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

[Thomas Huth]

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@xxxxxxxxxxxxxxxxxxxxx>
> ---
>  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