linux-kernel - Re: [PATCH v4 07/10] kvm: arm64: Duplicate arm64_ssbd_callback

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Date:   Tue, 29 Sep 2020 18:37:28 +0100
From:   Will Deacon <will@...nel.org>
To:     David Brazdil <dbrazdil@...gle.com>
Cc:     kvmarm@...ts.cs.columbia.edu,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 07/10] kvm: arm64: Duplicate
 arm64_ssbd_callback_required for nVHE hyp

On Tue, Sep 22, 2020 at 09:49:07PM +0100, David Brazdil wrote:
> Hyp keeps track of which cores require SSBD callback by accessing a
> kernel-proper global variable. Create an nVHE symbol of the same name
> and copy the value from kernel proper to nVHE as KVM is being enabled
> on a core.
> 
> Done in preparation for separating percpu memory owned by kernel
> proper and nVHE.
> 
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>
> ---
>  arch/arm64/include/asm/kvm_mmu.h | 14 +++++++++++++-
>  arch/arm64/kernel/image-vars.h   |  1 -
>  arch/arm64/kvm/arm.c             |  3 +++
>  arch/arm64/kvm/hyp/nvhe/switch.c |  3 +++
>  4 files changed, 19 insertions(+), 2 deletions(-)

Acked-by: Will Deacon <will@...nel.org>

Marc: please take a look at for-next/ghostbusters on the arm64 tree, as
that has the patches which remove this stuff entirely. I had to rebase
the branch today because I screwed up some of the SoBs but the HEAD is
now stable at 780c083a8f84.

Will