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From: Yinghai Lu <yinghai@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Suresh Siddha <suresh.b.siddha@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Ralf Jung <ralfjung-e@gmx.de>,
	Cyrill Gorcunov <gorcunov@openvz.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs
Date: Thu, 25 Aug 2011 23:18:42 -0700	[thread overview]
Message-ID: <4E573AC2.2070908@kernel.org> (raw)
In-Reply-To: <4E56F9E5.4000005@zytor.com>

On 08/25/2011 06:41 PM, H. Peter Anvin wrote:
> On 08/25/2011 05:17 PM, Bjorn Helgaas wrote:
>>
>> If the OS allocated the next 128 bytes to another device, it sounds
>> like it would cause a conflict on Intel boxes.  This must be an area
>> that differs between vendors.  I haven't seen a spec that mentions 256
>> bytes as the required minimum MMIO size for IOAPICs, and apparently
>> the AMD IOAPIC decodes 240 bytes or fewer.
>>
> 
> For what it's worth, it's probably a bad idea on x86 for the OS to
> allocate addresses in the 0xFExxxxxx range...
> 
for system with more than one ioapic controllers, could have ioapic address rather low.
and those address are allocated to some pci devices BAR by BIOS.

Yinghai

  reply	other threads:[~2011-08-26  6:19 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-25 23:05 [PATCH 1/2] x86, ioapic: Reserve only 128 bytes for IOAPICs Bjorn Helgaas
2011-08-25 23:05 ` [PATCH 2/2] x86, ioapic: Announce resources reserved " Bjorn Helgaas
2011-08-25 23:33 ` [PATCH 1/2] x86, ioapic: Reserve only 128 bytes " Suresh Siddha
2011-08-26  0:17   ` Bjorn Helgaas
2011-08-26  1:41     ` H. Peter Anvin
2011-08-26  6:18       ` Yinghai Lu [this message]
2011-08-26  6:48       ` Cyrill Gorcunov
2011-08-26  9:22         ` Ralf Jung
2011-08-26  9:39           ` Cyrill Gorcunov
2011-08-26  9:53             ` Ralf Jung
2011-08-26  9:56               ` Cyrill Gorcunov
2011-08-26  6:22     ` Cyrill Gorcunov
2011-08-26 16:21       ` Bjorn Helgaas
2011-08-26 16:24         ` H. Peter Anvin
2011-08-26 18:09         ` Cyrill Gorcunov
2011-08-26 18:21           ` H. Peter Anvin
2011-08-26 19:15             ` Cyrill Gorcunov
     [not found] ` <CAErSpo5kEw=VTVv-=_D3hQg5oRNL9yEyJUnpP0biH=t3WRXMZw@mail.gmail.com>
2011-08-26 21:09   ` Fwd: " Ralf Jung

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