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2017-02-16ptp_kvm: try to detect hypercall availabilityRadim Krčmář1-0/+7
No point in registering the device if it cannot work. The hypercall does not advertise itself, so we have to call it. Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15KVM: svm: inititalize hash table structures directlyDavid Hildenbrand1-4/+2
The hashtable and guarding spinlock are global data structures, we can inititalize them statically. Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20170124212116.4568-1-david@redhat.com> Reviewed-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: Refactor nested_vmx_run()Jim Mattson1-49/+62
Nested_vmx_run is split into two parts: the part that handles the VMLAUNCH/VMRESUME instruction, and the part that modifies the vcpu state to transition from VMX root mode to VMX non-root mode. The latter will be used when restoring the checkpointed state of a vCPU that was in VMX operation when a snapshot was taken. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: Split VMCS checks from nested_vmx_run()Jim Mattson1-91/+103
The checks performed on the contents of the vmcs12 are extracted from nested_vmx_run so that they can be used to validate a vmcs12 that has been restored from a checkpoint. Signed-off-by: Jim Mattson <jmattson@google.com> [Change prepare_vmcs02 and nested_vmx_load_cr3's last argument to u32, to match check_vmentry_postreqs. Update comments for singlestep handling. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: Refactor nested_get_vmcs12_pages()Jim Mattson1-69/+69
Perform the checks on vmcs12 state early, but defer the gpa->hpa lookups until after prepare_vmcs02. Later, when we restore the checkpointed state of a vCPU in guest mode, we will not be able to do the gpa->hpa lookups when the restore is done. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: Refactor handle_vmptrld()Jim Mattson1-9/+13
Handle_vmptrld is split into two parts: the part that handles the VMPTRLD instruction, and the part that establishes the current VMCS pointer. The latter will be used when restoring the checkpointed state of a vCPU that had a valid VMCS pointer when a snapshot was taken. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: Refactor handle_vmon()Jim Mattson1-41/+52
Handle_vmon is split into two parts: the part that handles the VMXON instruction, and the part that modifies the vcpu state to transition from legacy mode to VMX operation. The latter will be used when restoring the checkpointed state of a vCPU that was in VMX operation when a snapshot was taken. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: Prepare for checkpointing L2 stateJim Mattson1-29/+48
Split prepare_vmcs12 into two parts: the part that stores the current L2 guest state and the part that sets up the exit information fields. The former will be used when checkpointing the vCPU's VMX state. Modify prepare_vmcs02 so that it can construct a vmcs02 midway through L2 execution, using the checkpointed L2 guest state saved into the cached vmcs12 above. Signed-off-by: Jim Mattson <jmattson@google.com> [Rebasing: add from_vmentry argument to prepare_vmcs02 instead of using vmx->nested.nested_run_pending, because it is no longer 1 at the point prepare_vmcs02 is called. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: x86: do not use KVM_REQ_EVENT for APICv interrupt injectionPaolo Bonzini3-29/+34
Since bf9f6ac8d749 ("KVM: Update Posted-Interrupts Descriptor when vCPU is blocked", 2015-09-18) the posted interrupt descriptor is checked unconditionally for PIR.ON. Therefore we don't need KVM_REQ_EVENT to trigger the scan and, if NMIs or SMIs are not involved, we can avoid the complicated event injection path. Calling kvm_vcpu_kick if PIR.ON=1 is also useless, though it has been there since APICv was introduced. However, without the KVM_REQ_EVENT safety net KVM needs to be much more careful about races between vmx_deliver_posted_interrupt and vcpu_enter_guest. First, the IPI for posted interrupts may be issued between setting vcpu->mode = IN_GUEST_MODE and disabling interrupts. If that happens, kvm_trigger_posted_interrupt returns true, but smp_kvm_posted_intr_ipi doesn't do anything about it. The guest is entered with PIR.ON, but the posted interrupt IPI has not been sent and the interrupt is only delivered to the guest on the next vmentry (if any). To fix this, disable interrupts before setting vcpu->mode. This ensures that the IPI is delayed until the guest enters non-root mode; it is then trapped by the processor causing the interrupt to be injected. Second, the IPI may be issued between kvm_x86_ops->sync_pir_to_irr(vcpu) and vcpu->mode = IN_GUEST_MODE. In this case, kvm_vcpu_kick is called but it (correctly) doesn't do anything because it sees vcpu->mode == OUTSIDE_GUEST_MODE. Again, the guest is entered with PIR.ON but no posted interrupt IPI is pending; this time, the fix for this is to move the RVI update after IN_GUEST_MODE. Both issues were mostly masked by the liberal usage of KVM_REQ_EVENT, though the second could actually happen with VT-d posted interrupts. In both race scenarios KVM_REQ_EVENT would cancel guest entry, resulting in another vmentry which would inject the interrupt. This saves about 300 cycles on the self_ipi_* tests of vmexit.flat. