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2014-10-27s390/mm: disable KSM for storage key enabled pagesDominik Dingel1-5/+12
When storage keys are enabled unmerge already merged pages and prevent new pages from being merged. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-10-27s390/mm: recfactor global pgste updatesDominik Dingel1-1/+1
Replace the s390 specific page table walker for the pgste updates with a call to the common code walk_page_range function. There are now two pte modification functions, one for the reset of the CMMA state and another one for the initialization of the storage keys. Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-10-01KVM: s390: count vcpu wakeups in stat.halt_wakeupDavid Hildenbrand2-0/+2
This patch introduces the halt_wakeup counter used by common code and uses it to count vcpu wakeups done in s390 arch specific code. Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-10-01KVM: s390/facilities: allow TOD-CLOCK steering facility bitChristian Borntraeger1-1/+1
There is nothing to do for KVM to support TOD-CLOCK steering. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
2014-09-17KVM: s390: register flic ops dynamicallyCornelia Huck2-1/+3
Using the new kvm_register_device_ops() interface makes us get rid of an #ifdef in common code. Cc: Gleb Natapov <gleb@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-09-10KVM: s390/interrupt: remove double assignmentChristian Borntraeger1-1/+0
r is already initialized to 0. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
2014-09-10KVM: s390/cmm: Fix prefix handling for diag 10 balloonChristian Borntraeger1-8/+18
The old handling of prefix pages was broken in the diag10 ballooner. We now rely on gmap_discard to check for start > end and do a slow path if the prefix swap pages are affected: 1. discard the pages from start to prefix 2. discard the absolute 0 pages 3. discard the pages after prefix swap to end Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
2014-09-10KVM: s390: get rid of constant condition in ipte_unlock_simpleChristian Borntraeger1-2/+1
Due to the earlier check we know that ipte_lock_count must be 0. No need to add a useless if. Let's make clear that we are going to always wakeup when we execute that code. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2014-09-10KVM: s390: unintended fallthrough for external callChristian Borntraeger1-0/+1
We must not fallthrough if the conditions for external call are not met. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com> Cc: stable@vger.kernel.org
2014-09-10KVM: s390: Limit guest size to 16TBChristian Borntraeger1-1/+1
Currently we fill up a full 5 level page table to hold the guest mapping. Since commit "support gmap page tables with less than 5 levels" we can do better. Having more than 4 TB might be useful for some testing scenarios, so let's just limit ourselves to 16TB guest size. Having more than that is totally untested as I do not have enough swap space/memory. We continue to allow ucontrol the full size. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
2014-09-10KVM: s390: add __must_check to interrupt deliver functionsChristian Borntraeger2-7/+7
We now propagate interrupt injection errors back to the ioctl. We should mark functions that might fail with __must_check. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
2014-09-10KVM: CPACF: Enable MSA4 instructions for kvm guestTony Krowiak1-0/+33
We have to provide a per guest crypto block for the CPUs to enable MSA4 instructions. According to icainfo on z196 or later this enables CCM-AES-128, CMAC-AES-128, CMAC-AES-192 and CMAC-AES-256. Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Michael Mueller <mimu@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> [split MSA4/protected key into two patches]
2014-08-29KVM: remove garbage arg to *hardware_{en,dis}ableRadim Krčmář1-1/+1
In the beggining was on_each_cpu(), which required an unused argument to kvm_arch_ops.hardware_{en,dis}able, but this was soon forgotten. Remove unnecessary arguments that stem from this. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-29KVM: static inline empty kvm_arch functionsRadim Krčmář1-43/+0
Using static inline is going to save few bytes and cycles. For example on powerpc, the difference is 700 B after stripping. (5 kB before) This patch also deals with two overlooked empty functions: kvm_arch_flush_shadow was not removed from arch/mips/kvm/mips.c 2df72e9bc KVM: split kvm_arch_flush_shadow and kvm_arch_sched_in never made it into arch/ia64/kvm/kvm-ia64.c. e790d9ef6 KVM: add kvm_arch_sched_in Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-26Merge tag 'kvm-s390-next-20140825' of ↵Paolo Bonzini5-155/+113
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Fixes and features for 3.18 part 1 1. The usual cleanups: get rid of duplicate code, use defines, factor out the sync_reg handling, additional docs for sync_regs, better error handling on interrupt injection 2. We use KVM_REQ_TLB_FLUSH instead of open coding tlb flushes 3. Additional registers for kvm_run sync regs. This is usually not needed in the fast path due to eventfd/irqfd, but kvm stat claims that we reduced the overhead of console output by ~50% on my system 4. A rework of the gmap infrastructure. This is the 2nd step towards host large page support (after getting rid of the storage key dependency). We introduces two radix trees to store the guest-to-host and host-to-guest translations. This gets us rid of most of the page-table walks in the gmap code. Only one in __gmap_link is left, this one is required to link the shadow page table to the process page table. Finally this contains the plumbing to support gmap page tables with less than 5 levels.
2014-08-26KVM: s390/mm: support gmap page tables with less than 5 levelsMartin Schwidefsky1-2/+2
Add an addressing limit to the gmap address spaces and only allocate the page table levels that are needed for the given limit. The limit is fixed and can not be changed after a gmap has been created. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-26KVM: s390/mm: use radix trees for guest to host mappingsMartin Schwidefsky1-15/+3
Store the target address for the gmap segments in a radix tree instead of using invalid segment table entries. gmap_translate becomes a simple radix_tree_lookup, gmap_fault is split into the address translation with gmap_translate and the part that does the linking of the gmap shadow page table with the process page table. A second radix tree is used to keep the pointers to the segment table entries for segments that are mapped in the guest address space. On unmap of a segment the pointer is retrieved from the radix tree and is used to carry out the segment invalidation in the gmap shadow page table. As the radix tree can only store one pointer, each host segment may only be mapped to exactly one guest location. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25Merge tag 'kvm-s390-20140825' of ↵Paolo Bonzini1-13/+0
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD Here are two fixes for s390 KVM code that prevent: 1. a malicious user to trigger a kernel BUG 2. a malicious user to change the storage key of read-only pages
2014-08-25KVM: s390/mm: cleanup gmap function arguments, variable namesMartin Schwidefsky4-8/+8
Make the order of arguments for the gmap calls more consistent, if the gmap pointer is passed it is always the first argument. In addition distinguish between guest address and user address by naming the variables gaddr for a guest address and vmaddr for a user address. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: don't use kvm lock in interrupt injection codeJens Freimann1-2/+0
The kvm lock protects us against vcpus going away, but they only go away when the virtual machine is shut down. We don't need this mutex here, so let's get rid of it. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: return -EFAULT if lowcore is not mapped during irq deliveryJens Freimann3-25/+24
Currently we just kill the userspace process and exit the thread immediatly without making sure that we don't hold any locks etc. Improve this by making KVM_RUN return -EFAULT if the lowcore is not mapped during interrupt delivery. To achieve this we need to pass the return code of guest memory access routines used in interrupt delivery all the way back to the KVM_RUN ioctl. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: implement KVM_REQ_TLB_FLUSH and make use of itDavid Hildenbrand2-3/+9
Use the KVM_REQ_TLB_FLUSH request in order to trigger tlb flushes instead of manipulating the SIE control block whenever we need it. Also trigger it for a control register sync directly instead of (ab)using kvm_s390_set_prefix(). Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: synchronize more registers with kvm_runDavid Hildenbrand1-14/+46
In order to reduce the number of syscalls when dropping to user space, this patch enables the synchronization of the following "registers" with kvm_run: - ARCH0: CPU timer, clock comparator, TOD programmable register, guest breaking-event register, program parameter - PFAULT: pfault parameters (token, select, compare) The registers are grouped to reduce the overhead when syncing. As this grows the number of sync registers quite a bit, let's move the code synchronizing registers with kvm_run from kvm_arch_vcpu_ioctl_run() into separate helper routines. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: no special machine check deliveryChristian Borntraeger3-66/+0
