Merge tag 'hyperv-next-signed-20210426' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull Hyper-V updates from Wei Liu:

 - VMBus enhancement

 - Free page reporting support for Hyper-V balloon driver

 - Some patches for running Linux as Arm64 Hyper-V guest

 - A few misc clean-up patches

* tag 'hyperv-next-signed-20210426' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (30 commits)
  drivers: hv: Create a consistent pattern for checking Hyper-V hypercall status
  x86/hyperv: Move hv_do_rep_hypercall to asm-generic
  video: hyperv_fb: Add ratelimit on error message
  Drivers: hv: vmbus: Increase wait time for VMbus unload
  Drivers: hv: vmbus: Initialize unload_event statically
  Drivers: hv: vmbus: Check for pending channel interrupts before taking a CPU offline
  Drivers: hv: vmbus: Drivers: hv: vmbus: Introduce CHANNELMSG_MODIFYCHANNEL_RESPONSE
  Drivers: hv: vmbus: Introduce and negotiate VMBus protocol version 5.3
  Drivers: hv: vmbus: Use after free in __vmbus_open()
  Drivers: hv: vmbus: remove unused function
  Drivers: hv: vmbus: Remove unused linux/version.h header
  x86/hyperv: remove unused linux/version.h header
  x86/Hyper-V: Support for free page reporting
  x86/hyperv: Fix unused variable 'hi' warning in hv_apic_read
  x86/hyperv: Fix unused variable 'msr_val' warning in hv_qlock_wait
  hv: hyperv.h: a few mundane typo fixes
  drivers: hv: Fix EXPORT_SYMBOL and tab spaces issue
  Drivers: hv: vmbus: Drop error message when 'No request id available'
  asm-generic/hyperv: Add missing function prototypes per -W1 warnings
  clocksource/drivers/hyper-v: Move handling of STIMER0 interrupts
  ...

2 files changed, 75 insertions, 156 deletions

diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index e6cd3fee562b..606f5cc579b2 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -156,7 +156,7 @@ enum hv_isolation_type {
 #define HV_X64_MSR_HYPERCALL			0x40000001
 
 /* MSR used to provide vcpu index */
-#define HV_X64_MSR_VP_INDEX			0x40000002
+#define HV_REGISTER_VP_INDEX			0x40000002
 
 /* MSR used to reset the guest OS. */
 #define HV_X64_MSR_RESET			0x40000003
@@ -165,10 +165,10 @@ enum hv_isolation_type {
 #define HV_X64_MSR_VP_RUNTIME			0x40000010
 
 /* MSR used to read the per-partition time reference counter */
-#define HV_X64_MSR_TIME_REF_COUNT		0x40000020
+#define HV_REGISTER_TIME_REF_COUNT		0x40000020
 
 /* A partition's reference time stamp counter (TSC) page */
-#define HV_X64_MSR_REFERENCE_TSC		0x40000021
+#define HV_REGISTER_REFERENCE_TSC		0x40000021
 
 /* MSR used to retrieve the TSC frequency */
 #define HV_X64_MSR_TSC_FREQUENCY		0x40000022
@@ -183,50 +183,50 @@ enum hv_isolation_type {
 #define HV_X64_MSR_VP_ASSIST_PAGE		0x40000073
 
 /* Define synthetic interrupt controller model specific registers. */
-#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 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
 
 /*
  * Synthetic Timer MSRs. Four timers per vcpu.
  */
-#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
+#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
 
 /* Hyper-V guest idle MSR */
 #define HV_X64_MSR_GUEST_IDLE			0x400000F0
 
 /* Hyper-V guest crash notification MSR's */
-#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
+#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
 
 /* TSC emulation after migration */
 #define HV_X64_MSR_REENLIGHTENMENT_CONTROL	0x40000106
@@ -236,6 +236,32 @@ 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
+
 /*
  * Declare the MSR used to setup pages used to communicate with the hypervisor.
  */
@@ -288,35 +314,6 @@ struct hv_tsc_emulation_status {
 #define HV_X64_MSR_TSC_REFERENCE_ENABLE		0x00000001
 #define HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT	12
 
-
-/* Define hypervisor message types. */
-enum hv_message_type {
-	HVMSG_NONE			= 0x00000000,
-
-	/* Memory access messages. */
-	HVMSG_UNMAPPED_GPA		= 0x80000000,
-	HVMSG_GPA_INTERCEPT		= 0x80000001,
-
-	/* Timer notification messages. */
-	HVMSG_TIMER_EXPIRED		= 0x80000010,
-
-	/* Error messages. */
-	HVMSG_INVALID_VP_REGISTER_VALUE	= 0x80000020,
-	HVMSG_UNRECOVERABLE_EXCEPTION	= 0x80000021,
-	HVMSG_UNSUPPORTED_FEATURE	= 0x80000022,
-
-	/* Trace buffer complete messages. */
-	HVMSG_EVENTLOG_BUFFERCOMPLETE	= 0x80000040,
-
-	/* Platform-specific processor intercept messages. */
-	HVMSG_X64_IOPORT_INTERCEPT	= 0x80010000,
-	HVMSG_X64_MSR_INTERCEPT		= 0x80010001,
-	HVMSG_X64_CPUID_INTERCEPT	= 0x80010002,
-	HVMSG_X64_EXCEPTION_INTERCEPT	= 0x80010003,
-	HVMSG_X64_APIC_EOI		= 0x80010004,
-	HVMSG_X64_LEGACY_FP_ERROR	= 0x80010005
-};
-
 struct hv_nested_enlightenments_control {
 	struct {
 		__u32 directhypercall:1;
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index e7be720062a8..67ff0d637e55 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -9,70 +9,29 @@
 #include <asm/hyperv-tlfs.h>
 #include <asm/nospec-branch.h>
 #include <asm/paravirt.h>
+#include <asm/mshyperv.h>
 
 typedef int (*hyperv_fill_flush_list_func)(
 		struct hv_guest_mapping_flush_list *flush,
 		void *data);
 
