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* Make shadow IDT a complete IDT with 256 entries.Rusty Russell2007-10-232-32/+20
| | | | | | | This simplifies the code a little, in preparation for allowing alternate system call vectors in guests (Plan 9 uses 0x40). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Remove fixed limit on number of guests, and lguests array.Rusty Russell2007-10-237-45/+14
| | | | | | | | | | | Back when we had all the Guest state in the switcher, we had a fixed array of them. This is no longer necessary. If we switch the network code to using random_ether_addr (46 bits is enough to avoid clashes), we can get rid of the concept of "guest id" altogether. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Introduce guest mem offset, static link example launcherRusty Russell2007-10-238-140/+163
| | | | | | | | | | | In order to avoid problematic special linking of the Launcher, we give the Host an offset: this means we can use any memory region in the Launcher as Guest memory rather than insisting on mmap() at 0. The result is quite pleasing: a number of casts are replaced with simple additions. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Accept elf files that are valid but have sections that can not be mmap'ed ↵Ronald G. Minnich2007-10-231-29/+32
| | | | | | | | | | for some reason. Plan9 kernel binaries don't neatly align their ELF sections to our page boundaries. Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Rename switcher.S to x86/switcher_32.SRusty Russell2007-10-232-3/+5
| | | | | | | | lguest uses a "switcher" shim mapped high to bounce between host and guest. As lguest becomes less i386-centric, we separate this code into a subdir. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Move lguest guest support to arch/x86.Rusty Russell2007-10-237-11/+17
| | | | | | | | | Lguest has two sides: host support (to launch guests) and guest support (replacement boot path and paravirt_ops). This moves the guest side to arch/x86/lguest where it's closer to related code. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de>
* Move lguest hcalls to arch-specific headerJes Sorensen2007-10-232-65/+71
| | | | | | | | | | | Move architecture specific portion of lg_hcall code to asm-i386/lg_hcall.h and have it included from linux/lguest.h. [Changed to asm-i386/lguest_hcall.h so documentation finds it -RR] Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Jes Sorensen <jes@sgi.com>
* Clocksource is continuous regardless of the state of the host's TSC.Tony Breeds2007-10-231-3/+2
| | | | | | | | | | | Currently lguest will spend a lot of of time waking up the host, as it cannot go tickless (if the [host] TSC has been marked unstable). On my laptop I was getting ~40% of wakeups from lguest. With this patch applied, my laptop is much happier! Signed-off-by: Tony Breeds <tony@bakeyournoodle.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest_devices belongs in lguest_bus.c: it's not i386-specific.Rusty Russell2007-10-232-1/+2
| | | | Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Make lguest_launcher.h types userspace-friendlyRusty Russell2007-10-233-13/+14
| | | | | | | | | lguest_launcher.h uses "u32" not "__u32", which sets a bad example. Fix that, and include <linux/types.h>. This means we need to use -I on the Launcher build line so types.h is found. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest.txt updateRusty Russell2007-10-231-39/+29
| | | | | | | | | | o Describe the new split configurations o Highlight code documentation in drivers/lguest/README o Point out necessity of having a getty on /dev/hvc0 o Remove gratuitous "m" in example o Don't discuss I/O model here, stick to user documentation. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Lguest currently depends on 32-bit x86, not just x86.Rusty Russell2007-10-231-1/+1
| | | | Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Use copy_to_user() not put_user for struct timespecJes Sorensen2007-10-231-1/+1
| | | | | | | | | | Use copy_to_user() when copying a struct timespec to the guest - put_user() cannot handle two long's in one go on a 64bit arch. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Jes Sorensen <jes@sgi.com> Cc: Al Viro <viro@ftp.linux.org.uk>
* turn err into errx in lguest call sitesGlauber de Oliveira Costa2007-10-231-2/+2
| | | | | | | | | These two callsites should really be errx instead of err, since there is no errno associated with them in the moment they are issued. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Glauber de Oliveira Costa <gcosta@redhat.com>
* Remove binfmts.h include from lg.hRusty Russell2007-10-231-1/+0
| | | | | | It wasn't needed since a very early prototype of lguest. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Make asm-x86/bootparam.h includable from userspace.Rusty Russell2007-10-2313-225/+229
| | | | | | | | | | | To actually write a bootloader (or, say, the lguest launcher) currently requires duplication of these structures. Making them includable from userspace is much nicer. We merge the common userspace-required definitions of e820_32/64.h into e820.h for export. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Consolidate host virtualization support under Virtualization menuRusty Russell2007-10-232-2/+4
