1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2019 Arm Ltd.
4 #include <linux/arm-smccc.h>
5 #include <linux/kvm_host.h>
7 #include <asm/kvm_mmu.h>
8 #include <asm/pvclock-abi.h>
10 #include <kvm/arm_hypercalls.h>
12 void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
14 struct kvm *kvm = vcpu->kvm;
19 u64 base = vcpu->arch.steal.base;
21 if (base == GPA_INVALID)
24 /* Let's do the local bookkeeping */
25 steal = vcpu->arch.steal.steal;
26 steal += current->sched_info.run_delay - vcpu->arch.steal.last_steal;
27 vcpu->arch.steal.last_steal = current->sched_info.run_delay;
28 vcpu->arch.steal.steal = steal;
30 steal_le = cpu_to_le64(steal);
31 idx = srcu_read_lock(&kvm->srcu);
32 offset = offsetof(struct pvclock_vcpu_stolen_time, stolen_time);
33 kvm_put_guest(kvm, base + offset, steal_le, u64);
34 srcu_read_unlock(&kvm->srcu, idx);
37 long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu)
39 u32 feature = smccc_get_arg1(vcpu);
40 long val = SMCCC_RET_NOT_SUPPORTED;
43 case ARM_SMCCC_HV_PV_TIME_FEATURES:
44 case ARM_SMCCC_HV_PV_TIME_ST:
45 val = SMCCC_RET_SUCCESS;
52 gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
54 struct pvclock_vcpu_stolen_time init_values = {};
55 struct kvm *kvm = vcpu->kvm;
56 u64 base = vcpu->arch.steal.base;
59 if (base == GPA_INVALID)
63 * Start counting stolen time from the time the guest requests
64 * the feature enabled.
66 vcpu->arch.steal.steal = 0;
67 vcpu->arch.steal.last_steal = current->sched_info.run_delay;
69 idx = srcu_read_lock(&kvm->srcu);
70 kvm_write_guest(kvm, base, &init_values, sizeof(init_values));
71 srcu_read_unlock(&kvm->srcu, idx);
76 int kvm_arm_pvtime_set_attr(struct kvm_vcpu *vcpu,
77 struct kvm_device_attr *attr)
79 u64 __user *user = (u64 __user *)attr->addr;
80 struct kvm *kvm = vcpu->kvm;
85 if (attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
88 if (get_user(ipa, user))
90 if (!IS_ALIGNED(ipa, 64))
92 if (vcpu->arch.steal.base != GPA_INVALID)
95 /* Check the address is in a valid memslot */
96 idx = srcu_read_lock(&kvm->srcu);
97 if (kvm_is_error_hva(gfn_to_hva(kvm, ipa >> PAGE_SHIFT)))
99 srcu_read_unlock(&kvm->srcu, idx);
102 vcpu->arch.steal.base = ipa;
107 int kvm_arm_pvtime_get_attr(struct kvm_vcpu *vcpu,
108 struct kvm_device_attr *attr)
110 u64 __user *user = (u64 __user *)attr->addr;
113 if (attr->attr != KVM_ARM_VCPU_PVTIME_IPA)
116 ipa = vcpu->arch.steal.base;
118 if (put_user(ipa, user))
123 int kvm_arm_pvtime_has_attr(struct kvm_vcpu *vcpu,
124 struct kvm_device_attr *attr)
126 switch (attr->attr) {
127 case KVM_ARM_VCPU_PVTIME_IPA: