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RE: [Xen-devel] asterisk, ztdummy, and usb (and HZ = 100 under xen ???)

  • To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Sun, 22 May 2005 17:56:01 +1000
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sun, 22 May 2005 07:55:39 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcVenY2zl676Bju3TiSrIdr1iPGdLwABQXTg
  • Thread-topic: [Xen-devel] asterisk, ztdummy, and usb (and HZ = 100 under xen ???)

> Assuming you have restricted the domain to just accessing registers
> IRQs belonging to the device it controls, I think the only way would
> by programming the device to wreak havoc on its behalf (by DMAing
> arbitrary memory).

Is there a way to protect against rogue DMA writes (without knowing the
details of every particular piece of hardware) or is it just the price
to be paid for direct hardware access?


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