The load PSW handler does not have to inject pending machine checks. This can wait until the CPU runs the generic interrupt injection code. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2014-08-25KVM: s390: clear kvm_dirty_regs when dropping to user spaceDavid Hildenbrand1-4/+2
We should make sure that all kvm_dirty_regs bits are cleared before dropping to user space. Until now, some would remain pending. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: factor out get_ilc() functionJens Freimann1-20/+21
Let's make this a reusable function. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: add defines for pfault init delivery codeJens Freimann1-2/+4
Get rid of open coded values for pfault init. Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-08-25KVM: s390: Fix user triggerable bug in dead codeChristian Borntraeger1-13/+0
In the early days, we had some special handling for the KVM_EXIT_S390_SIEIC exit, but this was gone in 2009 with commit d7b0b5eb3000 (KVM: s390: Make psw available on all exits, not just a subset). Now this switch statement is just a sanity check for userspace not messing with the kvm_run structure. Unfortunately, this allows userspace to trigger a kernel BUG. Let's just remove this switch statement. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Cc: stable@vger.kernel.org
2014-08-21KVM: add kvm_arch_sched_inRadim Krčmář1-0/+4
Introduce preempt notifiers for architecture specific code. Advantage over creating a new notifier in every arch is slightly simpler code and guaranteed call order with respect to kvm_sched_in. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-05KVM: Give IRQFD its own separate enabling Kconfig optionPaul Mackerras1-0/+1
Currently, the IRQFD code is conditional on CONFIG_HAVE_KVM_IRQ_ROUTING. So that we can have the IRQFD code compiled in without having the IRQ routing code, this creates a new CONFIG_HAVE_KVM_IRQFD, makes the IRQFD code conditional on it instead of CONFIG_HAVE_KVM_IRQ_ROUTING, and makes all the platforms that currently select HAVE_KVM_IRQ_ROUTING also select HAVE_KVM_IRQFD. Signed-off-by: Paul Mackerras <paulus@samba.org> Tested-by: Eric Auger <eric.auger@linaro.org> Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-05KVM: irqchip: Provide and use accessors for irq routing tablePaul Mackerras1-2/+1
This provides accessor functions for the KVM interrupt mappings, in order to reduce the amount of code that accesses the fields of the kvm_irq_routing_table struct, and restrict that code to one file, virt/kvm/irqchip.c. The new functions are kvm_irq_map_gsi(), which maps from a global interrupt number to a set of IRQ routing entries, and kvm_irq_map_chip_pin, which maps from IRQ chip and pin numbers to a global interrupt number. This also moves the update of kvm_irq_routing_table::chip[][] into irqchip.c, out of the various kvm_set_routing_entry implementations. That means that none of the kvm_set_routing_entry implementations need the kvm_irq_routing_table argument anymore, so this removes it. This does not change any locking or data lifetime rules. Signed-off-by: Paul Mackerras <paulus@samba.org> Tested-by: Eric Auger <eric.auger@linaro.org> Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2014-08-05Merge tag 'signed-kvm-ppc-next' of git://github.com/agraf/linux-2.6 into kvmPaolo Bonzini1-1/+1
