Commit Graph

12550 Commits

Author SHA1 Message Date
Konstantin Belousov
65f99c74fb Clear the kernel grab of the FPU state on fork. The pcb_save pointer
is already correctly reset to the FPU user save area, only PCB_KERNFPU
flag might leak from old thread state into the new state.

For creation of the user-mode thread, the change is nop since
corresponding syscall code does not use FPU.  On the other hand,
creation of a kernel thread forks from a thread selected arbitrary
from proc0, which might use FPU.

Reported and tested by:	Chris Torek <torek@torek.net>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2014-03-29 11:56:33 +00:00
Warner Losh
3ad1a09169 Rather than require a makeoptions DEBUG to get debug correct,
add it in kern.mk, but only if we're using clang. While this
option is supported by both clang and gcc, in the future there
may be changes to clang which change the defaults that require
a tweak to build our kernel such that other tools in our tree
will work. Set a good example by forcing -gdwarf-2 only for
clang builds, and only if the user hasn't specified another
dwarf level already. Update UPDATING to reflect the changed
state of affairs. This also keeps us from having to update
all the ARM kernels to add this, and also keeps us from
in the future having to update all the MIPS kernels and is
one less place the user will have to know to do something
special for clang and one less thing developers will need
to do when moving an architecture to clang.

Reviewed by:	ian@
MFC after:	1 week
2014-03-25 22:08:31 +00:00
Bryan Drewery
44f1c91610 Rename global cnt to vm_cnt to avoid shadowing.
To reduce the diff struct pcu.cnt field was not renamed, so
PCPU_OP(cnt.field) is still used. pc_cnt and pcpu are also used in
kvm(3) and vmstat(8). The goal was to not affect externally used KPI.

Bump __FreeBSD_version_ in case some out-of-tree module/code relies on the
the global cnt variable.

Exp-run revealed no ports using it directly.

No objection from:	arch@
Sponsored by:	EMC / Isilon Storage Division
2014-03-22 10:26:09 +00:00
Warner Losh
f79309d29c Remove vestiges of knowing the ISA bus, which we gave up on around 20
years ago. Remove redunant copy of isaregs.h.
2014-03-19 21:03:04 +00:00
Mark Johnston
3e0ba3a163 Only invoke fasttrap hooks for traps from user mode, and ensure that they're
called with interrupts enabled. Calling fasttrap_pid_probe() with interrupts
disabled can lead to deadlock if fasttrap writes to the process' address
space.

Reviewed by:	rpaulo
MFC after:	3 weeks
2014-03-19 01:27:56 +00:00
Warner Losh
d4f95c889d In kernel config files, it is supposed to be 'options<space><tab>' not
'options<tab><tab>', per long standing (but recently not so strictly
enforced) convention.
2014-03-18 14:41:18 +00:00
Warner Losh
6a5b1a3544 Align all comments in config files on same column. This consistency
helps when bits and pieces of GENERIC from i386 or amd64 are cut and
pasted into other architecture's config files (which in the case of
ARM had gotten rather akimbo).
2014-03-16 15:22:52 +00:00
Robert Watson
4a14441044 Update kernel inclusions of capability.h to use capsicum.h instead; some
further refinement is required as some device drivers intended to be
portable over FreeBSD versions rely on __FreeBSD_version to decide whether
to include capability.h.

MFC after:	3 weeks
2014-03-16 10:55:57 +00:00
Gleb Smirnoff
45c203fce2 Remove AppleTalk support.
AppleTalk was a network transport protocol for Apple Macintosh devices
in 80s and then 90s. Starting with Mac OS X in 2000 the AppleTalk was
a legacy protocol and primary networking protocol is TCP/IP. The last
Mac OS X release to support AppleTalk happened in 2009. The same year
routing equipment vendors (namely Cisco) end their support.

Thus, AppleTalk won't be supported in FreeBSD 11.0-RELEASE.
2014-03-14 06:29:43 +00:00
Gleb Smirnoff
2c284d9395 Remove IPX support.
IPX was a network transport protocol in Novell's NetWare network operating
system from late 80s and then 90s. The NetWare itself switched to TCP/IP
as default transport in 1998. Later, in this century the Novell Open
Enterprise Server became successor of Novell NetWare. The last release
that claimed to still support IPX was OES 2 in 2007. Routing equipment
vendors (e.g. Cisco) discontinued support for IPX in 2011.

