Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver

From	Ingo Molnar <mingo@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver
Date	2015-10-05 18:50 +0200
Message-ID	<qgh7z-4y9-9@gated-at.bofh.it> (permalink)
References	<qeQ9r-39m-1@gated-at.bofh.it> <qfrC2-6uC-11@gated-at.bofh.it> <qgf5M-1ED-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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* Keith Busch <keith.busch@intel.com> wrote:

> On Sat, 3 Oct 2015, Ingo Molnar wrote:
> >* Keith Busch <keith.busch@intel.com> wrote:
> >>+config VMDDEV
> >>+	depends on PCI && PCI_DOMAINS && PCI_MSI && GENERIC_MSI_IRQ_DOMAIN && IRQ_DOMAIN_HIERARCHY
> >>+	tristate "Volume Management Device Driver"
> >>+	default N
> >>+	select HAVE_VMDDEV
> >>+	---help---
> >>+	Adds support for the Intel Volume Manage Device (VMD). VMD is
> >>+	a secondary PCI host bridge that allows PCI Express root ports,
> >>+	and devices attached to them, to be removed from the default PCI
> >>+	domain and placed within the VMD domain. If your system provides
> >>+	one of these and has devices attached to it, say "Y".
> >
> >So what this text does not explain is why does the user care? What tangible
> >benefits does this feature offer to users?
> 
> Hi Ingo,
> 
> The immediate benefit is that devices on VMD domains do not use resources
> on the default PCI domain, so we have more than the 256 buses available.

Would be nice to incorporate that information in the help text and in the 
changelog.

Thanks,

	Ingo
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Thread

[RFC PATCHv2] x86/pci: Initial commit for new VMD device driver Keith Busch <keith.busch@intel.com> - 2015-10-01 19:50 +0200
  Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver Ingo Molnar <mingo@kernel.org> - 2015-10-03 11:50 +0200
    Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device  driver Keith Busch <keith.busch@intel.com> - 2015-10-05 16:40 +0200
      Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver Ingo Molnar <mingo@kernel.org> - 2015-10-05 18:50 +0200
        Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device  driver Keith Busch <keith.busch@intel.com> - 2015-10-05 20:10 +0200
  Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver kbuild test robot <lkp@intel.com> - 2015-10-04 02:40 +0200
  Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver Bjorn Helgaas <helgaas@kernel.org> - 2015-10-07 01:20 +0200
    Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device  driver Keith Busch <keith.busch@intel.com> - 2015-10-07 02:30 +0200
      Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device  driver Keith Busch <keith.busch@intel.com> - 2015-10-07 18:10 +0200
        Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver Bjorn Helgaas <helgaas@kernel.org> - 2015-10-08 15:30 +0200
      Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device driver Bjorn Helgaas <helgaas@kernel.org> - 2015-10-08 15:50 +0200
    Re: [RFC PATCHv2] x86/pci: Initial commit for new VMD device  driver Keith Busch <keith.busch@intel.com> - 2015-10-12 23:10 +0200

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