Re: [Intel-gfx] [PATCH] drm/i915: Do not enable movntdqa optimization in hypervisor guest

2017-12-24 Thread Du, Changbin
On Fri, Dec 22, 2017 at 11:11:15AM +, Chris Wilson wrote: > Quoting changbin...@intel.com (2017-12-22 06:31:49) > > From: Changbin Du > > > > Our QA reported a problem caused by movntdqa instructions. Currently, > > the KVM hypervisor doesn't support VEX-prefix

Re: [Intel-gfx] [PATCH] drm/i915: Do not enable movntdqa optimization in hypervisor guest

2017-12-22 Thread Chris Wilson
Quoting changbin...@intel.com (2017-12-22 06:31:49) > From: Changbin Du > > Our QA reported a problem caused by movntdqa instructions. Currently, > the KVM hypervisor doesn't support VEX-prefix instructions emulation. > If users passthrough a GPU to guest with vfio option

[Intel-gfx] [PATCH] drm/i915: Do not enable movntdqa optimization in hypervisor guest

2017-12-21 Thread changbin . du
From: Changbin Du Our QA reported a problem caused by movntdqa instructions. Currently, the KVM hypervisor doesn't support VEX-prefix instructions emulation. If users passthrough a GPU to guest with vfio option 'x-no-mmap=on', then all access to the BARs will be trapped