Thus, IPX won't be supported in FreeBSD 11.0-RELEASE.
2014-03-14 02:58:48 +00:00
Warner Losh
22b8ff24b5 Delete stray clause 3 (Advertising clause) and renumber while i'm
here.

Approved by: alc@
2014-03-11 23:41:35 +00:00
Warner Losh
846351f8b3 Remove clause 3 (the advertising clause), per the regent's letter. 2014-03-11 17:20:50 +00:00
Roger Pau Monné
4d30a3fb95 xen: use the same hypercall mechanism for XEN and XENHVM
Currently XEN (PV) and XENHVM (PVHVM) ports use different ways to
issue hypercalls, unify this by filling the hypercall_page under HVM
also.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

amd64/include/xen/hypercall.h:
 - Unify Xen hypercall code by always using the PV way.

i386/i386/locore.s:
 - Define hypercall_page on i386 XENHVM.

x86/xen/hvm.c:
 - Fill hypercall_page on XENHVM kernels using the HVM method (only
   when running as an HVM guest).
2014-03-11 10:24:13 +00:00
Roger Pau Monné
5f05c79450 xen: implement an early timer for Xen PVH
When running as a PVH guest, there's no emulated i8254, so we need to
use the Xen PV timer as the early source for DELAY. This change allows
for different implementations of the early DELAY function and
implements a Xen variant for it.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

dev/xen/timer/timer.c:
dev/xen/timer/timer.h:
 - Implement Xen early delay functions using the PV timer and declare
   them.

x86/include/init.h:
 - Add hooks for early clock source initialization and early delay
   functions.

i386/i386/machdep.c:
pc98/pc98/machdep.c:
amd64/amd64/machdep.c:
 - Set early delay hooks to use the i8254 on bare metal.
 - Use clock_init (that will in turn make use of init_ops) to
   initialize the early clock source.

amd64/include/clock.h:
i386/include/clock.h:
 - Declare i8254_delay and clock_init.

i386/xen/clock.c:
 - Rename DELAY to i8254_delay.

x86/isa/clock.c:
 - Introduce clock_init that will take care of initializing the early
   clock by making use of the init_ops hooks.
 - Move non ISA related delay functions to the newly introduced delay
   file.

x86/x86/delay.c:
 - Add moved delay related functions.
 - Implement generic DELAY function that will use the init_ops hooks.

x86/xen/pv.c:
 - Set PVH hooks for the early delay related functions in init_ops.

conf/files.amd64:
conf/files.i386:
conf/files.pc98:
 - Add delay.c to the kernel build.
2014-03-11 10:20:42 +00:00
Roger Pau Monné
aa389b4f8c howto_names: unify declaration
Approved by: gibbs
Sponsored by: Citrix Systems R&D

boot/i386/efi/bootinfo.c:
boot/i386/libi386/bootinfo.c:
boot/ia64/common/bootinfo.c:
boot/powerpc/ofw/metadata.c:
boot/powerpc/ps3/metadata.c:
boot/sparc64/loader/metadata.c:
boot/uboot/common/metadata.c:
boot/userboot/userboot/bootinfo.c:
i386/xen/xen_machdep.c:
 - Include sys/boot.h
 - Remove custom definition of howto_names.

sys/boot.h:
 - Define howto_names.

x86/xen/pv.c:
 - Include sys/boot.h
2014-03-11 10:13:06 +00:00
Roger Pau Monné
c203fa6940 xen: add and enable Xen console for PVH guests
This adds and enables the PV console used on XEN kernels to
GENERIC/XENHVM kernels in order for it to be used on PVH.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

dev/xen/console/console.c:
 - Define console_page.
 - Move xc_printf debug function from i386 XEN code to generic console
   code.
 - Rework xc_printf.
 - Use xen_initial_domain instead of open-coded checks for Dom0.
 - Gate the attach of the PV console to PV(H) guests.

dev/xen/console/xencons_ring.c:
 - Allow the PV Xen console to output earlier by directly signaling
   the event channel in start_info if the event channel is not yet
   initialized.
 - Use HYPERVISOR_start_info instead of xen_start_info.

