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authorThomas Huth <thuth@linux.vnet.ibm.com>2013-09-12 10:33:48 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2013-09-24 19:12:21 +0200
commitaca84241b576044de68da9ca7e5cfa9c9bf9867b (patch)
tree057f12b7d19a58d23b38e1d5ffacc1e43b7417a1 /arch/s390/kvm
parent732e563373ffc57d38a8a3b6d55f2de865182117 (diff)
downloadop-kernel-dev-aca84241b576044de68da9ca7e5cfa9c9bf9867b.zip
op-kernel-dev-aca84241b576044de68da9ca7e5cfa9c9bf9867b.tar.gz
KVM: s390: Implement TEST BLOCK
This patch provides a simple version for the mandatory TEST BLOCK instruction interception, so that guests that use this instruction do not crash anymore. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/priv.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 59200ee..6f95994 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -128,6 +128,33 @@ static int handle_skey(struct kvm_vcpu *vcpu)
return 0;
}
+static int handle_test_block(struct kvm_vcpu *vcpu)
+{
+ unsigned long hva;
+ gpa_t addr;
+ int reg2;
+
+ if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
+ return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+
+ kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
+ addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
+ addr = kvm_s390_real_to_abs(vcpu, addr);
+
+ hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
+ if (kvm_is_error_hva(hva))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ /*
+ * We don't expect errors on modern systems, and do not care
+ * about storage keys (yet), so let's just clear the page.
+ */
+ if (clear_user((void __user *)hva, PAGE_SIZE) != 0)
+ return -EFAULT;
+ kvm_s390_set_psw_cc(vcpu, 0);
+ vcpu->run->s.regs.gprs[0] = 0;
+ return 0;
+}
+
static int handle_tpi(struct kvm_vcpu *vcpu)
{
struct kvm_s390_interrupt_info *inti;
@@ -444,6 +471,7 @@ static const intercept_handler_t b2_handlers[256] = {
[0x29] = handle_skey,
[0x2a] = handle_skey,
[0x2b] = handle_skey,
+ [0x2c] = handle_test_block,
[0x30] = handle_io_inst,
[0x31] = handle_io_inst,
[0x32] = handle_io_inst,
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