0x40001083
>>>> -#define HV_REGISTER_NESTED_EOM 0x40001084
>>>> -#define HV_REGISTER_NESTED_SINT0 0x40001090
>>>> +#define HV_X64_MSR_NESTED_SCONTROL 0x40001080
>>>> +#define HV_X64_MSR_NESTED_SVERSION 0x40001081
>>>> +#define HV_X64_MSR_NESTED_SIEFP 0x40001082
>>>> +#define HV_X64_MSR_NESTED_SIMP 0x40001083
>>>> +#define HV_X64_MSR_NESTED_EOM 0x40001084
>>>> +#define HV_X64_MSR_NESTED_SINT0 0x40001090
>>>>
>>>> /*
>>>> * Synthetic Timer MSRs. Four timers per vcpu.
>>>> */
>>>> -#define HV_REGISTER_STIMER0_CONFIG 0x400000B0
>>>> -#define HV_REGISTER_STIMER0_COUNT 0x400000B1
>>>> -#define HV_REGISTER_STIMER1_CONFIG 0x400000B2
>>>> -#define HV_REGISTER_STIMER1_COUNT 0x400000B3
>>>> -#define HV_REGISTER_STIMER2_CONFIG 0x400000B4
>>>> -#define HV_REGISTER_STIMER2_COUNT 0x400000B5
>>>> -#define HV_REGISTER_STIMER3_CONFIG 0x400000B6
>>>> -#define HV_REGISTER_STIMER3_COUNT 0x400000B7
>>>> +#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
>>>>
>>>> /* Hyper-V guest idle MSR */
>>>> #define HV_X64_MSR_GUEST_IDLE 0x400000F0
>>>>
>>>> /* Hyper-V guest crash notification MSR's */
>>>> -#define HV_REGISTER_CRASH_P0 0x40000100
>>>> -#define HV_REGISTER_CRASH_P1 0x40000101
>>>> -#define HV_REGISTER_CRASH_P2 0x40000102
>>>> -#define HV_REGISTER_CRASH_P3 0x40000103
>>>> -#define HV_REGISTER_CRASH_P4 0x40000104
>>>> -#define HV_REGISTER_CRASH_CTL 0x40000105
>>>> +#define HV_X64_MSR_CRASH_P0 0x40000100
>>>> +#define HV_X64_MSR_CRASH_P1 0x40000101
>>>> +#define HV_X64_MSR_CRASH_P2 0x40000102
>>>> +#define HV_X64_MSR_CRASH_P3 0x40000103
>>>> +#define HV_X64_MSR_CRASH_P4 0x40000104
>>>> +#define HV_X64_MSR_CRASH_CTL 0x40000105
>>>>
>>>> /* TSC emulation after migration */
>>>> #define HV_X64_MSR_REENLIGHTENMENT_CONTROL 0x40000106
>>>> @@ -269,31 +269,30 @@ enum hv_isolation_type {
>>>> /* TSC invariant control */
>>>> #define HV_X64_MSR_TSC_INVARIANT_CONTROL 0x40000118
>>>>
>>>> -/* Register name aliases for temporary compatibility */
>>>> -#define HV_X64_MSR_STIMER0_COUNT HV_REGISTER_STIMER0_COUNT
>>>> -#define HV_X64_MSR_STIMER0_CONFIG HV_REGISTER_STIMER0_CONFIG
>>>> -#define HV_X64_MSR_STIMER1_COUNT HV_REGISTER_STIMER1_COUNT
>>>> -#define HV_X64_MSR_STIMER1_CONFIG HV_REGISTER_STIMER1_CONFIG
>>>> -#define HV_X64_MSR_STIMER2_COUNT HV_REGISTER_STIMER2_COUNT
>>>> -#define HV_X64_MSR_STIMER2_CONFIG HV_REGISTER_STIMER2_CONFIG
>>>> -#define HV_X64_MSR_STIMER3_COUNT HV_REGISTER_STIMER3_COUNT
>>>> -#define HV_X64_MSR_STIMER3_CONFIG HV_REGISTER_STIMER3_CONFIG
>>>> -#define HV_X64_MSR_SCONTROL HV_REGISTER_SCONTROL
>>>> -#define HV_X64_MSR_SVERSION HV_REGISTER_SVERSION
>>>> -#define HV_X64_MSR_SIMP HV_REGISTER_SIMP
>>>> -#define HV_X64_MSR_SIEFP HV_REGISTER_SIEFP
>>>> -#define HV_X64_MSR_VP_INDEX HV_REGISTER_VP_INDEX
