The HV_REGISTER_ are used as arguments to hv_set/get_register(), which
delegate to arch-specific mechanisms for getting/setting synthetic
Hyper-V MSRs.
On arm64, HV_REGISTER_ defines are synthetic VP registers accessed via
the get/set vp registers hypercalls. The naming matches the TLFS
document, although these register names are not specific to arm64.
However, on x86 the prefix HV_REGISTER_ indicates Hyper-V MSRs accessed
via rdmsrl()/wrmsrl(). This is not consistent with the TLFS doc, where
HV_REGISTER_ is *only* used for used for VP register names used by
the get/set register hypercalls.
To fix this inconsistency and prevent future confusion, change the
arch-generic aliases used by callers of hv_set/get_register() to have
the prefix HV_MSR_ instead of HV_REGISTER_.
Use the prefix HV_X64_MSR_ for the x86-only Hyper-V MSRs. On x86, the
generic HV_MSR_'s point to the corresponding HV_X64_MSR_.
Move the arm64 HV_REGISTER_* defines to the asm-generic hyperv-tlfs.h,
since these are not specific to arm64. On arm64, the generic HV_MSR_'s
point to the corresponding HV_REGISTER_.
While at it, rename hv_get/set_registers() and related functions to
hv_get/set_msr(), hv_get/set_nested_msr(), etc. These are only used for
Hyper-V MSRs and this naming makes that clear.
Signed-off-by: Nuno Das Neves <[email protected]>
Reviewed-by: Wei Liu <[email protected]>
---
arch/arm64/include/asm/hyperv-tlfs.h | 45 ++++-----
arch/arm64/include/asm/mshyperv.h | 4 +-
arch/x86/hyperv/hv_init.c | 8 +-
arch/x86/include/asm/hyperv-tlfs.h | 145 ++++++++++++++-------------
arch/x86/include/asm/mshyperv.h | 30 +++---
arch/x86/kernel/cpu/mshyperv.c | 56 +++++------
drivers/clocksource/hyperv_timer.c | 26 ++---
drivers/hv/hv.c | 36 +++----
drivers/hv/hv_common.c | 22 ++--
include/asm-generic/hyperv-tlfs.h | 32 +++++-
include/asm-generic/mshyperv.h | 2 +-
11 files changed, 216 insertions(+), 190 deletions(-)
diff --git a/arch/arm64/include/asm/hyperv-tlfs.h b/arch/arm64/include/asm/hyperv-tlfs.h
index bc6c7ac934a1..54846d1d29c3 100644
--- a/arch/arm64/include/asm/hyperv-tlfs.h
+++ b/arch/arm64/include/asm/hyperv-tlfs.h
@@ -21,14 +21,6 @@
* byte ordering of Linux running on ARM64, so no special handling is required.
*/
-/*
- * These Hyper-V registers provide information equivalent to the CPUID
- * instruction on x86/x64.
- */
-#define HV_REGISTER_HYPERVISOR_VERSION 0x00000100 /*CPUID 0x40000002 */
-#define HV_REGISTER_FEATURES 0x00000200 /*CPUID 0x40000003 */
-#define HV_REGISTER_ENLIGHTENMENTS 0x00000201 /*CPUID 0x40000004 */
-
/*
* Group C Features. See the asm-generic version of hyperv-tlfs.h
* for a description of Feature Groups.
@@ -41,28 +33,29 @@
#define HV_STIMER_DIRECT_MODE_AVAILABLE BIT(13)
/*
- * Synthetic register definitions equivalent to MSRs on x86/x64
+ * To support arch-generic code calling hv_set/get_register:
+ * - On x86, HV_MSR_ indicates an MSR accessed via rdmsrl/wrmsrl
+ * - On ARM, HV_MSR_ indicates a VP register accessed via hypercall
*/
-#define HV_REGISTER_CRASH_P0 0x00000210
-#define HV_REGISTER_CRASH_P1 0x00000211
-#define HV_REGISTER_CRASH_P2 0x00000212
-#define HV_REGISTER_CRASH_P3 0x00000213
-#define HV_REGISTER_CRASH_P4 0x00000214
-#define HV_REGISTER_CRASH_CTL 0x00000215
+#define HV_MSR_CRASH_P0 (HV_REGISTER_CRASH_P0)
+#define HV_MSR_CRASH_P1 (HV_REGISTER_CRASH_P1)
+#define HV_MSR_CRASH_P2 (HV_REGISTER_CRASH_P2)
+#define HV_MSR_CRASH_P3 (HV_REGISTER_CRASH_P3)
+#define HV_MSR_CRASH_P4 (HV_REGISTER_CRASH_P4)
+#define HV_MSR_CRASH_CTL (HV_REGISTER_CRASH_CTL)
-#define HV_REGISTER_GUEST_OSID 0x00090002
-#define HV_REGISTER_VP_INDEX 0x00090003
-#define HV_REGISTER_TIME_REF_COUNT 0x00090004
-#define HV_REGISTER_REFERENCE_TSC 0x00090017
+#define HV_MSR_VP_INDEX (HV_REGISTER_VP_INDEX)
+#define HV_MSR_TIME_REF_COUNT (HV_REGISTER_TIME_REF_COUNT)
+#define HV_MSR_REFERENCE_TSC (HV_REGISTER_REFERENCE_TSC)
-#define HV_REGISTER_SINT0 0x000A0000
-#define HV_REGISTER_SCONTROL 0x000A0010
-#define HV_REGISTER_SIEFP 0x000A0012
-#define HV_REGISTER_SIMP 0x000A0013
-#define HV_REGISTER_EOM 0x000A0014
+#define HV_MSR_SINT0 (HV_REGISTER_SINT0)
+#define HV_MSR_SCONTROL (HV_REGISTER_SCONTROL)
+#define HV_MSR_SIEFP (HV_REGISTER_SIEFP)
+#define HV_MSR_SIMP (HV_REGISTER_SIMP)
+#define HV_MSR_EOM (HV_REGISTER_EOM)
-#define HV_REGISTER_STIMER0_CONFIG 0x000B0000
-#define HV_REGISTER_STIMER0_COUNT 0x000B0001
+#define HV_MSR_STIMER0_CONFIG (HV_REGISTER_STIMER0_CONFIG)
+#define HV_MSR_STIMER0_COUNT (HV_REGISTER_STIMER0_COUNT)
union hv_msi_entry {
u64 as_uint64[2];
diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h
index 20070a847304..a975e1a689dd 100644
--- a/arch/arm64/include/asm/mshyperv.h
+++ b/arch/arm64/include/asm/mshyperv.h
@@ -31,12 +31,12 @@ void hv_set_vpreg(u32 reg, u64 value);
u64 hv_get_vpreg(u32 reg);
void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
-static inline void hv_set_register(unsigned int reg, u64 value)
+static inline void hv_set_msr(unsigned int reg, u64 value)
{
hv_set_vpreg(reg, value);
}
-static inline u64 hv_get_register(unsigned int reg)
+static inline u64 hv_get_msr(unsigned int reg)
{
return hv_get_vpreg(reg);
}
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 783ed339f341..0c74012b2594 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -642,14 +642,14 @@ void hyperv_cleanup(void)
hv_hypercall_pg = NULL;
/* Reset the hypercall page */
- hypercall_msr.as_uint64 = hv_get_register(HV_X64_MSR_HYPERCALL);
+ hypercall_msr.as_uint64 = hv_get_msr(HV_X64_MSR_HYPERCALL);
hypercall_msr.enable = 0;
- hv_set_register(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
+ hv_set_msr(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
/* Reset the TSC page */
- tsc_msr.as_uint64 = hv_get_register(HV_X64_MSR_REFERENCE_TSC);
+ tsc_msr.as_uint64 = hv_get_msr(HV_X64_MSR_REFERENCE_TSC);
tsc_msr.enable = 0;
- hv_set_register(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
+ hv_set_msr(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
}
void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die)