| | | | | | | Move lguest under the virtualization menu. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Avi Kivity <avi@qumranet.com>
* Normalize config options for guest supportRusty Russell2007-10-233-14/+32
| | | | | | | | | | | | | 1) Group all the "guest OS" support options together, under a PARAVIRT_GUEST menu. 2) Make those options select CONFIG_PARAVIRT, as suggested by Andi. 3) Make kconfig help titles consistent. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Cc: Zach Amsden <zach@vmware.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Chris Wright <chrisw@sous-sol.org>
* procfs: fix kernel-doc param warningsRandy Dunlap2007-10-221-24/+22
| | | | | | | | | | | | Fix mnt_flush_task() misplaced kernel-doc. Fix typos in some of the doc text. Warning(linux-2.6.23-git17//fs/proc/base.c:2280): No description found for parameter 'mnt' Warning(linux-2.6.23-git17//fs/proc/base.c:2280): No description found for parameter 'pid' Warning(linux-2.6.23-git17//fs/proc/base.c:2280): No description found for parameter 'tgid' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* auditsc: fix kernel-doc param warningsRandy Dunlap2007-10-221-2/+2
| | | | | | | | | | Fix kernel-doc for auditsc parameter changes. Warning(linux-2.6.23-git17//kernel/auditsc.c:1623): No description found for parameter 'dentry' Warning(linux-2.6.23-git17//kernel/auditsc.c:1666): No description found for parameter 'dentry' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Expand hwif->host_flags so that it fits new flags.David Miller2007-10-221-1/+1
| | | | | | | | | | | Commit 238e4f142c33bb34440cc64029dde7b9fbc4e65f ("ide: add IDE_HFLAG_NO_LBA48 and IDE_HFLAG_NO_LBA48_DMA host flags") caused a regression because the host_flags in struct hwif_s wasn't expanded to cope with the fact that the host flags no longer fit in 16 bits. Signed-off-by: David S. Miller <davem@davemloft.net> [ I hate having to add good commit descriptions. - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2007-10-227-40/+89
|\ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: appletouch - apply idle reset logic to all touchpads Input: usbtouchscreen - add support for GoTop tablet devices Input: bf54x-keys - return real error when request_irq() fails Input: i8042 - export i8042_command()
| * Input: appletouch - apply idle reset logic to all touchpadsAnton Ekblad2007-10-221-14/+11
| | | | | | | | | | | | | | | | | | | | Not only Geyser 3 but also Geyser 1 need to be reset after they become idle to stop them from needlessly waking up the kernel. Do idle reset on all touchpads, regardless of their version - if we see 10 empty packets the touchpad needs to be reset; good touchpads should not send empty packets anyway. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * Input: usbtouchscreen - add support for GoTop tablet devicesJerrold Jones2007-10-222-2/+40
| | | | | | | | | | | | | | | | Add support for GoTop Super_Q2/GogoPen/PenPower tablets to usbtouchscreen. Protocol discovery was done by Yick Yan Lam. Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * Input: bf54x-keys - return real error when request_irq() failsMichael Hennerich2007-10-221-1/+0
| | | | | | | | | | | | Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * Input: i8042 - export i8042_command()Márton Németh2007-10-223-23/+38
| | | | | | | | | | | | | | | | | | Export the i8042_command() function which manages the mutual exclusion with the help of the i8042_lock spinlock. This allows to access i8042 safely from other parts of the kernel. Signed-off-by: Márton Németh <nm127@freemail.hu> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* | Merge branch 'for-linus' of ↵Linus Torvalds2007-10-222-4/+4
|\ \ | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6 * 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6: Blackfin arch: use KBUILD_CFLAGS and KBUILD_AFLAGS in Makefile Blackfin arch: Javier Herrer writes: fix building when icache and dcache is disabled
| * | Blackfin arch: use KBUILD_CFLAGS and KBUILD_AFLAGS in MakefileBryan Wu2007-10-221-2/+2
| | | | | | | | | | | | | | | Signed-off-by: Bryan Wu <bryan.wu@analog.com>
| * | Blackfin arch: Javier Herrer writes: fix building when icache and dcache is ↵Mike Frysinger2007-10-221-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | disabled Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
* | | Merge branch 'for-linus' of ↵Linus Torvalds2007-10-226-69/+103
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm: KVM: Use new smp_call_function_mask() in kvm_flush_remote_tlbs() sched: don't clear PF_VCPU in scheduler KVM: Improve local apic timer wraparound handling KVM: Fix local apic timer divide by zero KVM: Move kvm_guest_exit() after local_irq_enable() KVM: x86 emulator: fix access registers for instructions with ModR/M byte and Mod = 3 KVM: VMX: Force vm86 mode if setting flags during real mode KVM: x86 emulator: implement 'movnti mem, reg' KVM: VMX: Reset mmu context when entering real mode KVM: VMX: Handle NMIs before enabling interrupts and preemption KVM: MMU: Set shadow pte atomically in mmu_pte_write_zap_pte() KVM: x86 emulator: fix repne/repnz decoding KVM: x86 emulator: fix merge screwup due to emulator split