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15KVM: x86: do not scan IRR twice on APICv vmentryPaolo Bonzini5-28/+28
Calls to apic_find_highest_irr are scanning IRR twice, once in vmx_sync_pir_from_irr and once in apic_search_irr. Change sync_pir_from_irr to get the new maximum IRR from kvm_apic_update_irr; now that it does the computation, it can also do the RVI write. In order to avoid complications in svm.c, make the callback optional. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15KVM: vmx: move sync_pir_to_irr from apic_find_highest_irr to callersPaolo Bonzini2-4/+7
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15KVM: x86: preparatory changes for APICv cleanupsPaolo Bonzini3-26/+35
Add return value to __kvm_apic_update_irr/kvm_apic_update_irr. Move vmx_sync_pir_to_irr around. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: nVMX: move nested events check to kvm_vcpu_runningPaolo Bonzini1-3/+3
vcpu_run calls kvm_vcpu_running, not kvm_arch_vcpu_runnable, and the former does not call check_nested_events. Once KVM_REQ_EVENT is removed from the APICv interrupt injection path, however, this would leave no place to trigger a vmexit from L2 to L1, causing a missed interrupt delivery while in guest mode. This is caught by the "ack interrupt on exit" test in vmx.flat. [This does not change the calls to check_nested_events in inject_pending_event. That is material for a separate cleanup.] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15KVM: vmx: clear pending interrupts on KVM_SET_LAPICPaolo Bonzini2-2/+10
Pending interrupts might be in the PI descriptor when the LAPIC is restored from an external state; we do not want them to be injected. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15kvm: vmx: Use the hardware provided GPA instead of page walkPaolo Bonzini1-0/+3
As in the SVM patch, the guest physical address is passed by VMX to x86_emulate_instruction already, so mark the GPA as available in vcpu->arch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-15Merge branch 'kvm-ppc-next' of ↵Paolo Bonzini9-87/+56
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD This brings in two fixes for potential host crashes, from Ben Herrenschmidt and Nick Piggin.
2017-02-09KVM: x86: hide KVM_HC_CLOCK_PAIRING on 32 bitArnd Bergmann1-0/+4
The newly added hypercall doesn't work on x86-32: arch/x86/kvm/x86.c: In function 'kvm_pv_clock_pairing': arch/x86/kvm/x86.c:6163:6: error: implicit declaration of function 'kvm_get_walltime_and_clockread';did you mean 'kvm_get_time_scale'? [-Werror=implicit-function-declaration] This adds an #ifdef around it, matching the one around the related functions that are also only implemented on 64-bit systems. Fixes: 55dd00a73a51 ("KVM: x86: add KVM_HC_CLOCK_PAIRING hypercall") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-09Merge tag 'kvmarm-for-4.11' of ↵Paolo Bonzini295-1399/+3818
git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD kvmarm updates for 4.11 - GICv3 save restore - Cache flushing fixes - MSI injection fix for GICv3 ITS - Physical timer emulation support
2017-02-09KVM: PPC: Book 3S: Fix error return in kvm_vm_ioctl_create_spapr_tce()Wei Yongjun1-0/+1
Fix to return error code -ENOMEM from the memory alloc error handling case instead of 0, as done elsewhere in this function. Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2017-02-08PTP: add kvm PTP driverMarcelo Tosatti3-0/+213
Add a driver with gettime method returning hosts realtime clock. This allows Chrony to synchronize host and guest clocks with high precision (see results below). chronyc> sources MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== To configure Chronyd to use PHC refclock, add the following line to its configuration file: refclock PHC /dev/ptpX poll 3 dpoll -2 offset 0 Where /dev/ptpX is the kvmclock PTP clock. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-08kvmclock: export kvmclock clocksource and data pointersMarcelo Tosatti2-1/+10