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 2ff26f53cd62..3787d26810c1 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -182,7 +182,7 @@ 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
@@ -191,10 +191,10 @@ 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
@@ -209,61 +209,61 @@ 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
@@ -276,31 +276,38 @@ enum hv_isolation_type {
/* HV_X64_MSR_TSC_INVARIANT_CONTROL bits */
#define HV_EXPOSE_INVARIANT_TSC BIT_ULL(0)
-/* 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 arch-generic code calling hv_set/get_register:
+ * - On x86, HV_MSR_ indicates an MSR accessed via rdmsrl/wrmsrl
+ * - On ARM, HV_MSR_ indicates a VP register accessed via hypercall
+ */
+#define HV_MSR_CRASH_P0 (HV_X64_MSR_CRASH_P0)
+#define HV_MSR_CRASH_P1 (HV_X64_MSR_CRASH_P1)
+#define HV_MSR_CRASH_P2 (HV_X64_MSR_CRASH_P2)
+#define HV_MSR_CRASH_P3 (HV_X64_MSR_CRASH_P3)
+#define HV_MSR_CRASH_P4 (HV_X64_MSR_CRASH_P4)
+#define HV_MSR_CRASH_CTL (HV_X64_MSR_CRASH_CTL)
+
+#define HV_MSR_VP_INDEX (HV_X64_MSR_VP_INDEX)
+#define HV_MSR_TIME_REF_COUNT (HV_X64_MSR_TIME_REF_COUNT)
+#define HV_MSR_REFERENCE_TSC (HV_X64_MSR_REFERENCE_TSC)
+
+#define HV_MSR_SINT0 (HV_X64_MSR_SINT0)
+#define HV_MSR_SVERSION (HV_X64_MSR_SVERSION)
+#define HV_MSR_SCONTROL (HV_X64_MSR_SCONTROL)
+#define HV_MSR_SIEFP (HV_X64_MSR_SIEFP)
+#define HV_MSR_SIMP (HV_X64_MSR_SIMP)
+#define HV_MSR_EOM (HV_X64_MSR_EOM)
+
+#define HV_MSR_NESTED_SCONTROL (HV_X64_MSR_NESTED_SCONTROL)
+#define HV_MSR_NESTED_SVERSION (HV_X64_MSR_NESTED_SVERSION)
+#define HV_MSR_NESTED_SIEFP (HV_X64_MSR_NESTED_SIEFP)
+#define HV_MSR_NESTED_SIMP (HV_X64_MSR_NESTED_SIMP)
+#define HV_MSR_NESTED_EOM (HV_X64_MSR_NESTED_EOM)
+#define HV_MSR_NESTED_SINT0 (HV_X64_MSR_NESTED_SINT0)
+
+#define HV_MSR_STIMER0_CONFIG (HV_X64_MSR_STIMER0_CONFIG)
+#define HV_MSR_STIMER0_COUNT (HV_X64_MSR_STIMER0_COUNT)
/*
* Registers are only accessible via HVCALL_GET_VP_REGISTERS hvcall and
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 033b53f993c6..b06d6fd75367 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -293,24 +293,24 @@ static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
#endif
-static inline bool hv_is_synic_reg(unsigned int reg)
+static inline bool hv_is_synic_msr(unsigned int reg)
{
- 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)
+static inline bool hv_is_sint_msr(unsigned int reg)
{
- 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);
-void hv_set_register(unsigned int reg, u64 value);
-u64 hv_get_non_nested_register(unsigned int reg);
-void hv_set_non_nested_register(unsigned int reg, u64 value);
+u64 hv_get_msr(unsigned int reg);
+void hv_set_msr(unsigned int reg, u64 value);
+u64 hv_get_non_nested_msr(unsigned int reg);
+void hv_set_non_nested_msr(unsigned int reg, u64 value);
-static __always_inline u64 hv_raw_get_register(unsigned int reg)
+static __always_inline u64 hv_raw_get_msr(unsigned int reg)
{
return __rdmsr(reg);
}
@@ -331,10 +331,10 @@ static inline int hyperv_flush_guest_mapping_range(u64 as,
{
return -1;
}
-static inline void hv_set_register(unsigned int reg, u64 value) { }
-static inline u64 hv_get_register(unsigned int reg) { return 0; }
-static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
-static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
+static inline void hv_set_msr(unsigned int reg, u64 value) { }
+static inline u64 hv_get_msr(unsigned int reg) { return 0; }
+static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
+static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
#endif /* CONFIG_HYPERV */
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index e6bba12c759c..649c1127054c 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -45,70 +45,70 @@ bool hyperv_paravisor_present __ro_after_init;
EXPORT_SYMBOL_GPL(hyperv_paravisor_present);
#if IS_ENABLED(CONFIG_HYPERV)
-static inline unsigned int hv_get_nested_reg(unsigned int reg)
+static inline unsigned int hv_get_nested_msr(unsigned int reg)
{
- if (hv_is_sint_reg(reg))
- return reg - HV_REGISTER_SINT0 + HV_REGISTER_NESTED_SINT0;
+ if (hv_is_sint_msr(reg))
+ return reg - HV_MSR_SINT0 + HV_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_MSR_SIMP:
+ return HV_MSR_NESTED_SIMP;
+ case HV_MSR_SIEFP:
+ return HV_MSR_NESTED_SIEFP;
+ case HV_MSR_SVERSION:
+ return HV_MSR_NESTED_SVERSION;
+ case HV_MSR_SCONTROL:
+ return HV_MSR_NESTED_SCONTROL;
+ case HV_MSR_EOM:
+ return HV_MSR_NESTED_EOM;
default:
return reg;
}
}
-u64 hv_get_non_nested_register(unsigned int reg)
+u64 hv_get_non_nested_msr(unsigned int reg)
{
u64 value;
- if (hv_is_synic_reg(reg) && ms_hyperv.paravisor_present)
+ if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present)
hv_ivm_msr_read(reg, &value);
else
rdmsrl(reg, value);
return value;
}
-EXPORT_SYMBOL_GPL(hv_get_non_nested_register);
+EXPORT_SYMBOL_GPL(hv_get_non_nested_msr);
-void hv_set_non_nested_register(unsigned int reg, u64 value)
+void hv_set_non_nested_msr(unsigned int reg, u64 value)
{
- if (hv_is_synic_reg(reg) && ms_hyperv.paravisor_present) {
+ if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present) {
hv_ivm_msr_write(reg, value);
/* Write proxy bit via wrmsl instruction */
- if (hv_is_sint_reg(reg))
+ if (hv_is_sint_msr(reg))
wrmsrl(reg, value | 1 << 20);
} else {
wrmsrl(reg, value);
}
}
-EXPORT_SYMBOL_GPL(hv_set_non_nested_register);
+EXPORT_SYMBOL_GPL(hv_set_non_nested_msr);
-u64 hv_get_register(unsigned int reg)
+u64 hv_get_msr(unsigned int reg)
{
if (hv_nested)
- reg = hv_get_nested_reg(reg);
+ reg = hv_get_nested_msr(reg);
- return hv_get_non_nested_register(reg);
+ return hv_get_non_nested_msr(reg);
}
-EXPORT_SYMBOL_GPL(hv_get_register);
+EXPORT_SYMBOL_GPL(hv_get_msr);
-void hv_set_register(unsigned int reg, u64 value)
+void hv_set_msr(unsigned int reg, u64 value)
{
if (hv_nested)
- reg = hv_get_nested_reg(reg);
+ reg = hv_get_nested_msr(reg);
- hv_set_non_nested_register(reg, value);
+ hv_set_non_nested_msr(reg, value);
}
-EXPORT_SYMBOL_GPL(hv_set_register);
+EXPORT_SYMBOL_GPL(hv_set_msr);
static void (*vmbus_handler)(void);
static void (*hv_stimer0_handler)(void);
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index 8ff7cd4e20bb..b2a080647e41 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_msr(HV_MSR_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_msr(HV_MSR_STIMER0_COUNT, 0);
+ hv_set_msr(HV_MSR_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_msr(HV_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
return 0;
}
@@ -372,11 +372,11 @@ static __always_inline u64 read_hv_clock_msr(void)
* is set to 0 when the partition is created and is incremented in 100
* nanosecond units.
*
- * Use hv_raw_get_register() because this function is used from
- * noinstr. Notable; while HV_REGISTER_TIME_REF_COUNT is a synthetic
+ * Use hv_raw_get_msr() because this function is used from
+ * noinstr. Notable; while HV_MSR_TIME_REF_COUNT is a synthetic
* register it doesn't need the GHCB path.
*/
- return hv_raw_get_register(HV_REGISTER_TIME_REF_COUNT);
+ return hv_raw_get_msr(HV_MSR_TIME_REF_COUNT);
}
/*
@@ -439,9 +439,9 @@ 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_msr(HV_MSR_REFERENCE_TSC);
tsc_msr.enable = 0;
- hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
+ hv_set_msr(HV_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
}
@@ -450,10 +450,10 @@ 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_msr(HV_MSR_REFERENCE_TSC);
tsc_msr.enable = 1;
tsc_msr.pfn = tsc_pfn;
- hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
+ hv_set_msr(HV_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
}
#ifdef HAVE_VDSO_CLOCKMODE_HVCLOCK
@@ -555,14 +555,14 @@ static void __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_msr(HV_MSR_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_msr(HV_MSR_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 51e5018ac9b2..a8ad728354cb 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -270,7 +270,7 @@ 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_msr(HV_MSR_SIMP);
simp.simp_enabled = 1;
if (ms_hyperv.paravisor_present || hv_root_partition) {
@@ -286,10 +286,10 @@ void hv_synic_enable_regs(unsigned int cpu)
>> HV_HYP_PAGE_SHIFT;
}
- hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
+ hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
/* Setup the Synic's event page */
- siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
+ siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
siefp.siefp_enabled = 1;
if (ms_hyperv.paravisor_present || hv_root_partition) {
@@ -305,13 +305,12 @@ void hv_synic_enable_regs(unsigned int cpu)
>> HV_HYP_PAGE_SHIFT;
}
- hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
+ hv_set_msr(HV_MSR_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 +
- VMBUS_MESSAGE_SINT);
+ shared_sint.as_uint64 = hv_get_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT);
shared_sint.vector = vmbus_interrupt;
shared_sint.masked = false;
@@ -326,14 +325,13 @@ void hv_synic_enable_regs(unsigned int cpu)
#else
shared_sint.auto_eoi = 0;
#endif
- hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
- shared_sint.as_uint64);
+ hv_set_msr(HV_MSR_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_msr(HV_MSR_SCONTROL);
sctrl.enable = 1;
- hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
+ hv_set_msr(HV_MSR_SCONTROL, sctrl.as_uint64);
}
int hv_synic_init(unsigned int cpu)
@@ -357,17 +355,15 @@ 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 +
- VMBUS_MESSAGE_SINT);
+ shared_sint.as_uint64 = hv_get_msr(HV_MSR_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,
- shared_sint.as_uint64);
+ hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
- simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
+ simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
/*
* In Isolation VM, sim and sief pages are allocated by
* paravisor. These pages also will be used by kdump
@@ -382,9 +378,9 @@ void hv_synic_disable_regs(unsigned int cpu)
simp.base_simp_gpa = 0;
}
- hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
+ hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
- siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
+ siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
siefp.siefp_enabled = 0;
if (ms_hyperv.paravisor_present || hv_root_partition) {
@@ -394,12 +390,12 @@ void hv_synic_disable_regs(unsigned int cpu)
siefp.base_siefp_gpa = 0;
}
- hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
+ hv_set_msr(HV_MSR_SIEFP, siefp.as_uint64);
/* Disable the global synic bit */
- sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
+ sctrl.as_uint64 = hv_get_msr(HV_MSR_SCONTROL);
sctrl.enable = 0;
- hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
+ hv_set_msr(HV_MSR_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 ccad7bca3fd3..65c0740484cb 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -228,19 +228,19 @@ 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_msr(HV_MSR_CRASH_P0, 0);
+ hv_set_msr(HV_MSR_CRASH_P1, 0);
+ hv_set_msr(HV_MSR_CRASH_P2, 0);
+ hv_set_msr(HV_MSR_CRASH_P3, virt_to_phys(hv_panic_page));
+ hv_set_msr(HV_MSR_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_CRASH_CTL_CRASH_NOTIFY |
- HV_CRASH_CTL_CRASH_NOTIFY_MSG));
+ hv_set_msr(HV_MSR_CRASH_CTL,
+ (HV_CRASH_CTL_CRASH_NOTIFY |
+ HV_CRASH_CTL_CRASH_NOTIFY_MSG));
}
static struct kmsg_dumper hv_kmsg_dumper = {
@@ -311,7 +311,7 @@ int __init hv_common_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_msr(HV_MSR_CRASH_CTL);
if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG)
hv_kmsg_dump_register();
@@ -410,7 +410,7 @@ int hv_common_cpu_init(unsigned int cpu)
*inputarg = mem;
}
- msr_vp_index = hv_get_register(HV_REGISTER_VP_INDEX);
+ msr_vp_index = hv_get_msr(HV_MSR_VP_INDEX);
hv_vp_index[cpu] = msr_vp_index;
@@ -507,7 +507,7 @@ 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_msr(HV_MSR_TIME_REF_COUNT);
}
u64 (*hv_read_reference_counter)(void) = __hv_read_ref_counter;
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index fdac4a1714ec..3d1b31f90ed6 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -625,6 +625,37 @@ struct hv_retarget_device_interrupt {
struct hv_device_interrupt_target int_target;
} __packed __aligned(8);
+/*
+ * These Hyper-V registers provide information equivalent to the CPUID
+ * instruction on x86/x64.
