From: David Gibson <david@gibson.dropbear.id.au>
To: Alexander Graf <agraf@suse.de>
Cc: paulus@samba.org, qemu-devel@nongnu.org, anton@samba.org
Subject: [Qemu-devel] Re: [PATCH 25/26] Add a PAPR TCE-bypass mechanism for the pSeries machine
Date: Thu, 17 Mar 2011 13:21:44 +1100 [thread overview]
Message-ID: <20110317022144.GI1105@yookeroo> (raw)
In-Reply-To: <4D80E8CB.60107@suse.de>
On Wed, Mar 16, 2011 at 05:43:55PM +0100, Alexander Graf wrote:
> On 03/16/2011 05:57 AM, David Gibson wrote:
> >From: Ben Herrenschmidt<benh@kernel.crashing.org>
> >
> >Usually, PAPR virtual IO devices use a virtual IOMMU mechanism, TCEs,
> >to mediate all DMA transfers. While this is necessary for some sorts of
> >operation, it can be complex to program and slow for others.
> >
> >This patch implements a mechanism for bypassing TCE translation, treating
> >"IO" addresses as plain (guest) physical memory addresses. This has two
> >main uses:
> > * Simple, but 64-bit aware programs like firmwares can use the VIO devices
> >without the complexity of TCE setup.
> > * The guest OS can optionally use the TCE bypass to improve performance in
> >suitable situations.
> >
> >The mechanism used is a per-device flag which disables TCE translation.
> >The flag is toggled with some (hypervisor-implemented) RTAS methods.
>
> Is this an official extension used by anyone or is it your own
> invention that's not implemented in pHyp?
The latter.
--
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
next prev parent reply other threads:[~2011-03-17 2:32 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-16 4:56 [Qemu-devel] Implement emulation of pSeries logical partitions (v3) David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 01/26] Clean up PowerPC SLB handling code David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 02/26] Allow qemu_devtree_setprop() to take arbitrary values David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 03/26] Add a hook to allow hypercalls to be emulated on PowerPC David Gibson
2011-03-16 13:46 ` [Qemu-devel] " Alexander Graf
2011-03-16 16:58 ` Stefan Hajnoczi
2011-03-17 2:26 ` David Gibson
2011-03-16 20:44 ` [Qemu-devel] " Anthony Liguori
2011-03-17 4:55 ` David Gibson
2011-03-17 13:20 ` Anthony Liguori
2011-03-18 4:03 ` David Gibson
2011-03-18 6:57 ` Alexander Graf
2011-03-16 4:56 ` [Qemu-devel] [PATCH 04/26] Implement PowerPC slbmfee and slbmfev instructions David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 05/26] Implement missing parts of the logic for the POWER PURR David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 06/26] Correct ppc popcntb logic, implement popcntw and popcntd David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 07/26] Clean up slb_lookup() function David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 08/26] Parse SDR1 on mtspr instead of at translate time David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 09/26] Use "hash" more consistently in ppc mmu code David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 10/26] Better factor the ppc hash translation path David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 11/26] Support 1T segments on ppc David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 12/26] Add POWER7 support for ppc David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 13/26] Start implementing pSeries logical partition machine David Gibson
2011-03-16 14:30 ` [Qemu-devel] " Alexander Graf