To be used by KVM PTP driver. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-08KVM: arm/arm64: Emulate the EL1 phys timer registersJintack Lim3-4/+37
Emulate read and write operations to CNTP_TVAL, CNTP_CVAL and CNTP_CTL. Now VMs are able to use the EL1 physical timer. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm64: Add the EL1 physical timer access handlerJintack Lim1-0/+34
KVM traps on the EL1 phys timer accesses from VMs, but it doesn't handle those traps. This results in terminating VMs. Instead, set a handler for the EL1 phys timer access, and inject an undefined exception as an intermediate step. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Set up a background timer for the physical timer emulationJintack Lim1-1/+24
Set a background timer for the EL1 physical timer emulation while VMs are running, so that VMs get the physical timer interrupts in a timely manner. Schedule the background timer on entry to the VM and cancel it on exit. This would not have any performance impact to the guest OSes that currently use the virtual timer since the physical timer is always not enabled. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Set a background timer to the earliest timer expirationJintack Lim2-14/+42
When scheduling a background timer, consider both of the virtual and physical timer and pick the earliest expiration time. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Update the physical timer interrupt levelJintack Lim1-0/+4
Now that we maintain the EL1 physical timer register states of VMs, update the physical timer interrupt level along with the virtual one. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Initialize the emulated EL1 physical timerJintack Lim4-5/+25
Initialize the emulated EL1 physical timer with the default irq number. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Add the EL1 physical timer contextJintack Lim1-0/+2
Add the EL1 physical timer context. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Decouple kvm timer functions from virtual timerJintack Lim3-31/+27
Now that we have a separate structure for timer context, make functions generic so that they can work with any timer context, not just the virtual timer context. This does not change the virtual timer functionality. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Move cntvoff to each timer contextJintack Lim6-25/+32
Make cntvoff per each timer context. This is helpful to abstract kvm timer functions to work with timer context without considering timer types (e.g. physical timer or virtual timer). This also would pave the way for ever doing adjustments of the cntvoff on a per-CPU basis if that should ever make sense. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: Abstract virtual timer context into separate structureJintack Lim3-50/+56
Abstract virtual timer context into a separate structure and change all callers referring to timer registers, irq state and so on. No change in functionality. This is about to become very handy when adding the EL1 physical timer. Signed-off-by: Jintack Lim <jintack@cs.columbia.edu> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: arm/arm64: vgic: Stop injecting the MSI occurrence twiceShanker Donthineni1-0/+3
The IRQFD framework calls the architecture dependent function twice if the corresponding GSI type is edge triggered. For ARM, the function kvm_set_msi() is getting called twice whenever the IRQFD receives the event signal. The rest of the code path is trying to inject the MSI without any validation checks. No need to call the function vgic_its_inject_msi() second time to avoid an unnecessary overhead in IRQ queue logic. It also avoids the possibility of VM seeing the MSI twice. Simple fix, return -1 if the argument 'level' value is zero. Cc: stable@vger.kernel.org Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2017-02-08KVM: x86: fix compilationPaolo Bonzini1-1/+1
Fix rebase breakage from commit 55dd00a73a51 ("KVM: x86: add KVM_HC_CLOCK_PAIRING hypercall", 2017-01-24), courtesy of the "I could have sworn I had pushed the right branch" department. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-08Merge remote-tracking branch 'remotes/powerpc/topic/ppc-kvm' into kvm-ppc-nextPaul Mackerras8-87/+55
This merges in a fix which touches both PPC and KVM code, which was therefore put into a topic branch in the powerpc tree. Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2017-02-07Merge tag 'kvm-s390-next-4.11-2' of ↵Paolo Bonzini10-60/+225
