04 Dec, 2014
2 commits
-
Introduce support for new hypercall GNTTABOP_cache_flush.
Use it to perform cache flashing on pages used for dma when necessary.If GNTTABOP_cache_flush is supported by the hypervisor, we don't need to
bounce dma map operations that involve foreign grants and non-coherent
devices.Signed-off-by: Stefano Stabellini
Reviewed-by: Catalin Marinas
Acked-by: Ian Campbell -
The feature has been removed from Xen. Also Linux cannot use it on ARM32
without CONFIG_ARM_LPAE.Signed-off-by: Stefano Stabellini
Acked-by: Ian Campbell
Reviewed-by: David Vrabel
Reviewed-by: Catalin Marinas
06 Oct, 2014
1 commit
-
The DEFINE_XENBUS_DRIVER() macro looks a bit weird and causes sparse
errors.Replace the uses with standard structure definitions instead. This is
similar to pci and usb device registration.Signed-off-by: David Vrabel
03 Oct, 2014
1 commit
-
To be able to use an initially unmapped initrd with xen the following
header files must be synced to a newer version from the xen tree:include/xen/interface/elfnote.h
include/xen/interface/xen.hAs the KEXEC and DUMPCORE related ELFNOTES are not relevant for the
kernel they are omitted from elfnote.h.Signed-off-by: Juergen Gross
Signed-off-by: David Vrabel
23 Sep, 2014
2 commits
-
Add the definition of pvSCSI protocol used between the pvSCSI frontend
in a XEN domU and the pvSCSI backend in a XEN driver domain (usually
Dom0).This header was originally provided by Fujitsu for Xen based on Linux
2.6.18. Changes are:
- Added comments.
- Adapt to Linux style guide.
- Add support for larger SG-lists by putting them in an own granted
page.
- Remove stale definitions.Signed-off-by: Juergen Gross
Signed-off-by: David Vrabel -
Export bind_interdomain_evtchn_to_irq() so drivers can use threaded
interrupt handlers with:irq = bind_interdomain_evtchn_to_irq(remote_dom, remote_port);
if (irq < 0)
/* error */
ret = request_threaded_irq(...);Signed-off-by: Juergen Gross
Acked-by: Konrad Rzeszutek Wilk
Signed-off-by: David Vrabel
12 Sep, 2014
1 commit
-
The flag tells us that the hypervisor maps a grant page to guest
physical address == machine address of the page in addition to the
normal grant mapping address. It is needed to properly issue cache
maintenance operation at the completion of a DMA operation involving a
foreign grant.Signed-off-by: Stefano Stabellini
Tested-by: Denis Schneider
08 Aug, 2014
1 commit
-
Pull Xen updates from David Vrabel:
- remove unused V2 grant table support
- note that Konrad is xen-blkkback/front maintainer
- add 'xen_nopv' option to disable PV extentions for x86 HVM guests
- misc minor cleanups* tag 'stable/for-linus-3.17-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen-pciback: Document the 'quirks' sysfs file
xen/pciback: Fix error return code in xen_pcibk_attach()
xen/events: drop negativity check of unsigned parameter
xen/setup: Remove Identity Map Debug Message
xen/events/fifo: remove a unecessary use of BM()
xen/events/fifo: ensure all bitops are properly aligned even on x86
xen/events/fifo: reset control block and local HEADs on resume
xen/arm: use BUG_ON
xen/grant-table: remove support for V2 tables
x86/xen: safely map and unmap grant frames when in atomic context
MAINTAINERS: Make me the Xen block subsystem (front and back) maintainer
xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests.
