- 31 Mar, 2015 8 commits
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Jens Freimann authored
This patch adds support to migrate vcpu interrupts. Two new vcpu ioctls are added which get/set the complete status of pending interrupts in one go. The ioctls are marked as available with the new capability KVM_CAP_S390_IRQ_STATE. We can not use a ONEREG, as the number of pending local interrupts is not constant and depends on the number of CPUs. To retrieve the interrupt state we add an ioctl KVM_S390_GET_IRQ_STATE. Its input parameter is a pointer to a struct kvm_s390_irq_state which has a buffer and length. For all currently pending interrupts, we copy a struct kvm_s390_irq into the buffer and pass it to userspace. To store interrupt state into a buffer provided by userspace, we add an ioctl KVM_S390_SET_IRQ_STATE. It passes a struct kvm_s390_irq_state into the kernel and injects all interrupts contained in the buffer. Signed-off-by:
Jens Freimann <jfrei@linux.vnet.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Acked-by:
Cornelia Huck <cornelia.huck@de.ibm.com>
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Jens Freimann authored
Let's provide a version of kvm_s390_inject_vcpu() that does not acquire the local-interrupt lock and skips waking up the vcpu. To be used in a later patch for vcpu-local interrupt migration, where we are already holding the lock. Reviewed-by:
David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
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Jens Freimann authored
We have introduced struct kvm_s390_irq a while ago which allows to inject all kinds of interrupts as defined in the Principles of Operation. Add ioctl to inject interrupts with the extended struct kvm_s390_irq Signed-off-by:
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David Hildenbrand authored
We now have a mechanism for delivering interrupts according to their priority. Let's inject them using our new infrastructure (instead of letting only hardware handle them), so we can be sure that the irq priorities are satisfied. For s390, the cpu timer and the clock comparator are to be checked for common code kvm_cpu_has_pending_timer(), although the cpu timer is only stepped when the guest is being executed. Reviewed-by:
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Jens Freimann authored
This patch makes interrupt handling compliant to the z/Architecture Principles of Operation with regard to interrupt priorities. Add a bitmap for pending floating interrupts. Each bit relates to a interrupt type and its list. A turned on bit indicates that a list contains items (interrupts) which need to be delivered. When delivering interrupts on a cpu we can merge the existing bitmap for cpu-local interrupts and floating interrupts and have a single mechanism for delivery. Currently we have one list for all kinds of floating interrupts and a corresponding spin lock. This patch adds a separate list per interrupt type. An exception to this are service signal and machine check interrupts, as there can be only one pending interrupt at a time. Signed-off-by:
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Jens Freimann authored
This fixes a bug introduced with commit c05c4186 ("KVM: s390: add floating irq controller"). get_all_floating_irqs() does copy_to_user() while holding a spin lock. Let's fix this by filling a temporary buffer first and copy it to userspace after giving up the lock. Cc: <stable@vger.kernel.org> # 3.18+: 69a8d456 KVM: s390: no need to hold... Reviewed-by:
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Christian Borntraeger authored
After some review about what these facilities do, the following facilities will work under KVM and can, therefore, be reported to the guest if the cpu model and the host cpu provide this bit. There are plans underway to make the whole bit thing more readable, but its not yet finished. So here are some last bit changes and we enhance the KVM mask with: 9 The sense-running-status facility is installed in the z/Architecture architectural mode. ---> handled by SIE or KVM 10 The conditional-SSKE facility is installed in the z/Architecture architectural mode. ---> handled by SIE. KVM will retry SIE 13 The IPTE-range facility is installed in the z/Architecture architectural mode. ---> handled by SIE. KVM will retry SIE 36 The enhanced-monitor facility is installed in the z/Architecture architectural mode. ---> handled by SIE 47 The CMPSC-enhancement facility is installed in the z/Architecture architectural mode. ---> handled by SIE 48 The decimal-floating-point zoned-conversion facility is installed in the z/Architecture architectural mode. ---> handled by SIE 49 The execution-hint, load-and-trap, miscellaneous- instruction-extensions and processor-assist ---> handled by SIE 51 The local-TLB-clearing facility is installed in the z/Architecture architectural mode. ---> handled by SIE 52 The interlocked-access facility 2 is installed. ---> handled by SIE 53 The load/store-on-condition facility 2 and load-and- zero-rightmost-byte facility are installed in the z/Architecture architectural mode. ---> handled by SIE 57 The message-security-assist-extension-5 facility is installed in the z/Architecture architectural mode. ---> handled by SIE 66 The reset-reference-bits-multiple facility is installed in the z/Architecture architectural mode. ---> handled by SIE. KVM will retry SIE 80 The decimal-floating-point packed-conversion facility is installed in the z/Architecture architectural mode. ---> handled by SIE Signed-off-by:
