Changes in Kconfig

f48212ee - treewide: remove CONFIG_HAVE_KVM

Thu, 04 Jan 2024 16:34:25 +0000

treewide: remove CONFIG_HAVE_KVMIt has no users anymore.Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

caadf876 - KVM: introduce CONFIG_KVM_COMMON

Thu, 04 Jan 2024 16:15:07 +0000

KVM: introduce CONFIG_KVM_COMMONCONFIG_HAVE_KVM is currently used by some architectures to eitherenabled the KVM config proper, or to enable host-side code that isnot part of the KVM module. However, CONFIG_KVM's "select" statementin virt/kvm/Kconfig corresponds to a third meaning, namely toenable common Kconfigs required by all architectures that supportKVM.These three meanings can be replaced respectively by anarchitecture-specific Kconfig, by IS_ENABLED(CONFIG_KVM), or bya new Kconfig symbol that is in turn selected by thearchitecture-specific "config KVM".Start by introducing such a new Kconfig symbol, CONFIG_KVM_COMMON.Unlike CONFIG_HAVE_KVM, it is selected by CONFIG_KVM, not byarchitecture code, and it brings in all dependencies of commonKVM code. In particular, INTERVAL_TREE was missing in loongarchand riscv, so that is another thing that is fixed.Fixes: 8132d887a702 ("KVM: remove CONFIG_HAVE_KVM_EVENTFD", 2023-12-08)Reported-by: Randy Dunlap Closes: https://lore.kernel.org/all/44907c6b-c5bd-4e4a-a921-e4d3825539d8@infradead.org/Reviewed-by: Andrew Jones Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

c5b31cc2 - KVM: remove CONFIG_HAVE_KVM_IRQFD

Wed, 18 Oct 2023 16:07:32 +0000

KVM: remove CONFIG_HAVE_KVM_IRQFDAll platforms with a kernel irqchip have support for irqfd. Unify thetwo configuration items so that userspace can expect to use irqfd toinject interrupts into the irqchip.Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

8132d887 - KVM: remove CONFIG_HAVE_KVM_EVENTFD

Wed, 18 Oct 2023 16:11:56 +0000

KVM: remove CONFIG_HAVE_KVM_EVENTFDvirt/kvm/eventfd.c is compiled unconditionally, meaning that the ioeventfdsmember of struct kvm is accessed unconditionally. CONFIG_HAVE_KVM_EVENTFDtherefore must be defined for KVM common code to compile successfully,remove it.Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

79cf833b - kvm: Remove "select SRCU"

Fri, 24 Mar 2023 20:52:47 +0000

kvm: Remove "select SRCU"Now that the SRCU Kconfig option is unconditionally selected, there isno longer any point in selecting it. Therefore, remove the "select SRCU"Kconfig statements from the various KVM Kconfig files.Acked-by: Sean Christopherson (x86)Signed-off-by: Paul E. McKenney Cc: Huacai Chen Cc: Aleksandar Markovic Cc: Thomas Bogendoerfer Cc: Michael Ellerman Cc: Christophe Leroy Cc: Sean Christopherson Cc: Paolo Bonzini Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Acked-by: Marc Zyngier (arm64)Acked-by: Michael Ellerman (powerpc)Acked-by: Anup Patel (riscv)Acked-by: Heiko Carstens (s390)Reviewed-by: John Ogness Signed-off-by: Joel Fernandes (Google) List of files: /linux-6.15/arch/s390/kvm/Kconfig

ca2fd060 - KVM: s390: pv: add mmu_notifier

Tue, 28 Jun 2022 13:56:10 +0000

KVM: s390: pv: add mmu_notifierAdd an mmu_notifier for protected VMs. The callback function istriggered when the mm is torn down, and will attempt to convert allprotected vCPUs to non-protected. This allows the mm teardown to usethe destroy page UVC instead of export.Also make KVM select CONFIG_MMU_NOTIFIER, needed to use mmu_notifiers.Signed-off-by: Claudio Imbrenda Acked-by: Janosch Frank Reviewed-by: Nico Boehr Link: https://lore.kernel.org/r/20220628135619.32410-10-imbrenda@linux.ibm.comMessage-Id: <20220628135619.32410-10-imbrenda@linux.ibm.com>[frankja@linux.ibm.com: Conflict resolution for mmu_notifier.h includeand struct kvm_s390_pv]Signed-off-by: Janosch Frank List of files: /linux-6.15/arch/s390/kvm/Kconfig

ed922739 - KVM: Use interval tree to do fast hva lookup in memslots

Mon, 06 Dec 2021 19:54:28 +0000

KVM: Use interval tree to do fast hva lookup in memslotsThe current memslots implementation only allows quick binary search by gfn,quick lookup by hva is not possible - the implementation has to do a linearscan of the whole memslots array, even though the operation being performedmight apply just to a single memslot.This significantly hurts performance of per-hva operations with highermemslot counts.Since hva ranges can overlap between memslots an interval tree is neededfor tracking them.[sean: handle interval tree updates in kvm_replace_memslot()]Signed-off-by: Maciej S. Szmigiero Message-Id: List of files: /linux-6.15/arch/s390/kvm/Kconfig

a7f7f624 - treewide: replace '---help---' in Kconfig files with 'help'

Sat, 13 Jun 2020 16:50:22 +0000

treewide: replace '---help---' in Kconfig files with 'help'Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over'---help---'"), the number of '---help---' has been graduallydecreasing, but there are still more than 2400 instances.This commit finishes the conversion. While I touched the lines,I also fixed the indentation.There are a variety of indentation styles found. a) 4 spaces + '---help---' b) 7 spaces + '---help---' c) 8 spaces + '---help---' d) 1 space + 1 tab + '---help---' e) 1 tab + '---help---' (correct indentation) f) 1 tab + 1 space + '---help---' g) 1 tab + 2 spaces + '---help---'In order to convert all of them to 1 tab + 'help', I ran thefollowing commend: $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/'Signed-off-by: Masahiro Yamada List of files: /linux-6.15/arch/s390/kvm/Kconfig

20c384f1 - vhost: refine vhost and vringh kconfig

Thu, 26 Mar 2020 14:01:17 +0000

vhost: refine vhost and vringh kconfigCurrently, CONFIG_VHOST depends on CONFIG_VIRTUALIZATION. But vhost isnot necessarily for VM since it's a generic userspace and kernelcommunication protocol. Such dependency may prevent archs withoutvirtualization support from using vhost.To solve this, a dedicated vhost menu is created under drivers soCONIFG_VHOST can be decoupled out of CONFIG_VIRTUALIZATION.While at it, also squash Kconfig.vringh into vhost Kconfig file. Thisavoids the trick of conditional inclusion from VOP or CAIF. Then itwill be easier to introduce new vringh users and common dependency forboth vringh and vhost.Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20200326140125.19794-2-jasowang@redhat.comSigned-off-by: Michael S. Tsirkin List of files: /linux-6.15/arch/s390/kvm/Kconfig

8b905d28 - KVM: s390: provide kvm_arch_no_poll function

Tue, 05 Mar 2019 10:30:02 +0000

KVM: s390: provide kvm_arch_no_poll functionWe do track the current steal time of the host CPUs. Let us usethis value to disable halt polling if the steal time goes beyonda configured value.Signed-off-by: Christian Borntraeger Acked-by: Paolo Bonzini Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger List of files: /linux-6.15/arch/s390/kvm/Kconfig

5dd50aae - Make anon_inodes unconditional

Mon, 05 Nov 2018 17:40:31 +0000

Make anon_inodes unconditionalMake the anon_inodes facility unconditional so that it can be used by coreVFS code and pidfd code.Signed-off-by: David Howells Signed-off-by: Al Viro [christian@brauner.io: adapt commit message to mention pidfds]Signed-off-by: Christian Brauner List of files: /linux-6.15/arch/s390/kvm/Kconfig

dadd2299 - Make anon_inodes unconditional

Mon, 05 Nov 2018 17:40:31 +0000

Make anon_inodes unconditionalMake the anon_inodes facility unconditional so that it can be used by coreVFS code.Signed-off-by: David Howells Signed-off-by: Al Viro List of files: /linux-6.15/arch/s390/kvm/Kconfig

8636a1f9 - treewide: surround Kconfig file paths with double quotes

Tue, 11 Dec 2018 11:01:04 +0000

treewide: surround Kconfig file paths with double quotesThe Kconfig lexer supports special characters such as '.' and '/' inthe parameter context. In my understanding, the reason is just tosupport bare file paths in the source statement.I do not see a good reason to complicate Kconfig for the room ofambiguity.The majority of code already surrounds file paths with double quotes,and it makes sense since file paths are constant string literals.Make it treewide consistent now.Signed-off-by: Masahiro Yamada Acked-by: Wolfram Sang Acked-by: Geert Uytterhoeven Acked-by: Ingo Molnar List of files: /linux-6.15/arch/s390/kvm/Kconfig

