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SubjectRe: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus_driver objects

* Gregory Haskins <gregory.haskins@gmail.com> wrote:

> Ingo Molnar wrote:
> > * Gregory Haskins <ghaskins@novell.com> wrote:
> >
> >> This will generally be used for hypervisors to publish any host-side
> >> virtual devices up to a guest. The guest will have the opportunity
> >> to consume any devices present on the vbus-proxy as if they were
> >> platform devices, similar to existing buses like PCI.
> >>
> >> Signed-off-by: Gregory Haskins <ghaskins@novell.com>
> >> ---
> >>
> >> MAINTAINERS | 6 ++
> >> arch/x86/Kconfig | 2 +
> >> drivers/Makefile | 1
> >> drivers/vbus/Kconfig | 14 ++++
> >> drivers/vbus/Makefile | 3 +
> >> drivers/vbus/bus-proxy.c | 152 +++++++++++++++++++++++++++++++++++++++++++
> >> include/linux/vbus_driver.h | 73 +++++++++++++++++++++
> >> 7 files changed, 251 insertions(+), 0 deletions(-)
> >> create mode 100644 drivers/vbus/Kconfig
> >> create mode 100644 drivers/vbus/Makefile
> >> create mode 100644 drivers/vbus/bus-proxy.c
> >> create mode 100644 include/linux/vbus_driver.h
> >
> > Is there a consensus on this with the KVM folks? (i've added the KVM
> > list to the Cc:)
> >
> >
>
> Hi Ingo,
>
> Avi can correct me if I am wrong, but the agreement that he and I
> came to a few months ago was something to the effect of:
>
> kvm will be neutral towards various external IO subsystems, and
> instead provide various hooks (see irqfd, ioeventfd) to permit
> these IO subsystems to interface with kvm.
>
> AlacrityVM is one of the first projects to take advantage of that
> interface. AlacrityVM is kvm-core + vbus-core +
> vbus-kvm-connector + vbus-enhanced qemu + guest drivers. This
> thread is part of the guest-drivers portion. Note that it is
> specific to alacrityvm, not kvm, which is why the kvm list was not
> included in the conversation (also an agreement with Avi:
> http://lkml.org/lkml/2009/8/6/231).

Well my own opinion is that the fracturing of the Linux internal
driver space into diverging pieces of duplicate functionality
(absent compelling technical reasons) is harmful.

Ingo


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