Michael Mueller <mimu@linux.vnet.ibm.com> Acked-by:
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David Hildenbrand authored
If the PER-3 facility is installed, the breaking-event address is to be stored in the low core. There is no facility bit for PER-3 in stfl(e) and Linux always uses the value at address 272 no matter if PER-3 is available or not. We can't hide its existence from the guest. All program interrupts injected via the SIE automatically store this information if the PER-3 facility is available in the hypervisor. Also the itdb contains the address automatically. As there is no switch to turn this mechanism off, let's simply make it consistent and also store the breaking event address in case of manual program interrupt injection. Reviewed-by:
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- 17 Mar, 2015 11 commits
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Michael Mueller authored
The patch represents capability KVM_CAP_S390_VECTOR_REGISTERS by means of the SIMD facility bit. This allows to a) disable the use of SIMD when used in conjunction with a not-SIMD-aware QEMU, b) to enable SIMD when used with a SIMD-aware version of QEMU and c) finally by means of a QEMU version using the future cpu model ioctls. Signed-off-by:
Eric Farman <farman@linux.vnet.ibm.com> Tested-by:
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Michael Mueller authored
Setting the SIMD bit in the KVM mask is an issue because it makes the facility visible but not usable to the guest, thus it needs to be removed again. Signed-off-by:
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Jason J. Herne authored
Provide the KVM_S390_GET_SKEYS and KVM_S390_SET_SKEYS ioctl which can be used to get/set guest storage keys. This functionality is needed for live migration of s390 guests that use storage keys. Signed-off-by:
Jason J. Herne <jjherne@linux.vnet.ibm.com> Reviewed-by:
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Ekaterina Tumanova authored
The Store System Information (STSI) instruction currently collects all information it relays to the caller in the kernel. Some information, however, is only available in user space. An example of this is the guest name: The kernel always sets "KVMGuest", but user space knows the actual guest name. This patch introduces a new exit, KVM_EXIT_S390_STSI, guarded by a capability that can be enabled by user space if it wants to be able to insert such data. User space will be provided with the target buffer and the requested STSI function code. Reviewed-by:
Ekaterina Tumanova <tumanova@linux.vnet.ibm.com> Signed-off-by:
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Thomas Huth authored
On s390, we've got to make sure to hold the IPTE lock while accessing logical memory. So let's add an ioctl for reading and writing logical memory to provide this feature for userspace, too. The maximum transfer size of this call is limited to 64kB to prevent that the guest can trigger huge copy_from/to_user transfers. QEMU currently only requests up to one or two pages so far, so 16*4kB seems to be a reasonable limit here. Signed-off-by:
Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by:
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Alexander Yarygin authored
Access register mode is one of the modes that control dynamic address translation. In this mode the address space is specified by values of the access registers. The effective address-space-control element is obtained from the result of the access register translation. See the "Access-Register Introduction" section of the chapter 5 "Program Execution" in "Principles of Operations" for more details. Signed-off-by:
Alexander Yarygin <yarygin@linux.vnet.ibm.com> Reviewed-by:
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Alexander Yarygin authored
During dynamic address translation the get_vcpu_asce() function can be invoked several times. It's ok for usual modes, but will be slow if CPUs are in AR mode. Let's call the get_vcpu_asce() once and pass the result to the called functions. Signed-off-by:
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Alexander Yarygin authored
In access register mode, the write_guest() read_guest() and other functions will invoke the access register translation, which requires an ar, designated by one of the instruction fields. Signed-off-by:
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Alexander Yarygin authored
The kvm_s390_check_low_addr_protection() function is used only with real addresses. According to the POP (the "Low-Address Protection" paragraph in chapter 3), if the effective address is real or absolute, the low-address protection procedure should raise a PROTECTION exception only when the low-address protection is enabled in the control register 0 and the address is low. This patch removes ASCE checks from the function and renames it to better reflect its behavior. Cc: Thomas Huth <thuth@linux.vnet.ibm.com> Signed-off-by:
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Dominik Dingel authored
