freebsd-dev/sys/i386
Alan Cox f438547338 When the kernel is running in a virtual machine, it cannot rely upon the
processor family to determine if the workaround for AMD Family 10h Erratum
383 should be enabled.  To enable virtual machine migration among a
heterogeneous collection of physical machines, the hypervisor may have
been configured to report an older processor family with a reduced feature
set.  Effectively, the reported processor family and its features are like
a "least common denominator" for the collection of machines.

Therefore, when the kernel is running in a virtual machine, instead of
relying upon the processor family, we now test for features that prove
that the underlying processor is not affected by the erratum.  (The
features that we test for are unlikely to ever be emulated in software
on an affected physical processor.)

PR:		186061
Tested by:	Simon Matter
Discussed with:	jhb, neel
MFC after:	2 weeks
2014-02-22 18:53:42 +00:00
..
acpica Consistently use round_page(x) rather than roundup(x, PAGE_SIZE). There is 2013-02-15 22:43:08 +00:00
bios This isn't functionally identical. In some cases a hint to disable 2012-10-22 13:06:09 +00:00
conf Upgrade our copy of llvm/clang to 3.4 release. This version supports 2014-02-16 19:44:07 +00:00
i386 When the kernel is running in a virtual machine, it cannot rely upon the 2014-02-22 18:53:42 +00:00
ibcs2 Remove redundant declarations of szsigcode and sigcode in 2013-10-07 16:57:48 +00:00
include provide fast versions of ffsl and flsl for i386; ffsll and flsll for amd64 2014-02-14 15:18:37 +00:00
isa Implement vector callback for PVHVM and unify event channel implementations 2013-08-29 19:52:18 +00:00
linux - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
pci Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this 2013-11-30 22:17:27 +00:00
svr4
xbox After r261980, the local ptr variable in xbox_init() is no longer used, 2014-02-16 22:48:36 +00:00
xen Don't waste a page of KVA for the boot-time memory test on x86. For amd64, 2014-02-11 22:02:40 +00:00
Makefile Delete duplicate tags entry I introduced in -r223901. 2011-07-15 17:27:26 +00:00