Commit Graph

54 Commits

Author SHA1 Message Date
Kyle Evans
d3d381b2b1 userboot: handle guest interpreter mismatches more intelligently
The switch to lualoader creates a problem with userboot: the host is
inclined to build userboot with Lua, but the host userboot's interpreter
must match what's available on the guest. For almost all FreeBSD guests in
the wild, Lua is not yet available and a Lua-based userboot will fail.

This revision updates userboot protocol to version 5, which adds a
swap_interpreter callback to request a different interpreter, and tries to
determine the proper interpreter to be used based on how the guest
/boot/loader is compiled. This is still a bit of a guess, but it's likely
the best possible guess we can make in order to get it right. The
interpreter is now embedded in the resulting executable, so we can open
/boot/loader on the guest and hunt that down to derive the interpreter it
was built with.

Using -l with bhyveload will not allow an intepreter swap, even if the
loader specified happens to be a userboot with the wrong interpreter. We'll
simply complain about the mismatch and bail out.

For legacy guests without the interpreter marker, we assume they're 4th.
For new guests with the interpreter marker, we'll read it and swap over
to the proper interpreter if it doesn't match what the userboot we're using
was compiled with.

Both flavors of userboot are installed by default, userboot_4th.so and
userboot_lua.so. This fixes the build WITHOUT_FORTH as a coincidence, which
was broken by userboot being forced to 4th.

Reviewed by:	imp, jhb, araujo (earlier version)
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D16945
2018-09-01 02:23:45 +00:00
Marcelo Araujo
55afc65efa style(9) remove unnecessary blank tabs.
Obtained from:	TrueOS
MFC after:	4 weeks.
Sponsored by:	iXsystems Inc.
2018-06-13 03:35:24 +00:00
Warner Losh
cb37fc82b1 De-const to match changes in userboot.h
Sponsored by: Netflix
2017-12-06 05:18:52 +00:00
Warner Losh
e8e6a5f920 Make putenv and getenv match the userland definition of these
functions, tweak man page and one variable that shouldn't be const
anymore.

Sponsored by: Netflix
2017-12-06 02:00:00 +00:00
Pedro F. Giffuni
1de7b4b805 various: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00
Warner Losh
ca987d4641 Move sys/boot to stand. Fix all references to new location
Sponsored by:	Netflix
2017-11-14 23:02:19 +00:00
Bryan Drewery
ea825d0274 DIRDEPS_BUILD: Update dependencies.
Sponsored by:	Dell EMC Isilon
2017-10-31 00:07:04 +00:00
Andriy Gapon
6589ee29df bhyveload: correctly query size of disks
On FreeBSD fstat(2) works fine for querying sizes of plain files,
but not so much for character devices.
So, use DIOCGMEDIASIZE to try to get the correct size for disks
and disk-like devices (e.g. zvols).

PR:		220186
Reviewed by:	tsoome, grehan
MFC after:	1 week
2017-06-21 18:19:27 +00:00
Enji Cooper
64a0982bee usr.sbin: normalize paths using SRCTOP-relative paths or :H when possible
This simplifies make logic/output

MFC after:	1 month
Sponsored by:	Dell EMC Isilon
2017-03-04 11:38:03 +00:00
Roman Bogorodskiy
6ee52c658c bhyve: improve memory size documentation
A couple of minor memory size option related nits:

 - use common name 'memsize' (instead of 'max-size' or just 'size')
 - bhyve: update usage with memsize unit suffix, drop legacy "MB"
   unit
 - bhyveload: update usage with memsize unit suffix
 - bhyve(8): document default size
 - bhyveload(8): use memsize formatting like it's done
   in bhyve(8)

Reviewed by:            wblock, grehan
Approved by:            re (kib), wblock, grehan
Differential Revision:  https://reviews.freebsd.org/D6952
2016-06-26 14:44:01 +00:00
Glen Barber
2263fb580e MFH
Sponsored by:	The FreeBSD Foundation
2016-04-06 01:44:21 +00:00
Pedro F. Giffuni
8f61276d40 bhyveload: fix from loading undefined size.
We were setting an incorrect/undefined size and as it came out the st
struct was not really being used at all. This was actually a bug but
by sheer luck it had no visual effect.

