From: Sean Christopherson <seanjc@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@kernel.org>,
Jim Mattson <jmattson@google.com>,
Binbin Wu <binbin.wu@linux.intel.com>,
Vishal L Verma <vishal.l.verma@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Rick P Edgecombe <rick.p.edgecombe@intel.com>,
Binbin Wu <binbin.wu@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
Paolo Bonzini <bonzini@redhat.com>
Subject: Re: CPU Lockups in KVM with deferred hrtimer rearming
Date: Wed, 22 Apr 2026 06:47:19 -0700 [thread overview]
Message-ID: <aejRZ3CIaHLogTRL@google.com> (raw)
In-Reply-To: <20260422065542.GN3126523@noisy.programming.kicks-ass.net>
On Wed, Apr 22, 2026, Peter Zijlstra wrote:
> On Tue, Apr 21, 2026 at 02:42:46PM -0700, Sean Christopherson wrote:
> > On Tue, Apr 21, 2026, Peter Zijlstra wrote:
> > > On Tue, Apr 21, 2026 at 08:57:24PM +0000, Sean Christopherson wrote:
> > > > This as delta? (I had typed this all up before Peter posted a new verison, so
> > > > dammit I'm sending it!)
> > >
> > > :-)
> > >
> > > I'll go stare at it in the morning, I'm about to go crash out.
> >
> > New delta against your effective v2, builds all of my configs (which isn't _that_
> > many, but I think they cover most of the weirder ways to include KVM (or not)).
> >
> > I'll start testing the full thing to try and get early signal on the health.
>
> Oh, re-reading commit 28d11e4548b7, I think this wrecks NMIs. The patch
> will also use the FRED NMI path and that's not good when running IDT.
Oof, good catch. Which in turn explains why KVM's VMX_DO_EVENT_IRQOFF still uses
CONFIG_X86_64 instead of CONFIG_X86_FRED.
next prev parent reply other threads:[~2026-04-22 13:47 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-16 20:50 CPU Lockups in KVM with deferred hrtimer rearming Verma, Vishal L
2026-04-20 15:00 ` Thomas Gleixner
2026-04-20 15:22 ` Thomas Gleixner
2026-04-20 20:57 ` Verma, Vishal L
2026-04-20 22:19 ` Thomas Gleixner
2026-04-20 22:24 ` Verma, Vishal L
2026-04-21 6:29 ` Thomas Gleixner
2026-04-21 4:51 ` Binbin Wu
2026-04-21 7:39 ` Thomas Gleixner
2026-04-21 11:18 ` Peter Zijlstra
2026-04-21 11:32 ` Peter Zijlstra
2026-04-21 11:34 ` Peter Zijlstra
2026-04-21 11:49 ` Peter Zijlstra
2026-04-21 12:05 ` Peter Zijlstra
2026-04-21 13:19 ` Peter Zijlstra
2026-04-21 13:29 ` Peter Zijlstra
2026-04-21 16:36 ` Thomas Gleixner
2026-04-21 18:11 ` Verma, Vishal L
2026-04-21 17:11 ` Thomas Gleixner
2026-04-21 17:20 ` Jim Mattson
2026-04-21 18:29 ` Thomas Gleixner
2026-04-21 18:55 ` Sean Christopherson
2026-04-21 20:06 ` Peter Zijlstra
2026-04-21 20:46 ` Peter Zijlstra
2026-04-21 20:57 ` Sean Christopherson
2026-04-21 21:02 ` Peter Zijlstra
2026-04-21 21:42 ` Sean Christopherson
2026-04-22 6:55 ` Peter Zijlstra
2026-04-22 7:46 ` Peter Zijlstra
2026-04-22 14:08 ` Peter Zijlstra
2026-04-22 15:26 ` Sean Christopherson
2026-04-22 19:13 ` Verma, Vishal L
2026-04-22 22:57 ` Thomas Gleixner
2026-04-23 15:23 ` Peter Zijlstra
2026-04-22 13:47 ` Sean Christopherson [this message]
2026-04-21 20:39 ` Paolo Bonzini
2026-04-21 21:02 ` Sean Christopherson
2026-04-21 22:48 ` Thomas Gleixner
2026-04-21 23:15 ` Paolo Bonzini
2026-04-21 23:34 ` Jim Mattson
2026-04-21 23:37 ` Paolo Bonzini
2026-04-22 2:10 ` Thomas Gleixner
2026-04-21 21:49 ` Thomas Gleixner
2026-04-21 22:07 ` Sean Christopherson
2026-04-21 22:24 ` Paolo Bonzini
2026-04-21 19:18 ` Verma, Vishal L
2026-04-21 16:30 ` Thomas Gleixner
2026-04-21 16:11 ` Verma, Vishal L
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