linux-kernel - Re: [PATCH v8 05/18] iommu: Only map direct mapped regions

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Date:   Tue, 17 Jan 2017 13:13:18 +0100
From:   Tomasz Nowicki <tnowicki@...iumnetworks.com>
To:     Eric Auger <eric.auger@...hat.com>, <eric.auger.pro@...il.com>,
        <christoffer.dall@...aro.org>, <marc.zyngier@....com>,
        <robin.murphy@....com>, <alex.williamson@...hat.com>,
        <will.deacon@....com>, <joro@...tes.org>, <tglx@...utronix.de>,
        <jason@...edaemon.net>, <linux-arm-kernel@...ts.infradead.org>
CC:     <drjones@...hat.com>, <kvm@...r.kernel.org>,
        <punit.agrawal@....com>, <linux-kernel@...r.kernel.org>,
        <geethasowjanya.akula@...il.com>, <diana.craciun@....com>,
        <iommu@...ts.linux-foundation.org>,
        <pranav.sawargaonkar@...il.com>, <bharat.bhushan@....com>,
        <shankerd@...eaurora.org>, <gpkulkarni@...il.com>
Subject: Re: [PATCH v8 05/18] iommu: Only map direct mapped regions

On 11.01.2017 10:41, Eric Auger wrote:
> As we introduced new reserved region types which do not require
> mapping, let's make sure we only map direct mapped regions.
>
> Signed-off-by: Eric Auger <eric.auger@...hat.com>

Reviewed-by: Tomasz Nowicki <tomasz.nowicki@...iumnetworks.com>

Thanks,
Tomasz

>
> ---
>
> v3 -> v4:
> - use region's type and reword commit message and title
> ---
>  drivers/iommu/iommu.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 927878d..41c1906 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -343,6 +343,9 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group,
>  		start = ALIGN(entry->start, pg_size);
>  		end   = ALIGN(entry->start + entry->length, pg_size);
>
> +		if (entry->type != IOMMU_RESV_DIRECT)
> +			continue;
> +
>  		for (addr = start; addr < end; addr += pg_size) {
>  			phys_addr_t phys_addr;
>
>