CID:		1194320
Reviewed by:	grehan
2016-04-06 00:01:03 +00:00
Glen Barber
52259a98ad MFH
Sponsored by:	The FreeBSD Foundation
2016-03-02 16:14:46 +00:00
Marcel Moolenaar
568e3a8d7f Add option -C to have the guest memory included in core files.
This aids in debugging OS loaders.
2016-02-26 16:15:02 +00:00
Marcel Moolenaar
48f337b82c Support version 4 of the userboot structure by implementing the
vm_set_register() and vm_set_desc() callbacks.
2016-02-26 16:12:20 +00:00
Glen Barber
b626f5a73a MFH r289384-r293170
Sponsored by:	The FreeBSD Foundation
2016-01-04 19:19:48 +00:00
Bryan Drewery
b1f92fa229 META MODE: Update dependencies with 'the-lot' and add missing directories.
This is not properly respecting WITHOUT or ARCH dependencies in target/.
Doing so requires a massive effort to rework targets/ to do so.  A
better approach will be to either include the SUBDIR Makefiles directly
and map to DIRDEPS or just dynamically lookup the SUBDIR.  These lose
the benefit of having a userland/lib, userland/libexec, etc, though and
results in a massive package.  The current implementation of targets/ is
very unmaintainable.

Currently rescue/rescue and sys/modules are still not connected.

Sponsored by:	EMC / Isilon Storage Division
2015-12-01 05:23:19 +00:00
Baptiste Daroussin
9be27fdc00 Merge from head 2015-10-09 22:45:54 +00:00
Marcel Moolenaar
8c96dcc166 Add option -l for specifying which OS loader to dlopen(3). By default
this is /boot/userboot.so. This option allows for the development and
use of other OS loaders.
2015-10-08 02:28:22 +00:00
Baptiste Daroussin
b5ff185e19 Merge from head 2015-09-12 11:41:31 +00:00
Neel Natu
f429b905b8 Fix issues detected by 'mandoc -Tlint bhyveload.8'
Pointed out by:		wblock
Differential Revision:	https://reviews.freebsd.org/D2762
2015-06-27 18:24:23 +00:00
Baptiste Daroussin
2fbd60ec47 Merge from head @274131 2015-06-20 00:58:46 +00:00
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
Glen Barber
37a48d408f MFH: r282615-r283655
Sponsored by:	The FreeBSD Foundation
2015-05-28 17:06:50 +00:00
Allan Jude
0db293c171 Fix off-by-one in array index bounds check
bhyveload would allow you to create 33 entries on an array that only has 32 slots

Differential Revision:	https://reviews.freebsd.org/D2569
Reviewed by:	araujo
Approved by:	neel
MFC after:	1 week
Sponsored by:	ScaleEngine Inc.
2015-05-18 19:45:46 +00:00
Baptiste Daroussin
7757a1b4dc Merge from head 2015-05-03 19:30:11 +00:00
Baptiste Daroussin
ea4a4d8a2e Fix overlinking in bhyve:
libvmmapi is actually needed to be linked to libutil, not bhyve nor bhyveload
2015-04-09 21:38:40 +00:00
Baptiste Daroussin
c2e2d02cbe Make FreeBSD-bhyve an indivual package 2015-03-05 07:30:48 +00:00
Baptiste Daroussin
c6db8143ed Convert usr.sbin to LIBADD
Reduce overlinking
2014-11-25 16:57:27 +00:00
John Baldwin
cde1f5b8a0 Sort command flags in usage output and the manpages. 2014-06-27 15:20:34 +00:00
Neel Natu
be679db4cd Provide APIs to directly get 'lowmem' and 'highmem' size directly.
Previously the sizes were inferred indirectly based on the size of the mappings
at 0 and 4GB respectively. This works fine as long as size of the allocation is
identical to the size of the mapping in the guest's address space. However, if
the mapping is disjoint then this assumption falls apart (e.g., due to the
legacy BIOS hole between 640KB and 1MB).
2014-06-24 02:02:51 +00:00
Baptiste Daroussin
01c2b8ac0d use .Mt to mark up email addresses consistently (part2)
PR:		191174
Submitted by:	Franco Fichtner  <franco@lastsummer.de>
2014-06-20 09:57:27 +00:00
Neel Natu
5fcf252f41 Add ioctl(VM_REINIT) to reinitialize the virtual machine state maintained
by vmm.ko. This allows the virtual machine to be restarted without having
to destroy it first.

Reviewed by:	grehan
2014-06-07 21:36:52 +00:00
Peter Grehan
cf087c12c2 ZFS boot support for bhyveload.
Modelled after the i386 zfsloader. However, with no
2nd stage zfsboot to search for a bootable dataset,
attempt a ZFS boot if there is more than one ZFS
dataset found during the disk probe.

sys/boot/userboot/zfs
 - build the ZFS boot library

sys/boot/userboot/userboot/
 conf.c
  - Add the ZFS pool and filesystem tables
 devicename.c
  - correctly format ZFS devices
 main.c
  - increase the size of the libstand malloc pool
  to account for the increased usage from ZFS buffers
  - probe for a ZFS dataset, and if one is
  found, attempt to boot from it.

usr.sbin/bhyveload/bhyveload.c
 - allow multiple invocations of the '-d' option
 to specify multiple disks e.g. a raidz set.
 Up to 32 disks are supported.