git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD KVM: s390: Fixes and features for 4.11 (via kvm/next) - enable some simd extensions for guests - enable nx for guests - debug log for cpu model - PER fixes - remove bitwise annotation from ar_t - detect guests in operation exception program check loops - fix potential null-pointer dereference for ucontrol guests - also contains merge for fix that went into 4.10 to avoid conflicts
2017-02-07Merge tag 'kvm_mips_4.11_1' of ↵Paolo Bonzini22-1268/+2602
git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/kvm-mips into HEAD KVM: MIPS: GVA/GPA page tables, dirty logging, SYNC_MMU etc Numerous MIPS KVM fixes, improvements, and features for 4.11, many of which continue to pave the way for VZ support, the most interesting of which are: - Add GVA->HPA page tables for T&E, to cache GVA mappings. - Generate fast-path TLB refill exception handler which loads host TLB entries from GVA page table, avoiding repeated guest memory translation and guest TLB lookups. - Use uaccess macros when T&E needs to access guest memory, which with GVA page tables and the Linux TLB refill handler improves robustness against TLB faults and fixes EVA hosts. - Use BadInstr/BadInstrP registers when available to obtain instruction encodings after a synchronous trap. - Add GPA->HPA page tables to replace the inflexible linear array, allowing for multiple sparsely arranged memory regions. - Properly implement dirty page logging. - Add KVM_CAP_SYNC_MMU support so that changes in GPA mappings become effective in guests even if they are already running, allowing for copy-on-write, KSM, idle page tracking, swapping, and guest memory ballooning. - Add KVM_CAP_READONLY_MEM support, so writes to specified memory regions are treated as MMIO. - Implement proper CP0_EBase support in T&E. - Expose a few more missing CP0 registers to userland. - Add KVM_CAP_NR_VCPUS and KVM_CAP_MAX_VCPUS support, and allow up to 8 VCPUs to be created in a VM. - Various cleanups and dropping of dead and duplicated code.
2017-02-07Merge branch 'kvm-ppc-next' of ↵Paolo Bonzini36-563/+2608
git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD The big feature this time is support for POWER9 using the radix-tree MMU for host and guest. This required some changes to arch/powerpc code, so I talked with Michael Ellerman and he created a topic branch with this patchset, which I merged into kvm-ppc-next and which Michael will pull into his tree. Michael also put in some patches from Nick Piggin which fix bugs in the interrupt vector code in relocatable kernels when coming from a KVM guest. Other notable changes include: * Add the ability to change the size of the hashed page table, from David Gibson. * XICS (interrupt controller) emulation fixes and improvements, from Li Zhong. * Bug fixes from myself and Thomas Huth. These patches define some new KVM capabilities and ioctls, but there should be no conflicts with anything else currently upstream, as far as I am aware.
2017-02-07KVM: x86: add KVM_HC_CLOCK_PAIRING hypercallMarcelo Tosatti4-0/+112
Add a hypercall to retrieve the host realtime clock and the TSC value used to calculate that clock read. Used to implement clock synchronization between host and guest. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-07KVM: nVMX: vmx_complete_nested_posted_interrupt() can't failDavid Hildenbrand1-5/+5
vmx_complete_nested_posted_interrupt() can't fail, let's turn it into a void function. Signed-off-by: David Hildenbrand <david@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-07KVM: nVMX: kmap() can't failDavid Hildenbrand1-9/+0
kmap() can't fail, therefore it will always return a valid pointer. Let's just get rid of the unnecessary checks. Signed-off-by: David Hildenbrand <david@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-02-07powerpc/powernv: Remove separate entry for OPAL real mode callsBenjamin Herrenschmidt6-86/+46
All entry points already read the MSR so they can easily do the right thing. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-02-07powerpc/64: CONFIG_RELOCATABLE support for hmi interruptsNicholas Piggin2-1/+9
The branch from hmi_exception_early to hmi_exception_realmode must use a "relocatable-style" branch, because it is branching from unrelocated exception code to beyond __end_interrupts. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-02-06KVM: s390: detect some program check loopsChristian Borntraeger1-0/+21
