Re: [Xen-devel] [RFC 0/4] HVM x86 enhancements to run Xen deprivileged mode operations

2015-08-12 Thread Ben Catterall
On 12/08/15 10:50, Jan Beulich wrote: On 06.08.15 at 18:45, wrote: Performance testing --- Performance testing indicates that the overhead for this deprivileged mode is approximately 25%. This overhead is the cost of moving into deprivileged mode and then fully back out of depr

Re: [Xen-devel] [RFC 0/4] HVM x86 enhancements to run Xen deprivileged mode operations

2015-08-12 Thread Jan Beulich
>>> On 06.08.15 at 18:45, wrote: > Performance testing > --- > Performance testing indicates that the overhead for this deprivileged mode is > approximately 25%. This overhead is the cost of moving into deprivileged mode > and then fully back out of deprivileged mode. > > I perfor

[Xen-devel] [RFC 0/4] HVM x86 enhancements to run Xen deprivileged mode operations

2015-08-06 Thread Ben Catterall
Hi all, I have a working base for this and would appreciate feedback at this point to evaluate if it is moving in the right direction. Many thanks in advance, Ben The aim of this work is to create a proof-of-concept to establish if it is feasible to move certain Xen operations into a deprivilege