Ingo Molnar wrote:
* Gregory Haskins <ghaskins@xxxxxxxxxx> 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@xxxxxxxxxx>
---
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:)
I'll let Avi comment about it from a KVM perspective but from a QEMU
perspective, I don't think we want to support two paravirtual IO
frameworks. I'd like to see them converge. Since there's an install
base of guests today with virtio drivers, there really ought to be a
compelling reason to change the virtio ABI in a non-backwards compatible
way. This means convergence really ought to be adding features to virtio.
On paper, I don't think vbus really has any features over virtio. vbus
does things in different ways (paravirtual bus vs. pci for discovery)
but I think we're happy with how virtio does things today.
I think the reason vbus gets better performance for networking today is
that vbus' backends are in the kernel while virtio's backends are
currently in userspace. Since Michael has a functioning in-kernel
backend for virtio-net now, I suspect we're weeks (maybe days) away from
performance results. My expectation is that vhost + virtio-net will be
as good as venet + vbus. If that's the case, then I don't see any
reason to adopt vbus unless Greg things there are other compelling
features over virtio.
Regards,
Anthony Liguori
Ingo
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