diff options
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 65 |
1 files changed, 53 insertions, 12 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index f4d56e9939c9..c18b21d6991c 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -15,6 +15,7 @@ #include <linux/compiler.h> #include <linux/err.h> #include <linux/fs.h> +#include <linux/hrtimer.h> #include <linux/init.h> #include <linux/kvm.h> #include <linux/kvm_host.h> @@ -195,6 +196,10 @@ out_nokvm: void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { VCPU_EVENT(vcpu, 3, "%s", "free cpu"); + if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda == + (__u64) vcpu->arch.sie_block) + vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0; + smp_mb(); free_page((unsigned long)(vcpu->arch.sie_block)); kvm_vcpu_uninit(vcpu); kfree(vcpu); @@ -283,8 +288,10 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) vcpu->arch.sie_block->gmsor = vcpu->kvm->arch.guest_origin; vcpu->arch.sie_block->ecb = 2; vcpu->arch.sie_block->eca = 0xC1002001U; - setup_timer(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup, - (unsigned long) vcpu); + hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); + tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet, + (unsigned long) vcpu); + vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; get_cpu_id(&vcpu->arch.cpu_id); vcpu->arch.cpu_id.version = 0xff; return 0; @@ -307,19 +314,21 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, vcpu->arch.sie_block->icpua = id; BUG_ON(!kvm->arch.sca); - BUG_ON(kvm->arch.sca->cpu[id].sda); - kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block; + if (!kvm->arch.sca->cpu[id].sda) + kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block; + else + BUG_ON(!kvm->vcpus[id]); /* vcpu does already exist */ vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32); vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; spin_lock_init(&vcpu->arch.local_int.lock); INIT_LIST_HEAD(&vcpu->arch.local_int.list); vcpu->arch.local_int.float_int = &kvm->arch.float_int; - spin_lock_bh(&kvm->arch.float_int.lock); + spin_lock(&kvm->arch.float_int.lock); kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int; init_waitqueue_head(&vcpu->arch.local_int.wq); vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags; - spin_unlock_bh(&kvm->arch.float_int.lock); + spin_unlock(&kvm->arch.float_int.lock); rc = kvm_vcpu_init(vcpu, kvm, id); if (rc) @@ -478,6 +487,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) vcpu_load(vcpu); + /* verify, that memory has been registered */ + if (!vcpu->kvm->arch.guest_memsize) { + vcpu_put(vcpu); + return -EINVAL; + } + if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); @@ -497,7 +512,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) BUG(); } - might_sleep(); + might_fault(); do { __vcpu_run(vcpu); @@ -657,6 +672,8 @@ int kvm_arch_set_memory_region(struct kvm *kvm, struct kvm_memory_slot old, int user_alloc) { + int i; + /* A few sanity checks. We can have exactly one memory slot which has to start at guest virtual zero and which has to be located at a page boundary in userland and which has to end at a page boundary. @@ -664,7 +681,7 @@ int kvm_arch_set_memory_region(struct kvm *kvm, vmas. It is okay to mmap() and munmap() stuff in this slot after doing this call at any time */ - if (mem->slot) + if (mem->slot || kvm->arch.guest_memsize) return -EINVAL; if (mem->guest_phys_addr) @@ -676,15 +693,39 @@ int kvm_arch_set_memory_region(struct kvm *kvm, if (mem->memory_size & (PAGE_SIZE - 1)) return -EINVAL; + if (!user_alloc) + return -EINVAL; + + /* lock all vcpus */ + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + if (!kvm->vcpus[i]) + continue; + if (!mutex_trylock(&kvm->vcpus[i]->mutex)) + goto fail_out; + } + kvm->arch.guest_origin = mem->userspace_addr; kvm->arch.guest_memsize = mem->memory_size; - /* FIXME: we do want to interrupt running CPUs and update their memory - configuration now to avoid race conditions. But hey, changing the - memory layout while virtual CPUs are running is usually bad - programming practice. */ + /* update sie control blocks, and unlock all vcpus */ + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + if (kvm->vcpus[i]) { + kvm->vcpus[i]->arch.sie_block->gmsor = + kvm->arch.guest_origin; + kvm->vcpus[i]->arch.sie_block->gmslm = + kvm->arch.guest_memsize + + kvm->arch.guest_origin + + VIRTIODESCSPACE - 1ul; + mutex_unlock(&kvm->vcpus[i]->mutex); + } + } return 0; + +fail_out: + for (; i >= 0; i--) + mutex_unlock(&kvm->vcpus[i]->mutex); + return -EINVAL; } void kvm_arch_flush_shadow(struct kvm *kvm) |