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KVM: s390: Add skey emulation fault handling

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When doing skey emulation for huge guests, we now need to fault in
pmds, as we don't have PGSTES anymore to store them when we do not
have valid table entries.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
This commit is contained in:
Janosch Frank
2018-07-18 13:40:22 +01:00
parent 637ff9efe5
commit bd096f6443
2 changed files with 83 additions and 37 deletions
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15
arch/s390/kvm/kvm-s390.c
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@@ -1551,6 +1551,7 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
uint8_t *keys;
uint64_t hva;
int srcu_idx, i, r = 0;
bool unlocked;
if (args->flags != 0)
return -EINVAL;
@@ -1575,9 +1576,11 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
if (r)
goto out;
i = 0;
down_read(&current->mm->mmap_sem);
srcu_idx = srcu_read_lock(&kvm->srcu);
for (i = 0; i < args->count; i++) {
while (i < args->count) {
unlocked = false;
hva = gfn_to_hva(kvm, args->start_gfn + i);
if (kvm_is_error_hva(hva)) {
r = -EFAULT;
@@ -1591,8 +1594,14 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
}
r = set_guest_storage_key(current->mm, hva, keys[i], 0);
if (r)
break;
if (r) {
r = fixup_user_fault(current, current->mm, hva,
FAULT_FLAG_WRITE, &unlocked);
if (r)
break;
}
if (!r)
i++;
}
srcu_read_unlock(&kvm->srcu, srcu_idx);
up_read(&current->mm->mmap_sem);