As all cleanup functions can handle their respective NULL case there is no need to have more than one error jump label. Signed-off-by:
Dominik Dingel <dingel@linux.vnet.ibm.com> Acked-by:
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Geert Uytterhoeven authored
Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Message-Id: <1425932832-6244-1-git-send-email-geert+renesas@glider.be> Signed-off-by:
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- 06 Mar, 2015 15 commits
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Eric Farman authored
We finally have all the pieces in place, so let's include the vector facility bit in the mask of available hardware facilities for the guest to recognize. Also, enable the vector functionality in the guest control blocks, to avoid a possible vector data exception that would otherwise occur when a vector instruction is issued by the guest operating system. Signed-off-by:
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Eric Farman authored
Store additional status in the machine check handler, in order to collect status (such as vector registers) that is not defined by store status. Signed-off-by:
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Eric Farman authored
The new SIGP order Store Additional Status at Address is totally handled by user space, but we should still record the occurrence of this order in the kernel code. Signed-off-by:
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Eric Farman authored
A new exception type for vector instructions is introduced with the new processor, but is handled exactly like a Data Exception which is already handled by the system. Signed-off-by:
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Eric Farman authored
Define and allocate space for both the host and guest views of the vector registers for a given vcpu. The 32 vector registers occupy 128 bits each (512 bytes total), but architecturally are paired with 512 additional bytes of reserved space for future expansion. The kvm_sync_regs structs containing the registers are union'ed with 1024 bytes of padding in the common kvm_run struct. The addition of 1024 bytes of new register information clearly exceeds the existing union, so an expansion of that padding is required. When changing environments, we need to appropriately save and restore the vector registers viewed by both the host and guest, into and out of the sync_regs space. The floating point registers overlay the upper half of vector registers 0-15, so there's a bit of data duplication here that needs to be carefully avoided. Signed-off-by:
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Alexander Yarygin authored
The guest debug functions work on absolute addresses and should use the read_guest_abs() function rather than general read_guest() that works with logical addresses. Cc: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by:
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David Hildenbrand authored
trace-cmd fails to parse the instruction interception trace point: "Error: expected type 5 but read 4 failed to read event print fmt for kvm_s390_intercept_instruction" The result is an unformatted string in the output, with a warning: "kvm_s390_intercept_instruction: [FAILED TO PARSE]..." So let's add parentheses around the instruction parser macro to fix the format parsing. Acked-by:
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Yannick Guerrini authored
Change 'architecuture' to 'architecture' Signed-off-by:
Yannick Guerrini <yguerrini@tomshardware.fr> Message-Id: <1424989004-14412-1-git-send-email-yguerrini@tomshardware.fr> Signed-off-by:
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Michael Mueller authored
The function kvm_s390_vcpu_setup_model() now performs all cpu model realated setup tasks for a vcpu. Besides cpuid and ibc initialization, facility list assignment takes place during the setup step as well. The model setup has been pulled to the begin of vcpu setup to allow kvm facility tests. There is no need to protect the cpu model setup with a lock since the attributes can't be changed anymore as soon the first vcpu is online. Signed-off-by:
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Thomas Huth authored
The common s390 function insn_length() results in slightly smaller (and thus hopefully faster) code than the calculation of the instruction length via a lookup-table. So let's use that function in the interrupt delivery code, too. Signed-off-by:
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Thomas Huth authored
When the SIE exited by a DAT access exceptions which we can not resolve, the guest tried to access a page which is out of bounds and can not be paged-in. In this case we have to signal the bad access by injecting an address exception. However, address exceptions are either suppressing or terminating, i.e. the PSW has to point to the next instruction when the exception is delivered. Since the originating DAT access exception is nullifying, the PSW still points to the offending instruction instead, so we've got to forward the PSW to the next instruction. Having fixed this issue, we can now also enable the TPROT interpretation facility again which had been disabled because of this problem. Signed-off-by:
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Thomas Huth authored