+ */
+#define HV_REGISTER_HYPERVISOR_VERSION 0x00000100 /*CPUID 0x40000002 */
+#define HV_REGISTER_FEATURES 0x00000200 /*CPUID 0x40000003 */
+#define HV_REGISTER_ENLIGHTENMENTS 0x00000201 /*CPUID 0x40000004 */
+
+/*
+ * Synthetic register definitions equivalent to MSRs on x86/x64
+ */
+#define HV_REGISTER_CRASH_P0 0x00000210
+#define HV_REGISTER_CRASH_P1 0x00000211
+#define HV_REGISTER_CRASH_P2 0x00000212
+#define HV_REGISTER_CRASH_P3 0x00000213
+#define HV_REGISTER_CRASH_P4 0x00000214
+#define HV_REGISTER_CRASH_CTL 0x00000215
+
+#define HV_REGISTER_GUEST_OSID 0x00090002
+#define HV_REGISTER_VP_INDEX 0x00090003
+#define HV_REGISTER_TIME_REF_COUNT 0x00090004
+#define HV_REGISTER_REFERENCE_TSC 0x00090017
+
+#define HV_REGISTER_SINT0 0x000A0000
+#define HV_REGISTER_SCONTROL 0x000A0010
+#define HV_REGISTER_SIEFP 0x000A0012
+#define HV_REGISTER_SIMP 0x000A0013
+#define HV_REGISTER_EOM 0x000A0014
+
+#define HV_REGISTER_STIMER0_CONFIG 0x000B0000
+#define HV_REGISTER_STIMER0_COUNT 0x000B0001
/* HvGetVpRegisters hypercall input with variable size reg name list*/
struct hv_get_vp_registers_input {
@@ -640,7 +671,6 @@ struct hv_get_vp_registers_input {
} element[];
} __packed;
-
/* HvGetVpRegisters returns an array of these output elements */
struct hv_get_vp_registers_output {
union {
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index cecd2b7bd033..2dc65c1d3117 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -157,7 +157,7 @@ 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_msr(HV_MSR_EOM, 0);
}
}
--
2.25.1
From: Nuno Das Neves <[email protected]> Sent: Thursday, February 8, 2024 2:52 AM
>
> The HV_REGISTER_ are used as arguments to hv_set/get_register(), which
> delegate to arch-specific mechanisms for getting/setting synthetic
> Hyper-V MSRs.
>
> On arm64, HV_REGISTER_ defines are synthetic VP registers accessed via
> the get/set vp registers hypercalls. The naming matches the TLFS
> document, although these register names are not specific to arm64.
>
> However, on x86 the prefix HV_REGISTER_ indicates Hyper-V MSRs accessed
> via rdmsrl()/wrmsrl(). This is not consistent with the TLFS doc, where
> HV_REGISTER_ is *only* used for used for VP register names used by
> the get/set register hypercalls.
>
> To fix this inconsistency and prevent future confusion, change the
> arch-generic aliases used by callers of hv_set/get_register() to have
> the prefix HV_MSR_ instead of HV_REGISTER_.
>
> Use the prefix HV_X64_MSR_ for the x86-only Hyper-V MSRs. On x86, the
> generic HV_MSR_'s point to the corresponding HV_X64_MSR_.
>
> Move the arm64 HV_REGISTER_* defines to the asm-generic hyperv-tlfs.h,
> since these are not specific to arm64. On arm64, the generic HV_MSR_'s
> point to the corresponding HV_REGISTER_.
>
> While at it, rename hv_get/set_registers() and related functions to
> hv_get/set_msr(), hv_get/set_nested_msr(), etc. These are only used for
> Hyper-V MSRs and this naming makes that clear.
>
> Signed-off-by: Nuno Das Neves <[email protected]>
> Reviewed-by: Wei Liu <[email protected]>
Overall, this looks good to me. It cleans up the mess I made five
years ago when first separating x86 from ARM64. :-(
See one comment below, but otherwise,
Reviewed-by: Michael Kelley <[email protected]>
> ---
> arch/arm64/include/asm/hyperv-tlfs.h | 45 ++++-----
> arch/arm64/include/asm/mshyperv.h | 4 +-
> arch/x86/hyperv/hv_init.c | 8 +-
> arch/x86/include/asm/hyperv-tlfs.h | 145 ++++++++++++++-------------
> arch/x86/include/asm/mshyperv.h | 30 +++---
> arch/x86/kernel/cpu/mshyperv.c | 56 +++++------
> drivers/clocksource/hyperv_timer.c | 26 ++---
> drivers/hv/hv.c | 36 +++----
> drivers/hv/hv_common.c | 22 ++--
> include/asm-generic/hyperv-tlfs.h | 32 +++++-
> include/asm-generic/mshyperv.h | 2 +-
> 11 files changed, 216 insertions(+), 190 deletions(-)
>
> diff --git a/arch/arm64/include/asm/hyperv-tlfs.h
> b/arch/arm64/include/asm/hyperv-tlfs.h
> index bc6c7ac934a1..54846d1d29c3 100644
> --- a/arch/arm64/include/asm/hyperv-tlfs.h
> +++ b/arch/arm64/include/asm/hyperv-tlfs.h
> @@ -21,14 +21,6 @@
> * byte ordering of Linux running on ARM64, so no special handling is required.
> */
>
> -/*
> - * These Hyper-V registers provide information equivalent to the CPUID
> - * instruction on x86/x64.
> - */
> -#define HV_REGISTER_HYPERVISOR_VERSION 0x00000100 /*CPUID 0x40000002 */
> -#define HV_REGISTER_FEATURES 0x00000200 /*CPUID 0x40000003 */
> -#define HV_REGISTER_ENLIGHTENMENTS 0x00000201 /*CPUID 0x40000004 */
> -
> /*
> * Group C Features. See the asm-generic version of hyperv-tlfs.h
> * for a description of Feature Groups.
> @@ -41,28 +33,29 @@
> #define HV_STIMER_DIRECT_MODE_AVAILABLE BIT(13)
>
> /*
> - * Synthetic register definitions equivalent to MSRs on x86/x64
> + * To support arch-generic code calling hv_set/get_register:
> + * - On x86, HV_MSR_ indicates an MSR accessed via rdmsrl/wrmsrl
> + * - On ARM, HV_MSR_ indicates a VP register accessed via hypercall
> */
> -#define HV_REGISTER_CRASH_P0 0x00000210
> -#define HV_REGISTER_CRASH_P1 0x00000211
> -#define HV_REGISTER_CRASH_P2 0x00000212
> -#define HV_REGISTER_CRASH_P3 0x00000213
> -#define HV_REGISTER_CRASH_P4 0x00000214
> -#define HV_REGISTER_CRASH_CTL 0x00000215
> +#define HV_MSR_CRASH_P0 (HV_REGISTER_CRASH_P0)
> +#define HV_MSR_CRASH_P1 (HV_REGISTER_CRASH_P1)
> +#define HV_MSR_CRASH_P2 (HV_REGISTER_CRASH_P2)
> +#define HV_MSR_CRASH_P3 (HV_REGISTER_CRASH_P3)
> +#define HV_MSR_CRASH_P4 (HV_REGISTER_CRASH_P4)
> +#define HV_MSR_CRASH_CTL (HV_REGISTER_CRASH_CTL)
>
> -#define HV_REGISTER_GUEST_OSID 0x00090002
> -#define HV_REGISTER_VP_INDEX 0x00090003
> -#define HV_REGISTER_TIME_REF_COUNT 0x00090004
> -#define HV_REGISTER_REFERENCE_TSC 0x00090017
> +#define HV_MSR_VP_INDEX (HV_REGISTER_VP_INDEX)
> +#define HV_MSR_TIME_REF_COUNT (HV_REGISTER_TIME_REF_COUNT)
> +#define HV_MSR_REFERENCE_TSC (HV_REGISTER_REFERENCE_TSC)
>
> -#define HV_REGISTER_SINT0 0x000A0000
> -#define HV_REGISTER_SCONTROL 0x000A0010
> -#define HV_REGISTER_SIEFP 0x000A0012
> -#define HV_REGISTER_SIMP 0x000A0013
> -#define HV_REGISTER_EOM 0x000A0014
> +#define HV_MSR_SINT0 (HV_REGISTER_SINT0)
> +#define HV_MSR_SCONTROL (HV_REGISTER_SCONTROL)
> +#define HV_MSR_SIEFP (HV_REGISTER_SIEFP)
> +#define HV_MSR_SIMP (HV_REGISTER_SIMP)
> +#define HV_MSR_EOM (HV_REGISTER_EOM)
>
> -#define HV_REGISTER_STIMER0_CONFIG 0x000B0000
> -#define HV_REGISTER_STIMER0_COUNT 0x000B0001
> +#define HV_MSR_STIMER0_CONFIG (HV_REGISTER_STIMER0_CONFIG)
> +#define HV_MSR_STIMER0_COUNT (HV_REGISTER_STIMER0_COUNT)
>
> union hv_msi_entry {
> u64 as_uint64[2];
> diff --git a/arch/arm64/include/asm/mshyperv.h
> b/arch/arm64/include/asm/mshyperv.h
> index 20070a847304..a975e1a689dd 100644
> --- a/arch/arm64/include/asm/mshyperv.h
> +++ b/arch/arm64/include/asm/mshyperv.h
> @@ -31,12 +31,12 @@ void hv_set_vpreg(u32 reg, u64 value);
> u64 hv_get_vpreg(u32 reg);
> void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
>
> -static inline void hv_set_register(unsigned int reg, u64 value)
> +static inline void hv_set_msr(unsigned int reg, u64 value)
> {
> hv_set_vpreg(reg, value);
> }
>
> -static inline u64 hv_get_register(unsigned int reg)
> +static inline u64 hv_get_msr(unsigned int reg)
> {
> return hv_get_vpreg(reg);
> }
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index 783ed339f341..0c74012b2594 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -642,14 +642,14 @@ void hyperv_cleanup(void)
> hv_hypercall_pg = NULL;
>
> /* Reset the hypercall page */
> - hypercall_msr.as_uint64 = hv_get_register(HV_X64_MSR_HYPERCALL);
> + hypercall_msr.as_uint64 = hv_get_msr(HV_X64_MSR_HYPERCALL);
> hypercall_msr.enable = 0;
> - hv_set_register(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
> + hv_set_msr(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
>
> /* Reset the TSC page */
> - tsc_msr.as_uint64 = hv_get_register(HV_X64_MSR_REFERENCE_TSC);
> + tsc_msr.as_uint64 = hv_get_msr(HV_X64_MSR_REFERENCE_TSC);
> tsc_msr.enable = 0;
> - hv_set_register(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
> + hv_set_msr(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
> }
>
> void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die)
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h
> b/arch/x86/include/asm/hyperv-tlfs.h
> index 2ff26f53cd62..3787d26810c1 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -182,7 +182,7 @@ 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
> @@ -191,10 +191,10 @@ 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
> @@ -209,61 +209,61 @@ 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
> @@ -276,31 +276,38 @@ enum hv_isolation_type {
> /* HV_X64_MSR_TSC_INVARIANT_CONTROL bits */
> #define HV_EXPOSE_INVARIANT_TSC BIT_ULL(0)
>
> -/* 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 arch-generic code calling hv_set/get_register:
> + * - On x86, HV_MSR_ indicates an MSR accessed via rdmsrl/wrmsrl
> + * - On ARM, HV_MSR_ indicates a VP register accessed via hypercall
> + */
