[PATCH v8] Xen PCI + Xen PCI frontend driver.

From: Konrad Rzeszutek Wilk
Date: Tue Oct 12 2010 - 11:47:28 EST

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This patch set contains the supporting patches and the driver itself for
Xen Paravirtualized (PV) domains to use PCI pass-through devices (the git tree
is git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git devel/xen-pcifront-0.8).
This patch-set is also utilized in Stefano's PV on HVM MSI/MSI-X patchset [1].

Changelog since v7 [http://lwn.net/Articles/408418/] posting:
- Added Reviewed-by/Acked-by on some of the patches.
- Fleshed out comments.
- Ditched the io_apic.c idea and used Thomas Gleixner idea.

The Xen PCI frontend driver can be used by PV guests on IOMMU hardware
(or IOMMU-less). Without the hardware IOMMU you have a potential security
hole wherein a guest domain can use the hardware to map pages outside its
memory range and slurp pages up. As such, this is more restricted to a
Privileged PV domain, aka - device driver domain (similar to Qubes but a
poor-man mechanism [2]).

The first set of patches are specific to the Xen subsystem, where
we introduce an IRQ chip for Physical IRQs, along with the supporting
harness code:
xen: Don't disable the I/O space
xen: define BIOVEC_PHYS_MERGEABLE()
xen: implement pirq type event channels
xen: identity map gsi->irqs
xen: dynamically allocate irq & event structures
xen: set pirq name to something useful.
xen: statically initialize cpu_evtchn_mask_p
xen: Find an unbound irq number in reverse order (high to low).
xen: Provide a variant of xen_poll_irq with timeout.
xen: fix shared irq device passthrough

The next set of patches expose functionality for module drivers to be able to
enumerate and iomap (using the _PAGE_IOMAP flag) PCI devices.

x86/io_apic: add get_nr_irqs_gsi()
x86/PCI: Clean up pci_cache_line_size
x86/PCI: make sure _PAGE_IOMAP it set on pci mappings
x86/PCI: Export pci_walk_bus function.

The next two patches abstract the MSI/MSI-X architecture calls so that the
default native one (used on bare-metal) can be overwritten when running
in virtualized mode (right now on Xen). The implementation is a simple
function pointer structure.

msi: Introduce default_[teardown|setup]_msi_irqs with fallback.
x86: Introduce x86_msi_ops

Next, the Xen PCI stub driver. I've put it in the same location
where other sub-platform PCI drivers are. It hooks up to the
PCI legacy IRQ setup ('pcibios_enable_irq'), and MSI/MSI-X
allocation/de-allocation (via the x86_msi_ops introduced in earlier patches).

xen/x86/PCI: Add support for the Xen PCI subsystem

Lastly, the Xen PCI front-end driver which is responsible for hooking up
to the PCI configuration read/write methods via the 'pci_scan_bus_parented' call.
In essence all pci_conf_read/write in the guest will be tunneled via
pcifront_bus_[read|write] methods. The MSI/MSI-X calls will be handled
by the Xen-PCI front-end driver as well. We also need to add a new
state so updating the XenBus:

xenbus: Xen paravirtualised PCI hotplug support.
xenbus: prevent warnings on unhandled enumeration values
xen-pcifront: Xen PCI frontend driver.

The last three are two bug fixes and updating the MAINTAINERs file
with my name:

xen/pci: Request ACS when Xen-SWIOTLB is activated.
MAINTAINERS: Add myself for Xen PCI and Xen SWIOTLB maintainer.
swiotlb-xen: On x86-32 builts, select SWIOTLB instead of depending on it.

The shortlog and the diffstat:

Alex Nixon (3):
xen: Don't disable the I/O space
x86/PCI: Clean up pci_cache_line_size
xen/x86/PCI: Add support for the Xen PCI subsystem

Gerd Hoffmann (1):
xen: set pirq name to something useful.