When certain program exceptions (e.g. DAT access exceptions) occur, the current instruction has to be nullified, i.e. the old PSW that gets written into the low-core has to point to the beginning of the instruction again, and not to the beginning of the next instruction. Thus we have to rewind the PSW before writing it into the low-core. The list of nullifying exceptions can be found in the POP, chapter 6, figure 6-1 ("Interruption Action"). Signed-off-by: -
David Hildenbrand authored
The reinjection of an I/O interrupt can fail if the list is at the limit and between the dequeue and the reinjection, another I/O interrupt is injected (e.g. if user space floods kvm with I/O interrupts). This patch avoids this memory leak and returns -EFAULT in this special case. This error is not recoverable, so let's fail hard. This can later be avoided by not dequeuing the interrupt but working directly on the locked list. Signed-off-by:
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David Hildenbrand authored
If the I/O interrupt could not be written to the guest provided area (e.g. access exception), a program exception was injected into the guest but "inti" wasn't freed, therefore resulting in a memory leak. In addition, the I/O interrupt wasn't reinjected. Therefore the dequeued interrupt is lost. This patch fixes the problem while cleaning up the function and making the cc and rc logic easier to handle. Signed-off-by:
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Ekaterina Tumanova authored
s390 documentation requires words 0 and 10-15 to be reserved and stored as zeros. As we fill out all other fields, we can memset the full structure. Signed-off-by:
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- 04 Mar, 2015 4 commits
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Michael Mueller authored
With patch "include guest facilities in kvm facility test" it is no longer necessary to have special handling for the non-LPAR case. Signed-off-by:
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Michael Mueller authored
Most facility related decisions in KVM have to take into account: - the facilities offered by the underlying run container (LPAR/VM) - the facilities supported by the KVM code itself - the facilities requested by a guest VM This patch adds the KVM driver requested facilities to the test routine. It additionally renames struct s390_model_fac to kvm_s390_fac and its field names to be more meaningful. The semantics of the facilities stored in the KVM architecture structure is changed. The address arch.model.fac->list now points to the guest facility list and arch.model.fac->mask points to the KVM facility mask. This patch fixes the behaviour of KVM for some facilities for guests that ignore the guest visible facility bits, e.g. guests could use transactional memory intructions on hosts supporting them even if the chosen cpu model would not offer them. The userspace interface is not affected by this change. Signed-off-by:
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Michael Mueller authored
The facility lists were not fully copied. Signed-off-by:
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Christian Borntraeger authored
Under z/VM PQAP might trigger an operation exception if no crypto cards are defined via APVIRTUAL or APDEDICATED. [ 386.098666] Kernel BUG at 0000000000135c56 [verbose debug info unavailable] [ 386.098693] illegal operation: 0001 ilc:2 [#1] SMP [...] [ 386.098751] Krnl PSW : 0704c00180000000 0000000000135c56 (kvm_s390_apxa_installed+0x46/0x98) [...] [ 386.098804] [<000000000013627c>] kvm_arch_init_vm+0x29c/0x358 [ 386.098806] [<000000000012d008>] kvm_dev_ioctl+0xc0/0x460 [ 386.098809] [<00000000002c639a>] do_vfs_ioctl+0x332/0x508 [ 386.098811] [<00000000002c660e>] SyS_ioctl+0x9e/0xb0 [ 386.098814] [<000000000070476a>] system_call+0xd6/0x258 [ 386.098815] [<000003fffc7400a2>] 0x3fffc7400a2 Lets add an extable entry and provide a zeroed config in that case. Reported-by:
Stefan Zimmermann <stzi@linux.vnet.ibm.com> Signed-off-by:
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- 03 Mar, 2015 1 commit
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Tony Krowiak authored
z/VM and LPAR enable key wrapping by default, lets do the same on KVM. Signed-off-by:
Tony Krowiak <akrowiak@linux.vnet.ibm.com> Signed-off-by:
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- 23 Feb, 2015 1 commit
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Linus Torvalds authored
.. after extensive statistical analysis of my G+ polling, I've come to the inescapable conclusion that internet polls are bad. Big surprise. But "Hurr durr I'ma sheep" trounced "I like online polls" by a 62-to-38% margin, in a poll that people weren't even supposed to participate in. Who can argue with solid numbers like that? 5,796 votes from people who can't even follow the most basic directions? In contrast, "v4.0" beat out "v3.20" by a slimmer margin of 56-to-44%, but with a total of 29,110 votes right now. Now, arguably, that vote spread is only about 3,200 votes, which is less than the almost six thousand votes that the "please ignore" poll got, so it could be considered noise. But hey, I asked, so I'll honor the votes.
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