05 Aug, 2014
1 commit
-
Pull EFI changes from Ingo Molnar:
"Main changes in this cycle are:- arm64 efi stub fixes, preservation of FP/SIMD registers across
firmware calls, and conversion of the EFI stub code into a static
library - Ard Biesheuvel- Xen EFI support - Daniel Kiper
- Support for autoloading the efivars driver - Lee, Chun-Yi
- Use the PE/COFF headers in the x86 EFI boot stub to request that
the stub be loaded with CONFIG_PHYSICAL_ALIGN alignment - Michael
Brown- Consolidate all the x86 EFI quirks into one file - Saurabh Tangri
- Additional error logging in x86 EFI boot stub - Ulf Winkelvos
- Support loading initrd above 4G in EFI boot stub - Yinghai Lu
- EFI reboot patches for ACPI hardware reduced platforms"
* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (31 commits)
efi/arm64: Handle missing virtual mapping for UEFI System Table
arch/x86/xen: Silence compiler warnings
xen: Silence compiler warnings
x86/efi: Request desired alignment via the PE/COFF headers
x86/efi: Add better error logging to EFI boot stub
efi: Autoload efivars
efi: Update stale locking comment for struct efivars
arch/x86: Remove efi_set_rtc_mmss()
arch/x86: Replace plain strings with constants
xen: Put EFI machinery in place
xen: Define EFI related stuff
arch/x86: Remove redundant set_bit(EFI_MEMMAP) call
arch/x86: Remove redundant set_bit(EFI_SYSTEM_TABLES) call
efi: Introduce EFI_PARAVIRT flag
arch/x86: Do not access EFI memory map if it is not available
efi: Use early_mem*() instead of early_io*()
arch/ia64: Define early_memunmap()
x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag
efi/reboot: Allow powering off machines using EFI
efi/reboot: Add generic wrapper around EfiResetSystem()
...
31 Jul, 2014
1 commit
-
Pull Xen fix from David Vrabel:
"Fix BUG when trying to expand the grant table. This seems to occur
often during boot with Ubuntu 14.04 PV guests"* tag 'stable/for-linus-3.16-rc7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
x86/xen: safely map and unmap grant frames when in atomic context
30 Jul, 2014
1 commit
-
arch_gnttab_map_frames() and arch_gnttab_unmap_frames() are called in
atomic context but were calling alloc_vm_area() which might sleep.Also, if a driver attempts to allocate a grant ref from an interrupt
and the table needs expanding, then the CPU may already by in lazy MMU
mode and apply_to_page_range() will BUG when it tries to re-enable
lazy MMU mode.These two functions are only used in PV guests.
Introduce arch_gnttab_init() to allocates the virtual address space in
advance.Avoid the use of apply_to_page_range() by using saving and using the
array of PTE addresses from the alloc_vm_area() call (which ensures
that the required page tables are pre-allocated).Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk
19 Jul, 2014
3 commits
-
Add inline keyword to silence the following compiler
warnings if xen_efi_probe() is not used:CC arch/x86/xen/setup.o
In file included from arch/x86/xen/xen-ops.h:7:0,
from arch/x86/xen/setup.c:31:
include/xen/xen-ops.h:43:35: warning: ‘xen_efi_probe’ defined but not used [-Wunused-function]Signed-off-by: Daniel Kiper
Reviewed-by: Konrad Rzeszutek Wilk
Signed-off-by: Matt Fleming -
This patch enables EFI usage under Xen dom0. Standard EFI Linux
Kernel infrastructure cannot be used because it requires direct
access to EFI data and code. However, in dom0 case it is not possible
because above mentioned EFI stuff is fully owned and controlled
by Xen hypervisor. In this case all calls from dom0 to EFI must
be requested via special hypercall which in turn executes relevant
EFI code in behalf of dom0.When dom0 kernel boots it checks for EFI availability on a machine.
If it is detected then artificial EFI system table is filled.
Native EFI callas are replaced by functions which mimics them
by calling relevant hypercall. Later pointer to EFI system table
is passed to standard EFI machinery and it continues EFI subsystem
initialization taking into account that there is no direct access
to EFI boot services, runtime, tables, structures, etc. After that
system runs as usual.This patch is based on Jan Beulich and Tang Liang work.
Signed-off-by: Jan Beulich
Signed-off-by: Tang Liang
Signed-off-by: Daniel Kiper
Reviewed-by: David Vrabel
Acked-by: Stefano Stabellini -
Define constants and structures which are needed to properly
execute EFI related hypercall in Xen dom0.This patch is based on Jan Beulich and Tang Liang work.
