linux.git/arch/um/include, branch v5.14

Merge tag 'for-linus-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml

2021-07-09T17:19:13+00:00

Pull UML updates from Richard Weinberger:

 - Support for optimized routines based on the host CPU

 - Support for PCI via virtio

 - Various fixes

* tag 'for-linus-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml:
  um: remove unneeded semicolon in um_arch.c
  um: Remove the repeated declaration
  um: fix error return code in winch_tramp()
  um: fix error return code in slip_open()
  um: Fix stack pointer alignment
  um: implement flush_cache_vmap/flush_cache_vunmap
  um: add a UML specific futex implementation
  um: enable the use of optimized xor routines in UML
  um: Add support for host CPU flags and alignment
  um: allow not setting extra rpaths in the linux binary
  um: virtio/pci: enable suspend/resume
  um: add PCI over virtio emulation driver
  um: irqs: allow invoking time-travel handler multiple times
  um: time-travel/signals: fix ndelay() in interrupt
  um: expose time-travel mode to userspace side
  um: export signals_enabled directly
  um: remove unused smp_sigio_handler() declaration
  lib: add iomem emulation (logic_iomem)
  um: allow disabling NO_IOMEM

mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *

2021-07-08T18:48:22+00:00

No functional change in this patch.

[aneesh.kumar@linux.ibm.com: fix]
  Link: https://lkml.kernel.org/r/87wnqtnb60.fsf@linux.ibm.com
[sfr@canb.auug.org.au: another fix]
  Link: https://lkml.kernel.org/r/20210619134410.89559-1-aneesh.kumar@linux.ibm.com

Link: https://lkml.kernel.org/r/20210615110859.320299-1-aneesh.kumar@linux.ibm.com
Link: https://lore.kernel.org/linuxppc-dev/CAHk-=wi+J+iodze9FtjM3Zi4j4OeS+qqbKxME9QN4roxPEXH9Q@mail.gmail.com/
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Stephen Rothwell 
Cc: Christophe Leroy 
Cc: Hugh Dickins 
Cc: Joel Fernandes 
Cc: Kalesh Singh 
Cc: Kirill A. Shutemov 
Cc: Michael Ellerman 
Cc: Nicholas Piggin 
Cc: Stephen Rothwell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/thp: define default pmd_pgtable()

2021-07-01T18:06:03+00:00

Currently most platforms define pmd_pgtable() as pmd_page() duplicating
the same code all over.  Instead just define a default value i.e
pmd_page() for pmd_pgtable() and let platforms override when required via
.  All the existing platform that override pmd_pgtable()
have been moved into their respective  header in order to
precede before the new generic definition.  This makes it much cleaner
with reduced code.

Link: https://lkml.kernel.org/r/1623646133-20306-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual 
Acked-by: Geert Uytterhoeven 
Acked-by: Mike Rapoport 
Cc: Nick Hu 
Cc: Richard Henderson 
Cc: Vineet Gupta 
Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Guo Ren 
Cc: Brian Cain 
Cc: Geert Uytterhoeven 
Cc: Michal Simek 
Cc: Thomas Bogendoerfer 
Cc: Ley Foon Tan 
Cc: Jonas Bonn 
Cc: Stefan Kristiansson 
Cc: Stafford Horne 
Cc: "James E.J. Bottomley" 
Cc: Michael Ellerman 
Cc: Christophe Leroy 
Cc: Paul Walmsley 
Cc: Palmer Dabbelt 
Cc: Heiko Carstens 
Cc: Yoshinori Sato 
Cc: "David S. Miller" 
Cc: Jeff Dike 
Cc: Thomas Gleixner 
Cc: Chris Zankel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: define default value for FIRST_USER_ADDRESS

2021-07-01T18:06:02+00:00

Currently most platforms define FIRST_USER_ADDRESS as 0UL duplication the
same code all over.  Instead just define a generic default value (i.e 0UL)
for FIRST_USER_ADDRESS and let the platforms override when required.  This
makes it much cleaner with reduced code.

The default FIRST_USER_ADDRESS here would be skipped in 
when the given platform overrides its value via .

