linux-kernel - Re: [ANNOUNCE] KVM Microconference at LPC 2024

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Message-ID: <8d1c178c-476e-4713-8efb-9d9f8b143af5@amd.com>
Date: Wed, 3 Apr 2024 16:53:24 +0530
From: Sandipan Das <sandipan.das@....com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 David Hildenbrand <david@...hat.com>, David Stevens <stevensd@...omium.org>,
 Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
 Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>,
 Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
 <yuzenghui@...wei.com>, Huacai Chen <chenhuacai@...nel.org>,
 Tianrui Zhao <zhaotianrui@...ngson.cn>, Bibo Mao <maobibo@...ngson.cn>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Anup Patel <anup@...infault.org>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Janosch Frank <frankja@...ux.ibm.com>,
 Claudio Imbrenda <imbrenda@...ux.ibm.com>, Xiaoyao Li
 <xiaoyao.li@...el.com>, Xu Yilun <yilun.xu@...el.com>,
 Chao Peng <chao.p.peng@...ux.intel.com>, Fuad Tabba <tabba@...gle.com>,
 Jim Mattson <jmattson@...gle.com>, Jarkko Sakkinen <jarkko@...nel.org>,
 Maxim Levitsky <mlevitsk@...hat.com>, Anish Moorthy <amoorthy@...gle.com>,
 David Matlack <dmatlack@...gle.com>, Yu Zhang <yu.c.zhang@...ux.intel.com>,
 Isaku Yamahata <isaku.yamahata@...el.com>, Edgecombe@...gle.com,
 Rick P <rick.p.edgecombe@...el.com>, Mickaël Salaün
 <mic@...ikod.net>, Vlastimil Babka <vbabka@...e.cz>,
 Vishal Annapurve <vannapurve@...gle.com>,
 Ackerley Tng <ackerleytng@...gle.com>,
 Maciej Szmigiero <mail@...iej.szmigiero.name>,
 Quentin Perret <qperret@...gle.com>, Michael Roth <michael.roth@....com>,
 Wei Wang <wei.w.wang@...el.com>, Liam Merwick <liam.merwick@...cle.com>,
 Isaku Yamahata <isaku.yamahata@...il.com>,
 Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
 Lai Jiangshan <jiangshan.ljs@...group.com>,
 Hou Wenlong <houwenlong.hwl@...group.com>,
 Xiong Zhang <xiong.y.zhang@...ux.intel.com>,
 Jinrong Liang <ljr.kernel@...il.com>, Like Xu <like.xu.linux@...il.com>,
 Mingwei Zhang <mizhang@...gle.com>, Dapeng Mi <dapeng1.mi@...el.com>,
 Manali Shukla <manali.shukla@....com>
Subject: Re: [ANNOUNCE] KVM Microconference at LPC 2024

On 4/3/2024 12:36 AM, Sean Christopherson wrote:
> We are planning on submitting a CFP to host a second annual KVM Microconference
> at Linux Plumbers Conference 2024 (https://lpc.events/event/18).  To help make
> our submission as strong as possible, please respond if you will likely attend,
> and/or have a potential topic that you would like to include in the proposal.
> The tentative submission is below.
> 
> Note!  This is extremely time sensitive, as the deadline for submitting is
> April 4th (yeah, we completely missed the initial announcement).
> 
> Sorry for the super short notice. :-(
> 
> P.S. The Cc list is very ad hoc, please forward at will.
> 
> ===================
> KVM Microconference
> ===================
> 
> KVM (Kernel-based Virtual Machine) enables the use of hardware features to
> improve the efficiency, performance, and security of virtual machines (VMs)
> created and managed by userspace.  KVM was originally developed to accelerate
> VMs running a traditional kernel and operating system, in a world where the
> host kernel and userspace are part of the VM's trusted computing base (TCB).
> 
> KVM has long since expanded to cover a wide (and growing) array of use cases,
> e.g. sandboxing untrusted workloads, deprivileging third party code, reducing
> the TCB of security sensitive workloads, etc.  The expectations placed on KVM
> have also matured accordingly, e.g. functionality that once was "good enough"
> no longer meets the needs and demands of KVM users.
> 
> The KVM Microconference will focus on how to evolve KVM and adjacent subsystems
> in order to satisfy new and upcoming requirements.  Of particular interest is
> extending and enhancing guest_memfd, a guest-first memory API that was heavily
> discussed at the 2023 KVM Microconference, and merged in v6.8.
> 
> Potential Topics:
>    - Removing guest memory from the host kernel's direct map[1]
>    - Mapping guest_memfd into host userspace[2]
>    - Hugepage support for guest_memfd[3]
>    - Eliminating "struct page" for guest_memfd
>    - Passthrough/mediated PMU virtualization[4]
>    - Pagetable-based Virtual Machine (PVM)[5]
>    - Optimizing/hardening KVM usage of GUP[6][7]
>    - Defining KVM requirements for hardware vendors
>    - Utilizing "fault" injection to increase test coverage of edge cases
> 
> [1] https://lore.kernel.org/all/cc1bb8e9bc3e1ab637700a4d3defeec95b55060a.camel@amazon.com
> [2] https://lore.kernel.org/all/20240222161047.402609-1-tabba@google.com
> [3] https://lore.kernel.org/all/CABgObfa=DH7FySBviF63OS9sVog_wt-AqYgtUAGKqnY5Bizivw@mail.gmail.com
> [4] https://lore.kernel.org/all/20240126085444.324918-1-xiong.y.zhang@linux.intel.com
> [5] https://lore.kernel.org/all/20240226143630.33643-1-jiangshanlai@gmail.com
> [6] https://lore.kernel.org/all/CABgObfZCay5-zaZd9mCYGMeS106L055CxsdOWWvRTUk2TPYycg@mail.gmail.com
> [7] https://lore.kernel.org/all/20240320005024.3216282-1-seanjc@google.com

Passthrough PMU lays the foundation for enabling some current and upcoming PMU
virtualization features on AMD processors. Manali and I have been working on them
and would like to participate in the discussion.

- Sandipan