From: "H. Peter Anvin" <hpa@zytor.com>
To: Xin Li <xin@zytor.com>, Sohil Mehta <sohil.mehta@intel.com>
Cc: kvm@vger.kernel.org, x86@kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Nikunj A Dadhania <nikunj@amd.com>,
Shivansh Dhiman <shivansh.dhiman@amd.com>,
David Woodhouse <dwmw@amazon.co.uk>,
Chao Gao <chao.gao@intel.com>,
Binbin Wu <binbin.wu@linux.intel.com>,
Zhao Liu <zhao1.liu@intel.com>, Yosry Ahmed <yosry@kernel.org>,
David Matlack <dmatlack@google.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v10 00/28] KVM: Enable FRED support with KVM VMX
Date: Sat, 24 Oct 2026 15:59:37 -0700 [thread overview]
Message-ID: <9467c7b6-d797-4462-bee1-1406bb8469cd@zytor.com> (raw)
In-Reply-To: <E7D55C5F-91DF-45AC-BCC8-BD2759CEE0C4@zytor.com>
On 2026-09-14 23:03, Xin Li wrote:
>
>> On Sep 11, 2026, at 2:36 PM, Sohil Mehta <sohil.mehta@intel.com> wrote:
>>
>> I mainly rebased the patches to the latest kvm-x86/next branch and fixed
>> a handful of issues reported during internal testing and basic AI
>> reviews. I've avoided making any major code changes or commit message
>> updates as this is the first iteration that I am posting.
>
> Thanks a lot for taking care of the patch series.
>
>>
>> Going forward, based on the feedback, I'll rework the patches as needed.
>> I've listed a few opens below that need additional discussion or
>> clarification. I'm relatively new to the KVM subsystem, so please feel
>> free to provide suggestions on the series structure, code organization
>> as well as commit log clarity to smoothen the review process.
>
> I’ve been thinking about an optimization: because FRED drops most of the old
> syscall MSRs (IA32_LSTAR/IA32_CSTAR/IA32_SFMASK), we should be able to omit
> them from KVM's uret MSR tracking entirely as if host enables FRED (no matter
> whether a guest uses FRED).
>
Yes, although they will need to be handled properly between VCPU switches, of
course.
-hpa
next prev parent reply other threads:[~2026-10-24 23:00 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-11 21:36 Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 01/28] KVM: VMX: Enable support for secondary VM exit controls Sohil Mehta
2026-10-22 9:27 ` Binbin Wu
2026-10-23 2:09 ` Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 02/28] KVM: VMX: Initialize VM entry/exit FRED controls in vmcs_config Sohil Mehta
2026-10-22 9:48 ` Binbin Wu
2026-10-23 3:10 ` Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 03/28] KVM: VMX: Disable FRED if FRED consistency checks fail Sohil Mehta
2026-10-22 10:19 ` Binbin Wu
2026-10-23 3:13 ` Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 04/28] x86/cea: Prefix event stack names with ESTACK_ Sohil Mehta
2026-10-23 5:58 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 05/28] x86/cea: Use array indexing to simplify exception stack access Sohil Mehta
2026-10-23 6:07 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 06/28] x86/fred: Export this_cpu_fred_rsp() for KVM usage Sohil Mehta
2026-10-23 6:49 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 07/28] KVM: VMX: Initialize VMCS FRED fields Sohil Mehta
2026-10-23 7:19 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 08/28] KVM: VMX: Set FRED MSR intercepts Sohil Mehta
2026-10-23 8:07 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 09/28] KVM: VMX: Save/restore guest FRED RSP0 Sohil Mehta
2026-09-14 7:04 ` Binbin Wu
2026-09-14 16:14 ` Edgecombe, Rick P
2026-09-15 8:43 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 10/28] KVM: VMX: Add support for saving and restoring FRED MSRs Sohil Mehta
2026-10-23 8:59 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 11/28] KVM: x86: Add a helper to detect if FRED is enabled for a vCPU Sohil Mehta
2026-10-23 9:21 ` Binbin Wu
2026-09-11 21:36 ` [PATCH v10 12/28] KVM: x86: Add a new save/restore flag for FRED metadata Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 13/28] KVM: VMX: Virtualize FRED nested exception tracking Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 14/28] KVM: VMX: Virtualize FRED event_data Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 15/28] KVM: x86: Include CR4.FRED in the emulator CR4 write mask Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 16/28] KVM: x86: Mark CR4.FRED as not reserved Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 17/28] KVM: x86: Handle CR4.FRED when emulating RSM Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 18/28] KVM: VMX: Dump FRED context in dump_vmcs() Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 19/28] KVM: x86: Advertise support for FRED Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 20/28] KVM: nVMX: Enable support for secondary VM exit controls Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 21/28] KVM: nVMX: Handle FRED VMCS fields in nested VMX context Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 22/28] KVM: nVMX: Restrict event data VMCS fields to FRED-supported hosts Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 23/28] KVM: nVMX: Shadow ORIGINAL_EVENT_DATA and INJECTED_EVENT_DATA fields Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 24/28] KVM: nVMX: Validate FRED-related VMCS fields Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 25/28] KVM: nVMX: Enable VMX FRED controls Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 26/28] KVM: selftests: Add FRED MSRs to msrs_test Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 27/28] KVM: selftests: Add a new VM guest mode to run user level code Sohil Mehta
2026-09-11 21:36 ` [PATCH v10 28/28] KVM: selftests: Add fred exception tests Sohil Mehta
2026-09-15 6:03 ` [PATCH v10 00/28] KVM: Enable FRED support with KVM VMX Xin Li
2026-10-24 22:59 ` H. Peter Anvin [this message]
2026-09-15 10:00 ` [EXTERNAL] " David Woodhouse
2026-09-24 11:14 ` Shivansh Dhiman
2026-09-24 14:13 ` David Woodhouse
2026-09-25 12:06 ` Shivansh Dhiman
2026-10-19 20:46 ` Dave Hansen
2026-10-19 22:19 ` Sohil Mehta
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