linux-kernel - Re: [REGRESSION][BISECTED] from bd9bbc96e835: cannot boot Win11 KVM guest

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Message-ID: <20241214183924.GC10560@noisy.programming.kicks-ass.net>
Date: Sat, 14 Dec 2024 19:39:24 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Ranguvar <ranguvar@...guvar.io>
Cc: "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
	"regressions@...mhuis.info" <regressions@...mhuis.info>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [REGRESSION][BISECTED] from bd9bbc96e835: cannot boot Win11 KVM
 guest

On Sat, Dec 14, 2024 at 06:30:11AM +0000, Ranguvar wrote:
> Hello, all,
> 
> Any assistance with proper format and process is appreciated as I am
> new to these lists.  After the commit bd9bbc96e835 "sched: Rework
> dl_server" I am no longer able to boot my Windows 11 23H2 guest using
> pinned/exclusive CPU cores and passing a PCIe graphics card.  This
> setup worked for me since at least 5.10, likely earlier, with minimal
> changes.
> 
> Most or all cores assigned to guest VM report 100% usage, and many
> tasks on the host hang indefinitely (10min+) until the guest is
> forcibly stopped.  This happens only once the Windows kernel begins
> loading - its spinner appears and freezes.

Do the patches here:

  https://lkml.kernel.org/r/20241213032244.877029-1-vineeth@bitbyteword.org

help?

I'm not really skilled with the whole virt thing, and I definitely do
not have Windows guests at hand. If the above patches do not work; would
it be possible to share an image or something?