- 30 1月, 2014 2 次提交
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由 Dominik Dingel 提交于
In the case of a fault, we will retry to exit sie64 but with gmap fault indication for this thread set. This makes it possible to handle async page faults. Based on a patch from Martin Schwidefsky. Signed-off-by: NDominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
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由 Jens Freimann 提交于
This patch adds a floating irq controller as a kvm_device. It will be necessary for migration of floating interrupts as well as for hardening the reset code by allowing user space to explicitly remove all pending floating interrupts. Signed-off-by: NJens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
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- 20 1月, 2014 1 次提交
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由 Christian Borntraeger 提交于
Seems that commit 210b1607 (KVM: s390: Removed SIE_INTERCEPT_UCONTROL) lost a hunk when we reworked our patch queue to rework the async_fp code. We now ignore faults on the sie instruction (guest accesses non-existing memory) instead of sending a fault into the guest. This leads to hang situations with the old virtio transport that checks for descriptor memory after guest memory. Instead of bailing out this code now goes wild... Lets re-add the check. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
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- 17 1月, 2014 2 次提交
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由 Thomas Huth 提交于
The Load-Program-Parameter Facility is available for guests without any further ado, so we should indicate its availability by setting facility bit 40 if it is supported by the host. Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: NMichael Mueller <mimu@linux.vnet.ibm.com> Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
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由 Michael Mueller 提交于
This patch enables transactional execution for KVM guests on s390 systems zec12 or later. We rework the allocation of the page containing the sie_block to also back the Interception Transaction Diagnostic Block. If available the TE facilities will be enabled. Setting bit 73 and 50 in vfacilities bitmask reveals the HW facilities Transactional Memory and Constraint Transactional Memory respectively to the KVM guest. Furthermore, the patch restores the Program-Interruption TDB from the Interception TDB in case a program interception has occurred and the ITDB has a valid format. Signed-off-by: NMichael Mueller <mimu@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
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- 28 11月, 2013 3 次提交
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由 Thomas Huth 提交于
Only the most 7 significant bytes of the clock comparator must be saved to the status area, and the byte at offset 304 has to be zero. Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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由 Thomas Huth 提交于
The SIGP order STOP_AND_STORE_STATUS is defined to stop a CPU and store its status. However, we only stored the status if the CPU was still running, so make sure that the status is now also stored if the CPU was already stopped. This fixes the problem that the CPU information was not stored correctly in kdump files, rendering them unreadable. Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com> Cc: stable@vger.kernel.org Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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由 Thomas Huth 提交于
The SIE_INTERCEPT_UCONTROL can be removed by moving the related code from kvm_arch_vcpu_ioctl_run() to vcpu_post_run(). Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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- 24 10月, 2013 1 次提交
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由 Martin Schwidefsky 提交于
The FPC_VALID_MASK has been used to check the validity of the value to be loaded into the floating-point-control register. With the introduction of the floating-point extension facility and the decimal-floating-point additional bits have been defined which need to be checked in a non straight forward way. So far these bits have been ignored which can cause an incorrect results for decimal- floating-point operations, e.g. an incorrect rounding mode to be set after signal return. The static check with the FPC_VALID_MASK is replaced with a trial load of the floating-point-control value, see test_fp_ctl. In addition an information leak with the padding word between the floating-point-control word and the floating-point registers in the s390_fp_regs is fixed. Reported-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 17 10月, 2013 1 次提交
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由 Aneesh Kumar K.V 提交于
We will use that in the later patch to find the kvm ops handler Signed-off-by: NAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: NAlexander Graf <agraf@suse.de>
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- 25 9月, 2013 4 次提交
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由 Thomas Huth 提交于
The kvm->srcu lock has to be held while accessing the memory of guests and during certain other actions. This patch now adds the locks to the __vcpu_run function so that all affected code is protected now (and additionally to the KVM_S390_STORE_STATUS ioctl, which can be called out-of-band and needs a separate lock). Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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由 Thomas Huth 提交于
Moved the do-while loop from kvm_arch_vcpu_ioctl_run into __vcpu_run and the calling of kvm_handle_sie_intercept() into vcpu_post_run() (so we can add the srcu locks in a proper way in the next patch). Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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由 Thomas Huth 提交于
In preparation for the following patch (which will change the indentation of __vcpu_run quite a bit), this patch puts most of the code from __vcpu_run into separate functions. The first function handles the code that runs before the SIE instruction and the other one handles the code that runs afterwards. Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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由 Thomas Huth 提交于
The need for SIE_INTERCEPT_RERUNVCPU has been removed long ago already, with the following commit: f7850c92 [S390] remove kvm mmu reload on s390 Since the remainders are dead code, they are now removed by this patch. Signed-off-by: NThomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 29 7月, 2013 2 次提交
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由 Michael Mueller 提交于
The patch renames the array holding the HW facility bitmaps. This allows to interprete the variable as set of virtual machine specific "virtual" facilities. The basic idea is to make virtual facilities externally managable in future. An availability test for virtual facilites has been added as well. Signed-off-by: NMichael Mueller <mimu@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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由 Dominik Dingel 提交于