Link: https://lkml.kernel.org/r/1620615725-24623-1-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual 
Acked-by: Geert Uytterhoeven 	[m68k]
Acked-by: Guo Ren 			[csky]
Acked-by: Stafford Horne 		[openrisc]
Acked-by: Catalin Marinas 	[arm64]
Acked-by: Mike Rapoport 
Acked-by: Palmer Dabbelt 	[RISC-V]
Cc: Richard Henderson 
Cc: Vineet Gupta 
Cc: Catalin Marinas 
Cc: Will Deacon 
Cc: Guo Ren 
Cc: Brian Cain 
Cc: Geert Uytterhoeven 
Cc: Michal Simek 
Cc: Thomas Bogendoerfer 
Cc: Ley Foon Tan 
Cc: Jonas Bonn 
Cc: Stefan Kristiansson 
Cc: Stafford Horne 
Cc: "James E.J. Bottomley" 
Cc: Michael Ellerman 
Cc: Christophe Leroy 
Cc: Paul Walmsley 
Cc: Heiko Carstens 
Cc: Yoshinori Sato 
Cc: "David S. Miller" 
Cc: Jeff Dike 
Cc: Thomas Gleixner 
Cc: Chris Zankel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

um: Remove the repeated declaration

2021-06-17T20:11:52+00:00

Function 'os_flush_stdout' is declared twice, so remove the
repeated declaration.

Cc: Jeff Dike 
Cc: Richard Weinberger 
Signed-off-by: Shaokun Zhang 
Signed-off-by: Richard Weinberger

um: implement flush_cache_vmap/flush_cache_vunmap

2021-06-17T20:04:40+00:00

vmalloc() heavy workloads in UML are extremely slow, due to
flushing the entire kernel VM space (flush_tlb_kernel_vm())
on the first segfault.

Implement flush_cache_vmap() to avoid that, and while at it
also add flush_cache_vunmap() since it's trivial.

This speeds up my vmalloc() heavy test of copying files out
from /sys/kernel/debug/gcov/ by 30x (from 30s to 1s.)

Signed-off-by: Johannes Berg 
Acked-By: Anton Ivanov 
Signed-off-by: Richard Weinberger

um: add a UML specific futex implementation

2021-06-17T20:01:45+00:00

The generic asm futex implementation emulates atomic access to
memory by doing a get_user followed by put_user. These translate
to two mapping operations on UML with paging enabled in the
meantime. This, in turn may end up changing interrupts,
invoking the signal loop, etc.

This replaces the generic implementation by a mapping followed
by an operation on the mapped segment.

Signed-off-by: Anton Ivanov 
Signed-off-by: Richard Weinberger

um: enable the use of optimized xor routines in UML

2021-06-17T20:01:26+00:00

This patch enables the use of optimized xor routines from the x86
tree as well as the necessary fpu api shims so they can work on
UML.

Signed-off-by: Anton Ivanov 
Signed-off-by: Richard Weinberger

um: Add support for host CPU flags and alignment

2021-06-17T20:01:26+00:00

1. Reflect host cpu flags into the UML instance so they can
be used to select the correct implementations for xor, crypto, etc.

2. Reflect host cache alignment into UML instance. This is
important when running 32 bit on a 64 bit host as 32 bit by
default aligns to 32 while the actual alignment should be 64.
Ditto for some Xeons which align at 128.

Signed-off-by: Anton Ivanov 
Signed-off-by: Richard Weinberger

um: virtio/pci: enable suspend/resume

2021-06-17T19:45:44+00:00

The UM virtual PCI devices currently cannot be suspended properly
since the virtio driver already disables VQs well before the PCI
bus's suspend_noirq wants to complete the transition by writing to
PCI config space.

After trying around for a long time with moving the devices on the
DPM list, trying to create dependencies between them, etc. I gave
up and instead added UML specific cross-driver API that lets the
virt-pci code enable not suspending/resuming VQs for its devices.

This then allows the PCI bus suspend_noirq to still talk to the
device, and suspend/resume works properly.

Signed-off-by: Johannes Berg 
Signed-off-by: Richard Weinberger