Patch queue for ppc - 2014-08-01 Highlights in this release include: - BookE: Rework instruction fetch, not racy anymore now - BookE HV: Fix ONE_REG accessors for some in-hardware registers - Book3S: Good number of LE host fixes, enable HV on LE - Book3S: Some misc bug fixes - Book3S HV: Add in-guest debug support - Book3S HV: Preload cache lines on context switch - Remove 440 support Alexander Graf (31): KVM: PPC: Book3s PR: Disable AIL mode with OPAL KVM: PPC: Book3s HV: Fix tlbie compile error KVM: PPC: Book3S PR: Handle hyp doorbell exits KVM: PPC: Book3S PR: Fix ABIv2 on LE KVM: PPC: Book3S PR: Fix sparse endian checks PPC: Add asm helpers for BE 32bit load/store KVM: PPC: Book3S HV: Make HTAB code LE host aware KVM: PPC: Book3S HV: Access guest VPA in BE KVM: PPC: Book3S HV: Access host lppaca and shadow slb in BE KVM: PPC: Book3S HV: Access XICS in BE KVM: PPC: Book3S HV: Fix ABIv2 on LE KVM: PPC: Book3S HV: Enable for little endian hosts KVM: PPC: Book3S: Move vcore definition to end of kvm_arch struct KVM: PPC: Deflect page write faults properly in kvmppc_st KVM: PPC: Book3S: Stop PTE lookup on write errors KVM: PPC: Book3S: Add hack for split real mode KVM: PPC: Book3S: Make magic page properly 4k mappable KVM: PPC: Remove 440 support KVM: Rename and add argument to check_extension KVM: Allow KVM_CHECK_EXTENSION on the vm fd KVM: PPC: Book3S: Provide different CAPs based on HV or PR mode KVM: PPC: Implement kvmppc_xlate for all targets KVM: PPC: Move kvmppc_ld/st to common code KVM: PPC: Remove kvmppc_bad_hva() KVM: PPC: Use kvm_read_guest in kvmppc_ld KVM: PPC: Handle magic page in kvmppc_ld/st KVM: PPC: Separate loadstore emulation from priv emulation KVM: PPC: Expose helper functions for data/inst faults KVM: PPC: Remove DCR handling KVM: PPC: HV: Remove generic instruction emulation KVM: PPC: PR: Handle FSCR feature deselects Alexey Kardashevskiy (1): KVM: PPC: Book3S: Fix LPCR one_reg interface Aneesh Kumar K.V (4): KVM: PPC: BOOK3S: PR: Fix PURR and SPURR emulation KVM: PPC: BOOK3S: PR: Emulate virtual timebase register KVM: PPC: BOOK3S: PR: Emulate instruction counter KVM: PPC: BOOK3S: HV: Update compute_tlbie_rb to handle 16MB base page Anton Blanchard (2): KVM: PPC: Book3S HV: Fix ABIv2 indirect branch issue KVM: PPC: Assembly functions exported to modules need _GLOBAL_TOC() Bharat Bhushan (10): kvm: ppc: bookehv: Added wrapper macros for shadow registers kvm: ppc: booke: Use the shared struct helpers of SRR0 and SRR1 kvm: ppc: booke: Use the shared struct helpers of SPRN_DEAR kvm: ppc: booke: Add shared struct helpers of SPRN_ESR kvm: ppc: booke: Use the shared struct helpers for SPRN_SPRG0-7 kvm: ppc: Add SPRN_EPR get helper function kvm: ppc: bookehv: Save restore SPRN_SPRG9 on guest entry exit KVM: PPC: Booke-hv: Add one reg interface for SPRG9 KVM: PPC: Remove comment saying SPRG1 is used for vcpu pointer KVM: PPC: BOOKEHV: rename e500hv_spr to bookehv_spr Michael Neuling (1): KVM: PPC: Book3S HV: Add H_SET_MODE hcall handling Mihai Caraman (8): KVM: PPC: e500mc: Enhance tlb invalidation condition on vcpu schedule KVM: PPC: e500: Fix default tlb for victim hint KVM: PPC: e500: Emulate power management control SPR KVM: PPC: e500mc: Revert "add load inst fixup" KVM: PPC: Book3e: Add TLBSEL/TSIZE defines for MAS0/1 KVM: PPC: Book3s: Remove kvmppc_read_inst() function KVM: PPC: Allow kvmppc_get_last_inst() to fail KVM: PPC: Bookehv: Get vcpu's last instruction for emulation Paul Mackerras (4): KVM: PPC: Book3S: Controls for in-kernel sPAPR hypercall handling KVM: PPC: Book3S: Allow only implemented hcalls to be enabled or disabled KVM: PPC: Book3S PR: Take SRCU read lock around RTAS kvm_read_guest() call KVM: PPC: Book3S: Make kvmppc_ld return a more accurate error indication Stewart Smith (2): Split out struct kvmppc_vcore creation to separate function Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8 Conflicts: Documentation/virtual/kvm/api.txt
2014-07-31KVM: s390: rework broken SIGP STOP interrupt handlingDavid Hildenbrand1-0/+3