Any uaccess between guest_enter and guest_exit could trigger a page fault, the page fault handler would handle it as a guest fault and translate a user address as guest address. Signed-off-by: NDominik Dingel <dingel@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> CC: stable@vger.kernel.org Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 18 7月, 2013 1 次提交
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由 Takuya Yoshikawa 提交于
This is called right after the memslots is updated, i.e. when the result of update_memslots() gets installed in install_new_memslots(). Since the memslots needs to be updated twice when we delete or move a memslot, kvm_arch_commit_memory_region() does not correspond to this exactly. In the following patch, x86 will use this new API to check if the mmio generation has reached its maximum value, in which case mmio sptes need to be flushed out. Signed-off-by: NTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Acked-by: NAlexander Graf <agraf@suse.de> Reviewed-by: NXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 17 6月, 2013 3 次提交
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由 Christian Borntraeger 提交于
Lets use the common waitqueue for kvm cpus on s390. By itself it is just a cleanup, but it should also improve the accuracy of diag 0x44 which is implemented via kvm_vcpu_on_spin. kvm_vcpu_on_spin has an explicit check for waiting on the waitqueue to optimize the yielding. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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由 Michael Mueller 提交于
cleanup of arch specific code to use common code provided vcpu slab cache instead of kzalloc() provided memory Signed-off-by: NMichael Mueller <mimu@linux.vnet.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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由 Christian Borntraeger 提交于
This patch enables kvm to give large pages to the guest. The heavy lifting is done by the hardware, the host only has to take care of the PFMF instruction, which is also part of EDAT-1. We also support the non-quiescing key setting facility if the host supports it, to behave similar to the interpretation of sske. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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- 03 6月, 2013 1 次提交
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由 Cornelia Huck 提交于
Providing a "devname:kvm" module alias enables automatic loading of the kvm module when /dev/kvm is opened. Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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- 21 5月, 2013 3 次提交
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由 Martin Schwidefsky 提交于
Do not automatically restart the sie instruction in entry64.S after an interrupt, return to the caller with a reason code instead. That allows to deal with RCU and other conditions in C code. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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由 Christian Borntraeger 提交于
The guest prefix pages must be mapped writeable all the time while SIE is running, otherwise the guest might see random behaviour. (pinned at the pte level) Turns out that mlocking is not enough, the page table entry (not the page) might change or become r/o. This patch uses the gmap notifiers to kick guest cpus out of SIE. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Acked-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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由 Christian Borntraeger 提交于
Lets provide functions to prevent KVM from reentering SIE and to kick cpus out of SIE. We cannot use the common kvm_vcpu_kick code, since we need to kick out guests in places that hold architecture specific locks (e.g. pgste lock) which might be necessary on the other cpus - so no waiting possible. So lets provide a bit in a private field of the sie control block that acts as a gate keeper, after we claimed we are in SIE. Please note that we do not reuse prog0c, since we want to access that bit without atomic ops. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Acked-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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- 02 4月, 2013 4 次提交
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由 Nick Wang 提交于
Return KVM_USER_MEM_SLOTS in kvm_dev_ioctl_check_extension(). Signed-off-by: NNick Wang <jfwang@us.ibm.com> Reviewed-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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由 Nick Wang 提交于
To model the standby memory with memory_region_add_subregion and friends, the guest would have one or more regions of ram. Remove the check allowing only one memory slot and the check requiring the real address of memory slot starts at zero. Signed-off-by: NNick Wang <jfwang@us.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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由 Heiko Carstens 提交于
kvm_s390_inject_program_int() and friends may fail if no memory is available. This must be reported to the calling functions, so that this gets passed down to user space which should fix the situation. Alternatively we end up with guest state corruption. So fix this and enforce return value checking by adding a __must_check annotation to all of these function prototypes. Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com> Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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由 Christian Borntraeger 提交于
Some memslot updates dont affect the gmap implementation, e.g. setting/unsetting dirty tracking. Since a gmap update will cause tlb flushes and segment table invalidations we want to avoid that. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NGleb Natapov <gleb@redhat.com>
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- 06 3月, 2013 1 次提交
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由 Cornelia Huck 提交于
Enable ioeventfd support on s390 and hook up diagnose 500 virtio-ccw notifications. Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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- 05 3月, 2013 3 次提交
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由 Takuya Yoshikawa 提交于
This patch makes the parameter old a const pointer to the old memory slot and adds a new parameter named change to know the change being requested: the former is for removing extra copying and the latter is for cleaning up the code. Signed-off-by: NTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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由 Takuya Yoshikawa 提交于
This patch drops the parameter old, a copy of the old memory slot, and adds a new parameter named change to know the change being requested. This not only cleans up the code but also removes extra copying of the memory slot structure. Signed-off-by: NTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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由 Takuya Yoshikawa 提交于