>>>> -#define HV_X64_MSR_EOM HV_REGISTER_EOM
>>>> -#define HV_X64_MSR_SINT0 HV_REGISTER_SINT0
>>>> -#define HV_X64_MSR_SINT15 HV_REGISTER_SINT15
>>>> -#define HV_X64_MSR_CRASH_P0 HV_REGISTER_CRASH_P0
>>>> -#define HV_X64_MSR_CRASH_P1 HV_REGISTER_CRASH_P1
>>>> -#define HV_X64_MSR_CRASH_P2 HV_REGISTER_CRASH_P2
>>>> -#define HV_X64_MSR_CRASH_P3 HV_REGISTER_CRASH_P3
>>>> -#define HV_X64_MSR_CRASH_P4 HV_REGISTER_CRASH_P4
>>>> -#define HV_X64_MSR_CRASH_CTL HV_REGISTER_CRASH_CTL
>>>> -#define HV_X64_MSR_TIME_REF_COUNT HV_REGISTER_TIME_REF_COUNT
>>>> -#define HV_X64_MSR_REFERENCE_TSC HV_REGISTER_REFERENCE_TSC
>>>> +/*
>>>> + * To support non-arch-specific code calling hv_set/get_register:
>>>> + * - On x86, HV_SYNTHETIC_REG_ indicates an MSR accessed via rdmsrl/wrmsrl
>>>> + * - On ARM, HV_SYNTHETIC_REG_ indicates a VP register accessed via hypercall
>>>
>>> Same here: "ARM64" instead of "ARM".
>>>
>>
>> Will do
>>
>>>> + */
>>>> +#define HV_SYNTHETIC_REG_VP_INDEX (HV_X64_MSR_VP_INDEX)
>>>> +#define HV_SYNTHETIC_REG_TIME_REF_COUNT
>>>> (HV_X64_MSR_TIME_REF_COUNT)
>>>> +#define HV_SYNTHETIC_REG_REFERENCE_TSC
>>>> (HV_X64_MSR_REFERENCE_TSC)
>>>> +
>>>> +#define HV_SYNTHETIC_REG_STIMER0_CONFIG
>>>> (HV_X64_MSR_STIMER0_CONFIG)
>>>> +#define HV_SYNTHETIC_REG_STIMER0_COUNT
>>>> (HV_X64_MSR_STIMER0_COUNT)
>>>> +
>>>> +#define HV_SYNTHETIC_REG_SCONTROL (HV_X64_MSR_SCONTROL)
>>>> +#define HV_SYNTHETIC_REG_SIEFP (HV_X64_MSR_SIEFP)
>>>> +#define HV_SYNTHETIC_REG_SIMP (HV_X64_MSR_SIMP)
>>>> +#define HV_SYNTHETIC_REG_EOM (HV_X64_MSR_EOM)
>>>> +#define HV_SYNTHETIC_REG_SINT0 (HV_X64_MSR_SINT0)
>>>> +
>>>> +#define HV_SYNTHETIC_REG_CRASH_P0 (HV_X64_MSR_CRASH_P0)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P1 (HV_X64_MSR_CRASH_P1)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P2 (HV_X64_MSR_CRASH_P2)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P3 (HV_X64_MSR_CRASH_P3)
>>>> +#define HV_SYNTHETIC_REG_CRASH_P4 (HV_X64_MSR_CRASH_P4)
>>>> +#define HV_SYNTHETIC_REG_CRASH_CTL (HV_X64_MSR_CRASH_CTL)
>>>>
>>>> /* Hyper-V memory host visibility */
>>>> enum hv_mem_host_visibility {
>>>> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
>>>> index 4c4c0ec3b62e..1afa77ab9a04 100644
>>>> --- a/arch/x86/include/asm/mshyperv.h
>>>> +++ b/arch/x86/include/asm/mshyperv.h
>>>> @@ -224,14 +224,14 @@ extern bool hv_isolation_type_snp(void);
>>>>
>>>> static inline bool hv_is_synic_reg(unsigned int reg)
>>>
>>> Should this function name be changed to hv_is_synic_msr() since
>>> it is based on MSR values and not register values? Argument
>>> name should probably also be "msr", not "reg" to avoid
>>> any confusion.
>>>
>>
>> If we keep the generic prefix as HV_REGISTER, then I suppose it should remain
>> hv_is_synic_reg.
