From: "Jan Beulich" <jbeulich@novell.com>
To: Allen M Kay <allen.m.kay@intel.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Weidong Han <weidong.han@intel.com>,
Dexuan Cui <dexuan.cui@intel.com>
Subject: Re: [PATCH 1/2][VTD] pci mmconfig support to be used for ATS
Date: Thu, 20 Nov 2008 08:56:26 +0000 [thread overview]
Message-ID: <4925344A.76E4.0078.0@novell.com> (raw)
In-Reply-To: <57C9024A16AD2D4C97DC78E552063EA35C4BC7A4@orsmsx505.amr.corp.intel.com>
>>> "Kay, Allen M" <allen.m.kay@intel.com> 20.11.08 02:42 >>>
>ATS (Address Translation Service) is a PCI specification used for synchronizing iotlb translations between chipset iommu such as vt-d with iotlb on board a PCI device.
>
>This patch enables PCI mmconfig for Intel64 systems. Most of the code were copied from Linux. This functionality is need for parsing ATS capability in PCIe extended configuration space.
If this is x86-64 only anyway, why do you need to use fixmap space for this (and limit things arbitrarily to 4 segments) rather than using a 256Mb block from one of the unused virtual address regions in hypervisor space?
Also, using obj-$(CONFIG_X86_64) in the Makefile changes would avoid building dead code for x86-32...
Jan
next prev parent reply other threads:[~2008-11-20 8:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-20 1:42 [PATCH 1/2][VTD] pci mmconfig support to be used for ATS Kay, Allen M
2008-11-20 8:56 ` Jan Beulich [this message]
2008-11-20 20:10 ` Kay, Allen M
2008-11-20 20:20 ` Keir Fraser
2008-11-21 10:32 ` [PATCH 1/2][VTD] pci mmconfig support to be usedfor ATS Jan Beulich
2008-11-20 11:54 ` [PATCH 1/2][VTD] pci mmconfig support to be used for ATS Espen Skoglund
2008-11-20 20:04 ` Kay, Allen M
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