> +#define HV_MSR_CRASH_P0 (HV_X64_MSR_CRASH_P0)
> +#define HV_MSR_CRASH_P1 (HV_X64_MSR_CRASH_P1)
> +#define HV_MSR_CRASH_P2 (HV_X64_MSR_CRASH_P2)
> +#define HV_MSR_CRASH_P3 (HV_X64_MSR_CRASH_P3)
> +#define HV_MSR_CRASH_P4 (HV_X64_MSR_CRASH_P4)
> +#define HV_MSR_CRASH_CTL (HV_X64_MSR_CRASH_CTL)
> +
> +#define HV_MSR_VP_INDEX (HV_X64_MSR_VP_INDEX)
> +#define HV_MSR_TIME_REF_COUNT (HV_X64_MSR_TIME_REF_COUNT)
> +#define HV_MSR_REFERENCE_TSC (HV_X64_MSR_REFERENCE_TSC)
> +
> +#define HV_MSR_SINT0 (HV_X64_MSR_SINT0)
> +#define HV_MSR_SVERSION (HV_X64_MSR_SVERSION)
> +#define HV_MSR_SCONTROL (HV_X64_MSR_SCONTROL)
> +#define HV_MSR_SIEFP (HV_X64_MSR_SIEFP)
> +#define HV_MSR_SIMP (HV_X64_MSR_SIMP)
> +#define HV_MSR_EOM (HV_X64_MSR_EOM)
> +
> +#define HV_MSR_NESTED_SCONTROL (HV_X64_MSR_NESTED_SCONTROL)
> +#define HV_MSR_NESTED_SVERSION (HV_X64_MSR_NESTED_SVERSION)
> +#define HV_MSR_NESTED_SIEFP (HV_X64_MSR_NESTED_SIEFP)
> +#define HV_MSR_NESTED_SIMP (HV_X64_MSR_NESTED_SIMP)
> +#define HV_MSR_NESTED_EOM (HV_X64_MSR_NESTED_EOM)
> +#define HV_MSR_NESTED_SINT0 (HV_X64_MSR_NESTED_SINT0)
> +
> +#define HV_MSR_STIMER0_CONFIG (HV_X64_MSR_STIMER0_CONFIG)
> +#define HV_MSR_STIMER0_COUNT (HV_X64_MSR_STIMER0_COUNT)
>
> /*
> * Registers are only accessible via HVCALL_GET_VP_REGISTERS hvcall and
> diff --git a/arch/x86/include/asm/mshyperv.h
> b/arch/x86/include/asm/mshyperv.h
> index 033b53f993c6..b06d6fd75367 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -293,24 +293,24 @@ static inline void hv_ivm_msr_write(u64 msr, u64
> value) {}
> static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
> #endif
>
> -static inline bool hv_is_synic_reg(unsigned int reg)
> +static inline bool hv_is_synic_msr(unsigned int reg)
> {
> - 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)
> +static inline bool hv_is_sint_msr(unsigned int reg)
> {
> - 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);
> -void hv_set_register(unsigned int reg, u64 value);
> -u64 hv_get_non_nested_register(unsigned int reg);
> -void hv_set_non_nested_register(unsigned int reg, u64 value);
> +u64 hv_get_msr(unsigned int reg);
> +void hv_set_msr(unsigned int reg, u64 value);
> +u64 hv_get_non_nested_msr(unsigned int reg);
> +void hv_set_non_nested_msr(unsigned int reg, u64 value);
>
> -static __always_inline u64 hv_raw_get_register(unsigned int reg)
> +static __always_inline u64 hv_raw_get_msr(unsigned int reg)
> {
> return __rdmsr(reg);
> }
> @@ -331,10 +331,10 @@ static inline int
> hyperv_flush_guest_mapping_range(u64 as,
> {
> return -1;
> }
> -static inline void hv_set_register(unsigned int reg, u64 value) { }
> -static inline u64 hv_get_register(unsigned int reg) { return 0; }
> -static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
> -static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
> +static inline void hv_set_msr(unsigned int reg, u64 value) { }
> +static inline u64 hv_get_msr(unsigned int reg) { return 0; }
> +static inline void hv_set_non_nested_msr(unsigned int reg, u64 value) { }
> +static inline u64 hv_get_non_nested_msr(unsigned int reg) { return 0; }
> #endif /* CONFIG_HYPERV */
>
>
> diff --git a/arch/x86/kernel/cpu/mshyperv.c
> b/arch/x86/kernel/cpu/mshyperv.c
> index e6bba12c759c..649c1127054c 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -45,70 +45,70 @@ bool hyperv_paravisor_present __ro_after_init;
> EXPORT_SYMBOL_GPL(hyperv_paravisor_present);
>
> #if IS_ENABLED(CONFIG_HYPERV)
> -static inline unsigned int hv_get_nested_reg(unsigned int reg)
> +static inline unsigned int hv_get_nested_msr(unsigned int reg)
> {
> - if (hv_is_sint_reg(reg))
> - return reg - HV_REGISTER_SINT0 + HV_REGISTER_NESTED_SINT0;
> + if (hv_is_sint_msr(reg))
> + return reg - HV_MSR_SINT0 + HV_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_MSR_SIMP:
> + return HV_MSR_NESTED_SIMP;
> + case HV_MSR_SIEFP:
> + return HV_MSR_NESTED_SIEFP;
> + case HV_MSR_SVERSION:
> + return HV_MSR_NESTED_SVERSION;
> + case HV_MSR_SCONTROL:
> + return HV_MSR_NESTED_SCONTROL;
> + case HV_MSR_EOM:
> + return HV_MSR_NESTED_EOM;
> default:
> return reg;
> }
> }
This function is x86 specific, but you are using the generic HV_MSR_* flavor
instead of the x86 specific HV_X64_MSR_* flavor like in other x86 specific code.
Both flavors work, but I wondered if there is any reason for using the generic flavor.
I remember debating myself the merits of one approach vs. the other, but I
don't think there was a solid argument either way. Given that you are
doing the work to get this all fixed like it should have been originally, I would
argue for being consistently one way or the other. ARM64 specific code is
*not* using the generic HV_MSR_* flavor, so I suspect x86 code should not
either.
