linux-kernel - Re: [PATCH v4 08/15] arm64: kvm: Duplicate hyp/tlb.c for VHE/nVHE

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Date:   Sun, 05 Jul 2020 14:45:25 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     David Brazdil <dbrazdil@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, android-kvm@...gle.com,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 08/15] arm64: kvm: Duplicate hyp/tlb.c for VHE/nVHE

On Thu, 25 Jun 2020 14:14:13 +0100,
David Brazdil <dbrazdil@...gle.com> wrote:
> 
> tlb.c contains code for flushing the TLB, with code shared between VHE/nVHE.
> Because common code is small, duplicate tlb.c and specialize each copy for
> VHE/nVHE.
> 
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>
> ---
>  arch/arm64/kernel/image-vars.h      |  14 +--
>  arch/arm64/kvm/hyp/Makefile         |   2 +-
>  arch/arm64/kvm/hyp/nvhe/Makefile    |   2 +-
>  arch/arm64/kvm/hyp/{ => nvhe}/tlb.c |  94 +---------------
>  arch/arm64/kvm/hyp/vhe/Makefile     |   2 +-
>  arch/arm64/kvm/hyp/vhe/tlb.c        | 162 ++++++++++++++++++++++++++++
>  6 files changed, 178 insertions(+), 98 deletions(-)
>  rename arch/arm64/kvm/hyp/{ => nvhe}/tlb.c (62%)
>  create mode 100644 arch/arm64/kvm/hyp/vhe/tlb.c
> 

[...]

> diff --git a/arch/arm64/kvm/hyp/vhe/tlb.c b/arch/arm64/kvm/hyp/vhe/tlb.c
> new file mode 100644
> index 000000000000..35e8e112ba28
> --- /dev/null
> +++ b/arch/arm64/kvm/hyp/vhe/tlb.c

[...]

> +void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
> +{
> +	struct tlb_inv_context cxt;
> +
> +	dsb(ishst);
> +
> +	/* Switch to requested VMID */
> +	kvm = kern_hyp_va(kvm);

nit: this is now superfluous. I'll drop it locally.

Thanks,

	M.

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