Finish merging from head, messed up in previous attempt

Merge from head

Merge r286744-r287584 from head.

Merge ^/head r286858 through r287489.

Merge from HEAD

Code cleanup unused-but-set-variable spotted by gcc.

Reviewed by: royger
Approved by: bapt (mentor)
Differential Revision: D3476

xen: allow disabling PV disks and nics

Introduce two new loader tunnables that can be used to disable PV disks and
PV nics at boot time. They default to 0 and should be set to 1 (or any
number diffe

xen: allow disabling PV disks and nics

Introduce two new loader tunnables that can be used to disable PV disks and
PV nics at boot time. They default to 0 and should be set to 1 (or any
number different than 0) in order to disable the PV devices:

hw.xen.disable_pv_disks=1
hw.xen.disable_pv_nics=1

In /boot/loader.conf will disable both PV disks and nics.

Sponsored by: Citrix Systems R&D
Tested by: Karl Pielorz <kpielorz_lst@tdx.co.uk>
MFC after: 1 week

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Merge ^/head r286697 through r286857.

Remove another remnant of PV domU support and assume that we always run
with an automatically translated physmap under XEN.

Reviewed by: royger (earlier version)
Differential Revision: https://revie

Remove another remnant of PV domU support and assume that we always run
with an automatically translated physmap under XEN.

Reviewed by: royger (earlier version)
Differential Revision: https://reviews.freebsd.org/D3325

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Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285924 through r286421.

Remove some more vestiges of the Xen PV domu support. Specifically,
use vtophys() directly instead of vtomach() and retire the no-longer-used
headers <machine/xenfunc.h> and <machine/xenvar.h>.

Rep

Remove some more vestiges of the Xen PV domu support. Specifically,
use vtophys() directly instead of vtomach() and retire the no-longer-used
headers <machine/xenfunc.h> and <machine/xenvar.h>.

Reported by: bde (stale bits in <machine/xenfunc.h>)
Reviewed by: royger (earlier version)
Differential Revision: https://reviews.freebsd.org/D3266

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Merge ^/head r284737 through r285152.

netfront: preserve configuration across migrations

Try to preserve the xn configuration when migrating. This is not always
possible since the backend might not have the same set of options
available

netfront: preserve configuration across migrations

Try to preserve the xn configuration when migrating. This is not always
possible since the backend might not have the same set of options
available, in which case we will try to preserve as many as possible.

MFC after: 2 weeks
PR: 183139
Reported by: mcdouga9@egr.msu.edu
Sponsored by: Citrix Systems R&D

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Catch up with HEAD (r280229-r284686).

MFH: r282615-r283655

Sponsored by: The FreeBSD Foundation

Merge sync of head

CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten
years for head. However, it is continuously misused as the mpsafe argument
for callout_init(9). Deprecate the flag and cle

CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten
years for head. However, it is continuously misused as the mpsafe argument
for callout_init(9). Deprecate the flag and clean up callout_init() calls
to make them more consistent.

Differential Revision: https://reviews.freebsd.org/D2613
Reviewed by: jhb
MFC after: 2 weeks

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netfront: wait for backend to connect before sending ARP

Netfront has to wait for the backend to switch to state XenbusStateConnected
before sending the ARP request, or else the backend might not be

netfront: wait for backend to connect before sending ARP

Netfront has to wait for the backend to switch to state XenbusStateConnected
before sending the ARP request, or else the backend might not be connected
and thus the packet will be lost.

Sponsored by: Citrix Systems R&D
MFC after: 1 week

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Merge from head

MFH: r281855-r282312

Sponsored by: The FreeBSD Foundation

Remove support for Xen PV domU kernels. Support for HVM domU kernels
remains. Xen is planning to phase out support for PV upstream since it
is harder to maintain and has more overhead. Modern x86

Remove support for Xen PV domU kernels. Support for HVM domU kernels
remains. Xen is planning to phase out support for PV upstream since it
is harder to maintain and has more overhead. Modern x86 CPUs include
virtualization extensions that support HVM guests instead of PV guests.
In addition, the PV code was i386 only and not as well maintained recently
as the HVM code.
- Remove the i386-only NATIVE option that was used to disable certain
components for PV kernels. These components are now standard as they
are on amd64.
- Remove !XENHVM bits from PV drivers.
- Remove various shims required for XEN (e.g. PT_UPDATES_FLUSH, LOAD_CR3,
etc.)
- Remove duplicate copy of <xen/features.h>.
- Remove unused, i386-only xenstored.h.

Differential Revision: https://reviews.freebsd.org/D2362
Reviewed by: royger
Tested by: royger (i386/amd64 HVM domU and amd64 PVH dom0)
Relnotes: yes

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MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

MFH: r281668 through r281783

Sponsored by: The FreeBSD Foundation

Remove unused variable.

Differential Revision: D2333
Reviewed by: royger