Re: [Xen-devel] [PATCH RFC 0/3] x86: Full support of PAT

2014-08-20 Thread H. Peter Anvin
On 08/20/2014 07:21 AM, Jan Beulich wrote: > > But you're aware that for the last two major releases Xen hasn't been > supporting > 32-bit CPUs at all anymore? I.e. why should we limit functionality under Xen > based on errata on 64-bit-incapable CPUs? > Because there is no fscking way we're do

Re: [Xen-devel] [PATCH RFC 0/3] x86: Full support of PAT

2014-08-20 Thread Jan Beulich
>>> One Thousand Gnomes 08/20/14 2:08 PM >>> >> The Linux kernel currently supports only 4 different cache modes. The PAT MSR >> is set up in a way that the setting of _PAGE_PAT in a pte doesn't matter: the >> top 4 entries in the PAT MSR are the same as the 4 lower entries. >> >> This results in