[PATCH 2/6] x86/hyperv: move stimer cleanup to hv_machine_shutdown()

Jork Loeser
2026-03-27T20:19:42Z

Move hv_stimer_global_cleanup() from vmbus's hv_kexec_handler() to
hv_machine_shutdown() in the platform code. This ensures stimer cleanup
happens before the vmbus unload, which is required for root partition
kexec to work correctly.

Co-developed-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com>
Signed-off-by: Anirudh Rayabharam <anrayabh@linux.microsoft.com>
Signed-off-by: Jork Loeser <jloeser@linux.microsoft.com>
---
arch/x86/kernel/cpu/mshyperv.c | 8 ++++++--
drivers/hv/vmbus_drv.c | 1 -
2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 89a2eb8a0722..235087456bdf 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -235,8 +235,12 @@ void hv_remove_crash_handler(void)
#ifdef CONFIG_KEXEC_CORE
static void hv_machine_shutdown(void)
{
- if (kexec_in_progress && hv_kexec_handler)
- hv_kexec_handler();
+ 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
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 301273d61892..5d1449f8c6ea 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2892,7 +2892,6 @@ static struct platform_driver vmbus_platform_driver = {

static void hv_kexec_handler(void)
{
- hv_stimer_global_cleanup();
vmbus_initiate_unload(false);
/* Make sure conn_state is set as hv_synic_cleanup checks for it */
mb();
--
2.43.0