linux-kernel - Re: [PATCH v4 05/10] kvm: arm64: Remove hyp_adr/ldr_this

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Date:   Tue, 29 Sep 2020 18:34:07 +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, Andrew Scull <ascull@...gle.com>
Subject: Re: [PATCH v4 05/10] kvm: arm64: Remove hyp_adr/ldr_this_cpu

On Tue, Sep 22, 2020 at 09:49:05PM +0100, David Brazdil wrote:
> The hyp_adr/ldr_this_cpu helpers were introduced for use in hyp code
> because they always needed to use TPIDR_EL2 for base, while
> adr/ldr_this_cpu from kernel proper would select between TPIDR_EL2 and
> _EL1 based on VHE/nVHE.
> 
> Simplify this now that the hyp mode case can be handled using the
> __KVM_VHE/NVHE_HYPERVISOR__ macros.
> 
> Acked-by: Andrew Scull <ascull@...gle.com>
> Acked-by: Will Deacon <will@...nel.org>
> Signed-off-by: David Brazdil <dbrazdil@...gle.com>
> ---
>  arch/arm64/include/asm/assembler.h | 29 +++++++++++++++++++----------
>  arch/arm64/include/asm/kvm_asm.h   | 14 +-------------
>  arch/arm64/kvm/hyp/hyp-entry.S     |  2 +-
>  3 files changed, 21 insertions(+), 24 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
> index 54d181177656..86e0ef79a799 100644
> --- a/arch/arm64/include/asm/assembler.h
> +++ b/arch/arm64/include/asm/assembler.h
> @@ -218,6 +218,23 @@ lr	.req	x30		// link register
>  	str	\src, [\tmp, :lo12:\sym]
>  	.endm
>  
> +	/*
> +	 * @dst: destination register (32 or 64 bit wide)

nit: this comment is wrong as I don't think mrs can take a W register
as the destination argument. I'm assuming Marc can fix that up.

Will