linux-kernel - Re: [PATCH 4/6] KVM: arm64: Make __io_map

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Date:   Wed, 8 Dec 2021 17:45:53 +0000
From:   Will Deacon <will@...nel.org>
To:     Quentin Perret <qperret@...gle.com>
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH 4/6] KVM: arm64: Make __io_map_base static

On Wed, Dec 08, 2021 at 03:22:57PM +0000, Quentin Perret wrote:
> The __io_map_base variable is used at EL2 to track the end of the
> hypervisor's "private" VA range in nVHE protected mode. However it
> doesn't need to be used outside of mm.c, so let's make it static to keep
> all the hyp VA allocation logic in one place.
> 
> Signed-off-by: Quentin Perret <qperret@...gle.com>
> ---
>  arch/arm64/kvm/hyp/include/nvhe/mm.h | 1 -
>  arch/arm64/kvm/hyp/nvhe/mm.c         | 3 ++-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> index 3f60d6cc5368..2d08510c6cc1 100644
> --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h
> +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> @@ -12,7 +12,6 @@
>  
>  extern struct kvm_pgtable pkvm_pgtable;
>  extern hyp_spinlock_t pkvm_pgd_lock;
> -extern u64 __io_map_base;
>  
>  int hyp_create_idmap(u32 hyp_va_bits);
>  int hyp_map_vectors(void);
> diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
> index 9e0ff5a700dd..526a7d6fa86f 100644
> --- a/arch/arm64/kvm/hyp/nvhe/mm.c
> +++ b/arch/arm64/kvm/hyp/nvhe/mm.c
> @@ -19,11 +19,12 @@
>  
>  struct kvm_pgtable pkvm_pgtable;
>  hyp_spinlock_t pkvm_pgd_lock;
> -u64 __io_map_base;
>  
>  struct memblock_region hyp_memory[HYP_MEMBLOCK_REGIONS];
>  unsigned int hyp_memblock_nr;
>  
> +static u64 __io_map_base;
> +
>  static int __pkvm_create_mappings(unsigned long start, unsigned long size,
>  				  unsigned long phys, enum kvm_pgtable_prot prot)

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

Will