>
> Hmmm, I don't think so. hv_is_synic_reg() is x86 specific code,
> not architecture independent code. And your naming change below
> makes it clear that this code is operating on the MSR values, not
> the register values. As such, the code doesn't work on ARM64.
> If we were to implement the equivalent of Confidential VMs on
> ARM64, the ARM64 implementation of hv_get/set_register() would
> need to call a different function to detect SYNIC regs (not MSRs) that
> need special casing. Same with the caller of hv_is_sint_reg() and
> hv_get_nested_reg(). So I think renaming to hv_is_synic_msr()
> still makes sense. But maybe you have an alternate way of looking
> at it .....
>

No, you're right. I will rename these functions, maybe in a separate commit.

>>
>>>> {
>>>> - return (reg >= HV_REGISTER_SCONTROL) &&
>>>> - (reg <= HV_REGISTER_SINT15);
>>>> + return (reg >= HV_X64_MSR_SCONTROL) &&
>>>> + (reg <= HV_X64_MSR_SINT15);
>>>> }
>>>>
>>>> static inline bool hv_is_sint_reg(unsigned int reg)
>>>
>>> Same here.
>>>
>>>> {
>>>> - return (reg >= HV_REGISTER_SINT0) &&
>>>> - (reg <= HV_REGISTER_SINT15);
>>>> + return (reg >= HV_X64_MSR_SINT0) &&
>>>> + (reg <= HV_X64_MSR_SINT15);
>>>> }
>>>>
>>>> u64 hv_get_register(unsigned int reg);
>>>> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
>>>> index f924a76c6923..7140ee32d7be 100644
>>>> --- a/arch/x86/kernel/cpu/mshyperv.c
>>>> +++ b/arch/x86/kernel/cpu/mshyperv.c
>>>> @@ -45,19 +45,19 @@ struct ms_hyperv_info ms_hyperv;
>>>> static inline unsigned int hv_get_nested_reg(unsigned int reg)
>>>
>>> Same here.
>>>
>>
>> If we keep the generic prefix as HV_REGISTER, then I suppose it should remain
>> hv_get_nested_reg.
>
> As above.
>
>>
>>>> {
>>>> if (hv_is_sint_reg(reg))
>>>> - return reg - HV_REGISTER_SINT0 + HV_REGISTER_NESTED_SINT0;
>>>> + return reg - HV_X64_MSR_SINT0 + HV_X64_MSR_NESTED_SINT0;
>>>>
>>>> switch (reg) {
>>>> - case HV_REGISTER_SIMP:
>>>> - return HV_REGISTER_NESTED_SIMP;
>>>> - case HV_REGISTER_SIEFP:
>>>> - return HV_REGISTER_NESTED_SIEFP;
>>>> - case HV_REGISTER_SVERSION:
>>>> - return HV_REGISTER_NESTED_SVERSION;
>>>> - case HV_REGISTER_SCONTROL:
>>>> - return HV_REGISTER_NESTED_SCONTROL;
>>>> - case HV_REGISTER_EOM:
>>>> - return HV_REGISTER_NESTED_EOM;
>>>> + case HV_X64_MSR_SIMP:
>>>> + return HV_X64_MSR_NESTED_SIMP;
>>>> + case HV_X64_MSR_SIEFP:
>>>> + return HV_X64_MSR_NESTED_SIEFP;
>>>> + case HV_X64_MSR_SVERSION:
>>>> + return HV_X64_MSR_NESTED_SVERSION;
>>>> + case HV_X64_MSR_SCONTROL:
>>>> + return HV_X64_MSR_NESTED_SCONTROL;
>>>> + case HV_X64_MSR_EOM:
>>>> + return HV_X64_MSR_NESTED_EOM;
>>>> default:
>>>> return reg;
>>>> }
>>>> diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
>>>> index c0cef92b12b8..0ab3fbca34c7 100644
>>>> --- a/drivers/clocksource/hyperv_timer.c
>>>> +++ b/drivers/clocksource/hyperv_timer.c
