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From: Lai Jiangshan <jiangshanlai@gmail.com>
Date: Thu, 4 Apr 2024 21:10:05 +0800
Message-ID: <CAJhGHyCgQkBcHZGxEUVMYimmad7UcuzDHXoyRGyTEngO=ZBDEg@mail.gmail.com>
Subject: Re: [ANNOUNCE] KVM Microconference at LPC 2024
To: Sean Christopherson <seanjc@google.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, 
	David Hildenbrand <david@redhat.com>, David Stevens <stevensd@chromium.org>, 
	Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>, 
	Oliver Upton <oliver.upton@linux.dev>, James Morse <james.morse@arm.com>, 
	Suzuki K Poulose <suzuki.poulose@arm.com>, Zenghui Yu <yuzenghui@huawei.com>, 
	Huacai Chen <chenhuacai@kernel.org>, Tianrui Zhao <zhaotianrui@loongson.cn>, 
	Bibo Mao <maobibo@loongson.cn>, Michael Ellerman <mpe@ellerman.id.au>, 
	Nicholas Piggin <npiggin@gmail.com>, Anup Patel <anup@brainfault.org>, 
	Christian Borntraeger <borntraeger@linux.ibm.com>, Janosch Frank <frankja@linux.ibm.com>, 
	Claudio Imbrenda <imbrenda@linux.ibm.com>, Xiaoyao Li <xiaoyao.li@intel.com>, 
	Xu Yilun <yilun.xu@intel.com>, Chao Peng <chao.p.peng@linux.intel.com>, 
	Fuad Tabba <tabba@google.com>, Jim Mattson <jmattson@google.com>, 
	Jarkko Sakkinen <jarkko@kernel.org>, Maxim Levitsky <mlevitsk@redhat.com>, 
	Anish Moorthy <amoorthy@google.com>, David Matlack <dmatlack@google.com>, 
	Yu Zhang <yu.c.zhang@linux.intel.com>, Isaku Yamahata <isaku.yamahata@intel.com>, 
	Edgecombe@google.com, Rick P <rick.p.edgecombe@intel.com>, 
	=?UTF-8?B?TWlja2HDq2wgU2FsYcO8bg==?= <mic@digikod.net>, 
	Vlastimil Babka <vbabka@suse.cz>, Vishal Annapurve <vannapurve@google.com>, 
	Ackerley Tng <ackerleytng@google.com>, Maciej Szmigiero <mail@maciej.szmigiero.name>, 
	Quentin Perret <qperret@google.com>, Michael Roth <michael.roth@amd.com>, 
	Wei Wang <wei.w.wang@intel.com>, Liam Merwick <liam.merwick@oracle.com>, 
	Isaku Yamahata <isaku.yamahata@gmail.com>, 
	Kirill Shutemov <kirill.shutemov@linux.intel.com>, 
	Lai Jiangshan <jiangshan.ljs@antgroup.com>, Hou Wenlong <houwenlong.hwl@antgroup.com>, 
	Xiong Zhang <xiong.y.zhang@linux.intel.com>, Jinrong Liang <ljr.kernel@gmail.com>, 
	Like Xu <like.xu.linux@gmail.com>, Mingwei Zhang <mizhang@google.com>, 
	Dapeng Mi <dapeng1.mi@intel.com>
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On Wed, Apr 3, 2024 at 3:08=E2=80=AFAM Sean Christopherson <seanjc@google.c=
om> wrote:
>
> We are planning on submitting a CFP to host a second annual KVM Microconf=
erence
> 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 a=
ttend,
> and/or have a potential topic that you would like to include in the propo=
sal.
> The tentative submission is below.
>
> Note!  This is extremely time sensitive, as the deadline for submitting i=
s
> 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.
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> KVM Microconference
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> KVM (Kernel-based Virtual Machine) enables the use of hardware features t=
o
> improve the efficiency, performance, and security of virtual machines (VM=
s)
> created and managed by userspace.  KVM was originally developed to accele=
rate
> VMs running a traditional kernel and operating system, in a world where t=
he
> host kernel and userspace are part of the VM's trusted computing base (TC=
B).
>
> KVM has long since expanded to cover a wide (and growing) array of use ca=
ses,
> e.g. sandboxing untrusted workloads, deprivileging third party code, redu=
cing
> the TCB of security sensitive workloads, etc.  The expectations placed on=
 KVM
> have also matured accordingly, e.g. functionality that once was "good eno=
ugh"
> no longer meets the needs and demands of KVM users.
>
> The KVM Microconference will focus on how to evolve KVM and adjacent subs=
ystems
> in order to satisfy new and upcoming requirements.  Of particular interes=
t is
> extending and enhancing guest_memfd, a guest-first memory API that was he=
avily
> 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=3DDH7FySBviF63OS9sVog_wt-AqYgtUA=
GKqnY5Bizivw@mail.gmail.com
> [4] https://lore.kernel.org/all/20240126085444.324918-1-xiong.y.zhang@lin=
ux.intel.com
> [5] https://lore.kernel.org/all/20240226143630.33643-1-jiangshanlai@gmail=
com
> [6] https://lore.kernel.org/all/CABgObfZCay5-zaZd9mCYGMeS106L055CxsdOWWvR=
TUk2TPYycg@mail.gmail.com
> [7] https://lore.kernel.org/all/20240320005024.3216282-1-seanjc@google.co=
m
>