5cb0944c - KVM: introduce kvm_arch_vcpu_async_ioctl

Tue, 12 Dec 2017 16:41:34 +0000

KVM: introduce kvm_arch_vcpu_async_ioctlAfter the vcpu_load/vcpu_put pushdown, the handling of asynchronous VCPUioctl is already much clearer in that it is obvious that they bypassvcpu_load and vcpu_put.However, it is still not perfect in that the different state of the VCPUmutex is still hidden in the caller. Separate those ioctls into a newfunction kvm_arch_vcpu_async_ioctl that returns -ENOIOCTLCMD for more"traditional" synchronous ioctls.Cc: James Hogan Cc: Paul Mackerras Cc: Christian Borntraeger Reviewed-by: Christoffer Dall Reviewed-by: Cornelia Huck Suggested-by: Cornelia Huck Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

b2441318 - License cleanup: add SPDX GPL-2.0 license identifier to files with no license

Wed, 01 Nov 2017 14:07:57 +0000

License cleanup: add SPDX GPL-2.0 license identifier to files with no licenseMany source files in the tree are missing licensing information, whichmakes it harder for compliance tools to determine the correct license.By default all files without license information are under the defaultlicense of the kernel, which is GPL version 2.Update the files which contain no license information with the 'GPL-2.0'SPDX license identifier. The SPDX identifier is a legally bindingshorthand, which can be used instead of the full boiler plate text.This patch is based on work done by Thomas Gleixner and Kate Stewart andPhilippe Ombredanne.How this work was done:Patches were generated and checked against linux-4.14-rc6 for a subset ofthe use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information,Further patches will be generated in subsequent months to fix up caseswhere non-standard license headers were used, and references to licensehad to be inferred by heuristics based on keywords.The analysis to determine which SPDX License Identifier to be applied toa file was done in a spreadsheet of side by side results from of theoutput of two independent scanners (ScanCode & Windriver) producing SPDXtag:value files created by Philippe Ombredanne. Philippe prepared thebase worksheet, and did an initial spot review of a few 1000 files.The 4.13 kernel was the starting point of the analysis with 60,537 filesassessed. Kate Stewart did a file by file comparison of the scannerresults in the spreadsheet to determine which SPDX license identifier(s)to be applied to the file. She confirmed any determination that was notimmediately clear with lawyers working with the Linux Foundation.Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines).All documentation files were explicitly excluded.The following heuristics were used to determine which SPDX licenseidentifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time.In total, over 70 hours of logged manual review was done on thespreadsheet to determine the SPDX license identifiers to apply to thesource files by Kate, Philippe, Thomas and, in some cases, confirmationby lawyers working with the Linux Foundation.Kate also obtained a third independent scan of the 4.13 code base fromFOSSology, and compared selected files where the other two scannersdisagreed against that SPDX file, to see if there was new insights. TheWindriver scanner is based on an older version of FOSSology in part, sothey are related.Thomas did random spot checks in about 500 files from the spreadsheetsfor the uapi headers and agreed with SPDX license identifier in thefiles he inspected. For the non-uapi files Thomas did random spot checksin about 15000 files.In initial set of patches against 4.14-rc6, 3 files were found to havecopy/paste license identifier errors, and have been fixed to reflect thecorrect identifier.Additionally Philippe spent 10 hours this week doing a detailed manualinspection and review of the 12,461 patched files from the initial patchversion early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correctThis produced a worksheet with 20 files needing minor correction. Thisworksheet was then exported into 3 different .csv files for thedifferent types of files to be modified.These .csv files were then reviewed by Greg. Thomas wrote a script toparse the csv files and add the proper SPDX tag to the file, in theformat that the file expected. This script was further refined by Gregbased on the output to detect more types of files automatically and todistinguish between header and source .c files (which need differentcomment types.) Finally Greg ran the script using the .csv files togenerate the patches.Reviewed-by: Kate Stewart Reviewed-by: Philippe Ombredanne Reviewed-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman List of files: /linux-6.15/arch/s390/kvm/Kconfig