X86 does not use this any more. The remaining user, s390's !user_alloc check, can be simply removed since KVM_SET_MEMORY_REGION ioctl is no longer supported. Note: fixed powerpc's indentations with spaces to suppress checkpatch errors. Signed-off-by: NTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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- 14 2月, 2013 1 次提交
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由 Martin Schwidefsky 提交于
The s390 architecture is unique in respect to dirty page detection, it uses the change bit in the per-page storage key to track page modifications. All other architectures track dirty bits by means of page table entries. This property of s390 has caused numerous problems in the past, e.g. see git commit ef5d437f "mm: fix XFS oops due to dirty pages without buffers on s390". To avoid future issues in regard to per-page dirty bits convert s390 to a fault based software dirty bit detection mechanism. All user page table entries which are marked as clean will be hardware read-only, even if the pte is supposed to be writable. A write by the user process will trigger a protection fault which will cause the user pte to be marked as dirty and the hardware read-only bit is removed. With this change the dirty bit in the storage key is irrelevant for Linux as a host, but the storage key is still required for KVM guests. The effect is that page_test_and_clear_dirty and the related code can be removed. The referenced bit in the storage key is still used by the page_test_and_clear_young primitive to provide page age information. For page cache pages of mappings with mapping_cap_account_dirty there will not be any change in behavior as the dirty bit tracking already uses read-only ptes to control the amount of dirty pages. Only for swap cache pages and pages of mappings without mapping_cap_account_dirty there can be additional protection faults. To avoid an excessive number of additional faults the mk_pte primitive checks for PageDirty if the pgprot value allows for writes and pre-dirties the pte. That avoids all additional faults for tmpfs and shmem pages until these pages are added to the swap cache. Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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- 30 1月, 2013 1 次提交
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由 Christian Borntraeger 提交于
On store status we need to copy the current state of registers into a save area. Currently we might save stale versions: The sie state descriptor doesnt have fields for guest ACRS,FPRS, those registers are simply stored in the host registers. The host program must copy these away if needed. We do that in vcpu_put/load. If we now do a store status in KVM code between vcpu_put/load, the saved values are not up-to-date. Lets collect the ACRS/FPRS before saving them. This also fixes some strange problems with hotplug and virtio-ccw, since the low level machine check handler (on hotplug a machine check will happen) will revalidate all registers with the content of the save area. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> CC: stable@vger.kernel.org Signed-off-by: NGleb Natapov <gleb@redhat.com>
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- 11 1月, 2013 1 次提交
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由 Christian Borntraeger 提交于
commit b080935c kvm: Directly account vtime to system on guest switch also removed the irq_disable/enable around kvm guest switch, which is correct in itself. Unfortunately, there is a BUG ON that (correctly) checks for preemptible to cover the call to rcu later on. (Introduced with commit 8fa22068 KVM: make guest mode entry to be rcu quiescent state) This check might trigger depending on the kernel config. Lets make sure that no preemption happens during kvm_guest_enter. We can enable preemption again after the call to rcu_virt_note_context_switch returns. Please note that we continue to run s390 guests with interrupts enabled. Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> CC: Gleb Natapov <gleb@redhat.com> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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- 08 1月, 2013 2 次提交
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由 Cornelia Huck 提交于
Add a new capability, KVM_CAP_S390_CSS_SUPPORT, which will pass intercepts for channel I/O instructions to userspace. Only I/O instructions interacting with I/O interrupts need to be handled in-kernel: - TEST PENDING INTERRUPTION (tpi) dequeues and stores pending interrupts entirely in-kernel. - TEST SUBCHANNEL (tsch) dequeues pending interrupts in-kernel and exits via KVM_EXIT_S390_TSCH to userspace for subchannel- related processing. Reviewed-by: NMarcelo Tosatti <mtosatti@redhat.com> Reviewed-by: NAlexander Graf <agraf@suse.de> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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由 Cornelia Huck 提交于
Make s390 support KVM_ENABLE_CAP. Reviewed-by: NMarcelo Tosatti <mtosatti@redhat.com> Acked-by: NAlexander Graf <agraf@suse.de> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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- 14 12月, 2012 1 次提交
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由 Alex Williamson 提交于
There's no need for this to be an int, it holds a boolean. Move to the end of the struct for alignment. Reviewed-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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- 28 11月, 2012 1 次提交
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由 Marcelo Tosatti 提交于
TSC initialization will soon make use of online_vcpus. Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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- 30 10月, 2012 1 次提交
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由 Frederic Weisbecker 提交于
Switching to or from guest context is done on ioctl context. So by the time we call kvm_guest_enter() or kvm_guest_exit() we know we are not running the idle task. As a result, we can directly account the cputime using vtime_account_system(). There are two good reasons to do this: * We avoid some useless checks on guest switch. It optimizes a bit this fast path. * In the case of CONFIG_IRQ_TIME_ACCOUNTING, calling vtime_account() checks for irq time to account. This is pointless since we know we are not in an irq on guest switch. This is wasting cpu cycles for no good reason. vtime_account_system() OTOH is a no-op in this config option. * We can remove the irq disable/enable around kvm guest switch in s390. A further optimization may consist in introducing a vtime_account_guest() that directly calls account_guest_time(). Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Avi Kivity <avi@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Joerg Roedel <joerg.roedel@amd.com> Cc: Alexander Graf <agraf@suse.de> Cc: Xiantao Zhang <xiantao.zhang@intel.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
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