Tested with various combinations of GPT, MBR, single
and multiple disks, RAID-Z, mirrors.

Reviewed by:	neel
Discussed with:	avg
Tested by:	Michael Dexter and others
MFC after:	3 weeks
2014-02-22 07:18:06 +00:00
John Baldwin
00f3efe1bd Add support for FreeBSD/i386 guests under bhyve.
- Similar to the hack for bootinfo32.c in userboot, define
  _MACHINE_ELF_WANT_32BIT in the load_elf32 file handlers in userboot.
  This allows userboot to load 32-bit kernels and modules.
- Copy the SMAP generation code out of bootinfo64.c and into its own
  file so it can be shared with bootinfo32.c to pass an SMAP to the i386
  kernel.
- Use uint32_t instead of u_long when aligning module metadata in
  bootinfo32.c in userboot, as otherwise the metadata used 64-bit
  alignment which corrupted the layout.
- Populate the basemem and extmem members of the bootinfo struct passed
  to 32-bit kernels.
- Fix the 32-bit stack in userboot to start at the top of the stack
  instead of the bottom so that there is room to grow before the
  kernel switches to its own stack.
- Push a fake return address onto the 32-bit stack in addition to the
  arguments normally passed to exec() in the loader.  This return
  address is needed to convince recover_bootinfo() in the 32-bit
  locore code that it is being invoked from a "new" boot block.
- Add a routine to libvmmapi to setup a 32-bit flat mode register state
  including a GDT and TSS that is able to start the i386 kernel and
  update bhyveload to use it when booting an i386 kernel.
- Use the guest register state to determine the CPU's current instruction
  mode (32-bit vs 64-bit) and paging mode (flat, 32-bit, PAE, or long
  mode) in the instruction emulation code.  Update the gla2gpa() routine
  used when fetching instructions to handle flat mode, 32-bit paging, and
  PAE paging in addition to long mode paging.  Don't look for a REX
  prefix when the CPU is in 32-bit mode, and use the detected mode to
  enable the existing 32-bit mode code when decoding the mod r/m byte.

Reviewed by:	grehan, neel
MFC after:	1 month
2014-02-05 04:39:03 +00:00
Maxim Konovalov
b540294a53 o Fix typo, sort .Xrs.
PR:		docs/186191
Submitted by:	Andrew (typo fix)
MFC after:	1 week
2014-01-28 12:26:38 +00:00
Joel Dahl
0947c55b71 mdoc: quote string properly. 2013-12-02 19:49:52 +00:00
Peter Grehan
384305ff48 Don't create an initial value for the host filesystem of "/".
This has the unintended effect of booting the host kernel if
a disk image open fails.

Discussed with:	neel
2013-11-27 06:07:03 +00:00
Peter Grehan
6380102c7f Allow bhyve and bhyveload to attach to tty devices.
bhyveload: introduce the -c <device> parameter
 to select a tty for output (or "stdio")

bhyve: allow the puc and lpc-com backends to
 accept a tty in addition to "stdio"

When used in conjunction with the null-modem device,
nmdm(4), this allows attach/detach to the guest console
and multiple concurrent serial ports. kgdb on a serial
port is now functional.

Reviewed by:	neel
Requested by:	Almost everyone that has used bhyve
MFC after:	10.0
2013-11-27 00:21:37 +00:00
Neel Natu
b5331f4d88 Tidy usage messages for bhyve and bhyveload.
Submitted by:	jhb
2013-10-23 21:42:53 +00:00
Neel Natu
b6afa84b8c Add an option to bhyveload(8) that allows setting a loader environment variable
from the command line.

The option syntax is "-e <name=value>". It may be used multiple times to set
multiple environment variables.

Reviewed by:	grehan
Requested by:	alfred
2013-10-17 00:28:35 +00:00
Joel Dahl
5239e66cc2 Fix missing .
Approved by:	re (blanket)
2013-10-09 20:00:04 +00:00
Neel Natu
200758f114 Parse the memory size parameter using expand_number() to allow specifying
the memory size more intuitively (e.g. 512M, 4G etc).

Submitted by:	rodrigc
Reviewed by:	grehan
Approved by:	re (blanket)
2013-10-09 03:56:07 +00:00
Neel Natu
318224bbe6 Merge projects/bhyve_npt_pmap into head.
Make the amd64/pmap code aware of nested page table mappings used by bhyve
guests. This allows bhyve to associate each guest with its own vmspace and
deal with nested page faults in the context of that vmspace. This also
enables features like accessed/dirty bit tracking, swapping to disk and
transparent superpage promotions of guest memory.

Guest vmspace:
Each bhyve guest has a unique vmspace to represent the physical memory
allocated to the guest. Each memory segment allocated by the guest is
mapped into the guest's address space via the 'vmspace->vm_map' and is
backed by an object of type OBJT_DEFAULT.

pmap types:
The amd64/pmap now understands two types of pmaps: PT_X86 and PT_EPT.