Signed-off-by: Jan Beulich
Signed-off-by: Tang Liang
Signed-off-by: Daniel Kiper
Reviewed-by: David Vrabel
Acked-by: Stefano Stabellini
Signed-off-by: Matt Fleming
15 Jul, 2014
2 commits
-
Since 11c7ff17c9b6dbf3a4e4f36be30ad531a6cf0ec9 (xen/grant-table: Force
to use v1 of grants.) the code for V2 grant tables is not used.Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk -
arch_gnttab_map_frames() and arch_gnttab_unmap_frames() are called in
atomic context but were calling alloc_vm_area() which might sleep.Also, if a driver attempts to allocate a grant ref from an interrupt
and the table needs expanding, then the CPU may already by in lazy MMU
mode and apply_to_page_range() will BUG when it tries to re-enable
lazy MMU mode.These two functions are only used in PV guests.
Introduce arch_gnttab_init() to allocates the virtual address space in
advance.Avoid the use of apply_to_page_range() by using saving and using the
array of PTE addresses from the alloc_vm_area() call.N.B. 'alloc_vm_area' pre-allocates the pagetable so there is no need
to worry about having to do a PGD/PUD/PMD walk (like apply_to_page_range
does) and we can instead do set_pte.Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk
----
[v2: Add comment about alloc_vm_area]
[v3: Fix compile error found by 0-day bot]
13 Jun, 2014
1 commit
-
Pull networking updates from David Miller:
1) Seccomp BPF filters can now be JIT'd, from Alexei Starovoitov.
2) Multiqueue support in xen-netback and xen-netfront, from Andrew J
Benniston.3) Allow tweaking of aggregation settings in cdc_ncm driver, from Bjørn
Mork.4) BPF now has a "random" opcode, from Chema Gonzalez.
5) Add more BPF documentation and improve test framework, from Daniel
Borkmann.6) Support TCP fastopen over ipv6, from Daniel Lee.
7) Add software TSO helper functions and use them to support software
TSO in mvneta and mv643xx_eth drivers. From Ezequiel Garcia.8) Support software TSO in fec driver too, from Nimrod Andy.
9) Add Broadcom SYSTEMPORT driver, from Florian Fainelli.
10) Handle broadcasts more gracefully over macvlan when there are large
numbers of interfaces configured, from Herbert Xu.11) Allow more control over fwmark used for non-socket based responses,
from Lorenzo Colitti.12) Do TCP congestion window limiting based upon measurements, from Neal
Cardwell.13) Support busy polling in SCTP, from Neal Horman.
14) Allow RSS key to be configured via ethtool, from Venkata Duvvuru.
15) Bridge promisc mode handling improvements from Vlad Yasevich.
16) Don't use inetpeer entries to implement ID generation any more, it
performs poorly, from Eric Dumazet.* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1522 commits)
rtnetlink: fix userspace API breakage for iproute2 < v3.9.0
tcp: fixing TLP's FIN recovery
net: fec: Add software TSO support
net: fec: Add Scatter/gather support
net: fec: Increase buffer descriptor entry number
net: fec: Factorize feature setting
net: fec: Enable IP header hardware checksum
net: fec: Factorize the .xmit transmit function
bridge: fix compile error when compiling without IPv6 support
bridge: fix smatch warning / potential null pointer dereference
via-rhine: fix full-duplex with autoneg disable
bnx2x: Enlarge the dorq threshold for VFs
bnx2x: Check for UNDI in uncommon branch
bnx2x: Fix 1G-baseT link
bnx2x: Fix link for KR with swapped polarity lane
sctp: Fix sk_ack_backlog wrap-around problem
net/core: Add VF link state control policy
net/fsl: xgmac_mdio is dependent on OF_MDIO
net/fsl: Make xgmac_mdio read error message useful
net_sched: drr: warn when qdisc is not work conserving
...