Michael
>
> -u64 hv_get_non_nested_register(unsigned int reg)
> +u64 hv_get_non_nested_msr(unsigned int reg)
> {
> u64 value;
>
> - if (hv_is_synic_reg(reg) && ms_hyperv.paravisor_present)
> + if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present)
> hv_ivm_msr_read(reg, &value);
> else
> rdmsrl(reg, value);
> return value;
> }
> -EXPORT_SYMBOL_GPL(hv_get_non_nested_register);
> +EXPORT_SYMBOL_GPL(hv_get_non_nested_msr);
>
> -void hv_set_non_nested_register(unsigned int reg, u64 value)
> +void hv_set_non_nested_msr(unsigned int reg, u64 value)
> {
> - if (hv_is_synic_reg(reg) && ms_hyperv.paravisor_present) {
> + if (hv_is_synic_msr(reg) && ms_hyperv.paravisor_present) {
> hv_ivm_msr_write(reg, value);
>
> /* Write proxy bit via wrmsl instruction */
> - if (hv_is_sint_reg(reg))
> + if (hv_is_sint_msr(reg))
> wrmsrl(reg, value | 1 << 20);
> } else {
> wrmsrl(reg, value);
> }
> }
> -EXPORT_SYMBOL_GPL(hv_set_non_nested_register);
> +EXPORT_SYMBOL_GPL(hv_set_non_nested_msr);
>
> -u64 hv_get_register(unsigned int reg)
> +u64 hv_get_msr(unsigned int reg)
> {
> if (hv_nested)
> - reg = hv_get_nested_reg(reg);
> + reg = hv_get_nested_msr(reg);
>
> - return hv_get_non_nested_register(reg);
> + return hv_get_non_nested_msr(reg);
> }
> -EXPORT_SYMBOL_GPL(hv_get_register);
> +EXPORT_SYMBOL_GPL(hv_get_msr);
>
> -void hv_set_register(unsigned int reg, u64 value)
> +void hv_set_msr(unsigned int reg, u64 value)
> {
> if (hv_nested)
> - reg = hv_get_nested_reg(reg);
> + reg = hv_get_nested_msr(reg);
>
> - hv_set_non_nested_register(reg, value);
> + hv_set_non_nested_msr(reg, value);
> }
> -EXPORT_SYMBOL_GPL(hv_set_register);
> +EXPORT_SYMBOL_GPL(hv_set_msr);
>
> static void (*vmbus_handler)(void);
> static void (*hv_stimer0_handler)(void);
> diff --git a/drivers/clocksource/hyperv_timer.c
> b/drivers/clocksource/hyperv_timer.c
> index 8ff7cd4e20bb..b2a080647e41 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_msr(HV_MSR_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_msr(HV_MSR_STIMER0_COUNT, 0);
> + hv_set_msr(HV_MSR_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_msr(HV_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
> return 0;
> }
>
> @@ -372,11 +372,11 @@ static __always_inline u64
> read_hv_clock_msr(void)
> * is set to 0 when the partition is created and is incremented in 100
> * nanosecond units.
> *
> - * Use hv_raw_get_register() because this function is used from
> - * noinstr. Notable; while HV_REGISTER_TIME_REF_COUNT is a
> synthetic
> + * Use hv_raw_get_msr() because this function is used from
> + * noinstr. Notable; while HV_MSR_TIME_REF_COUNT is a synthetic
> * register it doesn't need the GHCB path.
> */
> - return hv_raw_get_register(HV_REGISTER_TIME_REF_COUNT);
> + return hv_raw_get_msr(HV_MSR_TIME_REF_COUNT);
> }
>
> /*
> @@ -439,9 +439,9 @@ 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_msr(HV_MSR_REFERENCE_TSC);
> tsc_msr.enable = 0;
> - hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
> + hv_set_msr(HV_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
> }
>
>
> @@ -450,10 +450,10 @@ 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_msr(HV_MSR_REFERENCE_TSC);
> tsc_msr.enable = 1;
> tsc_msr.pfn = tsc_pfn;
> - hv_set_register(HV_REGISTER_REFERENCE_TSC, tsc_msr.as_uint64);
> + hv_set_msr(HV_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
> }
>
> #ifdef HAVE_VDSO_CLOCKMODE_HVCLOCK
> @@ -555,14 +555,14 @@ static void __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_msr(HV_MSR_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_msr(HV_MSR_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 51e5018ac9b2..a8ad728354cb 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -270,7 +270,7 @@ 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_msr(HV_MSR_SIMP);
> simp.simp_enabled = 1;
>
> if (ms_hyperv.paravisor_present || hv_root_partition) {
> @@ -286,10 +286,10 @@ void hv_synic_enable_regs(unsigned int cpu)
> >> HV_HYP_PAGE_SHIFT;
> }
>
> - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
> + hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
>
> /* Setup the Synic's event page */
> - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
> + siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
> siefp.siefp_enabled = 1;
>
> if (ms_hyperv.paravisor_present || hv_root_partition) {
> @@ -305,13 +305,12 @@ void hv_synic_enable_regs(unsigned int cpu)
> >> HV_HYP_PAGE_SHIFT;
> }
>
> - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
> + hv_set_msr(HV_MSR_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 +
> - VMBUS_MESSAGE_SINT);
> + shared_sint.as_uint64 = hv_get_msr(HV_MSR_SINT0 +
> VMBUS_MESSAGE_SINT);
>
> shared_sint.vector = vmbus_interrupt;
> shared_sint.masked = false;
> @@ -326,14 +325,13 @@ void hv_synic_enable_regs(unsigned int cpu)
> #else
> shared_sint.auto_eoi = 0;
> #endif
> - hv_set_register(HV_REGISTER_SINT0 + VMBUS_MESSAGE_SINT,
> - shared_sint.as_uint64);
> + hv_set_msr(HV_MSR_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_msr(HV_MSR_SCONTROL);
> sctrl.enable = 1;
>
> - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
> + hv_set_msr(HV_MSR_SCONTROL, sctrl.as_uint64);
> }
>
> int hv_synic_init(unsigned int cpu)
> @@ -357,17 +355,15 @@ 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 +
> - VMBUS_MESSAGE_SINT);
> + shared_sint.as_uint64 = hv_get_msr(HV_MSR_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,
> - shared_sint.as_uint64);
> + hv_set_msr(HV_MSR_SINT0 + VMBUS_MESSAGE_SINT,
> shared_sint.as_uint64);
>
> - simp.as_uint64 = hv_get_register(HV_REGISTER_SIMP);
> + simp.as_uint64 = hv_get_msr(HV_MSR_SIMP);
> /*
> * In Isolation VM, sim and sief pages are allocated by
> * paravisor. These pages also will be used by kdump
> @@ -382,9 +378,9 @@ void hv_synic_disable_regs(unsigned int cpu)
> simp.base_simp_gpa = 0;
> }
>
> - hv_set_register(HV_REGISTER_SIMP, simp.as_uint64);
> + hv_set_msr(HV_MSR_SIMP, simp.as_uint64);
>
> - siefp.as_uint64 = hv_get_register(HV_REGISTER_SIEFP);
> + siefp.as_uint64 = hv_get_msr(HV_MSR_SIEFP);