| * | | KVM: Use new smp_call_function_mask() in kvm_flush_remote_tlbs()Laurent Vivier2007-10-221-23/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In kvm_flush_remote_tlbs(), replace a loop using smp_call_function_single() by a single call to smp_call_function_mask() (which is new for x86_64). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | sched: don't clear PF_VCPU in schedulerLaurent Vivier2007-10-221-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | KVM clears it by itself now, and for s390 this is plain wrong. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: Improve local apic timer wraparound handlingKevin Pedretti2007-10-221-10/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Better handle wrap-around cases when reading the APIC CCR (current count register). Also, if ICR is 0, CCR should also be 0... previously reading CCR before setting ICR would result in a large kinda-random number. Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: Fix local apic timer divide by zeroKevin Pedretti2007-10-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kvm_lapic_reset() was initializing apic->timer.divide_count to 0, which could potentially lead to a divide by zero error in apic_get_tmcct(). Any guest that reads the APIC's CCR (current count) register before setting DCR (divide configuration) would trigger a divide by zero exception in the host kernel, leading to a host-OS crash. This patch results in apic->timer.divide_count being initialized to 2 at reset, eliminating the bug (DCR=0 at reset, meaning divide by 2). Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: Move kvm_guest_exit() after local_irq_enable()Laurent Vivier2007-10-221-1/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to make sure that the timer interrupt happens before we clear PF_VCPU, so the accounting code actually sees guest mode. http://lkml.org/lkml/2007/10/15/114 Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: x86 emulator: fix access registers for instructions with ModR/M byte ↵Aurelien Jarno2007-10-221-0/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | and Mod = 3 The patch belows changes the access type to register from memory for instructions that are declared as SrcMem or DstMem, but have a ModR/M byte with Mod = 3. It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU, which are needed for FreeBSD. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: VMX: Force vm86 mode if setting flags during real modeAvi Kivity2007-10-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | When resetting from userspace, we need to handle the flags being cleared even after we are in real mode. Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: x86 emulator: implement 'movnti mem, reg'Sheng Yang2007-10-221-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement emulation of instruction: movnti m32/m64, r32/r64 opcode: 0x0f 0xc3 Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: VMX: Reset mmu context when entering real modeEddie Dong2007-10-222-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Resetting an SMP guest will force AP enter real mode (RESET) with paging enabled in protected mode. While current enter_rmode() can only handle mode switch from nonpaging mode to real mode which leads to SMP reboot failure. Fix by reloading the mmu context on entering real mode. Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: VMX: Handle NMIs before enabling interrupts and preemptionAvi Kivity2007-10-221-4/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This makes sure we handle NMI on the current cpu, and that we don't service maskable interrupts before non-maskable ones. Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: MMU: Set shadow pte atomically in mmu_pte_write_zap_pte()Izik Eidus2007-10-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Setting shadow page table entry should be set atomicly using set_shadow_pte(). Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: x86 emulator: fix repne/repnz decodingLaurent Vivier2007-10-221-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The repnz/repne instructions must set rep_prefix to 1 like rep/repe/repz. This patch correct the disk probe problem met with OpenBSD. This issue appears with commit e70669abd4e60dfea3ac1639848e20e2b8dd1255 because before it, the decoding was done internally to kvm and after it is done by x86_emulate.c (which doesn't do it correctly). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | | KVM: x86 emulator: fix merge screwup due to emulator splitNitin A Kamble2007-10-221-25/+26
| |/ / | | | | | | | | | | | | | | | | | | | | | This code has gone to wrong place in the file. Moving it back to right location. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* | | Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds2007-10-2223-713/+918
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: [S390] 4level-fixup cleanup [S390] Cleanup page table definitions. [S390] Introduce follow_table in uaccess_pt.c [S390] Remove unused user_seg from thread structure. [S390] tlb flush fix. [S390] kernel: Fix dump on panic for DASDs under LPAR. [S390] struct class_device -> struct device conversion. [S390] cio: Fix incomplete commit for uevent suppression. [S390] cio: Use to_channelpath() for device to channel path conversion. [S390] Add per-cpu idle time / idle count sysfs attributes. [S390] Update default configuration.
