On 10/27/2025 1:28 PM, Praveen K Paladugu wrote: > Without configuing sleep state info within mshv, if a root partition is > shut down, it will try to shutdown by writing to ACPI regions. These > writes are intercepted by mshv and will result in a Machine Check > Exception (MCE). > > Root eventually panics 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 prevent this, properly configure sleep states within MSHV, enable a > reboot notifier, allowing the root partition to cleanly shut down without > any panics. Only S5 sleep state is enabled for now. > > Signed-off-by: Praveen K Paladugu <[email protected]> > Co-developed-by: Anatol Belski <[email protected]> > Signed-off-by: Anatol Belski <[email protected]> > --- > arch/x86/hyperv/hv_init.c | 8 +++ > arch/x86/include/asm/mshyperv.h | 2 + > drivers/hv/mshv_common.c | 103 ++++++++++++++++++++++++++++++++ > 3 files changed, 113 insertions(+) >
Reviewed-by: Easwar Hariharan <[email protected]>