Sometimes (e.g. early boot) a guest is broken in such ways that it loops 100% delivering operation exceptions (illegal operation) but the pgm new PSW is not set properly. This will result in code being read from address zero, which usually contains another illegal op. Let's detect this case and return to userspace. Instead of only detecting this for address zero apply a heuristic that will work for any program check new psw. We do not want guest problem state to be able to trigger a guest panic, e.g. by faulting on an address that is the same as the program check new PSW, so we check for the problem state bit being off. With proper handling in userspace we a: get rid of CPU consumption of such broken guests b: keep the program old PSW. This allows to find out the original illegal operation - making debugging such early boot issues much easier than with single stepping Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
2017-02-06KVM: s390: Disable dirty log retrieval for UCONTROL guestsJanosch Frank1-0/+3
User controlled KVM guests do not support the dirty log, as they have no single gmap that we can check for changes. As they have no single gmap, kvm->arch.gmap is NULL and all further referencing to it for dirty checking will result in a NULL dereference. Let's return -EINVAL if a caller tries to sync dirty logs for a UCONTROL guest. Fixes: 15f36eb ("KVM: s390: Add proper dirty bitmap support to S390 kvm.") Cc: <stable@vger.kernel.org> # 3.16+ Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com> Reported-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>
2017-02-03KVM: MIPS: Allow multiple VCPUs to be createdJames Hogan2-1/+7
Increase the maximum number of MIPS KVM VCPUs to 8, and implement the KVM_CAP_NR_VCPUS and KVM_CAP_MAX_CPUS capabilities which expose the recommended and maximum number of VCPUs to userland. The previous maximum of 1 didn't allow for any form of SMP guests. We calculate the values similarly to ARM, recommending as many VCPUs as there are CPUs online in the system. This will allow userland to know how many VCPUs it is possible to create. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
2017-02-03KVM: MIPS/T&E: Expose read-only CP0_IntCtl registerJames Hogan3-0/+9
Expose the CP0_IntCtl register through the KVM register access API, which is a required register since MIPS32r2. It is currently read-only since the VS field isn't implemented due to lack of Config3.VInt or Config3.VEIC. It is implemented in trap_emul.c so that a VZ implementation can allow writes. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
2017-02-03KVM: MIPS/T&E: Expose CP0_EntryLo0/1 registersJames Hogan3-0/+24
Expose the CP0_EntryLo0 and CP0_EntryLo1 registers through the KVM register access API. This is fairly straightforward for trap & emulate since we don't support the RI and XI bits. For the sake of future proofing (particularly for VZ) it is explicitly specified that the API always exposes the 64-bit version of these registers (i.e. with the RI and XI bits in bit positions 63 and 62 respectively), and they are implemented in trap_emul.c rather than mips.c to allow them to be implemented differently for VZ. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
2017-02-03KVM: MIPS/T&E: Default to reset vectorJames Hogan1-0/+6
Set the default VCPU state closer to the architectural reset state, with PC pointing at the reset vector (uncached PA 0x1fc00000, which for KVM T&E is VA 0x5fc00000), and with CP0_Status.BEV and CP0_Status.ERL to 1. Although QEMU at least will overwrite this state, it makes sense to do this now that CP0_EBase is properly implemented to check BEV, and now that we support a sparse GPA layout potentially with a boot ROM at GPA 0x1fc00000. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
2017-02-03KVM: MIPS/T&E: Implement CP0_EBase registerJames Hogan5-33/+61
The CP0_EBase register is a standard feature of MIPS32r2, so we should always have been implementing it properly. However the register value was ignored and wasn't exposed to userland. Fix the emulation of exceptions and interrupts to use the value stored in guest CP0_EBase, and fix the masks so that the top 3 bits (rather than the standard 2) are fixed, so that it is always in the guest KSeg0 segment. Also add CP0_EBASE to the KVM one_reg interface so it can be accessed by userland, also allowing the CPU number field to be written (which isn't permitted by the guest). Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
2017-02-03KVM: MIPS/T&E: Move CP0 register access into T&EJames Hogan4-203/+179
Access to various CP0 registers via the KVM register access API needs to be implementation specific to allow restrictions to be made on changes, for example when VZ guest registers aren't present, so move them all into trap_emul.c in preparation for VZ. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
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