2011-03-16 21:59 ` [Qemu-devel] " Anthony Liguori
2011-03-16 23:46 ` Alexander Graf
2011-03-17 3:08 ` David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 14/26] Implement the bus structure for PAPR virtual IO David Gibson
2011-03-16 14:43 ` [Qemu-devel] " Alexander Graf
2011-03-16 22:04 ` [Qemu-devel] " Anthony Liguori
2011-03-17 3:19 ` David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 15/26] Virtual hash page table handling on pSeries machine David Gibson
2011-03-16 15:03 ` [Qemu-devel] " Alexander Graf
2011-03-17 1:03 ` [Qemu-devel] Re: [PATCH 15/26] Virtual hash page table handling on pSeries machine' David Gibson
2011-03-17 7:35 ` Alexander Graf
2011-03-16 4:56 ` [Qemu-devel] [PATCH 16/26] Implement hcall based RTAS for pSeries machines David Gibson
2011-03-16 15:08 ` [Qemu-devel] " Alexander Graf
2011-03-17 1:22 ` David Gibson
2011-03-17 7:36 ` Alexander Graf
2011-03-16 22:08 ` [Qemu-devel] " Anthony Liguori
2011-03-16 4:56 ` [Qemu-devel] [PATCH 17/26] Implement assorted pSeries hcalls and RTAS methods David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 18/26] Implement the PAPR (pSeries) virtualized interrupt controller (xics) David Gibson
2011-03-16 15:47 ` [Qemu-devel] " Alexander Graf
2011-03-17 1:29 ` David Gibson
2011-03-17 7:37 ` Alexander Graf
2011-03-16 22:16 ` [Qemu-devel] " Anthony Liguori
2011-03-17 1:34 ` David Gibson
2011-03-17 13:13 ` Anthony Liguori
2011-03-23 3:48 ` David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 19/26] Add PAPR H_VIO_SIGNAL hypercall and infrastructure for VIO interrupts David Gibson
2011-03-16 15:49 ` [Qemu-devel] " Alexander Graf
2011-03-17 1:38 ` David Gibson
2011-03-17 7:38 ` Alexander Graf
2011-03-16 4:56 ` [Qemu-devel] [PATCH 20/26] Add (virtual) interrupt to PAPR virtual tty device David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 21/26] Implement TCE translation for sPAPR VIO David Gibson
2011-03-16 16:03 ` [Qemu-devel] " Alexander Graf
2011-03-16 20:05 ` Benjamin Herrenschmidt
2011-03-16 20:21 ` Anthony Liguori
2011-03-16 20:22 ` Anthony Liguori
2011-03-16 20:36 ` Benjamin Herrenschmidt
2011-03-17 1:43 ` David Gibson
2011-03-16 22:20 ` [Qemu-devel] " Anthony Liguori
2011-03-18 1:58 ` David Gibson
2011-03-16 4:56 ` [Qemu-devel] [PATCH 22/26] Implement sPAPR Virtual LAN (ibmveth) David Gibson
2011-03-16 16:12 ` [Qemu-devel] " Alexander Graf
2011-03-17 2:04 ` David Gibson
2011-03-16 22:29 ` [Qemu-devel] " Anthony Liguori
2011-03-17 2:09 ` David Gibson
2011-03-16 4:57 ` [Qemu-devel] [PATCH 23/26] Implement PAPR CRQ hypercalls David Gibson
2011-03-16 16:15 ` [Qemu-devel] " Alexander Graf
2011-03-16 4:57 ` [Qemu-devel] [PATCH 24/26] Implement PAPR virtual SCSI interface (ibmvscsi) David Gibson
2011-03-16 16:41 ` [Qemu-devel] " Alexander Graf
2011-03-16 16:51 ` Anthony Liguori
2011-03-16 20:08 ` Benjamin Herrenschmidt
2011-03-16 20:19 ` Anthony Liguori
2011-03-16 4:57 ` [Qemu-devel] [PATCH 25/26] Add a PAPR TCE-bypass mechanism for the pSeries machine David Gibson
2011-03-16 16:43 ` [Qemu-devel] " Alexander Graf
2011-03-17 2:21 ` David Gibson [this message]
2011-03-17 3:25 ` Benjamin Herrenschmidt
2011-03-17 7:44 ` Alexander Graf
2011-03-17 8:44 ` Benjamin Herrenschmidt
2011-03-17 9:37 ` Alexander Graf
2011-03-16 4:57 ` [Qemu-devel] [PATCH 26/26] Implement PAPR VPA functions for pSeries shared processor partitions David Gibson
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