linux-kernel - Re: [PATCH 03/11] powerpc/kvm: Gather HPT related variables into sub-structure

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Date:   Fri, 16 Dec 2016 10:24:17 +0100
From:   Thomas Huth <thuth@...hat.com>
To:     David Gibson <david@...son.dropbear.id.au>, paulus@...ba.org
Cc:     michael@...erman.id.au, benh@...nel.crashing.org,
        sjitindarsingh@...il.com, lvivier@...hat.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 03/11] powerpc/kvm: Gather HPT related variables into
 sub-structure

On 15.12.2016 06:53, David Gibson wrote:
> Currently, the powerpc kvm_arch structure contains a number of variables
> tracking the state of the guest's hashed page table (HPT) in KVM HV.  This
> patch gathers them all together into a single kvm_hpt_info substructure.
> This makes life more convenient for the upcoming HPT resizing
> implementation.
> 
> Signed-off-by: David Gibson <david@...son.dropbear.id.au>
> ---
>  arch/powerpc/include/asm/kvm_host.h | 16 ++++---
>  arch/powerpc/kvm/book3s_64_mmu_hv.c | 90 ++++++++++++++++++-------------------
>  arch/powerpc/kvm/book3s_hv.c        |  2 +-
>  arch/powerpc/kvm/book3s_hv_rm_mmu.c | 62 ++++++++++++-------------
>  4 files changed, 87 insertions(+), 83 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index e59b172..2673271 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -241,12 +241,20 @@ struct kvm_arch_memory_slot {
>  #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
>  };
>  
> +struct kvm_hpt_info {
> +	unsigned long virt;
> +	struct revmap_entry *rev;
> +	unsigned long npte;
> +	unsigned long mask;
> +	u32 order;
> +	int cma;
> +};

While you're at it, it would be really great if you could add a comment
at the end of each line with a short description of what the variables
are about. E.g. if I just read "virt" and do not have much clue of the
code yet, I have a hard time to figure out what this means...

 Thomas