-#define hv_init_timer(timer, tick) \
-	wrmsrl(HV_X64_MSR_STIMER0_COUNT + (2*timer), tick)
-#define hv_init_timer_config(timer, val) \
-	wrmsrl(HV_X64_MSR_STIMER0_CONFIG + (2*timer), val)
-
-#define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
-#define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
-
-#define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
-#define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
-
-#define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
-#define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
-
-#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
-
-#define hv_signal_eom() wrmsrl(HV_X64_MSR_EOM, 0)
-
-#define hv_get_synint_state(int_num, val) \
-	rdmsrl(HV_X64_MSR_SINT0 + int_num, val)
-#define hv_set_synint_state(int_num, val) \
-	wrmsrl(HV_X64_MSR_SINT0 + int_num, val)
-#define hv_recommend_using_aeoi() \
-	(!(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED))
+static inline void hv_set_register(unsigned int reg, u64 value)
+{
+	wrmsrl(reg, value);
+}
 
-#define hv_get_crash_ctl(val) \
-	rdmsrl(HV_X64_MSR_CRASH_CTL, val)
+static inline u64 hv_get_register(unsigned int reg)
+{
+	u64 value;
 
-#define hv_get_time_ref_count(val) \
-	rdmsrl(HV_X64_MSR_TIME_REF_COUNT, val)
+	rdmsrl(reg, value);
+	return value;
+}
 
-#define hv_get_reference_tsc(val) \
-	rdmsrl(HV_X64_MSR_REFERENCE_TSC, val)
-#define hv_set_reference_tsc(val) \
-	wrmsrl(HV_X64_MSR_REFERENCE_TSC, val)
-#define hv_set_clocksource_vdso(val) \
-	((val).vdso_clock_mode = VDSO_CLOCKMODE_HVCLOCK)
-#define hv_enable_vdso_clocksource() \
-	vclocks_set_used(VDSO_CLOCKMODE_HVCLOCK);
 #define hv_get_raw_timer() rdtsc_ordered()
-#define hv_get_vector() HYPERVISOR_CALLBACK_VECTOR
-
-/*
- * Reference to pv_ops must be inline so objtool
- * detection of noinstr violations can work correctly.
- */
-static __always_inline void hv_setup_sched_clock(void *sched_clock)
-{
-#ifdef CONFIG_PARAVIRT
-	paravirt_set_sched_clock(sched_clock);
-#endif
-}
 
 void hyperv_vector_handler(struct pt_regs *regs);
 
-static inline void hv_enable_stimer0_percpu_irq(int irq) {}
-static inline void hv_disable_stimer0_percpu_irq(int irq) {}
-
-
 #if IS_ENABLED(CONFIG_HYPERV)
 extern int hyperv_init_cpuhp;
 
@@ -189,38 +148,6 @@ static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
 	return hv_status;
 }
 
-/*
- * Rep hypercalls. Callers of this functions are supposed to ensure that
- * rep_count and varhead_size comply with Hyper-V hypercall definition.
- */
-static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
-				      void *input, void *output)
-{
-	u64 control = code;
-	u64 status;
-	u16 rep_comp;
-
-	control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
-	control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
-
-	do {
-		status = hv_do_hypercall(control, input, output);
-		if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
-			return status;
-
-		/* Bits 32-43 of status have 'Reps completed' data. */
-		rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
-			HV_HYPERCALL_REP_COMP_OFFSET;
-
-		control &= ~HV_HYPERCALL_REP_START_MASK;
-		control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
-
-		touch_nmi_watchdog();
-	} while (rep_comp < rep_count);
-
-	return status;
-}
-
 extern struct hv_vp_assist_page **hv_vp_assist_page;
 
 static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
@@ -233,9 +160,6 @@ static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
 
 void __init hyperv_init(void);
 void hyperv_setup_mmu_ops(void);
-void *hv_alloc_hyperv_page(void);
-void *hv_alloc_hyperv_zeroed_page(void);
-void hv_free_hyperv_page(unsigned long addr);
 void set_hv_tscchange_cb(void (*cb)(void));
 void clear_hv_tscchange_cb(void);
 void hyperv_stop_tsc_emulation(void);
@@ -272,8 +196,6 @@ int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
 #else /* CONFIG_HYPERV */
 static inline void hyperv_init(void) {}
 static inline void hyperv_setup_mmu_ops(void) {}
-static inline void *hv_alloc_hyperv_page(void) { return NULL; }
-static inline void hv_free_hyperv_page(unsigned long addr) {}
 static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
 static inline void clear_hv_tscchange_cb(void) {}
 static inline void hyperv_stop_tsc_emulation(void) {};