i386/include/xen/xen-os.h:
 - Remove prototype for xc_printf since it's now declared in global
   xen-os.h

i386/xen/xen_machdep.c:
 - Remove previous version of xc_printf.
 - Remove definition of console_page (now it's defined in the console
   itself).
 - Fix some printf formatting errors.

x86/xen/pv.c:
 - Add some early boot debug messages using xc_printf.
 - Set console_page based on the value passed in start_info.

xen/xen-os.h:
 - Declare console_page and add prototype for xc_printf.
2014-03-11 10:09:23 +00:00
Roger Pau Monné
1a9cdd373a xen: add PV/PVH kernel entry point
Add the PV/PVH entry point and the low level functions for PVH
early initialization.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

amd64/amd64/genassym.c:
 - Add __FreeBSD_version define to assym.s so it can be used for the
   Xen notes.

amd64/amd64/locore.S:
 - Make bootstack global so it can be used from Xen kernel entry
   point.

amd64/amd64/xen-locore.S:
 - Add Xen notes to the kernel.
 - Add the Xen PV entry point, that is going to call hammer_time_xen.

amd64/include/asmacros.h:
 - Add ELFNOTE macros.

i386/xen/xen_machdep.c:
 - Define HYPERVISOR_start_info for the XEN i386 PV port, which is
   going to be used in some shared code between PV and PVH.

x86/xen/hvm.c:
 - Define HYPERVISOR_start_info for the PVH port.

x86/xen/pv.c:
 - Introduce hammer_time_xen which is going to perform early setup for
   Xen PVH:
    - Setup shared Xen variables start_info, shared_info and
      xen_store.
    - Set guest type.
    - Create initial page tables as FreeBSD expects to find them.
    - Call into native init function (hammer_time).

xen/xen-os.h:
 - Declare HYPERVISOR_start_info.

conf/files.amd64:
 - Add amd64/amd64/locore.S and x86/xen/pv.c to the list of files.
2014-03-11 10:07:01 +00:00
Roger Pau Monné
e8da1c4877 amd64/i386: switch IPI handlers to C code.
Move asm IPIs handlers to C code, so both Xen and native IPI handlers
share the same code.

Reviewed by: jhb
Approved by: gibbs
Sponsored by: Citrix Systems R&D

amd64/amd64/apic_vector.S:
i386/i386/apic_vector.s:
 - Remove asm coded IPI handlers and instead call the newly introduced
   C variants.

amd64/amd64/mp_machdep.c:
i386/i386/mp_machdep.c:
 - Add C coded clones to the asm IPI handlers (moved from
   x86/xen/hvm.c).

i386/include/smp.h:
amd64/include/smp.h:
 - Add prototypes for the C IPI handlers.

x86/xen/hvm.c:
 - Move the C IPI handlers to mp_machdep and call those in the Xen IPI
   handlers.

i386/xen/mp_machdep.c:
 - Add dummy IPI handlers to the i386 Xen PV port (this port doesn't
   support SMP).
2014-03-11 10:03:29 +00:00
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
Dimitry Andric
ea4e0ab0cc After r261980, the local ptr variable in xbox_init() is no longer used,
breaking the LINT build.

Pointy hat to:	brueffer
2014-02-16 22:48:36 +00:00
Dimitry Andric
f785676f2a Upgrade our copy of llvm/clang to 3.4 release. This version supports
all of the features in the current working draft of the upcoming C++
standard, provisionally named C++1y.

The code generator's performance is greatly increased, and the loop
auto-vectorizer is now enabled at -Os and -O2 in addition to -O3.  The
PowerPC backend has made several major improvements to code generation
quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ
backends have all seen major feature work.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.4/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html>

MFC after:	1 month
2014-02-16 19:44:07 +00:00
Christian Brueffer
5aabe0d7b8 Remove an nve(4)-specific workaround from the xbox port. nfe(4) doesn't
need it.

Reviewed by:	ed
2014-02-16 14:35:19 +00:00
Christian Brueffer
7f47cbd3ce Retire the nve(4) driver; nfe(4) has been the default driver for NVIDIA
nForce MCP adapters for a long time.

