Re: [Xen-devel] [PATCH] libxl: suppress device assignment to HVM guest when there is no IOMMU

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, Jul 1, 2013 at 2:08 PM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
> This in effect copies similar logic from xend: While there's no way to
> check whether a device is assigned to a particular guest,
> XEN_DOMCTL_test_assign_device at least allows checking whether an IOMMU
> is there and whether a device has been assign to _some_ guest. For the
> time being, this should be enough to cover for the missing error
> checking/recovery in other parts of libxl's device assignment paths.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Something isn't quite right about this patch:

# xl create h0
Parsing config from h0
xc: info: VIRTUAL MEMORY ARRANGEMENT:
  Loader:        0000000000100000->000000000019ee28
  Modules:       0000000000000000->0000000000000000
  TOTAL:         0000000000000000->00000001ff800000
  ENTRY ADDRESS: 0000000000100608
xc: info: PHYSICAL MEMORY ALLOCATION:
  4KB PAGES: 0x0000000000000200
  2MB PAGES: 0x00000000000007fb
  1GB PAGES: 0x0000000000000004
libxl: error: libxl_pci.c:1046:libxl__device_pci_add: PCI device
0000:07:00.0 cannot be assigned - no IOMMU?
Daemon running with PID 3468
# xl pci-list h0
Vdev Device
00.0 0000:07:00.0
# xl pci-assignable-list
#

In other words, the xenstore stuff is still happening.

 -George

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