linux-kernel - Re: [PATCH v2 07/10] PPC, KVM, CMA: use general CMA reserved area management framework

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Message-ID: <20140616053408.GH23210@js1304-P5Q-DELUXE>
Date:	Mon, 16 Jun 2014 14:34:08 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 07/10] PPC, KVM, CMA: use general CMA reserved area
 management framework

On Sat, Jun 14, 2014 at 02:23:59PM +0530, Aneesh Kumar K.V wrote:
> Joonsoo Kim <iamjoonsoo.kim@....com> writes:
> 
> > Now, we have general CMA reserved area management framework,
> > so use it for future maintainabilty. There is no functional change.
> >
> > Acked-by: Michal Nazarewicz <mina86@...a86.com>
> > Acked-by: Paolo Bonzini <pbonzini@...hat.com>
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> Need this. We may want to keep the VM_BUG_ON by moving
> KVM_CMA_CHUNK_ORDER around.
> 
> diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> index 8056107..1932e0e 100644
> --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
> +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
> @@ -37,8 +37,6 @@
>  #include <asm/ppc-opcode.h>
>  #include <asm/cputable.h>
>  
> -#include "book3s_hv_cma.h"
> -
>  /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
>  #define MAX_LPID_970   63
>  
> @@ -64,7 +62,6 @@ long kvmppc_alloc_hpt(struct kvm *kvm, u32 *htab_orderp)
>         }
>  
>         kvm->arch.hpt_cma_alloc = 0;
> -       VM_BUG_ON(order < KVM_CMA_CHUNK_ORDER);
>         page = kvm_alloc_hpt(1 << (order - PAGE_SHIFT));
>         if (page) {
>                 hpt = (unsigned long)pfn_to_kaddr(page_to_pfn(page));
> 
> 
> 
> -aneesh

Okay.
So do you also want this?

@@ -131,16 +135,18 @@ struct page *kvm_alloc_hpt(unsigned long nr_pages)
 {
        unsigned long align_pages = HPT_ALIGN_PAGES;
 
+       VM_BUG_ON(get_order(nr_pages) < KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
+
        /* Old CPUs require HPT aligned on a multiple of its size */
        if (!cpu_has_feature(CPU_FTR_ARCH_206))
                align_pages = nr_pages;
-       return kvm_alloc_cma(nr_pages, align_pages);
+       return cma_alloc(kvm_cma, nr_pages, get_order(align_pages));
 }

Thanks.
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