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

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Date: Thu, 4 Apr 2024 21:10:05 +0800
From: Lai Jiangshan <jiangshanlai@...il.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>
Subject: Re: [ANNOUNCE] KVM Microconference at LPC 2024

On Wed, Apr 3, 2024 at 3:08 AM Sean Christopherson <seanjc@...gle.com> 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]

Wenlong and I would like to share the various use cases of PVM and
discuss its inherent value, underlying technology, and prospects for
the future. We also aim to initiate a discussion on the design of an
effective PV page table management system, with a particular focus on
optimizing it for Nested-TDP as well as PVM scenarios.

Thanks
Lai

>    - 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@gmailcom
> [6] https://lore.kernel.org/all/CABgObfZCay5-zaZd9mCYGMeS106L055CxsdOWWvRTUk2TPYycg@mail.gmail.com
> [7] https://lore.kernel.org/all/20240320005024.3216282-1-seanjc@google.com
>