From: Sean Christopherson <seanjc@google.com>
To: Jim Mattson <jmattson@google.com>
Cc: Chao Gao <chao.gao@intel.com>,
Reinette Chatre <reinette.chatre@intel.com>,
isaku.yamahata@intel.com, pbonzini@redhat.com,
erdemaktas@google.com, vkuznets@redhat.com,
vannapurve@google.com, mlevitsk@redhat.com,
xiaoyao.li@intel.com, rick.p.edgecombe@intel.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
chenyi.qiang@intel.com, Yosry Ahmed <yosry@kernel.org>
Subject: Re: VMX Preemption Timer appears to be buggy on SKX, CLX, and ICX
Date: Thu, 4 Jun 2026 12:58:41 -0700 [thread overview]
Message-ID: <aiHY8cWZYZNb-DED@google.com> (raw)
In-Reply-To: <CALMp9eSqqsEzd5MSeO46EdC8aOwhyhU7e2bOW2LSdnDQGXEVpw@mail.gmail.com>
On Wed, Jun 03, 2026, Jim Mattson wrote:
> On Thu, May 14, 2026 at 11:35 PM Chao Gao <chao.gao@intel.com> wrote:
> >
> > >> EMR158. VMX-Preemption Timer May Expire Earlier With Certain Large Timer Values
> > >
> > >I assume the same erratum applies to previous generations as well?
> >
> > Yes.
>
> This test still fails on our SKX, CLX, and ICX systems.
>
> Sean,
>
> Were you thinking of enforcing a cap on delta_tsc in vmx_set_hv_timer()?
Heh, to be honest, I wasn't thinking of a whole lot of nothing. Falling back to
hrtimers does seem like the easiest solution.
next prev parent reply other threads:[~2026-06-04 19:58 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-12 18:16 [PATCH V9 0/2] KVM: x86: Make bus clock frequency for vAPIC timer configurable Reinette Chatre
2024-06-12 18:16 ` [PATCH V9 1/2] KVM: selftests: Add x86_64 guest udelay() utility Reinette Chatre
2024-06-28 22:46 ` Sean Christopherson
2024-06-12 18:16 ` [PATCH V9 2/2] KVM: selftests: Add test for configure of x86 APIC bus frequency Reinette Chatre
2024-06-28 22:50 ` Sean Christopherson
2024-06-29 0:39 ` VMX Preemption Timer appears to be buggy on SKX, CLX, and ICX Sean Christopherson
2024-07-03 20:14 ` Reinette Chatre
2024-07-03 21:37 ` Reinette Chatre
2024-07-08 5:55 ` Yuan Yao
2026-05-13 1:31 ` Chao Gao
2026-05-14 21:09 ` Sean Christopherson
2026-05-15 6:34 ` Chao Gao
2026-06-04 5:09 ` Jim Mattson
2026-06-04 19:58 ` Sean Christopherson [this message]
2026-06-04 21:59 ` Jim Mattson
2026-06-05 2:56 ` Chao Gao
2026-06-05 5:34 ` Jim Mattson
2026-06-05 5:56 ` Chao Gao
2024-06-28 22:55 ` [PATCH V9 0/2] KVM: x86: Make bus clock frequency for vAPIC timer configurable Sean Christopherson
2024-06-29 0:10 ` Reinette Chatre
2024-07-10 15:42 ` Sean Christopherson
2024-07-10 17:14 ` Reinette Chatre
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