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: 1ee0bc559dc3 ("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>

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 118d545..611f18e 100644 (file)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -963,6 +963,7 @@ struct kvm_arch{
        atomic64_t cmma_dirty_pages;
        /* subset of available cpu features enabled by user space */
        DECLARE_BITMAP(cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
+       /* indexed by vcpu_idx */
        DECLARE_BITMAP(idle_mask, KVM_MAX_VCPUS);
        struct kvm_s390_gisa_interrupt gisa_int;
        struct kvm_s390_pv pv;

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index d548d60..16256e1 100644 (file)
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -419,13 +419,13 @@ static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
 {
        kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
-       set_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
+       set_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.idle_mask);
 }
 
 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
 {
        kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
-       clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
+       clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.idle_mask);
 }
 
 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
@@ -3050,18 +3050,18 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
 
 static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
 {
-       int vcpu_id, online_vcpus = atomic_read(&kvm->online_vcpus);
+       int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
        struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
        struct kvm_vcpu *vcpu;
 
-       for_each_set_bit(vcpu_id, kvm->arch.idle_mask, online_vcpus) {
-               vcpu = kvm_get_vcpu(kvm, vcpu_id);
+       for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
+               vcpu = kvm_get_vcpu(kvm, vcpu_idx);
                if (psw_ioint_disabled(vcpu))
                        continue;
                deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
                if (deliverable_mask) {
                        /* lately kicked but not yet running */
-                       if (test_and_set_bit(vcpu_id, gi->kicked_mask))
+                       if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
                                return;
                        kvm_s390_vcpu_wakeup(vcpu);
                        return;

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 5b45c83..e144c80 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4026,7 +4026,7 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu)
                kvm_s390_patch_guest_per_regs(vcpu);
        }
 
-       clear_bit(vcpu->vcpu_id, vcpu->kvm->arch.gisa_int.kicked_mask);
+       clear_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.gisa_int.kicked_mask);
 
        vcpu->arch.sie_block->icptcode = 0;
        cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);

diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 9fad251..ecd741e 100644 (file)
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -79,7 +79,7 @@ static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu)
 
 static inline int is_vcpu_idle(struct kvm_vcpu *vcpu)
 {
-       return test_bit(vcpu->vcpu_id, vcpu->kvm->arch.idle_mask);
+       return test_bit(kvm_vcpu_get_idx(vcpu), vcpu->kvm->arch.idle_mask);
 }
 
 static inline int kvm_is_ucontrol(struct kvm *kvm)