Yays:	jhb, remko, yongari
Nays:	none on the current and stable lists
2014-02-16 12:22:43 +00:00
Andriy Gapon
f25e50cf0b provide fast versions of ffsl and flsl for i386; ffsll and flsll for amd64
Reviewed by:	jhb
MFC after:	10 days
X-MFC note:	consider thirdparty modules depending on these symbols
Sponsored by:	HybridCluster
2014-02-14 15:18:37 +00:00
John Baldwin
4edef187b8 Add support for managing PCI bus numbers. As with BARs and PCI-PCI bridge
I/O windows, the default is to preserve the firmware-assigned resources.
PCI bus numbers are only managed if NEW_PCIB is enabled and the architecture
defines a PCI_RES_BUS resource type.
- Add a helper API to create top-level PCI bus resource managers for each
  PCI domain/segment.  Host-PCI bridge drivers use this API to allocate
  bus numbers from their associated domain.
- Change the PCI bus and CardBus drivers to allocate a bus resource for
  their bus number from the parent PCI bridge device.
- Change the PCI-PCI and PCI-CardBus bridge drivers to allocate the
  full range of bus numbers from secbus to subbus from their parent bridge.
  The drivers also always program their primary bus register.  The bridge
  drivers also support growing their bus range by extending the bus resource
  and updating subbus to match the larger range.
- Add support for managing PCI bus resources to the Host-PCI bridge drivers
  used for amd64 and i386 (acpi_pcib, mptable_pcib, legacy_pcib, and qpi_pcib).
- Define a PCI_RES_BUS resource type for amd64 and i386.

Reviewed by:	imp
MFC after:	1 month
2014-02-12 04:30:37 +00:00
John Baldwin
4f67a8c5e9 Don't waste a page of KVA for the boot-time memory test on x86. For amd64,
reuse the first page of the crashdumpmap as CMAP1/CADDR1.  For i386,
remove CMAP1/CADDR1 entirely and reuse CMAP3/CADDR3 for the memory test.

Reviewed by:	alc, peter
MFC after:	2 weeks
2014-02-11 22:02:40 +00:00
John Baldwin
e07ef9b0f6 Move <machine/apicvar.h> to <x86/apicvar.h>. 2014-01-23 20:10:22 +00:00
Ed Maste
80f9f1580e Add VT kernel configuration to ease testing of vt(9), aka Newcons 2014-01-19 18:46:38 +00:00
Bryan Venteicher
10c4018057 Add very simple virtio_random(4) driver to harvest entropy from host
Reviewed by:	markm (random bits only)
2014-01-18 06:14:38 +00:00
Gavin Atkinson
56c63f28ed Remove spaces from boot messages when we print the CPU ID/Family/Stepping
to match the rest of the CPU identification lines, and once again fit
into 80 columns in the usual case.
2014-01-11 22:41:10 +00:00
Sergey Kandaurov
5fdb319121 Nuke symbols.raw
This file seems to be unused since the switch to the ELF binary format.

Discussed with:	jhb
2013-12-17 07:47:27 +00:00
John Baldwin
316032ad20 Move constants for indices in the local APIC's local vector table from
apicvar.h to apicreg.h.
2013-12-09 21:08:52 +00:00
John Baldwin
5c79f1f9df Fix a typo. 2013-12-05 21:58:02 +00:00
Xin LI
96632c1b9c Enable Hyper-V support in i386 GENERIC.
MFC after:	2 weeks
2013-12-05 00:56:50 +00:00
Xin LI
0ad3455e41 Support Hyper-V on i386:
- Add 'hyperv' module into build;
 - Allow building Hyper-V support as part of the kernel;
 - Hook Hyper-V build into NOTES.

This is intended for MFC if re@ permits.

MFC after:	3 days
2013-12-05 00:54:38 +00:00
Eitan Adler
7a22215c53 Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit.  Instead use (1U << 31) which gets the
expected result.

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.

Discussed with:	-arch, rdivacky
Reviewed by:	cperciva
2013-11-30 22:17:27 +00:00
Pawel Jakub Dawidek
f2b525e6b9 Make process descriptors standard part of the kernel. rwhod(8) already
requires process descriptors to work and having PROCDESC in GENERIC
seems not enough, especially that we hope to have more and more consumers
in the base.

