Re: AMD Ryzen KVM/NPT/IOMMU issue

2017-10-24 Thread Nick Sarnie
On Tue, Oct 24, 2017 at 5:39 PM, geoff--- via iommu wrote: > On 2017-10-25 08:31, Alex Williamson wrote: >> >> On Wed, 25 Oct 2017 07:16:46 +1100 >> geoff--- via iommu wrote: >> >>> I have isolated it to a single change, although I do not completely >>> understand what other implications it might

Re: AMD Ryzen KVM/NPT/IOMMU issue

2017-10-16 Thread Nick Sarnie
On Wed, Jun 28, 2017 at 2:53 PM, Suravee Suthikulpanit wrote: > > > On 6/29/17 00:26, Steven Walter wrote: >>> >>> So, I'm trying to reproduce this issue on the Ryzen system w/ the >>> following >>> setup: >>> >>> * Host kernel v4.11 (with this patch >>> https://lkml.org/lkml/2017/6/23/295) >>>

Re: AMD Ryzen KVM/NPT/IOMMU issue

2017-06-28 Thread Nick Sarnie
On Wed, Jun 28, 2017 at 9:50 PM, Thiago Padilha wrote: > Some more data from 3DMark benchmarks: > > Time Spy(DirectX 12): > - Graphics test 1: > - npt=0: 37.65 FPS > - npt=1: 24.22 FPS (36% drop) > - Graphics test 2: > - npt=0: 33.05 FPS > - npt=1: 29.65 FPS (10% drop) > - CPU test: > -

Re: AMD Ryzen KVM/NPT/IOMMU issue

2017-06-28 Thread Nick Sarnie
On Wed, Jun 28, 2017 at 4:33 PM, Paolo Bonzini wrote: > > > On 28/06/2017 21:52, Graham Neville wrote: >> Although not related to graphics card performance, there is definitely >> another issue with regards to running KVM nested L2 guests when npt=1. >> >> Thought I'd mention this in case it helps

Re: AMD Ryzen KVM/NPT/IOMMU issue

2017-06-24 Thread Nick Sarnie
On Fri, May 5, 2017 at 1:27 PM, Alex Williamson wrote: > On Wed, 3 May 2017 12:28:35 -0400 > Nick Sarnie wrote: > >> On Wed, May 3, 2017 at 10:37 AM, Matthias Ehrenfeuchter >> wrote: >> > Hi, >> > >> > There are a lot of messages/threads out t

Re: [PATCH v6 00/34] x86: Secure Memory Encryption (AMD)

2017-06-07 Thread Nick Sarnie
On Wed, Jun 7, 2017 at 3:13 PM, Tom Lendacky wrote: > This patch series provides support for AMD's new Secure Memory Encryption > (SME) > feature. > > SME can be used to mark individual pages of memory as encrypted through the > page tables. A page of memory that is marked encrypted will be autom

Re: [PATCH v6 26/34] iommu/amd: Allow the AMD IOMMU to work with memory encryption

2017-06-07 Thread Nick Sarnie
On Wed, Jun 7, 2017 at 3:17 PM, Tom Lendacky wrote: > The IOMMU is programmed with physical addresses for the various tables > and buffers that are used to communicate between the device and the > driver. When the driver allocates this memory it is encrypted. In order > for the IOMMU to access the

Re: AMD Ryzen KVM/NPT/IOMMU issue

2017-05-03 Thread Nick Sarnie
On Wed, May 3, 2017 at 10:37 AM, Matthias Ehrenfeuchter wrote: > Hi, > > There are a lot of messages/threads out there about bad performance while > using AMDs Ryzen with KVM GPU passthrough. It revolves all on > enabling/disabling npt, while enabled overall VM performance is nice but the > GPU pe

AMD Nested Paging Performance Issues

2017-04-07 Thread Nick Sarnie
test any patches or provide any more information. Thank you, Nick Sarnie ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu