From: Friedrich Weber <f.weber@proxmox.com>
To: Thomas Lamprecht <t.lamprecht@proxmox.com>, pve-devel@lists.proxmox.com
Subject: Re: [pve-devel] applied: [PATCH edk2-firmware v2] fix #6430: backport patch to fix split lock detection warnings
Date: Mon, 14 Jul 2025 09:04:54 +0200 [thread overview]
Message-ID: <290b5527-d136-4898-8f6c-3fb65306dd13@proxmox.com> (raw)
In-Reply-To: <175215442892.1703641.2644485389391494179.b4-ty@proxmox.com>
On 10/07/2025 15:33, Thomas Lamprecht wrote:
> On Thu, 10 Jul 2025 14:50:29 +0200, Friedrich Weber wrote:
>> On host CPUs with the split_lock_detect flag (newer Intel CPUs),
>> booting an OVMF VM with more than one core may trigger the host
>> kernel's split lock detection, as reported in [1].
>>
>> With default settings, a kernel >= 5.19 slows down the corresponding
>> thread for 10ms when it detects a split lock operation, as documented
>> in [2]. A warning is logged, e.g.:
>>
>> [...]
>
> Applied, thanks!
Thanks for the merge!
> But I had to re-export the patch to get the \r\n line endings back, the reason
> for that is that you did not explicitly passed `--transfer-encoding=base64` to
> git send-email as the "auto" default value is seemingly not smart enough to go
> for that encoding when it sees such line endings..
Oops, sorry about that, will keep this in mind for next time with a CRLF
patch.
> btw. you git note suggested to me that you tried this on PVE 9, but you
> at least did not try to build there, as I had to fix a bit of stuff (mostly
> python 3.13 related).
I did mention I only got it to build on bookworm, but forgot to mention
I only tested on bookworm too. My workstation is still on bookworm and I
didn't have any luck getting split-lock detection to work in a nested
setup (even with CPU type 'host', the PVE VM doesn't see the
'split_lock_detect' CPU flag). Should have made this more clear though,
sorry for the confusion.
>
> [1/1] fix #6430: backport patch to fix split lock detection warnings
> commit: 47055b2c7b56fecd84c6441c4f4c419738cc1df8
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next prev parent reply other threads:[~2025-07-14 7:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-10 12:50 [pve-devel] " Friedrich Weber
2025-07-10 13:33 ` [pve-devel] applied: " Thomas Lamprecht
2025-07-14 7:04 ` Friedrich Weber [this message]
2025-07-15 12:05 ` Fiona Ebner
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