MFC after:	3 days
2013-11-30 15:08:35 +00:00
Attilio Rao
54366c0bd7 - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging
option, unbreak the lock tracing release semantic by embedding
  calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined
  version of the releasing functions for mutex, rwlock and sxlock.
  Failing to do so skips the lockstat_probe_func invokation for
  unlocking.
- As part of the LOCKSTAT support is inlined in mutex operation, for
  kernel compiled without lock debugging options, potentially every
  consumer must be compiled including opt_kdtrace.h.
  Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the
  dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES
  is linked there and it is only used as a compile-time stub [0].

[0] immediately shows some new bug as DTRACE-derived support for debug
in sfxge is broken and it was never really tested.  As it was not
including correctly opt_kdtrace.h before it was never enabled so it
was kept broken for a while.  Fix this by using a protection stub,
leaving sfxge driver authors the responsibility for fixing it
appropriately [1].

Sponsored by:	EMC / Isilon storage division
Discussed with:	rstone
[0] Reported by:	rstone
[1] Discussed with:	philip
2013-11-25 07:38:45 +00:00
Ed Maste
da71787841 Refactor i386 startup SMAP parsing
This is a port from amd64 of r258436, and is intended to make diffs
(against amd64 and for future UEFI work) easier to review.

Reviewed by:	jhb@
Sponsored by:	The FreeBSD Foundation
2013-11-22 18:31:07 +00:00
Andreas Tobler
646c5b4840 Replace the WEAK_ALIAS() alias with the WEAK_REFERENCE() alias. Use it and
get rid of the __CONCAT and CNAME macros.

Reviewed by:	bde, kib
2013-11-21 22:31:18 +00:00
Justin T. Gibbs
4fd76feafd Fix accounting for hw.realmem on the i386 and amd64 platforms.
sys/i386/i386/machdep.c:
sys/amd64/amd64/machdep.c:
	The value reported by FreeBSD as "real memory" when booting
	doesn't match what is later reported by sysctl as hw.realmem.
	This is due to the fact that the value printed during the
	boot process is fetched from smbios data (when possible),
	and accounts for holes in physical memory. On the other
	hand, the value of hw.realmem is unconditionally set to be
	one larger than the highest page of the physical address
	space.

	Fix this by setting hw.realmem to the same value printed
	during boot, this makes hw.realmem honour it's name and
	account properly for physical memory present in the system.

Submitted by:	Roger Pau Monné
Reviewed by:	gibbs
2013-11-15 16:05:55 +00:00
Ed Maste
3d271aaab0 x86: Allow users to change PSL_RF via ptrace(PT_SETREGS...)
Debuggers may need to change PSL_RF.  Note that tf_eflags is already stored
in the signal context during signal handling and PSL_RF previously could be
modified via sigreturn, so this change should not provide any new ability
to userspace.

For background see the thread at:
http://lists.freebsd.org/pipermail/freebsd-i386/2007-September/005910.html

Reviewed by:	jhb, kib
Sponsored by:	DARPA, AFRL
2013-11-14 15:37:20 +00:00
Dimitry Andric
62f34c2aac Disable building the ctl module for the i386 XEN kernel configuration
for now, since it causes gcc warnings about casting 64 bit bus_addr_t's
to 32 bit pointers, and vice versa.

Reviewed by:	ken
MFC after:	3 days
2013-11-11 21:16:55 +00:00
Konstantin Belousov
760faf9fdd Fix signal delivery for the iBCS2 binaries. The iBCS2 sysvec uses
current FreeBSD signal trampoline, but does not specifies
sv_sigcode_base, since shared page is not mapped.  This results in the
zero %eip for the signal frame.  Fall back to calculating %eip as
offset from the psstrings when sv_sigcode_base is not initialized.

Reported by:	Rich Naill <rich@enterprisesystems.net>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2013-11-08 16:57:55 +00:00
Konstantin Belousov
6f8a44a5dd Add bits for the AMD features from CPUID function 0x80000001 ECX,
described in the rev. 3.0 of the Kabini BKDG, document 48751.pdf.

Partially based on the patch submitted by:	Dmitry Luhtionov <dmitryluhtionov@gmail.com>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2013-11-08 16:32:30 +00:00
Alan Cox
c70af4875e As of r257209, all architectures have defined VM_KMEM_SIZE_SCALE. In other
words, every architecture is now auto-sizing the kmem arena.  This revision
changes kmeminit() so that the definition of VM_KMEM_SIZE_SCALE becomes
mandatory and the definition of VM_KMEM_SIZE becomes optional.