Jeremy Fitzhardinge (7):
xen: define BIOVEC_PHYS_MERGEABLE()
xen: implement pirq type event channels
x86/io_apic: add get_nr_irqs_gsi()
xen: identity map gsi->irqs
xen: dynamically allocate irq & event structures
xen: statically initialize cpu_evtchn_mask_p
x86/PCI: make sure _PAGE_IOMAP it set on pci mappings

Konrad Rzeszutek Wilk (7):
xen: Find an unbound irq number in reverse order (high to low).
xen: Provide a variant of xen_poll_irq with timeout.
xen: fix shared irq device passthrough
x86/PCI: Export pci_walk_bus function.
xen/pci: Request ACS when Xen-SWIOTLB is activated.
MAINTAINERS: Add myself for Xen PCI and Xen SWIOTLB maintainer.
swiotlb-xen: On x86-32 builts, select SWIOTLB instead of depending on it.

Noboru Iwamatsu (1):
xenbus: prevent warnings on unhandled enumeration values

Ryan Wilson (1):
xen-pcifront: Xen PCI frontend driver.

Stefano Stabellini (1):
x86: Introduce x86_msi_ops

Thomas Gleixner (1):
msi: Introduce default_[teardown|setup]_msi_irqs with fallback.

Yosuke Iwamatsu (1):
xenbus: Xen paravirtualised PCI hotplug support.

MAINTAINERS | 14 +
arch/x86/Kconfig | 5 +
arch/x86/include/asm/io.h | 13 +
arch/x86/include/asm/io_apic.h | 1 +
arch/x86/include/asm/pci.h | 33 +-
arch/x86/include/asm/pci_x86.h | 1 +
arch/x86/include/asm/x86_init.h | 9 +
arch/x86/include/asm/xen/pci.h | 53 ++
arch/x86/kernel/apic/io_apic.c | 9 +-
arch/x86/kernel/x86_init.c | 7 +
arch/x86/pci/Makefile | 1 +
arch/x86/pci/common.c | 17 +-
arch/x86/pci/i386.c | 2 +
arch/x86/pci/xen.c | 147 +++++
arch/x86/xen/enlighten.c | 3 +
arch/x86/xen/pci-swiotlb-xen.c | 4 +
arch/x86/xen/setup.c | 2 -
drivers/block/xen-blkfront.c | 2 +
drivers/input/xen-kbdfront.c | 2 +
drivers/net/xen-netfront.c | 2 +
drivers/pci/Kconfig | 15 +
drivers/pci/Makefile | 2 +
drivers/pci/bus.c | 1 +
drivers/pci/msi.c | 14 +-
drivers/pci/xen-pcifront.c | 1157 ++++++++++++++++++++++++++++++++++++
drivers/video/xen-fbfront.c | 2 +
drivers/xen/Kconfig | 3 +-
drivers/xen/Makefile | 2 +-
drivers/xen/biomerge.c | 13 +
drivers/xen/events.c | 345 ++++++++++-
drivers/xen/xenbus/xenbus_client.c | 2 +
include/xen/events.h | 18 +
include/xen/interface/io/pciif.h | 112 ++++
include/xen/interface/io/xenbus.h | 8 +-
34 files changed, 1987 insertions(+), 34 deletions(-)

P.S.
[1]. git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.36-rc1-pvhvm-pirq-v3

[2]: http://qubes-os.org/ which utilizes hardware IOMMU to run seperate domains wherein
each has specific access to hardware.

[3] Some of the authors of the patches have moved on, so their e-mails
are bouncing. I am purposly making the 'From' a valid email so that the patches
do show up on LKML. The git tree contains their proper old email addresses.

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Next message: Konrad Rzeszutek Wilk: "[PATCH 17/23] xen/x86/PCI: Add support for the Xen PCI subsystem"
Previous message: Konrad Rzeszutek Wilk: "[PATCH 11/23] xen: fix shared irq device passthrough"
Next in thread: Konrad Rzeszutek Wilk: "[PATCH 13/23] x86/PCI: make sure _PAGE_IOMAP it set on pci mappings"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]