From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Jim Mattson <jmattson@google.com>, Chao Gao <chao.gao@intel.com>
Cc: Sean Christopherson <seanjc@google.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,
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: Sat, 13 Jun 2026 11:03:16 +0800 [thread overview]
Message-ID: <141a4dff-adb8-4af0-b25c-f87b2189cbae@intel.com> (raw)
In-Reply-To: <CALMp9eQYc0AGjuVqCHL-GGe2cLOCnYZhTso=50HihdxTmNShWw@mail.gmail.com>
On 6/13/2026 6:51 AM, Jim Mattson wrote:
> On Thu, Jun 4, 2026 at 10:56 PM Chao Gao <chao.gao@intel.com> wrote:
>>
>> On Thu, Jun 04, 2026 at 10:34:40PM -0700, Jim Mattson wrote:
> ...
>>> With respect to EMR, you wrote previously, "A mitigation for this
>>> erratum is for software to program the VMX preemption timer for values
>>> below 2^25 * CPUID.15H:EBX[31:0] / CPUID.15H:EAX[31:0]."
>>>
>>> My question is whether the exponent, 25, is a fixed value for all
>>> CPUs, regardless of their IA32_VMX_MISC[4:0]. It sounds like you are
>>> saying that the exponent may depend on IA32_VMX_MISC[4:0].
>>
>> Let me double-check this with the internal team and get back to you.
>
> Have you discovered anything?
Chao is on vacation, let's wait one more week.
next prev parent reply other threads:[~2026-06-13 3:03 UTC|newest]
Thread overview: 24+ 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
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
2026-06-12 22:51 ` Jim Mattson
2026-06-13 3:03 ` Xiaoyao Li [this message]
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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