freebsd-dev/share
Neel Natu 9b1aa8d622 Restructure memory allocation in bhyve to support "devmem".
devmem is used to represent MMIO devices like the boot ROM or a VESA framebuffer
where doing a trap-and-emulate for every access is impractical. devmem is a
hybrid of system memory (sysmem) and emulated device models.

devmem is mapped in the guest address space via nested page tables similar
to sysmem. However the address range where devmem is mapped may be changed
by the guest at runtime (e.g. by reprogramming a PCI BAR). Also devmem is
usually mapped RO or RW as compared to RWX mappings for sysmem.

Each devmem segment is named (e.g. "bootrom") and this name is used to
create a device node for the devmem segment (e.g. /dev/vmm/testvm.bootrom).
The device node supports mmap(2) and this decouples the host mapping of
devmem from its mapping in the guest address space (which can change).

Reviewed by:	tychon
Discussed with:	grehan
Differential Revision:	https://reviews.freebsd.org/D2762
MFC after:	4 weeks
2015-06-18 06:00:17 +00:00
..
colldef Add META_MODE support. 2015-06-13 19:20:56 +00:00
dict Add META_MODE support. 2015-06-13 19:20:56 +00:00
doc Add META_MODE support. 2015-06-13 19:20:56 +00:00
dtrace Add META_MODE support. 2015-06-13 19:20:56 +00:00
examples Restructure memory allocation in bhyve to support "devmem". 2015-06-18 06:00:17 +00:00
i18n new depends 2015-06-16 23:37:19 +00:00
keys Remove scary comment about this being a test key. 2014-01-13 20:55:15 +00:00
man Bump date. 2015-06-17 22:06:27 +00:00
me Add META_MODE support. 2015-06-13 19:20:56 +00:00
misc Add META_MODE support. 2015-06-13 19:20:56 +00:00
mk Normally a staging conflict causes an error. 2015-06-16 23:06:43 +00:00
mklocale Add META_MODE support. 2015-06-13 19:20:56 +00:00
monetdef Add META_MODE support. 2015-06-13 19:20:56 +00:00
msgdef Add META_MODE support. 2015-06-13 19:20:56 +00:00
numericdef Add META_MODE support. 2015-06-13 19:20:56 +00:00
security Add META_MODE support. 2015-06-13 19:20:56 +00:00
sendmail Add META_MODE support. 2015-06-13 19:20:56 +00:00
skel Add META_MODE support. 2015-06-13 19:20:56 +00:00
snmp Add META_MODE support. 2015-06-13 19:20:56 +00:00
syscons Add META_MODE support. 2015-06-13 19:20:56 +00:00
tabset Add META_MODE support. 2015-06-13 19:20:56 +00:00
termcap Add META_MODE support. 2015-06-13 19:20:56 +00:00
tests Add some sample test programs. 2013-11-18 12:57:46 +00:00
timedef Add META_MODE support. 2015-06-13 19:20:56 +00:00
vt kbdmap(1): Correct menu title: keyboards have a layout, not a language 2015-05-14 18:09:56 +00:00
zoneinfo Add META_MODE support. 2015-06-13 19:20:56 +00:00
Makefile Only build share/dtrace if MK_CDDL != no 2015-01-25 00:32:17 +00:00
Makefile.inc