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Groups > linux.kernel > #1465184
| From | "Jan Beulich" <JBeulich@suse.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Xen-devel] XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC |
| Date | 2016-08-18 13:20 +0200 |
| Message-ID | <s7twB-7tk-25@gated-at.bofh.it> (permalink) |
| References | <s7fMZ-62b-3@gated-at.bofh.it> <s7sqR-6Jo-3@gated-at.bofh.it> <s7sAy-6Nh-29@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
>>> On 18.08.16 at 12:16, <andrew.cooper3@citrix.com> wrote: > On 18/08/16 11:06, Jan Beulich wrote: >>>>> On 17.08.16 at 22:32, <konrad.wilk@oracle.com> wrote: >>> Looking at the kernel it assumes that WB is ok for 640KB->1MB. >>> The comment says: >>> " /* Low ISA region is always mapped WB in page table. No need to track > *" >> As per above it's not clear to me what this comment is backed by. > > This states what is in the pagetables. Not the combined result with MTRRs. > > WB in the pagetables and WC/UB in the MTRRs is a legal combination which > functions correctly. True, but then again - haven't I been told multiple times that Linux nowadays prefers to run without using MTRRs? Jan
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XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-08-17 22:40 +0200
Re: XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC "Jan Beulich" <JBeulich@suse.com> - 2016-08-18 12:10 +0200
Re: [Xen-devel] XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC Andrew Cooper <andrew.cooper3@citrix.com> - 2016-08-18 12:20 +0200
Re: [Xen-devel] XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC "Jan Beulich" <JBeulich@suse.com> - 2016-08-18 13:20 +0200
Re: [Xen-devel] XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-08-19 04:40 +0200
Re: [Xen-devel] XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-08-19 17:30 +0200
Re: XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2016-08-19 17:00 +0200
Re: XSA 154 and ISA region (640K -> 1MB) WB cache instead of UC "Jan Beulich" <JBeulich@suse.com> - 2016-08-19 17:20 +0200
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