A VCPU might never stop if it intercepts (for whatever reason) between "fake interrupt delivery" and execution of the stop function. Heart of the problem is that SIGP STOP is an interrupt that has to be processed on every SIE entry until the VCPU finally executes the stop function. This problem was made apparent by commit 7dfc63cf977447e09b1072911c2 (KVM: s390: allow only one SIGP STOP (AND STORE STATUS) at a time). With the old code, the guest could (incorrectly) inject SIGP STOPs multiple times. The bug of losing a sigp stop exists in KVM before 7dfc63cf97, but it was hidden by Linux guests doing a sigp stop loop. The new code (rightfully) returns CC=2 and does not queue a new interrupt. This patch is a simple fix of the problem. Longterm we are going to rework that code - e.g. get rid of the action bits and so on. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> [some additional patch description]
2014-07-30KVM: s390: Fix memory leak on busy SIGP stopChristian Borntraeger1-0/+1
commit 7dfc63cf977447e09b1072911c22564f900fc578 (KVM: s390: allow only one SIGP STOP (AND STORE STATUS) at a time) introduced a memory leak if a sigp stop is already pending. Free the allocated inti structure. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
2014-07-28KVM: Rename and add argument to check_extensionAlexander Graf1-1/+1
In preparation to make the check_extension function available to VM scope we add a struct kvm * argument to the function header and rename the function accordingly. It will still be called from the /dev/kvm fd, but with a NULL argument for struct kvm *. Signed-off-by: Alexander Graf <agraf@suse.de> Acked-by: Paolo Bonzini <pbonzini@redhat.com>
2014-07-21KVM: s390: advertise KVM_CAP_S390_IRQCHIPCornelia Huck1-0/+1
We should advertise all capabilities, including those that can be enabled. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-21KVM: s390: remove the tasklet used by the hrtimerDavid Hildenbrand3-15/+1
We can get rid of the tasklet used for waking up a VCPU in the hrtimer code but wakeup the VCPU directly. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-21KVM: s390: move vcpu wakeup code to a central pointDavid Hildenbrand3-23/+22
Let's move the vcpu wakeup code to a central point. We should set the vcpu->preempted flag only if the target is actually sleeping and before the real wakeup happens. Otherwise the preempted flag might be set, when not necessary. This may result in immediate reschedules after schedule() in some scenarios. The wakeup code doesn't require the local_int.lock to be held. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-21KVM: s390: remove _bh locking from start_stop_lockDavid Hildenbrand1-4/+4
The start_stop_lock is no longer acquired when in atomic context, therefore we can convert it into an ordinary spin_lock. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-21KVM: s390: remove _bh locking from local_int.lockDavid Hildenbrand3-28/+28
local_int.lock is not used in a bottom-half handler anymore, therefore we can turn it into an ordinary spin_lock at all occurrences. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-21KVM: s390: cleanup handle_wait by reusing kvm_vcpu_blockDavid Hildenbrand2-36/+8
This patch cleans up the code in handle_wait by reusing the common code function kvm_vcpu_block. signal_pending(), kvm_cpu_has_pending_timer() and kvm_arch_vcpu_runnable() are sufficient for checking if we need to wake-up that VCPU. kvm_vcpu_block uses these functions, so no checks are lost. The flag "timer_due" can be removed - kvm_cpu_has_pending_timer() tests whether the timer is pending, thus the vcpu is correctly woken up. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-10KVM: s390: implement KVM_(S|G)ET_MP_STATE for user space state controlDavid Hildenbrand4-6/+43
This patch - adds s390 specific MP states to linux headers and documents them - implements the KVM_{SET,GET}_MP_STATE ioctls - enables KVM_CAP_MP_STATE - allows user space to control the VCPU state on s390. If user space sets the VCPU state using the ioctl KVM_SET_MP_STATE, we can disable manual changing of the VCPU state and trust user space to do the right thing. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-10KVM: s390: remove __cpu_is_stopped and expose is_vcpu_stoppedDavid Hildenbrand2-8/+3