05 Jun, 2014
1 commit
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Document the multi-queue feature in terms of XenStore keys to be written
by the backend and by the frontend.Signed-off-by: Andrew J. Bennieston
Acked-by: Wei Liu
Acked-by: Ian Campbell
Reviewed-by: David Vrabel
Signed-off-by: David S. Miller
03 Jun, 2014
1 commit
-
Pull block driver changes from Jens Axboe:
"Now that the core bits are in, here's the pull request for the driver
related changes for 3.16. Nothing out of the ordinary here, mostly
business as usual. There are a few pulls of for-3.16/core into this
branch, which were done when the blk-mq was modified after the
mtip32xx conversion was put in.The pull request contains:
- skd and cciss converted to use pci_enable_msix_exact(). From
Alexander Gordeev.- A few mtip32xx fixes from Asai @ Micron.
- The conversion of mtip32xx from make_request_fn to blk-mq, and a
later small fix for that conversion on quiescing for non-queued IO.
From me.- A fix for bsg to use an exported function to check whether this
driver is request based or not. Needed updating for blk-mq, which
is request based, but does not have a request_fn hook. From me.- Small floppy bug fix from Jiri.
- A series of cleanups for the cdrom uniform layer from Joe Perches.
Gets rid of various old ugly macros, making the code conform more
to the modern coding style.- A series of patches for drbd from the drbd crew (Lars Ellenberg and
Philipp Reisner).- A use-after-free fix for null_blk from Ming Lei.
- Also from Ming Lei is a performance patch for virtio-blk, which can
net us a 3x win on kvm platforms where world notification is
expensive.- Ming Lei also fixed a stall issue in virtio-blk, due to a race
between queue start/stop and resource limits.- A small batch of fixes for xen-blk{back,front} from Olaf Hering and
Valentin Priescu"* 'for-3.16/drivers' of git://git.kernel.dk/linux-block: (54 commits)
block: virtio_blk: don't hold spin lock during world switch
xen-blkback: defer freeing blkif to avoid blocking xenwatch
xen blkif.h: fix comment typo in discard-alignment
xen/blkback: disable discard feature if requested by toolstack
xen-blkfront: remove type check from blkfront_setup_discard
floppy: do not corrupt bio.bi_flags when reading block 0
mtip32xx: move error handling to service thread
virtio_blk: fix race between start and stop queue
mtip32xx: stop block hardware queues before quiescing IO
mtip32xx: blk_mq_init_queue() returns an ERR_PTR
mtip32xx: convert to use blk-mq
cdrom: Remove unnecessary prototype for cdrom_get_disc_info
cdrom: Remove unnecessary prototype for cdrom_mrw_exit
cdrom: Remove cdrom_count_tracks prototype
cdrom: Remove cdrom_get_next_writeable prototype
cdrom: Remove cdrom_get_last_written prototype
cdrom: Move mmc_ioctls above cdrom_ioctl to remove unnecessary prototype
cdrom: Remove unnecessary sanitize_format prototype
cdrom: Remove unnecessary check_for_audio_disc prototype
cdrom: Remove prototype for open_for_data
...
29 May, 2014
1 commit
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Add the missing 'n' to discard-alignment
Signed-off-by: Olaf Hering
Signed-off-by: Konrad Rzeszutek Wilk
13 May, 2014
1 commit
-
New architectures currently have to provide implementations of 5 different
functions: xen_arch_pre_suspend(), xen_arch_post_suspend(),
xen_arch_hvm_post_suspend(), xen_mm_pin_all(), and xen_mm_unpin_all().Refactor the suspend code to only require xen_arch_pre_suspend() and
xen_arch_post_suspend().Signed-off-by: David Vrabel
Reviewed-by: Boris Ostrovsky
24 Apr, 2014
1 commit
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As part of this make the usual change to xen_ulong_t in place of unsigned long.
This change has no impact on x86.The Linux definition of struct multicall_entry.result differs from the Xen
definition, I think for good reasons, and used a long rather than an unsigned
long. Therefore introduce a xen_long_t, which is a long on x86 architectures
and a signed 64-bit integer on ARM.Use uint32_t nr_calls on x86 for consistency with the ARM definition.