Replace or eliminate all existing definitions of VM_KMEM_SIZE.  With
auto-sizing enabled, VM_KMEM_SIZE effectively became an alternate spelling
for VM_KMEM_SIZE_MIN on most architectures.  Use VM_KMEM_SIZE_MIN for
clarity.

Change kmeminit() so that the effect of defining VM_KMEM_SIZE is similar to
that of setting the tunable vm.kmem_size.  Whereas the macros
VM_KMEM_SIZE_{MAX,MIN,SCALE} have had the same effect as the tunables
vm.kmem_size_{max,min,scale}, the effects of VM_KMEM_SIZE and vm.kmem_size
have been distinct.  In particular, whereas VM_KMEM_SIZE was overridden by
VM_KMEM_SIZE_{MAX,MIN,SCALE} and vm.kmem_size_{max,min,scale}, vm.kmem_size
was not.  Remedy this inconsistency.  Now, VM_KMEM_SIZE can be used to set
the size of the kmem arena at compile-time without that value being
overridden by auto-sizing.

Update the nearby comments to reflect the kmem submap being replaced by the
kmem arena.  Stop duplicating the auto-sizing formula in every machine-
dependent vmparam.h and place it in kmeminit() where auto-sizing takes
place.

Reviewed by:	kib (an earlier version)
Sponsored by:	EMC / Isilon Storage Division
2013-11-08 16:25:00 +00:00
Mark Johnston
57170f49f2 Remove references to an unused fasttrap probe hook, and remove the
corresponding x86 trap type. Userland DTrace probes are currently handled
by the other fasttrap hooks (dtrace_pid_probe_ptr and
dtrace_return_probe_ptr).

Discussed with:	rpaulo
2013-10-31 02:35:00 +00:00
Gleb Smirnoff
66e01d73cd - Provide necessary includes.
- Remove unnecessary includes.

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.
2013-10-29 11:17:49 +00:00
Konstantin Belousov
86be9f0dd5 Import the driver for VT-d DMAR hardware, as specified in the revision
1.3 of Intelб╝ Virtualization Technology for Directed I/O Architecture
Specification.  The Extended Context and PASIDs from the rev. 2.2 are
not supported, but I am not aware of any released hardware which
implements them.  Code does not use queued invalidation, see comments
for the reason, and does not provide interrupt remapping services.

Code implements the management of the guest address space per domain
and allows to establish and tear down arbitrary mappings, but not
partial unmapping.  The superpages are created as needed, but not
promoted.  Faults are recorded, fault records could be obtained
programmatically, and printed on the console.

Implement the busdma(9) using DMARs.  This busdma backend avoids
bouncing and provides security against misbehaving hardware and driver
bad programming, preventing leaks and corruption of the memory by wild
DMA accesses.

By default, the implementation is compiled into amd64 GENERIC kernel
but disabled; to enable, set hw.dmar.enable=1 loader tunable.  Code is
written to work on i386, but testing there was low priority, and
driver is not enabled in GENERIC.  Even with the DMAR turned on,
individual devices could be directed to use the bounce busdma with the
hw.busdma.pci<domain>:<bus>:<device>:<function>.bounce=1 tunable.  If
DMARs are capable of the pass-through translations, it is used,
otherwise, an identity-mapping page table is constructed.

The driver was tested on Xeon 5400/5500 chipset legacy machine,
Haswell desktop and E5 SandyBridge dual-socket boxes, with ahci(4),
ata(4), bce(4), ehci(4), mfi(4), uhci(4), xhci(4) devices.  It also
works with em(4) and igb(4), but there some fixes are needed for
drivers, which are not committed yet.  Intel GPUs do not work with
DMAR (yet).

Many thanks to John Baldwin, who explained me the newbus integration;
Peter Holm, who did all testing and helped me to discover and
understand several incredible bugs; and to Jim Harris for the access
to the EDS and BWG and for listening when I have to explain my
findings to somebody.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 month
2013-10-28 13:33:29 +00:00
Glen Barber
6b48eebec6 Document XENHVM and xenpci are mutually inclusive.
Submitted by:   gibbs
Approved by:    re (delphij)
Sponsored by:   The FreeBSD Foundation
2013-10-11 19:40:28 +00:00