>>>> @@ -81,14 +81,14 @@ static int hv_ce_set_next_event(unsigned long delta,
>>>>
>>>> current_tick = hv_read_reference_counter();
>>>> current_tick += delta;
>>>> - hv_set_register(HV_REGISTER_STIMER0_COUNT, current_tick);
>>>> + hv_set_register(HV_SYNTHETIC_REG_STIMER0_COUNT, current_tick);
>>>> return 0;
>>>> }
>>>>
>>>> static int hv_ce_shutdown(struct clock_event_device *evt)
>>>> {
>>>> - hv_set_register(HV_REGISTER_STIMER0_COUNT, 0);
>>>> - hv_set_register(HV_REGISTER_STIMER0_CONFIG, 0);
>>>> + hv_set_register(HV_SYNTHETIC_REG_STIMER0_COUNT, 0);
>>>> + hv_set_register(HV_SYNTHETIC_REG_STIMER0_CONFIG, 0);
>>>> if (direct_mode_enabled && stimer0_irq >= 0)
>>>> disable_percpu_irq(stimer0_irq);
>>>>
>>>> @@ -119,7 +119,7 @@ static int hv_ce_set_oneshot(struct clock_event_device *evt)
>>>> timer_cfg.direct_mode = 0;
>>>> timer_cfg.sintx = stimer0_message_sint;
>>>> }
>>>> - hv_set_register(HV_REGISTER_STIMER0_CONFIG, timer_cfg.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_STIMER0_CONFIG, timer_cfg.as_uint64);
>>>> return 0;
>>>> }
>>>>
>>>> @@ -387,7 +387,7 @@ static u64 notrace read_hv_clock_tsc(void)
>>>> u64 current_tick = hv_read_tsc_page(hv_get_tsc_page());
>>>>
>>>> if (current_tick == U64_MAX)
>>>> - current_tick = hv_get_register(HV_REGISTER_TIME_REF_COUNT);
>>>> + current_tick = hv_get_register(HV_SYNTHETIC_REG_TIME_REF_COUNT);
>>>>
>>>> return current_tick;
>>>> }
>>>> @@ -408,9 +408,9 @@ static void suspend_hv_clock_tsc(struct clocksource *arg)
>>>> union hv_reference_tsc_msr tsc_msr;
>>>>
>>>> /* Disable the TSC page */
>>>> - tsc_msr.as_uint64 = hv_get_register(HV_REGISTER_REFERENCE_TSC);
>>>> + tsc_msr.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_REFERENCE_TSC);
>>>> tsc_msr.enable = 0;
>>>> - hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_REFERENCE_TSC, tsc_msr.as_uint64);
>>>> }
>>>>
>>>>
>>>> @@ -419,10 +419,10 @@ static void resume_hv_clock_tsc(struct clocksource *arg)
>>>> union hv_reference_tsc_msr tsc_msr;
>>>>
>>>> /* Re-enable the TSC page */
>>>> - tsc_msr.as_uint64 = hv_get_register(HV_REGISTER_REFERENCE_TSC);
>>>> + tsc_msr.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_REFERENCE_TSC);
>>>> tsc_msr.enable = 1;
>>>> tsc_msr.pfn = tsc_pfn;
>>>> - hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_REFERENCE_TSC, tsc_msr.as_uint64);
>>>> }
>>>>
>>>> #ifdef HAVE_VDSO_CLOCKMODE_HVCLOCK
>>>> @@ -456,7 +456,7 @@ static u64 notrace read_hv_clock_msr(void)
>>>> * is set to 0 when the partition is created and is incremented in
>>>> * 100 nanosecond units.
>>>> */
>>>> - return hv_get_register(HV_REGISTER_TIME_REF_COUNT);
>>>> + return hv_get_register(HV_SYNTHETIC_REG_TIME_REF_COUNT);
>>>> }
>>>>
>>>> static u64 notrace read_hv_clock_msr_cs(struct clocksource *arg)
>>>> @@ -543,14 +543,14 @@ static bool __init hv_init_tsc_clocksource(void)
>>>> * thus TSC clocksource will work even without the real TSC page
>>>> * mapped.