Build tested on amd64 and i386 builds. Runtime tested on ARM.
Signed-off-by: Ian Campbell
Cc: Stefano Stabellini
Cc: Konrad Rzeszutek Wilk
Cc: Boris Ostrovsky
Signed-off-by: David Vrabel
18 Mar, 2014
2 commits
-
syscore->resume() callback is expected to do not enable interrupts,
it generates warning like below otherwise:[ 9386.365390] WARNING: CPU: 0 PID: 6733 at drivers/base/syscore.c:104 syscore_resume+0x9a/0xe0()
[ 9386.365403] Interrupts enabled after xen_acpi_processor_resume+0x0/0x34 [xen_acpi_processor]
...
[ 9386.365429] Call Trace:
[ 9386.365434] [] dump_stack+0x45/0x56
[ 9386.365437] [] warn_slowpath_common+0x7d/0xa0
[ 9386.365439] [] warn_slowpath_fmt+0x4c/0x50
[ 9386.365442] [] ? xen_upload_processor_pm_data+0x300/0x300 [xen_acpi_processor]
[ 9386.365443] [] syscore_resume+0x9a/0xe0
[ 9386.365445] [] suspend_devices_and_enter+0x402/0x470
[ 9386.365447] [] pm_suspend+0x178/0x260On xen_acpi_processor_resume() we call various procedures, which are
non atomic and can enable interrupts. To prevent the issue introduce
separate resume notify called after we enable interrupts on resume
and before we call other drivers resume callbacks.Signed-off-by: Stanislaw Gruszka
Signed-off-by: Konrad Rzeszutek Wilk -
Add support for MSI message groups for Xen Dom0 using the
MAP_PIRQ_TYPE_MULTI_MSI pirq map type.In order to keep track of which pirq is the first one in the group all
pirqs in the MSI group except for the first one have the newly
introduced PIRQ_MSI_GROUP flag set. This prevents calling
PHYSDEVOP_unmap_pirq on them, since the unmap must be done with the
first pirq in the group.Signed-off-by: Roger Pau Monné
Signed-off-by: David Vrabel
Cc: Boris Ostrovsky
01 Mar, 2014
2 commits
-
xenbus_bind_evtchn() has no callers so remove it.
Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk
Reviewed-by: Boris Ostrovsky -
resend_irq_on_evtchn() was only used by ia64 (which no longer has Xen
support).Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk
Reviewed-by: Boris Ostrovsky
15 Feb, 2014
1 commit
-
Pull block IO fixes from Jens Axboe:
"Second round of updates and fixes for 3.14-rc2. Most of this stuff
has been queued up for a while. The notable exception is the blk-mq
changes, which are naturally a bit more in flux still.The pull request contains:
- Two bug fixes for the new immutable vecs, causing crashes with raid
or swap. From Kent.- Various blk-mq tweaks and fixes from Christoph. A fix for
integrity bio's from Nic.- A few bcache fixes from Kent and Darrick Wong.
- xen-blk{front,back} fixes from David Vrabel, Matt Rushton, Nicolas
Swenson, and Roger Pau Monne.- Fix for a vec miscount with integrity vectors from Martin.
- Minor annotations or fixes from Masanari Iida and Rashika Kheria.
- Tweak to null_blk to do more normal FIFO processing of requests
from Shlomo Pongratz.- Elevator switching bypass fix from Tejun.