The function "__cpu_is_stopped" is not used any more. Let's remove it and expose the function "is_vcpu_stopped" instead, which is actually what we want. This patch also converts an open coded check for CPUSTAT_STOPPED to is_vcpu_stopped(). Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-10KVM: s390: move finalization of SIGP STOP orders to kvm_s390_vcpu_stopDavid Hildenbrand2-19/+20
Let's move the finalization of SIGP STOP and SIGP STOP AND STORE STATUS orders to the point where the VCPU is actually stopped. This change is needed to prepare for a user space driven VCPU state change. The action_bits may only be cleared when setting the cpu state to STOPPED while holding the local irq lock. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-07-10KVM: s390: allow only one SIGP STOP (AND STORE STATUS) at a timeDavid Hildenbrand1-1/+6
A SIGP STOP (AND STORE STATUS) order is complete as soon as the VCPU has been stopped. This patch makes sure that only one SIGP STOP (AND STORE STATUS) may be pending at a time (as defined by the architecture). If the action_bits are still set, a SIGP STOP has been issued but not completed yet. The VCPU is busy for further SIGP STOP orders. Also set the CPUSTAT_STOP_INT after the action_bits variable has been modified (the same order that is used when injecting a KVM_S390_SIGP_STOP from userspace). Both changes are needed in preparation for a user space driven VCPU state change (to avoid race conditions). Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-06-04Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm into nextLinus Torvalds13-498/+2963
Pull KVM updates from Paolo Bonzini: "At over 200 commits, covering almost all supported architectures, this was a pretty active cycle for KVM. Changes include: - a lot of s390 changes: optimizations, support for migration, GDB support and more - ARM changes are pretty small: support for the PSCI 0.2 hypercall interface on both the guest and the host (the latter acked by Catalin) - initial POWER8 and little-endian host support - support for running u-boot on embedded POWER targets - pretty large changes to MIPS too, completing the userspace interface and improving the handling of virtualized timer hardware - for x86, a larger set of changes is scheduled for 3.17. Still, we have a few emulator bugfixes and support for running nested fully-virtualized Xen guests (para-virtualized Xen guests have always worked). And some optimizations too. The only missing architecture here is ia64. It's not a coincidence that support for KVM on ia64 is scheduled for removal in 3.17" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (203 commits) KVM: add missing cleanup_srcu_struct KVM: PPC: Book3S PR: Rework SLB switching code KVM: PPC: Book3S PR: Use SLB entry 0 KVM: PPC: Book3S HV: Fix machine check delivery to guest KVM: PPC: Book3S HV: Work around POWER8 performance monitor bugs KVM: PPC: Book3S HV: Make sure we don't miss dirty pages KVM: PPC: Book3S HV: Fix dirty map for hugepages KVM: PPC: Book3S HV: Put huge-page HPTEs in rmap chain for base address KVM: PPC: Book3S HV: Fix check for running inside guest in global_invalidates() KVM: PPC: Book3S: Move KVM_REG_PPC_WORT to an unused register number KVM: PPC: Book3S: Add ONE_REG register names that were missed KVM: PPC: Add CAP to indicate hcall fixes KVM: PPC: MPIC: Reset IRQ source private members KVM: PPC: Graciously fail broken LE hypercalls PPC: ePAPR: Fix hypercall on LE guest KVM: PPC: BOOK3S: Remove open coded make_dsisr in alignment handler KVM: PPC: BOOK3S: Always use the saved DAR value PPC: KVM: Make NX bit available with magic page KVM: PPC: Disable NX for old magic page using guests KVM: PPC: BOOK3S: HV: Add mixed page-size support for guest ...
