linux-kernel - Re: [PATCH v2 09/17] kvm: arm64: Make stage2 page table layout dynamic

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Date:   Wed, 25 Apr 2018 17:37:45 +0100
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Julien Grall <julien.grall@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     ard.biesheuvel@...aro.org, kvm@...r.kernel.org,
        marc.zyngier@....com, catalin.marinas@....com,
        punit.agrawal@....com, will.deacon@....com,
        linux-kernel@...r.kernel.org, kristina.martsenko@....com,
        pbonzini@...hat.com, kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v2 09/17] kvm: arm64: Make stage2 page table layout
 dynamic

On 25/04/18 17:35, Julien Grall wrote:
> Hi Suzuki,
> 
> On 27/03/18 14:15, Suzuki K Poulose wrote:
>> So far we had a static stage2 page table handling code, based on a
>> fixed IPA of 40bits. As we prepare for a configurable IPA size per
>> VM, make the our stage2 page table code dynamic to do the right thing
>> for a given VM.
>>
>> Support for the IPA size configuration needs other changes in the way
>> we configure the EL2 registers (VTTBR and VTCR). So, the IPA is still
>> fixed to 40bits. The patch also moves the kvm_page_empty() in asm/kvm_mmu.h
>> to the top, before including the asm/stage2_pgtable.h to avoid a forward
>> declaration.
>>
>> Cc: Marc Zyngier <marc.zyngier@....com>
>> Cc: Christoffer Dall <cdall@...nel.org>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>>   arch/arm64/include/asm/kvm_mmu.h              |  16 +-
>>   arch/arm64/include/asm/stage2_pgtable-nopmd.h |  42 ------
>>   arch/arm64/include/asm/stage2_pgtable-nopud.h |  39 -----
>>   arch/arm64/include/asm/stage2_pgtable.h       | 203 +++++++++++++++++---------
>>   4 files changed, 145 insertions(+), 155 deletions(-)
>>   delete mode 100644 arch/arm64/include/asm/stage2_pgtable-nopmd.h
>>   delete mode 100644 arch/arm64/include/asm/stage2_pgtable-nopud.h
>>
>> diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
>> index 594c4e6..bc133ce 100644
>> --- a/arch/arm64/include/asm/kvm_mmu.h
>> +++ b/arch/arm64/include/asm/kvm_mmu.h
>> @@ -18,9 +18,10 @@
>>   #ifndef __ARM64_KVM_MMU_H__
>>   #define __ARM64_KVM_MMU_H__
>> +#include <asm/cpufeature.h>
>>   #include <asm/page.h>
>>   #include <asm/memory.h>
>> -#include <asm/cpufeature.h>
> 
> OOI, why was the include of cpufeature.h moved earlier?

I think it was a minor cleanup to keep the includes in order. I will either
mention it or drop it from the hunk altogether.

Cheers
Suzuki