- Softlockup in blkdev_issue_discard() fix when !CONFIG_PREEMPT from
me"* 'for-linus' of git://git.kernel.dk/linux-block: (31 commits)
block: add cond_resched() to potentially long running ioctl discard loop
xen-blkback: init persistent_purge_work work_struct
blk-mq: pair blk_mq_start_request / blk_mq_requeue_request
blk-mq: dont assume rq->errors is set when returning an error from ->queue_rq
block: Fix cloning of discard/write same bios
block: Fix type mismatch in ssize_t_blk_mq_tag_sysfs_show
blk-mq: rework flush sequencing logic
null_blk: use blk_complete_request and blk_mq_complete_request
virtio_blk: use blk_mq_complete_request
blk-mq: rework I/O completions
fs: Add prototype declaration to appropriate header file include/linux/bio.h
fs: Mark function as static in fs/bio-integrity.c
block/null_blk: Fix completion processing from LIFO to FIFO
block: Explicitly handle discard/write same segments
block: Fix nr_vecs for inline integrity vectors
blk-mq: Add bio_integrity setup to blk_mq_make_request
blk-mq: initialize sg_reserved_size
blk-mq: handle dma_drain_size
blk-mq: divert __blk_put_request for MQ ops
blk-mq: support at_head inserations for blk_execute_rq
...
13 Feb, 2014
1 commit
-
Pull Xen bugfixes from Konrad Rzeszutek Wilk:
"This has an healthy amount of code being removed - which we do not use
anymore (the only user of it was ia64 Xen which had been removed
already). The other bug-fixes are to make Xen ARM be able to use the
new event channel mechanism and proper export of header files to
user-space.Summary:
- Fix ARM and Xen FIFO not working.
- Remove more Xen ia64 vestigates.
- Fix UAPI missing Xen files"* tag 'stable/for-linus-3.14-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
ia64/xen: Remove Xen support for ia64 even more
xen: install xen/gntdev.h and xen/gntalloc.h
xen/events: bind all new interdomain events to VCPU0
11 Feb, 2014
3 commits
-
Commit d52eefb47d4e ("ia64/xen: Remove Xen support for ia64") removed
the Kconfig symbol XEN_XENCOMM. But it didn't remove the code depending
on that symbol. Remove that code now.Signed-off-by: Paul Bolle
Acked-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk -
xen/gntdev.h and xen/gntalloc.h both provide userspace ABIs so they
should be installed.CC: stable@vger.kernel.org
Signed-off-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk -
…/git/xen/tip into for-linus
Konrad writes:
Please git pull the following branch:
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git stable/for-jens-3.14
which is based off v3.13-rc6. If you would like me to rebase it on
a different branch/tag I would be more than happy to do so.The patches are all bug-fixes and hopefully can go in 3.14.
They deal with xen-blkback shutdown and cause memory leaks
as well as shutdown races. They should go to stable tree and if you
are OK with I will ask them to backport those fixes.There is also a fix to xen-blkfront to deal with unexpected state
transition. And lastly a fix to the header where it was using the
__aligned__ unnecessarily.
08 Feb, 2014
1 commit
-
This was wrongly introduced in commit 402b27f9, the only difference
between blkif_request_segment_aligned and blkif_request_segment is
that the former has a named padding, while both share the same
memory layout.Also correct a few minor glitches in the description, including for it
to no longer assume PAGE_SIZE == 4096.Signed-off-by: Roger Pau Monné
[Description fix by Jan Beulich]
Signed-off-by: Jan Beulich
Reported-by: Jan Beulich
Cc: Konrad Rzeszutek Wilk
Cc: David Vrabel
Cc: Boris Ostrovsky
Tested-by: Matt Rushton
Cc: Matt Wilson
Signed-off-by: Konrad Rzeszutek Wilk
06 Feb, 2014
1 commit
-
Pull Xen fixes from Konrad Rzeszutek Wilk:
"Bug-fixes:
- Revert "xen/grant-table: Avoid m2p_override during mapping" as it
broke Xen ARM build.
- Fix CR4 not being set on AP processors in Xen PVH mode"* tag 'stable/for-linus-3.14-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/pvh: set CR4 flags for APs
Revert "xen/grant-table: Avoid m2p_override during mapping"
03 Feb, 2014
1 commit
-
This reverts commit 08ece5bb2312b4510b161a6ef6682f37f4eac8a1.