> siefp.siefp_enabled = 0;
>
> if (ms_hyperv.paravisor_present || hv_root_partition) {
> @@ -394,12 +390,12 @@ void hv_synic_disable_regs(unsigned int cpu)
> siefp.base_siefp_gpa = 0;
> }
>
> - hv_set_register(HV_REGISTER_SIEFP, siefp.as_uint64);
> + hv_set_msr(HV_MSR_SIEFP, siefp.as_uint64);
>
> /* Disable the global synic bit */
> - sctrl.as_uint64 = hv_get_register(HV_REGISTER_SCONTROL);
> + sctrl.as_uint64 = hv_get_msr(HV_MSR_SCONTROL);
> sctrl.enable = 0;
> - hv_set_register(HV_REGISTER_SCONTROL, sctrl.as_uint64);
> + hv_set_msr(HV_MSR_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 ccad7bca3fd3..65c0740484cb 100644
> --- a/drivers/hv/hv_common.c
> +++ b/drivers/hv/hv_common.c
> @@ -228,19 +228,19 @@ 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_msr(HV_MSR_CRASH_P0, 0);
> + hv_set_msr(HV_MSR_CRASH_P1, 0);
> + hv_set_msr(HV_MSR_CRASH_P2, 0);
> + hv_set_msr(HV_MSR_CRASH_P3, virt_to_phys(hv_panic_page));
> + hv_set_msr(HV_MSR_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_CRASH_CTL_CRASH_NOTIFY |
> - HV_CRASH_CTL_CRASH_NOTIFY_MSG));
> + hv_set_msr(HV_MSR_CRASH_CTL,
> + (HV_CRASH_CTL_CRASH_NOTIFY |
> + HV_CRASH_CTL_CRASH_NOTIFY_MSG));
> }
>
> static struct kmsg_dumper hv_kmsg_dumper = {
> @@ -311,7 +311,7 @@ int __init hv_common_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_msr(HV_MSR_CRASH_CTL);
> if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG)
> hv_kmsg_dump_register();
>
> @@ -410,7 +410,7 @@ int hv_common_cpu_init(unsigned int cpu)
> *inputarg = mem;
> }
>
> - msr_vp_index = hv_get_register(HV_REGISTER_VP_INDEX);
> + msr_vp_index = hv_get_msr(HV_MSR_VP_INDEX);
>
> hv_vp_index[cpu] = msr_vp_index;
>
> @@ -507,7 +507,7 @@
> 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_msr(HV_MSR_TIME_REF_COUNT);
> }
>
> u64 (*hv_read_reference_counter)(void) = __hv_read_ref_counter;
> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-
> tlfs.h
> index fdac4a1714ec..3d1b31f90ed6 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -625,6 +625,37 @@ struct hv_retarget_device_interrupt {
> struct hv_device_interrupt_target int_target;
> } __packed __aligned(8);
>
> +/*
> + * These Hyper-V registers provide information equivalent to the CPUID
> + * instruction on x86/x64.
> + */
> +#define HV_REGISTER_HYPERVISOR_VERSION 0x00000100 /*CPUID
> 0x40000002 */
> +#define HV_REGISTER_FEATURES 0x00000200 /*CPUID
> 0x40000003 */
> +#define HV_REGISTER_ENLIGHTENMENTS 0x00000201 /*CPUID
> 0x40000004 */
> +
> +/*
> + * Synthetic register definitions equivalent to MSRs on x86/x64
> + */
> +#define HV_REGISTER_CRASH_P0 0x00000210
> +#define HV_REGISTER_CRASH_P1 0x00000211
> +#define HV_REGISTER_CRASH_P2 0x00000212
> +#define HV_REGISTER_CRASH_P3 0x00000213
> +#define HV_REGISTER_CRASH_P4 0x00000214
> +#define HV_REGISTER_CRASH_CTL 0x00000215
> +
> +#define HV_REGISTER_GUEST_OSID 0x00090002
> +#define HV_REGISTER_VP_INDEX 0x00090003
> +#define HV_REGISTER_TIME_REF_COUNT 0x00090004
> +#define HV_REGISTER_REFERENCE_TSC 0x00090017
> +
> +#define HV_REGISTER_SINT0 0x000A0000
> +#define HV_REGISTER_SCONTROL 0x000A0010
> +#define HV_REGISTER_SIEFP 0x000A0012
> +#define HV_REGISTER_SIMP 0x000A0013
> +#define HV_REGISTER_EOM 0x000A0014
> +
> +#define HV_REGISTER_STIMER0_CONFIG 0x000B0000
> +#define HV_REGISTER_STIMER0_COUNT 0x000B0001
>
> /* HvGetVpRegisters hypercall input with variable size reg name list*/
> struct hv_get_vp_registers_input {
> @@ -640,7 +671,6 @@ struct hv_get_vp_registers_input {
> } element[];
> } __packed;
>
> -
> /* HvGetVpRegisters returns an array of these output elements */
> struct hv_get_vp_registers_output {
> union {
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-
> generic/mshyperv.h
> index cecd2b7bd033..2dc65c1d3117 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -157,7 +157,7 @@ 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_msr(HV_MSR_EOM, 0);
> }
> }
>
> --
> 2.25.1
>
On 2/10/2024 2:37 AM, Michael Kelley wrote:
>
> Overall, this looks good to me. It cleans up the mess I made five
> years ago when first separating x86 from ARM64. :-(
>
> See one comment below, but otherwise,
>
> Reviewed-by: Michael Kelley <[email protected]>
>
Thanks! Responded to your comment below.
>> #if IS_ENABLED(CONFIG_HYPERV)
>> -static inline unsigned int hv_get_nested_reg(unsigned int reg)
>> +static inline unsigned int hv_get_nested_msr(unsigned int reg)
>> {
>> - if (hv_is_sint_reg(reg))
>> - return reg - HV_REGISTER_SINT0 + HV_REGISTER_NESTED_SINT0;
>> + if (hv_is_sint_msr(reg))
>> + return reg - HV_MSR_SINT0 + HV_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_MSR_SIMP:
>> + return HV_MSR_NESTED_SIMP;
>> + case HV_MSR_SIEFP:
>> + return HV_MSR_NESTED_SIEFP;
>> + case HV_MSR_SVERSION:
>> + return HV_MSR_NESTED_SVERSION;
>> + case HV_MSR_SCONTROL:
>> + return HV_MSR_NESTED_SCONTROL;
>> + case HV_MSR_EOM:
>> + return HV_MSR_NESTED_EOM;
>> default:
>> return reg;
>> }
>> }
>
> This function is x86 specific, but you are using the generic HV_MSR_* flavor
> instead of the x86 specific HV_X64_MSR_* flavor like in other x86 specific code.
> Both flavors work, but I wondered if there is any reason for using the generic flavor.
>> I remember debating myself the merits of one approach vs. the other, but I
> don't think there was a solid argument either way. Given that you are
> doing the work to get this all fixed like it should have been originally, I would
> argue for being consistently one way or the other. ARM64 specific code is
> *not* using the generic HV_MSR_* flavor, so I suspect x86 code should not
> either.
>
> Michael
>
I see your point about keeping it consistent within the file.
My thinking was that hv_get_nested_msr is not inherently x86-specific, even though it
lives in arch/x86 today. However, I realize that even if this function *is* moved to
generic code in the future, at that time it could be changed to the generic prefix.
Doing so in this patch could be confusing since it introduces an inconsistency.
So, I will take your advice and keep it HV_X64_MSR_* for everything in this file.
Thanks again!
Nuno