>>>> */
>>>> - tsc_msr.as_uint64 = hv_get_register(HV_REGISTER_REFERENCE_TSC);
>>>> + tsc_msr.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_REFERENCE_TSC);
>>>> if (hv_root_partition)
>>>> tsc_pfn = tsc_msr.pfn;
>>>> else
>>>> tsc_pfn = HVPFN_DOWN(virt_to_phys(tsc_page));
>>>> tsc_msr.enable = 1;
>>>> tsc_msr.pfn = tsc_pfn;
>>>> - hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_REFERENCE_TSC, tsc_msr.as_uint64);
>>>>
>>>> clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100);
>>>>
>>>> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
>>>> index 8b0dd8e5244d..319f21205a9c 100644
>>>> --- a/drivers/hv/hv.c
>>>> +++ b/drivers/hv/hv.c
>>>> @@ -213,7 +213,7 @@ void hv_synic_enable_regs(unsigned int cpu)
>>>> union hv_synic_scontrol sctrl;
>>>>
>>>> /* Setup the Synic's message page */
>>>> - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
>>>> + simp.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SIMP);
>>>> simp.simp_enabled = 1;
>>>>
>>>> if (hv_isolation_type_snp() || hv_root_partition) {
>>>> @@ -227,10 +227,10 @@ void hv_synic_enable_regs(unsigned int cpu)
>>>> >> HV_HYP_PAGE_SHIFT;
>>>> }
>>>>
>>>> - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_SIMP, simp.as_uint64);
>>>>
>>>> /* Setup the Synic's event page */
>>>> - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
>>>> + siefp.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SIEFP);
>>>> siefp.siefp_enabled = 1;
>>>>
>>>> if (hv_isolation_type_snp() || hv_root_partition) {
>>>> @@ -245,12 +245,12 @@ void hv_synic_enable_regs(unsigned int cpu)
>>>> >> HV_HYP_PAGE_SHIFT;
>>>> }
>>>>
>>>> - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_SIEFP, siefp.as_uint64);
>>>>
>>>> /* Setup the shared SINT. */
>>>> if (vmbus_irq != -1)
>>>> enable_percpu_irq(vmbus_irq, 0);
>>>> - shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
>>>> + shared_sint.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SINT0 +
>>>> VMBUS_MESSAGE_SINT);
>>>>
>>>> shared_sint.vector = vmbus_interrupt;
>>>> @@ -266,14 +266,14 @@ void hv_synic_enable_regs(unsigned int cpu)
>>>> #else
>>>> shared_sint.auto_eoi = 0;
>>>> #endif
>>>> - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
>>>> + hv_set_register(HV_SYNTHETIC_REG_SINT0 + VMBUS_MESSAGE_SINT,
>>>> shared_sint.as_uint64);
>>>>
>>>> /* Enable the global synic bit */
>>>> - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
>>>> + sctrl.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SCONTROL);
>>>> sctrl.enable = 1;
>>>>
>>>> - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_SCONTROL, sctrl.as_uint64);
>>>> }
>>>>
>>>> int hv_synic_init(unsigned int cpu)
>>>> @@ -297,17 +297,17 @@ void hv_synic_disable_regs(unsigned int cpu)
>>>> union hv_synic_siefp siefp;
>>>> union hv_synic_scontrol sctrl;
>>>>
>>>> - shared_sint.as_uint64 = hv_get_register(HV_REGISTER_SINT0 +
>>>> + shared_sint.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SINT0 +
>>>> VMBUS_MESSAGE_SINT);
>>>>
>>>> shared_sint.masked = 1;
>>>>
>>>> /* Need to correctly cleanup in the case of SMP!!! */
>>>> /* Disable the interrupt */
>>>> - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
>>>> + hv_set_register(HV_SYNTHETIC_REG_SINT0 + VMBUS_MESSAGE_SINT,
>>>> shared_sint.as_uint64);
>>>>
>>>> - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
>>>> + simp.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SIMP);
>>>> /*
>>>> * In Isolation VM, sim and sief pages are allocated by
>>>> * paravisor. These pages also will be used by kdump
>>>> @@ -322,9 +322,9 @@ void hv_synic_disable_regs(unsigned int cpu)
>>>> simp.base_simp_gpa = 0;
>>>> }
>>>>
>>>> - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_SIMP, simp.as_uint64);
>>>>
>>>> - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