As it breaks ARM builds and needs more attention
on the ARM side.Acked-by: David Vrabel
Signed-off-by: Konrad Rzeszutek Wilk
01 Feb, 2014
1 commit
-
…inux/kernel/git/xen/tip
Pull Xen bugfixes from Konrad Rzeszutek Wilk:
"Bug-fixes for the new features that were added during this cycle.There are also two fixes for long-standing issues for which we have a
solution: grant-table operations extra work that was not needed
causing performance issues and the self balloon code was too
aggressive causing OOMs.Details:
- Xen ARM couldn't use the new FIFO events
- Xen ARM couldn't use the SWIOTLB if compiled as 32-bit with 64-bit PCIe devices.
- Grant table were doing needless M2P operations.
- Ratchet down the self-balloon code so it won't OOM.
- Fix misplaced kfree in Xen PVH error code paths"* tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/pvh: Fix misplaced kfree from xlated_setup_gnttab_pages
drivers: xen: deaggressive selfballoon driver
xen/grant-table: Avoid m2p_override during mapping
xen/gnttab: Use phys_addr_t to describe the grant frame base address
xen: swiotlb: handle sizeof(dma_addr_t) != sizeof(phys_addr_t)
arm/xen: Initialize event channels earlier
31 Jan, 2014
1 commit
-
The grant mapping API does m2p_override unnecessarily: only gntdev needs it,
for blkback and future netback patches it just cause a lock contention, as
those pages never go to userspace. Therefore this series does the following:
- the original functions were renamed to __gnttab_[un]map_refs, with a new
parameter m2p_override
- based on m2p_override either they follow the original behaviour, or just set
the private flag and call set_phys_to_machine
- gnttab_[un]map_refs are now a wrapper to call __gnttab_[un]map_refs with
m2p_override false
- a new function gnttab_[un]map_refs_userspace provides the old behaviourIt also removes a stray space from page.h and change ret to 0 if
XENFEAT_auto_translated_physmap, as that is the only possible return value
there.v2:
- move the storing of the old mfn in page->index to gnttab_map_refs
- move the function header update to a separate patchv3:
- a new approach to retain old behaviour where it needed
- squash the patches into onev4:
- move out the common bits from m2p* functions, and pass pfn/mfn as parameter
- clear page->private before doing anything with the page, so m2p_find_override
won't race with thisv5:
- change return value handling in __gnttab_[un]map_refs
- remove a stray space in page.h
- add detail why ret = 0 now at some placesv6:
- don't pass pfn to m2p* functions, just get it locallySigned-off-by: Zoltan Kiss
Suggested-by: David Vrabel
Acked-by: David Vrabel
Acked-by: Stefano Stabellini
Signed-off-by: Konrad Rzeszutek Wilk
30 Jan, 2014
1 commit
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On ARM, address size can be 32 bits or 64 bits (if CONFIG_ARCH_PHYS_ADDR_T_64BIT
is enabled).
We can't assume that the grant frame base address will always fits in an
unsigned long. Use phys_addr_t instead of unsigned long as argument for
gnttab_setup_auto_xlat_frames.Signed-off-by: Julien Grall
Signed-off-by: Stefano Stabellini
Acked-by: Ian Campbell
Reviewed-by: David Vrabel
23 Jan, 2014
1 commit
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Pull Xen updates from Konrad Rzeszutek Wilk:
"Two major features that Xen community is excited about:The first is event channel scalability by David Vrabel - we switch
over from an two-level per-cpu bitmap of events (IRQs) - to an FIFO
queue with priorities. This lets us be able to handle more events,
have lower latency, and better scalability. Good stuff.The other is PVH by Mukesh Rathor. In short, PV is a mode where the
kernel lets the hypervisor program page-tables, segments, etc. With
EPT/NPT capabilities in current processors, the overhead of doing this
in an HVM (Hardware Virtual Machine) container is much lower than the
hypervisor doing it for us.In short we let a PV guest run without doing page-table, segment,
syscall, etc updates through the hypervisor - instead it is all done
within the guest container. It is a "hybrid" PV - hence the 'PVH'
name - a PV guest within an HVM container.The major benefits are less code to deal with - for example we only
use one function from the the pv_mmu_ops (which has 39 function
calls); faster performance for syscall (no context switches into the
hypervisor); less traps on various operations; etc.It is still being baked - the ABI is not yet set in stone. But it is
pretty awesome and we are excited about it.Lastly, there are some changes to ARM code - you should get a simple
conflict which has been resolved in #linux-next.In short, this pull has awesome features.
