linux-kernel - Re: [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line

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Date:   Mon, 18 Jan 2021 13:14:57 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v4 14/21] arm64: Honor VHE being disabled from the
 command-line

On Mon, Jan 18, 2021 at 09:45:26AM +0000, Marc Zyngier wrote:
> Finally we can check whether VHE is disabled on the command line,
> and not enable it if that's the user's wish.
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>
Acked-by: David Brazdil <dbrazdil@...gle.com>

> ---
>  arch/arm64/kernel/hyp-stub.S | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
> index 59820f9b8522..bbab2148a2a2 100644
> --- a/arch/arm64/kernel/hyp-stub.S
> +++ b/arch/arm64/kernel/hyp-stub.S
> @@ -77,13 +77,24 @@ SYM_CODE_END(el1_sync)
>  SYM_CODE_START_LOCAL(mutate_to_vhe)
>  	// Sanity check: MMU *must* be off
>  	mrs	x0, sctlr_el2
> -	tbnz	x0, #0, 1f
> +	tbnz	x0, #0, 2f
>  
>  	// Needs to be VHE capable, obviously
>  	mrs	x0, id_aa64mmfr1_el1
>  	ubfx	x0, x0, #ID_AA64MMFR1_VHE_SHIFT, #4
> -	cbz	x0, 1f
> +	cbz	x0, 2f
>  
> +	// Check whether VHE is disabled from the command line
> +	adr_l	x1, id_aa64mmfr1_val
> +	ldr	x0, [x1]
> +	adr_l	x1, id_aa64mmfr1_mask
> +	ldr	x1, [x1]
super nit: There's a ldr_l macro

> +	ubfx	x0, x0, #ID_AA64MMFR1_VHE_SHIFT, #4
> +	ubfx	x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4
> +	cbz	x1, 1f
> +	and	x0, x0, x1
> +	cbz	x0, 2f
> +1:
>  	// Engage the VHE magic!
>  	mov_q	x0, HCR_HOST_VHE_FLAGS
>  	msr	hcr_el2, x0
> @@ -152,7 +163,7 @@ skip_spe:
>  	orr	x0, x0, x1
>  	msr	spsr_el1, x0
>  
> -1:	eret
> +2:	eret
>  SYM_CODE_END(mutate_to_vhe)
>  
>  .macro invalid_vector	label
> -- 
> 2.29.2
>