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Diffstat (limited to 'arch/s390/kvm/priv.c')
-rw-r--r--arch/s390/kvm/priv.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 73c47bd95db3..391626361084 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -326,3 +326,52 @@ int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
326 } 326 }
327 return -EOPNOTSUPP; 327 return -EOPNOTSUPP;
328} 328}
329
330static int handle_tprot(struct kvm_vcpu *vcpu)
331{
332 int base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
333 int disp1 = (vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16;
334 int base2 = (vcpu->arch.sie_block->ipb & 0xf000) >> 12;
335 int disp2 = vcpu->arch.sie_block->ipb & 0x0fff;
336 u64 address1 = disp1 + base1 ? vcpu->arch.guest_gprs[base1] : 0;
337 u64 address2 = disp2 + base2 ? vcpu->arch.guest_gprs[base2] : 0;
338 struct vm_area_struct *vma;
339
340 vcpu->stat.instruction_tprot++;
341
342 /* we only handle the Linux memory detection case:
343 * access key == 0
344 * guest DAT == off
345 * everything else goes to userspace. */
346 if (address2 & 0xf0)
347 return -EOPNOTSUPP;
348 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
349 return -EOPNOTSUPP;
350
351
352 down_read(&current->mm->mmap_sem);
353 vma = find_vma(current->mm,
354 (unsigned long) __guestaddr_to_user(vcpu, address1));
355 if (!vma) {
356 up_read(&current->mm->mmap_sem);
357 return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
358 }
359
360 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
361 if (!(vma->vm_flags & VM_WRITE) && (vma->vm_flags & VM_READ))
362 vcpu->arch.sie_block->gpsw.mask |= (1ul << 44);
363 if (!(vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_READ))
364 vcpu->arch.sie_block->gpsw.mask |= (2ul << 44);
365
366 up_read(&current->mm->mmap_sem);
367 return 0;
368}
369
370int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
371{
372 /* For e5xx... instructions we only handle TPROT */
373 if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
374 return handle_tprot(vcpu);
375 return -EOPNOTSUPP;
376}
377