Merge tag 'hyperv-next-signed-20210831' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv updates from Wei Liu:

 - make Hyper-V code arch-agnostic (Michael Kelley)

 - fix sched_clock behaviour on Hyper-V (Ani Sinha)

 - fix a fault when Linux runs as the root partition on MSHV (Praveen
   Kumar)

 - fix VSS driver (Vitaly Kuznetsov)

 - cleanup (Sonia Sharma)

* tag 'hyperv-next-signed-20210831' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  hv_utils: Set the maximum packet size for VSS driver to the length of the receive buffer
  Drivers: hv: Enable Hyper-V code to be built on ARM64
  arm64: efi: Export screen_info
  arm64: hyperv: Initialize hypervisor on boot
  arm64: hyperv: Add panic handler
  arm64: hyperv: Add Hyper-V hypercall and register access utilities
  x86/hyperv: fix root partition faults when writing to VP assist page MSR
  hv: hyperv.h: Remove unused inline functions
  drivers: hv: Decouple Hyper-V clock/timer code from VMbus drivers
  x86/hyperv: add comment describing TSC_INVARIANT_CONTROL MSR setting bit 0
  Drivers: hv: Move Hyper-V misc functionality to arch-neutral code
  Drivers: hv: Add arch independent default functions for some Hyper-V handlers
  Drivers: hv: Make portions of Hyper-V init code be arch neutral
  x86/hyperv: fix for unwanted manipulation of sched_clock when TSC marked unstable
  asm-generic/hyperv: Add missing #include of nmi.h

3 files changed, 22 insertions, 18 deletions

diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 9a000ba2bb75..c1ab6a6e72b5 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -22,6 +22,7 @@
 #include <linux/atomic.h>
 #include <linux/bitops.h>
 #include <linux/cpumask.h>
+#include <linux/nmi.h>
 #include <asm/ptrace.h>
 #include <asm/hyperv-tlfs.h>
 
@@ -38,6 +39,9 @@ struct ms_hyperv_info {
 };
 extern struct ms_hyperv_info ms_hyperv;
 
+extern void  __percpu  **hyperv_pcpu_input_arg;
+extern void  __percpu  **hyperv_pcpu_output_arg;
+
 extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
 extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
 
@@ -151,6 +155,8 @@ void hv_remove_crash_handler(void);
 extern int vmbus_interrupt;
 extern int vmbus_irq;
 
+extern bool hv_root_partition;
+
 #if IS_ENABLED(CONFIG_HYPERV)
 /*
  * Hypervisor's notion of virtual processor ID is different from
@@ -161,9 +167,16 @@ extern int vmbus_irq;
 extern u32 *hv_vp_index;
 extern u32 hv_max_vp_index;
 
+extern u64 (*hv_read_reference_counter)(void);
+
 /* Sentinel value for an uninitialized entry in hv_vp_index array */
 #define VP_INVAL	U32_MAX
 
+int __init hv_common_init(void);
+void __init hv_common_free(void);
+int hv_common_cpu_init(unsigned int cpu);
+int hv_common_cpu_die(unsigned int cpu);
+
 void *hv_alloc_hyperv_page(void);
 void *hv_alloc_hyperv_zeroed_page(void);
 void hv_free_hyperv_page(unsigned long addr);
diff --git a/include/clocksource/hyperv_timer.h b/include/clocksource/hyperv_timer.h
index b6774aa5a4b8..b3f5d73ae1d6 100644
--- a/include/clocksource/hyperv_timer.h
+++ b/include/clocksource/hyperv_timer.h
@@ -20,6 +20,8 @@
 #define HV_MAX_MAX_DELTA_TICKS 0xffffffff
 #define HV_MIN_DELTA_TICKS 1
 
+#ifdef CONFIG_HYPERV_TIMER
+
 /* Routines called by the VMbus driver */
 extern int hv_stimer_alloc(bool have_percpu_irqs);
 extern int hv_stimer_cleanup(unsigned int cpu);
@@ -28,8 +30,6 @@ extern void hv_stimer_legacy_cleanup(unsigned int cpu);
 extern void hv_stimer_global_cleanup(void);
 extern void hv_stimer0_isr(void);
 
-#ifdef CONFIG_HYPERV_TIMER
-extern u64 (*hv_read_reference_counter)(void);
 extern void hv_init_clocksource(void);
 
 extern struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
@@ -100,6 +100,13 @@ static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
 {
 	return U64_MAX;
 }
+
+static inline int hv_stimer_cleanup(unsigned int cpu) { return 0; }
+static inline void hv_stimer_legacy_init(unsigned int cpu, int sint) {}
+static inline void hv_stimer_legacy_cleanup(unsigned int cpu) {}
+static inline void hv_stimer_global_cleanup(void) {}
+static inline void hv_stimer0_isr(void) {}
+
 #endif /* CONFIG_HYPERV_TIMER */
 
 #endif
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2e859d2f9609..ddc8713ce57b 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -538,12 +538,6 @@ struct vmbus_channel_rescind_offer {
 	u32 child_relid;
 } __packed;
 
-static inline u32
-hv_ringbuffer_pending_size(const struct hv_ring_buffer_info *rbi)
-{
-	return rbi->ring_buffer->pending_send_sz;
-}
-
 /*
  * Request Offer -- no parameters, SynIC message contains the partition ID
  * Set Snoop -- no parameters, SynIC message contains the partition ID
@@ -1092,16 +1086,6 @@ static inline void set_channel_pending_send_size(struct vmbus_channel *c,
 	c->outbound.ring_buffer->pending_send_sz = size;
 }
 
-static inline void set_low_latency_mode(struct vmbus_channel *c)
-{
-	c->low_latency = true;
-}
-
-static inline void clear_low_latency_mode(struct vmbus_channel *c)
-{
-	c->low_latency = false;
-}
-
 void vmbus_onmessage(struct vmbus_channel_message_header *hdr);
 
 int vmbus_request_offers(void);