From: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
To: Praveen K Paladugu <prapal@linux.microsoft.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org,
hpa@zytor.com, arnd@arndb.de,
easwar.hariharan@linux.microsoft.com,
anbelski@linux.microsoft.com, nunodasneves@linux.microsoft.com,
skinsburskii@linux.microsoft.com
Subject: Re: [PATCH v3 2/2] hyperv: Enable clean shutdown for root partition with MSHV
Date: Mon, 27 Oct 2025 14:19:21 -0700 [thread overview]
Message-ID: <accc901b-999c-46fe-9c44-07cbb4301769@linux.microsoft.com> (raw)
In-Reply-To: <20251027202859.72006-3-prapal@linux.microsoft.com>
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 <prapal@linux.microsoft.com>
> Co-developed-by: Anatol Belski <anbelski@linux.microsoft.com>
> Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
> ---
> 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 <easwar.hariharan@linux.microsoft.com>
next prev parent reply other threads:[~2025-10-27 21:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-27 20:28 [PATCH v3 0/2] Add support for clean shutdown with MSHV Praveen K Paladugu
2025-10-27 20:28 ` [PATCH v3 1/2] hyperv: Add definitions for MSHV sleep state configuration Praveen K Paladugu
2025-10-27 20:28 ` [PATCH v3 2/2] hyperv: Enable clean shutdown for root partition with MSHV Praveen K Paladugu
2025-10-27 21:19 ` Easwar Hariharan [this message]
2025-10-27 20:56 ` [PATCH v3 0/2] Add support for clean shutdown " Easwar Hariharan
2025-10-27 21:11 ` Praveen K Paladugu
2025-10-27 21:13 ` Easwar Hariharan
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