| * | | [S390] 4level-fixup cleanupMartin Schwidefsky2007-10-227-79/+127
| | | | | | | | | | | | | | | | | | | | | | | | Get independent from asm-generic/4level-fixup.h Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] Cleanup page table definitions.Martin Schwidefsky2007-10-229-328/+305
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - De-confuse the defines for the address-space-control-elements and the segment/region table entries. - Create out of line functions for page table allocation / freeing. - Simplify get_shadow_xxx functions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] Introduce follow_table in uaccess_pt.cMartin Schwidefsky2007-10-221-63/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Define and use follow_table inline in uaccess_pt.c to simplify the code. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] Remove unused user_seg from thread structure.Martin Schwidefsky2007-10-222-13/+3
| | | | | | | | | | | | | | | | Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] tlb flush fix.Martin Schwidefsky2007-10-225-150/+245
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The current tlb flushing code for page table entries violates the s390 architecture in a small detail. The relevant section from the principles of operation (SA22-7832-02 page 3-47): "A valid table entry must not be changed while it is attached to any CPU and may be used for translation by that CPU except to (1) invalidate the entry by using INVALIDATE PAGE TABLE ENTRY or INVALIDATE DAT TABLE ENTRY, (2) alter bits 56-63 of a page-table entry, or (3) make a change by means of a COMPARE AND SWAP AND PURGE instruction that purges the TLB." That means if one thread of a multithreaded applciation uses a vma while another thread does an unmap on it, the page table entries of that vma needs to get removed with IPTE, IDTE or CSP. In some strange and rare situations a cpu could check-stop (die) because a entry has been pushed out of the TLB that is still needed to complete a (milli-coded) instruction. I've never seen it happen with the current code on any of the supported machines, so right now this is a theoretical problem. But I want to fix it nevertheless, to avoid headaches in the futures. To get this implemented correctly without changing common code the primitives ptep_get_and_clear, ptep_get_and_clear_full and ptep_set_wrprotect need to use the IPTE instruction to invalidate the pte before the new pte value gets stored. If IPTE is always used for the three primitives three important operations will have a performace hit: fork, mprotect and exit_mmap. Time for some workarounds: * 1: ptep_get_and_clear_full is used in unmap_vmas to remove page tables entries in a batched tlb gather operation. If the mmu_gather context passed to unmap_vmas has been started with full_mm_flush==1 or if only one cpu is online or if the only user of a mm_struct is the current process then the fullmm indication in the mmu_gather context is set to one. All TLBs for mm_struct are flushed by the tlb_gather_mmu call. No new TLBs can be created while the unmap is in progress. In this case ptep_get_and_clear_full clears the ptes with a simple store. * 2: ptep_get_and_clear is used in change_protection to clear the ptes from the page tables before they are reentered with the new access flags. At the end of the update flush_tlb_range clears the remaining TLBs. In general the ptep_get_and_clear has to issue IPTE for each pte and flush_tlb_range is a nop. But if there is only one user of the mm_struct then ptep_get_and_clear uses simple stores to do the update and flush_tlb_range will flush the TLBs. * 3: Similar to 2, ptep_set_wrprotect is used in copy_page_range for a fork to make all ptes of a cow mapping read-only. At the end of of copy_page_range dup_mmap will flush the TLBs with a call to flush_tlb_mm. Check for mm->mm_users and if there is only one user avoid using IPTE in ptep_set_wrprotect and let flush_tlb_mm clear the TLBs. Overall for single threaded programs the tlb flush code now performs better, for multi threaded programs it is slightly worse. In particular exit_mmap() now does a single IDTE for the mm and then just frees every page cache reference and every page table page directly without a delay over the mmu_gather structure. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] kernel: Fix dump on panic for DASDs under LPAR.Michael Holzheu2007-10-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the ccw method is used to ipl the DASD dump record under LPAR. This mechanism is not reliable, which can cause dump failures. This fix now uses the diag 308 ipl method for all machines, which have diag308 subcode 5 and 4 support. Signed-off-by: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
generated by cgit v1.1 at 2024-09-18 08:16:59 +0000