3491caf2 - KVM: halt_polling: provide a way to qualify wakeups during poll

Fri, 13 May 2016 10:16:35 +0000

KVM: halt_polling: provide a way to qualify wakeups during pollSome wakeups should not be considered a sucessful poll. For example ons390 I/O interrupts are usually floating, which means that _ALL_ CPUswould be considered runnable - letting all vCPUs poll all the time fortransactional like workload, even if one vCPU would be enough.This can result in huge CPU usage for large guests.This patch lets architectures provide a way to qualify wakeups if theyshould be considered a good/bad wakeups in regard to polls.For s390 the implementation will fence of halt polling for anything butknown good, single vCPU events. The s390 implementation for floatinginterrupts does a wakeup for one vCPU, but the interrupt will be deliveredby whatever CPU checks first for a pending interrupt. We prefer thewoken up CPU by marking the poll of this CPU as "good" poll.This code will also mark several other wakeup reasons like IPI orexpired timers as "good". This will of course also mark some events asnot sucessful. As KVM on z runs always as a 2nd level hypervisor,we prefer to not poll, unless we are really sure, though.This patch successfully limits the CPU usage for cases like uperf 1bytetransactional ping pong workload or wakeup heavy workload like OLTPwhile still providing a proper speedup.This also introduced a new vcpu stat "halt_poll_no_tuning" that markswakeups that are considered not good for polling.Signed-off-by: Christian Borntraeger Acked-by: Radim Krčmář (for an earlier version)Cc: David Matlack Cc: Wanpeng Li [Rename config symbol. - Paolo]Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

14b0b4ac - KVM: s390: Enable the KVM-VFIO device

Wed, 20 Jan 2016 05:33:42 +0000

KVM: s390: Enable the KVM-VFIO deviceThe KVM-VFIO device is used by the QEMU VFIO device. It is used torecord the list of in-use VFIO groups so that KVM can manipulatethem.While we don't need this on s390 currently, let's try to be likeeveryone else.Signed-off-by: Dong Jia Shi Acked-by: Cornelia Huck Signed-off-by: Christian Borntraeger List of files: /linux-6.15/arch/s390/kvm/Kconfig

83fe27ea - rcu: Make SRCU optional by using CONFIG_SRCU

Fri, 05 Dec 2014 16:24:45 +0000

rcu: Make SRCU optional by using CONFIG_SRCUSRCU is not necessary to be compiled by default in all cases. For tinificationefforts not compiling SRCU unless necessary is desirable.The current patch tries to make compiling SRCU optional by introducing a newKconfig option CONFIG_SRCU which is selected when any of the components makinguse of SRCU are selected.If we do not select CONFIG_SRCU, srcu.o will not be compiled at all. text data bss dec hex filename 2007 0 0 2007 7d7 kernel/rcu/srcu.oSize of arch/powerpc/boot/zImage changes from text data bss dec hex filename 831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before 829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : afterso the savings are about ~2000 bytes.Signed-off-by: Pranith Kumar CC: Paul E. McKenney CC: Josh Triplett CC: Lai Jiangshan Signed-off-by: Paul E. McKenney [ paulmck: resolve conflict due to removal of arch/ia64/kvm/Kconfig. ] List of files: /linux-6.15/arch/s390/kvm/Kconfig

297e2105 - KVM: Give IRQFD its own separate enabling Kconfig option

Mon, 30 Jun 2014 10:51:13 +0000

KVM: Give IRQFD its own separate enabling Kconfig optionCurrently, the IRQFD code is conditional on CONFIG_HAVE_KVM_IRQ_ROUTING.So that we can have the IRQFD code compiled in without having theIRQ routing code, this creates a new CONFIG_HAVE_KVM_IRQFD, makesthe IRQFD code conditional on it instead of CONFIG_HAVE_KVM_IRQ_ROUTING,and makes all the platforms that currently select HAVE_KVM_IRQ_ROUTINGalso select HAVE_KVM_IRQFD.Signed-off-by: Paul Mackerras Tested-by: Eric Auger Tested-by: Cornelia Huck Signed-off-by: Paolo Bonzini List of files: /linux-6.15/arch/s390/kvm/Kconfig

84223598 - KVM: s390: irq routing for adapter interrupts.

Mon, 15 Jul 2013 11:36:01 +0000

KVM: s390: irq routing for adapter interrupts.Introduce a new interrupt class for s390 adapter interrupts and enableirqfds for s390.This is depending on a new s390 specific vm capability, KVM_CAP_S390_IRQCHIP,that needs to be enabled by userspace.Acked-by: Christian Borntraeger Signed-off-by: Cornelia Huck List of files: /linux-6.15/arch/s390/kvm/Kconfig