From: Ashok Raj <ashok.raj@intel.com>
To: Andi Kleen <ak@suse.de>
Cc: Ashok Raj <ashok.raj@intel.com>,
linux-kernel@vger.kernel.org, akpm@osdl.org, gregkh@suse.de,
muli@il.ibm.com, asit.k.mallick@intel.com,
suresh.b.siddha@intel.com, anil.s.keshavamurthy@intel.com,
arjan@linux.intel.com, shaohua.li@intel.com
Subject: Re: [Intel IOMMU][patch 1/8] ACPI support for Intel Virtualization Technology for Directed I/O
Date: Tue, 24 Apr 2007 13:17:03 -0700 [thread overview]
Message-ID: <20070424201703.GA27911@linux-os.sc.intel.com> (raw)
In-Reply-To: <200704242050.49253.ak@suse.de>
On Tue, Apr 24, 2007 at 08:50:48PM +0200, Andi Kleen wrote:
>
> > +
> > +LIST_HEAD(dmar_drhd_units);
> > +LIST_HEAD(dmar_rmrr_units);
>
> Comment describing what lock protects those lists?
> In fact there seems to be no locking. What about hotplug?
>
There is no support to handle an IOMMU hotplug at this time. IOMMU hotplug
requires additional support via ACPI that needs to be extended to handle this.
These definitions are scanned at boot time from BIOS tables. They are
pretty much static data that we process during boot. Hence no locking is
required. We pretty much tread this as read only, and the information never
gets changed after initial parsing.
next prev parent reply other threads:[~2007-04-24 20:18 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-24 6:02 [Intel IOMMU][patch 0/8] Intel IOMMU Support Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 1/8] ACPI support for Intel Virtualization Technology for Directed I/O Ashok Raj
2007-04-24 18:50 ` Andi Kleen
2007-04-24 20:17 ` Ashok Raj [this message]
2007-04-24 6:03 ` [Intel IOMMU][patch 2/8] Some generic search functions required to lookup device relationships Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 3/8] Generic hardware support for Intel IOMMU Ashok Raj
2007-04-24 19:27 ` Andi Kleen
2007-04-24 20:59 ` Ashok Raj
2007-04-25 1:17 ` Shaohua Li
2007-04-25 6:53 ` Andi Kleen
2007-04-24 6:03 ` [Intel IOMMU][patch 4/8] Supporting Zero Length Reads in " Ashok Raj
2007-04-24 19:28 ` Andi Kleen
2007-04-24 20:42 ` Ashok Raj
2007-04-24 21:00 ` David Miller
2007-04-24 6:03 ` [Intel IOMMU][patch 5/8] Graphics driver workarounds to provide unity map Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 6/8] Doc updates for Intel Virtualization Technology for Directed I/O Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 7/8] Support for legacy ISA devices Ashok Raj
2007-04-24 19:31 ` Andi Kleen
2007-04-24 20:33 ` Arjan van de Ven
2007-04-24 20:39 ` Ashok Raj
2007-04-24 6:03 ` [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range Ashok Raj
2007-04-24 19:33 ` Andi Kleen
2007-04-24 20:33 ` Ashok Raj
2007-04-24 21:12 ` Andi Kleen
2007-04-24 21:23 ` David Miller
2007-04-24 21:32 ` Roland Dreier
2007-04-24 21:47 ` David Miller
2007-04-24 21:38 ` Ashok Raj
2007-04-24 21:50 ` David Miller
2007-04-24 22:03 ` Andi Kleen
2007-04-24 22:26 ` Ashok Raj
2007-04-25 1:12 ` H. Peter Anvin
2007-04-25 6:55 ` Andi Kleen
2007-04-24 23:22 ` Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2007-04-23 16:38 [Intel IOMMU][patch 0/8] Intel IOMMU Support Ashok Raj
2007-04-23 16:38 ` [Intel IOMMU][patch 1/8] ACPI support for Intel Virtualization Technology for Directed I/O Ashok Raj
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