diff options
| author | Praveen K Paladugu <prapal@linux.microsoft.com> | 2025-12-05 14:17:08 -0600 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-12-05 23:25:05 +0000 |
| commit | 615a6e7d83f958e7ef3bc818e818f7c6433b4c2a (patch) | |
| tree | ae95a5a3954e78ad036540fc1199cdd2cd40e009 | |
| parent | f0be2600ac55a5845d536c56787daca50dbcb2a1 (diff) | |
mshv: Cleanly shutdown root partition with MSHV
Root partitions running on MSHV currently attempt ACPI power-off, which
MSHV intercepts and triggers a Machine Check Exception (MCE), leading
to a kernel panic.
Root partitions panic with a trace similar to:
[ 81.306348] reboot: Power down
[ 81.314709] mce: [Hardware Error]: CPU 0: Machine Check Exception: 4 Bank 0: b2000000c0060001
[ 81.314711] mce: [Hardware Error]: TSC 3b8cb60a66 PPIN 11d98332458e4ea9
[ 81.314713] mce: [Hardware Error]: PROCESSOR 0:606a6 TIME 1759339405 SOCKET 0 APIC 0 microcode ffffffff
[ 81.314715] mce: [Hardware Error]: Run the above through 'mcelog --ascii'
[ 81.314716] mce: [Hardware Error]: Machine check: Processor context corrupt
[ 81.314717] Kernel panic - not syncing: Fatal machine check
To avoid this, configure the sleep state in the hypervisor and invoke
the HVCALL_ENTER_SLEEP_STATE hypercall as the final step in the shutdown
sequence. This ensures a clean and safe shutdown of the root partition.
Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>
Co-developed-by: Anatol Belski <anbelski@linux.microsoft.com>
Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
Acked-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
| -rw-r--r-- | arch/x86/include/asm/mshyperv.h | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 2 | ||||
| -rw-r--r-- | drivers/hv/mshv_common.c | 21 |
3 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 62a89debfbce..eef4c3a5ba28 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -178,6 +178,7 @@ int hyperv_fill_flush_guest_mapping_list( struct hv_guest_mapping_flush_list *flush, u64 start_gfn, u64 end_gfn); void hv_sleep_notifiers_register(void); +void hv_machine_power_off(void); #ifdef CONFIG_X86_64 void hv_apic_init(void); diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index fac9953a72ef..579fb2c64cfd 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -621,6 +621,8 @@ static void __init ms_hyperv_init_platform(void) #endif #if IS_ENABLED(CONFIG_HYPERV) + if (hv_root_partition()) + machine_ops.power_off = hv_machine_power_off; #if defined(CONFIG_KEXEC_CORE) machine_ops.shutdown = hv_machine_shutdown; #endif diff --git a/drivers/hv/mshv_common.c b/drivers/hv/mshv_common.c index ee733ba1575e..58027b23c206 100644 --- a/drivers/hv/mshv_common.c +++ b/drivers/hv/mshv_common.c @@ -216,3 +216,24 @@ void hv_sleep_notifiers_register(void) pr_err("%s: cannot register reboot notifier %d\n", __func__, ret); } + +/* + * Power off the machine by entering S5 sleep state via Hyper-V hypercall. + * This call does not return if successful. + */ +void hv_machine_power_off(void) +{ + unsigned long flags; + struct hv_input_enter_sleep_state *in; + + local_irq_save(flags); + in = *this_cpu_ptr(hyperv_pcpu_input_arg); + in->sleep_state = HV_SLEEP_STATE_S5; + + (void)hv_do_hypercall(HVCALL_ENTER_SLEEP_STATE, in, NULL); + local_irq_restore(flags); + + /* should never reach here */ + BUG(); + +} |