The PT_X86 pmap type is used by the vmspace associated with the host kernel
as well as user processes executing on the host. The PT_EPT pmap is used by
the vmspace associated with a bhyve guest.

Page Table Entries:
The EPT page table entries as mostly similar in functionality to regular
page table entries although there are some differences in terms of what
bits are used to express that functionality. For e.g. the dirty bit is
represented by bit 9 in the nested PTE as opposed to bit 6 in the regular
x86 PTE. Therefore the bitmask representing the dirty bit is now computed
at runtime based on the type of the pmap. Thus PG_M that was previously a
macro now becomes a local variable that is initialized at runtime using
'pmap_modified_bit(pmap)'.

An additional wrinkle associated with EPT mappings is that older Intel
processors don't have hardware support for tracking accessed/dirty bits in
the PTE. This means that the amd64/pmap code needs to emulate these bits to
provide proper accounting to the VM subsystem. This is achieved by using
the following mapping for EPT entries that need emulation of A/D bits:
               Bit Position           Interpreted By
PG_V               52                 software (accessed bit emulation handler)
PG_RW              53                 software (dirty bit emulation handler)
PG_A               0                  hardware (aka EPT_PG_RD)
PG_M               1                  hardware (aka EPT_PG_WR)

The idea to use the mapping listed above for A/D bit emulation came from
Alan Cox (alc@).

The final difference with respect to x86 PTEs is that some EPT implementations
do not support superpage mappings. This is recorded in the 'pm_flags' field
of the pmap.

TLB invalidation:
The amd64/pmap code has a number of ways to do invalidation of mappings
that may be cached in the TLB: single page, multiple pages in a range or the
entire TLB. All of these funnel into a single EPT invalidation routine called
'pmap_invalidate_ept()'. This routine bumps up the EPT generation number and
sends an IPI to the host cpus that are executing the guest's vcpus. On a
subsequent entry into the guest it will detect that the EPT has changed and
invalidate the mappings from the TLB.

Guest memory access:
Since the guest memory is no longer wired we need to hold the host physical
page that backs the guest physical page before we can access it. The helper
functions 'vm_gpa_hold()/vm_gpa_release()' are available for this purpose.

PCI passthru:
Guest's with PCI passthru devices will wire the entire guest physical address
space. The MMIO BAR associated with the passthru device is backed by a
vm_object of type OBJT_SG. An IOMMU domain is created only for guest's that
have one or more PCI passthru devices attached to them.

Limitations:
There isn't a way to map a guest physical page without execute permissions.
This is because the amd64/pmap code interprets the guest physical mappings as
user mappings since they are numerically below VM_MAXUSER_ADDRESS. Since PG_U
shares the same bit position as EPT_PG_EXECUTE all guest mappings become
automatically executable.

Thanks to Alan Cox and Konstantin Belousov for their rigorous code reviews
as well as their support and encouragement.

Thanks for John Baldwin for reviewing the use of OBJT_SG as the backing
object for pci passthru mmio regions.

Special thanks to Peter Holm for testing the patch on short notice.

Approved by:	re
Discussed with:	grehan
Reviewed by:	alc, kib
Tested by:	pho
2013-10-05 21:22:35 +00:00
Joel Dahl
f11731eba1 mdoc: remove superfluous paragraph macro. 2013-03-19 07:25:58 +00:00
Neel Natu
b060ba5024 Simplify the assignment of memory to virtual machines by requiring a single
command line option "-m <memsize in MB>" to specify the memory size.

Prior to this change the user needed to explicitly specify the amount of
memory allocated below 4G (-m <lowmem>) and the amount above 4G (-M <highmem>).

The "-M" option is no longer supported by 'bhyveload' and 'bhyve'.

The start of the PCI hole is fixed at 3GB and cannot be directly changed
using command line options. However it is still possible to change this in
special circumstances via the 'vm_set_lowmem_limit()' API provided by
libvmmapi.

Submitted by:	Dinakar Medavaram (initial version)
Reviewed by:	grehan
Obtained from:	NetApp
2013-03-18 22:38:30 +00:00
Joel Dahl
bf77e2dbfc Remove EOL whitespace. 2013-01-19 07:07:05 +00:00
Joel Dahl
edccda4d08 Minor mdoc fixes. 2013-01-19 07:04:30 +00:00
Neel Natu
83994ddc7c Add the 'bhyveload(8)' man page.
Obtained from:	NetApp
Reviewed by:	grehan
2013-01-08 06:00:32 +00:00
Neel Natu
e37bc32183 Reduce the default memory allocation for a VM from 768MB to 128MB.
Obtained from:	NetApp
2013-01-08 01:56:05 +00:00