Merge tag 'hyperv-next-signed-20261028' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linuxHEADmaster

Pull hyperv updates from Wei Liu:

 - Update to documents and code comments (Michael Kelley)

 - Harden Vmbus (Kameron Carr)

 - Rework MSHV driver page deposit logic (Mukesh Rathor)

 - Vmbus kexec bug fix (Shradha Gupta)

 - Miscellaneous bug fixes (Daehyeon Ko, Jiale Yao, Sasha Levin)

* tag 'hyperv-next-signed-20261028' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  Drivers: hv: Remove leftover support for old Hyper-V versions
  mshv: Remove unused *_old memory deposit functions
  mshv: Redesign hypervisor memory deposit logic
  mshv: Rename memory deposit memory functions to _old
  mshv_vtl: reject poll files with multiple waitqueues
  mshv_vtl: detach poll waiter on POLLFREE
  mshv_vtl: initialize poll file mutex before device registration
  Documentation: hyperv: Update information on guest CPU offlining
  Documentation: hyperv: Remove support for guests on Hyper-V 2012/2012R2
  Drivers: hv: Run VMBus kexec cleanup from syscore shutdown
  kexec: Add helper to report an active kexec reboot
  tools: hv: remove unused rte_smp_mb()
  Documentation: hyperv: Update documentation for sending VMBus packets
  Drivers: hv: vmbus: Check ACPI companion before use
  Documentation: hyperv: Describe validation of the ring buffer indices
  Drivers: hv: vmbus: Keep the ring byte counts sane for a bad index
  Drivers: hv: vmbus: Compute ring byte counts from a caller-held snapshot
  Drivers: hv: vmbus: Use *_ONCE() to access shared ring buffer indices
  Drivers: hv: vmbus: Bounds check the shared ring buffer indices

1 files changed, 6 insertions, 21 deletions

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index b4af7c0a70ac..fec1c37dafbf 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -148,7 +148,6 @@ EXPORT_SYMBOL_GPL(hv_set_msr);
 static void (*mshv_handler)(void);
 static void (*vmbus_handler)(void);
 static void (*hv_stimer0_handler)(void);
-static void (*hv_kexec_handler)(void);
 static void (*hv_crash_handler)(struct pt_regs *regs);
 
 DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback)
@@ -215,16 +214,6 @@ void hv_remove_stimer0_handler(void)
 	hv_stimer0_handler = NULL;
 }
 
-void hv_setup_kexec_handler(void (*handler)(void))
-{
-	hv_kexec_handler = handler;
-}
-
-void hv_remove_kexec_handler(void)
-{
-	hv_kexec_handler = NULL;
-}
-
 void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))
 {
 	hv_crash_handler = handler;
@@ -240,17 +229,13 @@ static void hv_machine_shutdown(void)
 {
 	if (kexec_in_progress) {
 		hv_stimer_global_cleanup();
-
-		if (hv_kexec_handler)
-			hv_kexec_handler();
-	}
-
-	/*
-	 * Call hv_cpu_die() on all the CPUs, otherwise later the hypervisor
-	 * corrupts the old VP Assist Pages and can crash the kexec kernel.
-	 */
-	if (kexec_in_progress)
+		/*
+		 * Call hv_cpu_die() on all the CPUs, otherwise later the
+		 * hypervisor corrupts the old VP Assist Pages and can crash
+		 * the kexec kernel.
+		 */
 		cpuhp_remove_state(CPUHP_AP_HYPERV_ONLINE);
+	}
 
 	/* The function calls stop_other_cpus(). */
 	native_machine_shutdown();