2014-06-03Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux into next Pull first set of s390 updates from Martin Schwidefsky: "The biggest change in this patchset is conversion from the bootmem bitmaps to the memblock code. This conversion requires two common code patches to introduce the 'physmem' memblock list. We experimented with ticket spinlocks but in the end decided against them as they perform poorly on virtualized systems. But the spinlock cleanup and some small improvements are included. The uaccess code got another optimization, the get_user/put_user calls are now inline again for kernel compiles targeted at z10 or newer machines. This makes the text segment shorter and the code gets a little bit faster. And as always some bug fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (31 commits) s390/lowcore: replace lowcore irb array with a per-cpu variable s390/lowcore: reserve 96 bytes for IRB in lowcore s390/facilities: remove extract-cpu-time facility check s390: require mvcos facility for z10 and newer machines s390/boot: fix boot of compressed kernel built with gcc 4.9 s390/cio: remove weird assignment during argument evaluation s390/time: cast tv_nsec to u64 prior to shift in update_vsyscall s390/oprofile: make return of 0 explicit s390/spinlock: refactor arch_spin_lock_wait[_flags] s390/rwlock: add missing local_irq_restore calls s390/spinlock,rwlock: always to a load-and-test first s390/cio: fix multiple structure definitions s390/spinlock: fix system hang with spin_retry <= 0 s390/appldata: add slab.h for kzalloc/kfree s390/uaccess: provide inline variants of get_user/put_user s390/pci: add some new arch specific pci attributes s390/pci: use pdev->dev.groups for attribute creation s390/pci: use macro for attribute creation s390/pci: improve state check when processing hotplug events s390: split TIF bits into CIF, PIF and TIF bits ...
2014-05-30KVM: s390: Intercept the tprot instructionMatthew Rosato1-1/+3
Based on original patch from Jeng-fang (Nick) Wang When standby memory is specified for a guest Linux, but no virtual memory has been allocated on the Qemu host backing that guest, the guest memory detection process encounters a memory access exception which is not thrown from the KVM handle_tprot() instruction-handler function. The access exception comes from sie64a returning EFAULT, which then passes an addressing exception to the guest. Unfortunately this does not the proper PSW fixup (nullifying vs. suppressing) so the guest will get a fault for the wrong address. Let's just intercept the tprot instruction all the time to do the right thing and not go the page fault handler path for standby memory. tprot is only used by Linux during startup so some exits should be ok. Without this patch, standby memory cannot be used with KVM. Signed-off-by: Nick Wang <jfwang@us.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Tested-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-05-30KVM: s390: a VCPU is already started when delivering interruptsDavid Hildenbrand1-1/+0
This patch removes the start of a VCPU when delivering a RESTART interrupt. Interrupt delivery is called from kvm_arch_vcpu_ioctl_run. So the VCPU is already considered started - no need to call kvm_s390_vcpu_start. This function will early exit anyway. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
2014-05-30KVM: s390: check the given debug flags, not the set onesDavid Hildenbrand1-1/+1
This patch fixes a minor bug when updating the guest debug settings. We should check the given debug flags, not the already set ones. Doesn't do any harm but too many (for now unused) flags could be set internally without error. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
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