Re: [Xen-devel] MTRR and cache programming in Xen

2015-01-14 Thread Jan Beulich
>>> On 13.01.15 at 12:50, wrote: > I apologize for giving the wrong impression. While I agree that I was > trying to avoid going through the source code. I had previously looked > online and found that that Xen did not support MTRR. I guess that is true. It's not - neither for Xen's own use of th

Re: [Xen-devel] MTRR and cache programming in Xen

2015-01-14 Thread ayush ruia
Hi all, I apologize for giving the wrong impression. While I agree that I was trying to avoid going through the source code. I had previously looked online and found that that Xen did not support MTRR. I guess that is true. Anyways, thanks for the feedback. I should be more careful in asking questi

Re: [Xen-devel] MTRR and cache programming in Xen

2015-01-13 Thread Ian Campbell
On Mon, 2015-01-12 at 19:59 -0600, ayush ruia wrote: > Hi all, > Hoping that you could answer a few of my queries regarding cache > properties for Xen. > > Is there any support from Xen for supporting MTRRs or any similar > caching mechanisms such as PAT? How does Xen handle I/O ranges because > d

Re: [Xen-devel] MTRR and cache programming in Xen

2015-01-13 Thread Jan Beulich
>>> On 13.01.15 at 02:59, wrote: > Is there any support from Xen for supporting MTRRs or any similar caching > mechanisms such as PAT? How does Xen handle I/O ranges because different > memory regions may have different caching requirements and any domU can be > allocated I/O regions? Is the contr

[Xen-devel] MTRR and cache programming in Xen

2015-01-12 Thread ayush ruia
Hi all, Hoping that you could answer a few of my queries regarding cache properties for Xen. Is there any support from Xen for supporting MTRRs or any similar caching mechanisms such as PAT? How does Xen handle I/O ranges because different memory regions may have different caching requirements and