From: Cyrill Gorcunov <gorcunov@gmail.com>
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>,
Yinghai Lu <yinghai@kernel.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: Fri, 26 Aug 2011 10:48:38 +0400 [thread overview]
Message-ID: <20110826064838.GB3903@sun> (raw)
In-Reply-To: <4E56F9E5.4000005@zytor.com>
On Thu, Aug 25, 2011 at 06:41:57PM -0700, 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...
>
> -hpa
>
I rather wonder if there a way to assign a different address for the
watchdog Bjorn referring to. I don't have such machine to test but
seems its base address is configurable via pmio. Just curious.
Cyrill
next prev parent reply other threads:[~2011-08-26 6:48 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
2011-08-26 6:48 ` Cyrill Gorcunov [this message]
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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