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Correct some misundertandings on my part about PV vs HVM kernel

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configuration options.

MFC after:	1 day
This commit is contained in:
Robert Watson 2010-12-17 11:25:37 +00:00
parent 055dac5c25
commit 63f34ca026
1 changed files with 19 additions and 13 deletions
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32
share/man/man4/xen.4
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@ -40,17 +40,14 @@ the following lines in your kernel configuration file:
.Bd -ragged -offset indent
.Cd "options PAE"
.Cd "options XEN"
.Cd "nooptions NATIVE"
.Ed
.Pp
To compile hardware-assisted virtualization (HVM) Xen guest support into an
amd64 kernel, place the following line in your kernel configuration file:
To compile hardware-assisted virtualization (HVM) Xen guest support with
para-virtualized drivers into an amd64 kernel, place the following lines in
your kernel configuration file:
.Bd -ragged -offset indent
.Cd "options XENHVM"
.Ed
.Pp
To compile support for Xenbux and Xen PV drivers into an amd64 or i386
kernel, place the following line in your kernel configuration file:
.Bd -ragged -offset indent
.Cd "device xenpci"
.Ed
.Sh DESCRIPTION
@ -73,7 +70,9 @@ semantics.
.Pp
.Fx
supports a fully para-virtualized (PV) kernel on the i386 architecture using
.Cd "options XEN" ;
.Cd "options XEN"
and
.Cd "nooptions NATIVE" ;
currently, this requires use of a PAE kernel, enabled via
.Cd "options PAE" .
.Pp
@ -81,16 +80,23 @@ currently, this requires use of a PAE kernel, enabled via
supports hardware-assisted virtualization (HVM) on both the i386 and amd64
kernels; however, PV device drivers with an HVM kernel are only supported on
the amd64 architecture, and require
.Cd "options XENHVM" .
.Cd "options XENHVM"
and
.Cd "device xenpci" .
.Pp
Para-virtualized device drivers are required in order to support certain
functionality, such as processing management requests, returning idle
physical memory pages to the hypervisor, etc.
.Ss Xen DomU device drivers
Adding
.Cd "options xenpci"
to the kernel configuration enables the Xen administrative or
para-virtualized drivers:
Xen administrative and para-virtualized drivers are automatically added to
the kernel if a PV kernel is compiled using
.Cd "options XEN" ;
for HVM environments,
.Cd "options XENHVM"
and
.Cd "device xenpci"
are required.
The follow drivers are supported:
.Bl -hang -offset indent -width blkfront
.It Nm balloon
Allow physical memory pages to be returned to the hypervisor as a result of