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Re: [Qemu-devel] [PATCH v4 0/4] enable iommu with -device

From: Marcel Apfelbaum
Subject: Re: [Qemu-devel] [PATCH v4 0/4] enable iommu with -device
Date: Fri, 24 Jun 2016 10:02:01 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0

On 06/24/2016 08:47 AM, Michael S. Tsirkin wrote:
On Tue, Jun 14, 2016 at 10:19:32AM +0300, Marcel Apfelbaum wrote:
Create the iommu device with '-device intel-iommu' instead of 

The device is part of the machine properties because we wanted
to ensure is created before any other PCI device.

The alternative is to skip the bus_master_enable_region at
the time the device is created. We can create this region
at machine_done phase. (patch 1)

Then we need to enable sysbus devices(*) for PC machines (patch 2),
since intel-iommu is a sysbus device.

Patch 3 moves the IOMMU init proces into iommu's realize function
and allows the device creation in both ways.

This breaks make check on x86:

GTESTER check-qtest-ppc64
Broken pipe
GTester: last random seed: R02Sf26cb511ed533726cf1afef21a00bde4
/scm/qemu/tests/Makefile.include:668: recipe for target
'check-qtest-ppc64' failed
make: *** [check-qtest-ppc64] Error 1

I am sorry for that.
I'll take care of it and re-post.


Finally patch 4 removes the iommu machine property.

v3 -> v4:
   - Rebased on mst/pci tree (Michael).

v2 -> v3:
   - Add machine_done notifier in pci_bus realize and remove it unrealize 
   - Add comments for 'cannot_instantiate_with_device_add_yet' (Markus).
   - Split adding the -device iommu support and removing the iommu machine 
property (Michael).
   - Use pci_setup_iommu as before (Peter)
   - Mark intel-iommu as not hot-pluggable (Peter)
   - Rebased on master

v1 -> v2:
   - Enable bus_master also on init if the guest OS already booted to enable 
hotplug (Paolo).
   - Add a machine_done notifier to PCIBus instead of adding functionality
     for q35 machine_done callback. The main reason is we don't want to 
     the code for all platforms that support PCI and is also cleaner this way.
   - Added 'cannot_instantiate_with_device_add_yet' to sysbus devices that lead
     to crashes if added with -device.
   - Rebased on master

(*) Creates a new problem since we have now a bunch of
     new devices that can be created with -device on Q35:
        name "q35-pcihost", bus System
        name "sysbus-ohci", bus System, desc "OHCI USB Controller"
        name "allwinner-ahci", bus System
        name "cfi.pflash01", bus System
        name "esp", bus System
        name "SUNW,fdtwo", bus System
        name "sysbus-ahci", bus System
        name "sysbus-fdc", bus System
        name "vfio-amd-xgbe", bus System, desc "VFIO AMD XGBE"
        name "vfio-calxeda-xgmac", bus System, desc "VFIO Calxeda XGMAC"
        name "virtio-mmio", bus System
        name "fw_cfg", bus System
        name "fw_cfg_io", bus System
        name "fw_cfg_mem", bus System
        name "generic-sdhci", bus System
        name "hpet", bus System
        name "i440FX-pcihost", bus System
        name "intel-iommu", bus System
        name "ioapic", bus System
        name "isabus-bridge", bus System
        name "kvm-ioapic", bus System
        name "kvmclock", bus System
        name "kvmvapic", bus System
        name "pxb-host", bus System

Took care of the ones creating immediate issues (like crashes) by marking them
as 'cannot_instantiate_with_device_add_yet'. I didn't mark them all because:
   - libvirt will mask them anyway
   - some of them have already a "protection" in place
   - it is possible that some of them can be actually used with -device on 
other platform.
   - those are not 'interesting' scenarios.
If somebody spots devices in the list that cannot be added with -device on any 
please let me know and I'll mark them.


Marcel Apfelbaum (4):
   hw/pci: delay bus_master_enable_region initialization
   q35: allow dynamic sysbus
   hw/iommu: enable iommu with -device
   machine: remove iommu property

  hw/core/machine.c                   | 20 ------------------
  hw/i386/intel_iommu.c               | 16 +++++++++++++++
  hw/i386/pc_q35.c                    |  2 +-
  hw/pci-bridge/pci_expander_bridge.c |  2 ++
  hw/pci-host/piix.c                  |  2 ++
  hw/pci-host/q35.c                   | 31 +++-------------------------
  hw/pci/pci.c                        | 41 +++++++++++++++++++++++++++++--------
  include/hw/pci-host/q35.h           |  1 -
  include/hw/pci/pci_bus.h            |  2 ++
  include/sysemu/sysemu.h             |  1 +
  qemu-options.hx                     |  3 ---
  vl.c                                |  5 +++++
  12 files changed, 64 insertions(+), 62 deletions(-)


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