* AMD iommu: Difference between setting iommu=pt and not setting this option
@ 2012-04-02 7:56 Andreas Hartmann
0 siblings, 0 replies; only message in thread
From: Andreas Hartmann @ 2012-04-02 7:56 UTC (permalink / raw)
To: KVM, Kernel-Mailingliste
Hello,
please, could somebody explain the difference in behaviour between
setting the boot option iommu=pt and not setting it?
I can see the following differences:
w/ iommu=pt:
[ 0.832946] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40
[ 0.883983] AMD-Vi: Initialized for Passthrough Mode
w/o iommu=pt:
[ 0.834905] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40
[ 0.894172] AMD-Vi: Lazy IO/TLB flushing enabled
In both cases, I can pass through a PCIe device but not a PCI device (->
no problem with IRQ-sharing - the PCI device has its own exclusive IRQ).
If I use iommu=pt, the passed PCIe device is broken after the VM has
been shutdown and started again.
Thank you,
kind regards,
Andreas
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2012-04-02 7:56 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-04-02 7:56 AMD iommu: Difference between setting iommu=pt and not setting this option Andreas Hartmann
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.