linux-hardening - Re: [RFC PATCH v3 0/5] Hypervisor-Enforced Kernel Integrity

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Message-ID: <ZjTre6BYRpkI_H4o@google.com>
Date: Fri, 3 May 2024 06:49:47 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: "Mickaël Salaün" <mic@...ikod.net>
Cc: Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>, Kees Cook <keescook@...omium.org>, 
	Paolo Bonzini <pbonzini@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Vitaly Kuznetsov <vkuznets@...hat.com>, Wanpeng Li <wanpengli@...cent.com>, 
	Rick P Edgecombe <rick.p.edgecombe@...el.com>, Alexander Graf <graf@...zon.com>, 
	Angelina Vu <angelinavu@...ux.microsoft.com>, 
	Anna Trikalinou <atrikalinou@...rosoft.com>, Chao Peng <chao.p.peng@...ux.intel.com>, 
	Forrest Yuan Yu <yuanyu@...gle.com>, James Gowans <jgowans@...zon.com>, 
	James Morris <jamorris@...ux.microsoft.com>, John Andersen <john.s.andersen@...el.com>, 
	"Madhavan T . Venkataraman" <madvenka@...ux.microsoft.com>, Marian Rotariu <marian.c.rotariu@...il.com>, 
	"Mihai Donțu" <mdontu@...defender.com>, 
	"Nicușor Cîțu" <nicu.citu@...oud.com>, Thara Gopinath <tgopinath@...rosoft.com>, 
	Trilok Soni <quic_tsoni@...cinc.com>, Wei Liu <wei.liu@...nel.org>, 
	Will Deacon <will@...nel.org>, Yu Zhang <yu.c.zhang@...ux.intel.com>, 
	"Ștefan Șicleru" <ssicleru@...defender.com>, dev@...ts.cloudhypervisor.org, 
	kvm@...r.kernel.org, linux-hardening@...r.kernel.org, 
	linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-security-module@...r.kernel.org, qemu-devel@...gnu.org, 
	virtualization@...ts.linux-foundation.org, x86@...nel.org, 
	xen-devel@...ts.xenproject.org
Subject: Re: [RFC PATCH v3 0/5] Hypervisor-Enforced Kernel Integrity - CR pinning

On Fri, May 03, 2024, Mickaël Salaün wrote:
> Hi,
> 
> This patch series implements control-register (CR) pinning for KVM and
> provides an hypervisor-agnostic API to protect guests.  It includes the
> guest interface, the host interface, and the KVM implementation.
> 
> It's not ready for mainline yet (see the current limitations), but we
> think the overall design and interfaces are good and we'd like to have
> some feedback on that.

...

> # Current limitations
> 
> This patch series doesn't handle VM reboot, kexec, nor hybernate yet.
> We'd like to leverage the realated feature from KVM CR-pinning patch
> series [3].  Help appreciated!

Until you have a story for those scenarios, I don't expect you'll get a lot of
valuable feedback, or much feedback at all.  They were the hot topic for KVM CR
pinning, and they'll likely be the hot topic now.