linux-kernel - Re: [PATCH v1 06/16] kvm: arm/arm64: Fix stage2_flush

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Message-ID: <20180208110047.GI29286@cbox>
Date:   Thu, 8 Feb 2018 12:00:47 +0100
From:   Christoffer Dall <christoffer.dall@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, marc.zyngier@....com,
        linux-kernel@...r.kernel.org, kristina.martsenko@....com,
        peter.maydell@...aro.org, pbonzini@...hat.com, rkrcmar@...hat.com,
        will.deacon@....com, ard.biesheuvel@...aro.org,
        mark.rutland@....com, catalin.marinas@....com,
        Christoffer Dall <cdall@...aro.org>
Subject: Re: [PATCH v1 06/16] kvm: arm/arm64: Fix stage2_flush_memslot for 4
 level page table

On Tue, Jan 09, 2018 at 07:04:01PM +0000, Suzuki K Poulose wrote:
> So far we have only supported 3 level page table with fixed IPA of 40bits.
> Fix stage2_flush_memslot() to accommodate for 4 level tables.
> 

Acked-by: Christoffer Dall <christoffer.dall@...aro.org>

> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Christoffer Dall <cdall@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  virt/kvm/arm/mmu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
> index 761787befd3b..e6548c85c495 100644
> --- a/virt/kvm/arm/mmu.c
> +++ b/virt/kvm/arm/mmu.c
> @@ -375,7 +375,8 @@ static void stage2_flush_memslot(struct kvm *kvm,
>  	pgd = kvm->arch.pgd + stage2_pgd_index(addr);
>  	do {
>  		next = stage2_pgd_addr_end(addr, end);
> -		stage2_flush_puds(kvm, pgd, addr, next);
> +		if (!stage2_pgd_none(*pgd))
> +			stage2_flush_puds(kvm, pgd, addr, next);
>  	} while (pgd++, addr = next, addr != end);
>  }
>  
> -- 
> 2.13.6
>