linux-kernel - Re: [PATCH v4 00/14] KVM: arm64: Introduce kvm_{un}share

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Message-Id: <163966005889.1498341.15615109686112796585.b4-ty@kernel.org>
Date:   Thu, 16 Dec 2021 13:07:47 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Will Deacon <will@...nel.org>,
        Quentin Perret <qperret@...gle.com>,
        James Morse <james.morse@....com>
Cc:     linux-kernel@...r.kernel.org, qwandor@...gle.com,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 00/14] KVM: arm64: Introduce kvm_{un}share_hyp()

On Wed, 15 Dec 2021 16:12:17 +0000, Quentin Perret wrote:
> This is v4 of the series previously posted here:
> 
>   https://lore.kernel.org/kvmarm/20211201170411.1561936-1-qperret@google.com/
> 
> This series implements an unshare hypercall at EL2 in nVHE protected
> mode, and makes use of it to unmmap guest-specific data-structures from
> EL2 stage-1 during guest tear-down. Crucially, the implementation of the
> share and unshare routines use page refcounts in the host kernel to
> avoid accidentally unmapping data-structures that overlap a common page.
> 
> [...]

Applied to next, thanks!

[01/14] KVM: arm64: Provide {get,put}_page() stubs for early hyp allocator
        commit: 1fac3cfb9cc60d71b66ee5127b2bc5b5f9f79df8
[02/14] KVM: arm64: Refcount hyp stage-1 pgtable pages
        commit: 2ea2ff91e82293909d4879b0b4c6c94b02d52b7e
[03/14] KVM: arm64: Fixup hyp stage-1 refcount
        commit: d6b4bd3f4897f3b60ac9e8c9e2f0300e739b3392
[04/14] KVM: arm64: Hook up ->page_count() for hypervisor stage-1 page-table
        commit: 34ec7cbf1ee0c45e66a0c24311bcd5b83b7109f5
[05/14] KVM: arm64: Implement kvm_pgtable_hyp_unmap() at EL2
        commit: 82bb02445de57bb3072052705f6f5dea9465592e
[06/14] KVM: arm64: Introduce kvm_share_hyp()
        commit: 3f868e142c0bb052a1c15fd3ceca1391604e2e69
[07/14] KVM: arm64: pkvm: Refcount the pages shared with EL2
        commit: a83e2191b7f1894dd0b4b3816ceb9caf4e0cd7e5
[08/14] KVM: arm64: Extend pkvm_page_state enumeration to handle absent pages
        commit: 3d467f7b8c0a179a10aa4e9f17cd2d3c3b7e5403
[09/14] KVM: arm64: Introduce wrappers for host and hyp spin lock accessors
        commit: 61d99e33e757a21b47b8b130e49dcbdfaa5d2b1c
[10/14] KVM: arm64: Implement do_share() helper for sharing memory
        commit: e82edcc75c4e2389a3d7223c4ef1737bd9a07e5d
[11/14] KVM: arm64: Implement __pkvm_host_share_hyp() using do_share()
        commit: 1ee32109fd78720259f7431740897d37ebcd84f6
[12/14] KVM: arm64: Implement do_unshare() helper for unsharing memory
        commit: 376a240f037959c2b9a2486e53bcd8d388cbec17
[13/14] KVM: arm64: Expose unshare hypercall to the host
        commit: b8cc6eb5bded7078f796b2ebf548f79850281eb6
[14/14] KVM: arm64: pkvm: Unshare guest structs during teardown
        commit: 52b28657ebd7cd20e931ce71190f235d0fa018a6

Cheers,

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