From: David Gibson <david@gibson.dropbear.id.au>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Alex Williamson <alex.williamson@redhat.com>,
qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
Alexander Graf <agraf@suse.de>
Subject: Re: [Qemu-devel] [RFC PATCH v3 03/18] spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows
Date: Fri, 5 Sep 2014 22:40:21 +1000 [thread overview]
Message-ID: <20140905124021.GD29795@voom.redhat.com> (raw)
In-Reply-To: <1409307142-2600-4-git-send-email-aik@ozlabs.ru>
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On Fri, Aug 29, 2014 at 08:12:07PM +1000, Alexey Kardashevskiy wrote:
> The existing KVM_CREATE_SPAPR_TCE ioctl only support 4G windows max as
> the window size parameter to the kernel ioctl() is 32-bit so
> there's no way of expressing a TCE window > 4GB.
>
> We are going to add huge DMA windows support so this will create small
> window and unexpectedly fail later.
>
> This disables KVM_CREATE_SPAPR_TCE for windows bigger that 4GB. Since
> those windows are normally mapped at the boot time, there will be no
> performance impact.
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2014-09-05 13:05 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-29 10:12 [Qemu-devel] [RFC PATCH v3 00/18] spapr: vfio: Enable Dynamic DMA windows (DDW) Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 01/18] spapr: Make machine naming conventions closer to those for PC Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 02/18] qom: Make object_child_foreach safe for objects removal Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 03/18] spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows Alexey Kardashevskiy
2014-09-05 12:40 ` David Gibson [this message]
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 04/18] spapr_pci: Introduce a liobn number generating macros Alexey Kardashevskiy
2014-09-05 12:41 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 05/18] spapr_vio: " Alexey Kardashevskiy
2014-09-05 12:42 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 06/18] spapr_pci: Make find_phb()/find_dev() public Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 07/18] spapr_iommu: Make spapr_tce_find_by_liobn() public Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 08/18] spapr_iommu: Implement free_table() helper Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 09/18] spapr_rtas: Reserve DDW RTAS token numbers Alexey Kardashevskiy
2014-09-06 9:29 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 10/18] spapr_pci: Define DDW callbacks Alexey Kardashevskiy
2014-09-06 9:30 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 11/18] spapr_pci: Add windows counter Alexey Kardashevskiy
2014-09-06 9:31 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 12/18] spapr_rtas: Add Dynamic DMA windows (DDW) RTAS calls support Alexey Kardashevskiy
2014-09-26 5:26 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 13/18] spapr_pci: Enable DDW Alexey Kardashevskiy
2014-09-10 13:01 ` Alexander Graf
2014-09-10 14:58 ` Alexey Kardashevskiy
2014-09-10 21:16 ` Alexander Graf
2014-09-11 2:53 ` Alexey Kardashevskiy
2014-09-26 5:39 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 14/18] spapr_pci_vfio: Call spapr_pci::reset on reset Alexey Kardashevskiy
2014-09-26 5:40 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 15/18] linux headers update for SPAPR (DDW + EEH) Alexey Kardashevskiy
2014-09-26 5:40 ` David Gibson
2014-09-26 6:55 ` Alexey Kardashevskiy
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 16/18] spapr_pci_vfio: Enable DDW Alexey Kardashevskiy
2014-09-10 13:03 ` Alexander Graf
2014-09-10 15:00 ` Alexey Kardashevskiy
2014-09-10 21:17 ` Alexander Graf
2014-09-11 2:55 ` Alexey Kardashevskiy
2014-09-11 8:34 ` Alexander Graf
2014-09-26 5:47 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 17/18] vfio: Enable DDW ioctls to VFIO IOMMU driver Alexey Kardashevskiy
2014-09-26 5:47 ` David Gibson
2014-08-29 10:12 ` [Qemu-devel] [RFC PATCH v3 18/18] spapr: Add pseries-2.2 machine Alexey Kardashevskiy
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