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KVM: s390: index kvm->arch.idle_mask by vcpu_idx
While in practice vcpu->vcpu_idx == vcpu->vcp_id is often true, it may
not always be, and we must not rely on this. Reason is that KVM decides
the vcpu_idx, userspace decides the vcpu_id, thus the two might not
match.
Currently kvm->arch.idle_mask is indexed by vcpu_id, which implies
that code like
for_each_set_bit(vcpu_id, kvm->arch.idle_mask, online_vcpus) {
vcpu = kvm_get_vcpu(kvm, vcpu_id);
do_stuff(vcpu);
}
is not legit. Reason is that kvm_get_vcpu expects an vcpu_idx, not an
vcpu_id. The trouble is, we do actually use kvm->arch.idle_mask like
this. To fix this problem we have two options. Either use
kvm_get_vcpu_by_id(vcpu_id), which would loop to find the right vcpu_id,
or switch to indexing via vcpu_idx. The latter is preferable for obvious
reasons.
Let us make switch from indexing kvm->arch.idle_mask by vcpu_id to
indexing it by vcpu_idx. To keep gisa_int.kicked_mask indexed by the
same index as idle_mask lets make the same change for it as well.
Fixes: 1ee0bc559d
("KVM: s390: get rid of local_int array")
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Christian Bornträger <borntraeger@de.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: <stable@vger.kernel.org> # 3.15+
Link: https://lore.kernel.org/r/20210827125429.1912577-1-pasic@linux.ibm.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
parent
7119decf47
commit
a3e03bc136
4 changed files with 9 additions and 8 deletions
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@ -963,6 +963,7 @@ struct kvm_arch{
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atomic64_t cmma_dirty_pages;
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/* subset of available cpu features enabled by user space */
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DECLARE_BITMAP(cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
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/* indexed by vcpu_idx */
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DECLARE_BITMAP(idle_mask, KVM_MAX_VCPUS);
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struct kvm_s390_gisa_interrupt gisa_int;
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struct kvm_s390_pv pv;
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@ -419,13 +419,13 @@ static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
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static void __set_cpu_idle(struct kvm_vcpu *vcpu)
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{
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kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
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set_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
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set_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.idle_mask);
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}
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static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
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{
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kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
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clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
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clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.idle_mask);
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}
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static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
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@ -3050,18 +3050,18 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
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static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
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{
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int vcpu_id, online_vcpus = atomic_read(&kvm->online_vcpus);
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int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
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struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
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struct kvm_vcpu *vcpu;
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for_each_set_bit(vcpu_id, kvm->arch.idle_mask, online_vcpus) {
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vcpu = kvm_get_vcpu(kvm, vcpu_id);
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for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
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vcpu = kvm_get_vcpu(kvm, vcpu_idx);
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if (psw_ioint_disabled(vcpu))
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continue;
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deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
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if (deliverable_mask) {
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/* lately kicked but not yet running */
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if (test_and_set_bit(vcpu_id, gi->kicked_mask))
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if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
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return;
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kvm_s390_vcpu_wakeup(vcpu);
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return;
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@ -4026,7 +4026,7 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu)
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kvm_s390_patch_guest_per_regs(vcpu);
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}
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clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask);
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clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.gisa_int.kicked_mask);
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vcpu->arch.sie_block->icptcode = 0;
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cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
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@ -79,7 +79,7 @@ static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
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static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
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{
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return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
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return test_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.idle_mask);
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}
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static inline int kvm_is_ucontrol(struct kvm *kvm)
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