Features:
- FIFO event channels. Key advantages: support for over 100,000
events (2^17), 16 different event priorities, improved fairness in
event latency through the use of FIFOs.
- Xen PVH support. "It’s a fully PV kernel mode, running with
paravirtualized disk and network, paravirtualized interrupts and
timers, no emulated devices of any kind (and thus no qemu), no BIOS
or legacy boot — but instead of requiring PV MMU, it uses the HVM
hardware extensions to virtualize the pagetables, as well as system
calls and other privileged operations." (from "The
Paravirtualization Spectrum, Part 2: From poles to a spectrum")Bug-fixes:
- Fixes in balloon driver (refactor and make it work under ARM)
- Allow xenfb to be used in HVM guests.
- Allow xen_platform_pci=0 to work properly.
- Refactors in event channels"* tag 'stable/for-linus-3.14-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (52 commits)
xen/pvh: Set X86_CR0_WP and others in CR0 (v2)
MAINTAINERS: add git repository for Xen
xen/pvh: Use 'depend' instead of 'select'.
xen: delete new instances of __cpuinit usage
xen/fb: allow xenfb initialization for hvm guests
xen/evtchn_fifo: fix error return code in evtchn_fifo_setup()
xen-platform: fix error return code in platform_pci_init()
xen/pvh: remove duplicated include from enlighten.c
xen/pvh: Fix compile issues with xen_pvh_domain()
xen: Use dev_is_pci() to check whether it is pci device
xen/grant-table: Force to use v1 of grants.
xen/pvh: Support ParaVirtualized Hardware extensions (v3).
xen/pvh: Piggyback on PVHVM XenBus.
xen/pvh: Piggyback on PVHVM for grant driver (v4)
xen/grant: Implement an grant frame array struct (v3).
xen/grant-table: Refactor gnttab_init
xen/grants: Remove gnttab_max_grant_frames dependency on gnttab_init.
xen/pvh: Piggyback on PVHVM for event channels (v2)
xen/pvh: Update E820 to work with PVH (v2)
xen/pvh: Secondary VCPU bringup (non-bootup CPUs)
...
21 Jan, 2014
1 commit
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Pull ia64 Xen removal from Tony Luck:
"Nobody has been maintaining xen in ia64 for a long time. Rip it all
out so people do not waste time making updates to broken/dead code"* tag 'please-pull-rm_xen' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
ia64/xen: Remove Xen support for ia64
06 Jan, 2014
1 commit
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PVH allows PV linux guest to utilize hardware extended capabilities,
such as running MMU updates in a HVM container.The Xen side defines PVH as (from docs/misc/pvh-readme.txt,
with modifications):"* the guest uses auto translate:
- p2m is managed by Xen
- pagetables are owned by the guest
- mmu_update hypercall not available
* it uses event callback and not vlapic emulation,
* IDT is native, so set_trap_table hcall is also N/A for a PVH guest.For a full list of hcalls supported for PVH, see pvh_hypercall64_table
in arch/x86/hvm/hvm.c in xen. From the ABI prespective, it's mostly a
PV guest with auto translate, although it does use hvm_op for setting
callback vector."Use .ascii and .asciz to define xen feature string. Note, the PVH
string must be in a single line (not multiple lines with \) to keep the
assembler from putting null char after each string before \.
This patch allows it to be configured and enabled.We also use introduce the 'XEN_ELFNOTE_SUPPORTED_FEATURES' ELF note to
tell the hypervisor that 'hvm_callback_vector' is what the kernel
needs. We can not put it in 'XEN_ELFNOTE_FEATURES' as older hypervisor
parse fields they don't understand as errors and refuse to load
the kernel. This work-around fixes the problem.Signed-off-by: Mukesh Rathor
Signed-off-by: Konrad Rzeszutek Wilk
Acked-by: Stefano Stabellini
