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From: David Miller <davem@davemloft.net>
To: ebiederm@xmission.com
Cc: benh@kernel.crashing.org, jeff@garzik.org, greg@kroah.com,
	tony.luck@intel.com, grundler@parisc-linux.org, mingo@elte.hu,
	linux-kernel@vger.kernel.org, kyle@parisc-linux.org,
	linuxppc-dev@ozlabs.org, brice@myri.com, shaohua.li@intel.com,
	linux-pci@atrey.karlin.mff.cuni.cz
Subject: Re: [PATCH 0/6] MSI portability cleanups
Date: Sun, 28 Jan 2007 15:37:07 -0800 (PST)	[thread overview]
Message-ID: <20070128.153707.30184351.davem@davemloft.net> (raw)
In-Reply-To: <m1hcuaohqj.fsf@ebiederm.dsl.xmission.com>

From: ebiederm@xmission.com (Eric W. Biederman)
Date: Sun, 28 Jan 2007 16:26:44 -0700

> Yes.  In general the mainline linux kernel does not support certain
> classes of stupidity.  TCP offload engines, firmware drivers for
> hardware we care about, a fixed ABI to binary only modules, etc.
> It is the responsibility of the OS to setup MSI so we do it, not
> the firmware so we do it.

I absolutely disagree with you Eric, and I think you're being
rediculious.

If the hypervisor doesn't control the MSI PCI config space
register writes, this allows the device to spam PCI devices
which belong to other domains.

It's a freakin' reasonable design trade off decision, get over
it! :-)

Yes it can be done at the hardware level, and many hypervisor
based systems do that, but it's not the one-and-only true
way to implment inter-domain protection behind a single
PCI host controller.

  reply	other threads:[~2007-01-28 23:37 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1169714047.65693.647693675533.qpush@cradle>
2007-01-28 19:40 ` Eric W. Biederman
2007-01-28 19:42   ` [PATCH 1/6] msi: Kill msi_lookup_irq Eric W. Biederman
2007-01-28 19:44     ` [PATCH 2/6] msi: Remove msi_lock Eric W. Biederman
2007-01-28 19:45       ` [PATCH 3/6] msi: Fix msi_remove_pci_irq_vectors Eric W. Biederman
2007-01-28 19:47         ` [PATCH 4/6] msi: Remove attach_msi_entry Eric W. Biederman
2007-01-28 19:52           ` [PATCH 5/6] msi: Kill the msi_desc array Eric W. Biederman
2007-01-28 19:56             ` [PATCH 6/6] msi: Make MSI useable more architectures Eric W. Biederman
2007-01-28 22:01     ` [PATCH 1/6] msi: Kill msi_lookup_irq Paul Mackerras
2007-01-28 22:18       ` Eric W. Biederman
2007-01-28 20:23   ` [PATCH 0/6] MSI portability cleanups Benjamin Herrenschmidt
2007-01-28 20:47     ` Jeff Garzik
2007-01-28 21:20       ` Eric W. Biederman
2007-01-28 21:26         ` Ingo Molnar
2007-01-28 22:09         ` Benjamin Herrenschmidt
2007-01-28 23:26           ` Eric W. Biederman
2007-01-28 23:37             ` David Miller [this message]
2007-01-29  5:18               ` Eric W. Biederman
2007-01-29  5:25                 ` David Miller
2007-01-29  5:58                   ` Eric W. Biederman
2007-01-29  6:05                   ` Benjamin Herrenschmidt
2007-01-29  8:28                     ` Eric W. Biederman
2007-01-29  9:03                     ` Eric W. Biederman
2007-01-29 10:11                       ` Michael Ellerman
2007-01-29 20:32                         ` Benjamin Herrenschmidt
2007-01-29 23:29                         ` Paul Mackerras
2007-01-29 23:40                           ` Benjamin Herrenschmidt
2007-01-29 20:22                       ` Benjamin Herrenschmidt
2007-01-29 23:05                         ` Paul Mackerras
2007-01-30 19:32                           ` Segher Boessenkool
2007-01-29  1:33             ` Benjamin Herrenschmidt
2007-02-01  4:29           ` Greg KH
2007-01-28 23:44         ` David Miller
2007-01-28 22:11       ` Eric W. Biederman
2007-01-28 23:42       ` David Miller
2007-01-28 21:34     ` Eric W. Biederman

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