linux-kernel - Re: (subset) [PATCH v12 02/84] KVM: arm64: Disallow copying MTE to guest memory while KVM is dirty logging

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Message-Id: <172433664068.3702537.15170661496841359831.b4-ty@kernel.org>
Date: Thu, 22 Aug 2024 15:24:54 +0100
From: Marc Zyngier <maz@...nel.org>
To: Paolo Bonzini <pbonzini@...hat.com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Bibo Mao <maobibo@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Anup Patel <anup@...infault.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	David Matlack <dmatlack@...gle.com>,
	David Stevens <stevensd@...omium.org>
Subject: Re: (subset) [PATCH v12 02/84] KVM: arm64: Disallow copying MTE to guest memory while KVM is dirty logging

On Fri, 26 Jul 2024 16:51:11 -0700, Sean Christopherson wrote:
> Disallow copying MTE tags to guest memory while KVM is dirty logging, as
> writing guest memory without marking the gfn as dirty in the memslot could
> result in userspace failing to migrate the updated page.  Ideally (maybe?),
> KVM would simply mark the gfn as dirty, but there is no vCPU to work with,
> and presumably the only use case for copy MTE tags _to_ the guest is when
> restoring state on the target.
> 
> [...]

Applied to next, thanks!

[02/84] KVM: arm64: Disallow copying MTE to guest memory while KVM is dirty logging
        commit: e0b7de4fd18c47ebd47ec0dd1af6503d4071b943

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.