linux-kernel - Re: [PATCH 8/8] KVM: PPC: Add hugepage support for IOMMU in-kernel handling

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Date:	Thu, 27 Jun 2013 13:39:23 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
CC:	<linuxppc-dev@...ts.ozlabs.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alexander Graf <agraf@...e.de>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	<kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kvm-ppc@...r.kernel.org>
Subject: Re: [PATCH 8/8] KVM: PPC: Add hugepage support for IOMMU in-kernel
 handling

On 06/27/2013 12:02:36 AM, Alexey Kardashevskiy wrote:
> +/*
> + * The KVM guest can be backed with 16MB pages.
> + * In this case, we cannot do page counting from the real mode
> + * as the compound pages are used - they are linked in a list
> + * with pointers as virtual addresses which are inaccessible
> + * in real mode.
> + *
> + * The code below keeps a 16MB pages list and uses page struct
> + * in real mode if it is already locked in RAM and inserted into
> + * the list or switches to the virtual mode where it can be
> + * handled in a usual manner.
> + */
> +#define KVMPPC_HUGEPAGE_HASH(gpa)	hash_32(gpa >> 24, 32)
> +
> +struct kvmppc_iommu_hugepage {
> +	struct hlist_node hash_node;
> +	unsigned long gpa;	/* Guest physical address */
> +	unsigned long hpa;	/* Host physical address */
> +	struct page *page;	/* page struct of the very first  
> subpage */
> +	unsigned long size;	/* Huge page size (always 16MB at the  
> moment) */
> +};

Shouldn't this be namespaced to something like "book3s" or "spapr"?

-Scott
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