Re: decent performance drop for SCSI LLD / SAN initiator when iommu is turned on

2013-05-07 Thread Michael S. Tsirkin
On Mon, May 06, 2013 at 03:35:58PM -0700, Alexander Duyck wrote: On 05/06/2013 02:39 PM, Or Gerlitz wrote: On Thu, May 2, 2013 at 4:56 AM, Michael S. Tsirkin m...@redhat.com wrote: On Thu, May 02, 2013 at 02:11:15AM +0300, Or Gerlitz wrote: So we've noted that when configuring the kernel

Re: [PATCH] Reset PCIe devices to stop ongoing DMA

2013-05-07 Thread Don Dutile
On 05/07/2013 03:09 AM, Takao Indoh wrote: Sorry for the delayed response. (2013/04/30 23:54), Sumner, William wrote: I have installed your original patch set (from last November) and tested with three platforms, each with a different IO configuration. On the first platform crashdumps

Re: decent performance drop for SCSI LLD / SAN initiator when iommu is turned on

2013-05-07 Thread Or Gerlitz
On Tue, May 7, 2013 at 3:22 PM, Michael S. Tsirkin m...@redhat.com wrote: But why isn't iommu=pt effective? AFAIK the whole point of it was to give up on security for host-controlled devices, but still get a measure of security for assigned devices. Good questions, from the tests Yan did so

Re: [PATCH] Reset PCIe devices to stop ongoing DMA

2013-05-07 Thread Alex Williamson
On Wed, 2013-04-24 at 13:58 +0900, Takao Indoh wrote: This patch resets PCIe devices on boot to stop ongoing DMA. When pci=pcie_reset_devices is specified, a hot reset is triggered on each PCIe root port and downstream port to reset its downstream endpoint. Problem: This patch solves the

Re: [PATCH] documentation: iommu: add description of ARM System MMU binding

2013-05-07 Thread Olav Haugan
Hi Will, On 4/24/2013 2:55 AM, Will Deacon wrote: On Tue, Apr 23, 2013 at 11:54:53PM +0100, Olav Haugan wrote: On 4/18/2013 12:01 PM, Will Deacon wrote: Getting phandles has no dependencies on anything -- the only dependency is that the device is added to the bus on which the SMMU sits, just

Re: [PATCH] Reset PCIe devices to stop ongoing DMA

2013-05-07 Thread Alex Williamson
On Tue, 2013-05-07 at 16:10 -0400, Don Dutile wrote: On 05/07/2013 12:39 PM, Alex Williamson wrote: On Wed, 2013-04-24 at 13:58 +0900, Takao Indoh wrote: This patch resets PCIe devices on boot to stop ongoing DMA. When pci=pcie_reset_devices is specified, a hot reset is triggered on each