>>>> + siefp.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SIEFP);
>>>> siefp.siefp_enabled = 0;
>>>>
>>>> if (hv_isolation_type_snp() || hv_root_partition) {
>>>> @@ -334,12 +334,12 @@ void hv_synic_disable_regs(unsigned int cpu)
>>>> siefp.base_siefp_gpa = 0;
>>>> }
>>>>
>>>> - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_SIEFP, siefp.as_uint64);
>>>>
>>>> /* Disable the global synic bit */
>>>> - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
>>>> + sctrl.as_uint64 = hv_get_register(HV_SYNTHETIC_REG_SCONTROL);
>>>> sctrl.enable = 0;
>>>> - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
>>>> + hv_set_register(HV_SYNTHETIC_REG_SCONTROL, sctrl.as_uint64);
>>>>
>>>> if (vmbus_irq != -1)
>>>> disable_percpu_irq(vmbus_irq);
>>>> diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
>>>> index 52a6f89ccdbd..77a68f16bc6e 100644
>>>> --- a/drivers/hv/hv_common.c
>>>> +++ b/drivers/hv/hv_common.c
>>>> @@ -142,7 +142,7 @@ int hv_common_cpu_init(unsigned int cpu)
>>>> *outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE;
>>>> }
>>>>
>>>> - msr_vp_index = hv_get_register(HV_REGISTER_VP_INDEX);
>>>> + msr_vp_index = hv_get_register(HV_SYNTHETIC_REG_VP_INDEX);
>>>>
>>>> hv_vp_index[cpu] = msr_vp_index;
>>>>
>>>> @@ -246,7 +246,7 @@ EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
>>>> */
>>>> static u64 __hv_read_ref_counter(void)
>>>> {
>>>> - return hv_get_register(HV_REGISTER_TIME_REF_COUNT);
>>>> + return hv_get_register(HV_SYNTHETIC_REG_TIME_REF_COUNT);
>>>> }
>>>>
>>>> u64 (*hv_read_reference_counter)(void) = __hv_read_ref_counter;
>>>> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
>>>> index 1901556efe79..9ca8a7b73b81 100644
>>>> --- a/drivers/hv/vmbus_drv.c
>>>> +++ b/drivers/hv/vmbus_drv.c
>>>> @@ -1405,17 +1405,17 @@ static void hv_kmsg_dump(struct kmsg_dumper
>>>> *dumper,
>>>> * contain the size of the panic data in that page. Rest of the
>>>> * registers are no-op when the NOTIFY_MSG flag is set.
>>>> */
>>>> - hv_set_register(HV_REGISTER_CRASH_P0, 0);
>>>> - hv_set_register(HV_REGISTER_CRASH_P1, 0);
>>>> - hv_set_register(HV_REGISTER_CRASH_P2, 0);
>>>> - hv_set_register(HV_REGISTER_CRASH_P3, virt_to_phys(hv_panic_page));
>>>> - hv_set_register(HV_REGISTER_CRASH_P4, bytes_written);
>>>> + hv_set_register(HV_SYNTHETIC_REG_CRASH_P0, 0);
>>>> + hv_set_register(HV_SYNTHETIC_REG_CRASH_P1, 0);
>>>> + hv_set_register(HV_SYNTHETIC_REG_CRASH_P2, 0);
>>>> + hv_set_register(HV_SYNTHETIC_REG_CRASH_P3,
>>>> virt_to_phys(hv_panic_page));
>>>> + hv_set_register(HV_SYNTHETIC_REG_CRASH_P4, bytes_written);
>>>>
>>>> /*
>>>> * Let Hyper-V know there is crash data available along with
>>>> * the panic message.
>>>> */
>>>> - hv_set_register(HV_REGISTER_CRASH_CTL,
>>>> + hv_set_register(HV_SYNTHETIC_REG_CRASH_CTL,
>>>> (HV_CRASH_CTL_CRASH_NOTIFY | HV_CRASH_CTL_CRASH_NOTIFY_MSG));
>>>> }
>>>>
>>>> @@ -1555,7 +1555,7 @@ static int vmbus_bus_init(void)
>>>> * Register for panic kmsg callback only if the right
>>>> * capability is supported by the hypervisor.
>>>> */
>>>> - hyperv_crash_ctl = hv_get_register(HV_REGISTER_CRASH_CTL);
>>>> + hyperv_crash_ctl = hv_get_register(HV_SYNTHETIC_REG_CRASH_CTL);
>>>> if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG)
>>>> hv_kmsg_dump_register();
>>>>
>>>> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
>>>> index 8845a2eca339..76bf968d77a8 100644
>>>> --- a/include/asm-generic/mshyperv.h
>>>> +++ b/include/asm-generic/mshyperv.h
>>>> @@ -147,7 +147,7 @@ static inline void vmbus_signal_eom(struct hv_message *msg,
>>>> u32 old_msg_type)
>>>> * possibly deliver another msg from the
>>>> * hypervisor
>>>> */
>>>> - hv_set_register(HV_REGISTER_EOM, 0);
>>>> + hv_set_register(HV_SYNTHETIC_REG_EOM, 0);
>>>> }
>>>> }
>>>>
>>>> --
>>>> 2.25.1
>

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