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

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Message-ID: <20240403174003.damh4vq7xh53e6vw@amd.com>
Date: Wed, 3 Apr 2024 12:40:03 -0500
From: Michael Roth <michael.roth@....com>
To: Sean Christopherson <seanjc@...gle.com>
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Subject: Re: [ANNOUNCE] KVM Microconference at LPC 2024

On Tue, Apr 02, 2024 at 12:06:52PM -0700, 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

Another gmem proposal we were considering was:

  - Scalability/Performance Analysis of guest_memfd

Mainly looking at things like points of contention during lazy acceptance for
large guests, page-conversion latency increases, impact of discard/realloc
(prealloc?) of gmem pages from userspace, etc.

Thanks,

Mike

>    - 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