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| author | Thomas Huth <thuth@linux.vnet.ibm.com> | 2013-09-12 10:33:48 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-09-24 19:12:21 +0200 |
| commit | aca84241b576044de68da9ca7e5cfa9c9bf9867b (patch) | |
| tree | 057f12b7d19a58d23b38e1d5ffacc1e43b7417a1 /arch/s390 | |
| parent | KVM: s390: Helper for converting real addresses to absolute (diff) | |
| download | linux-aca84241b576044de68da9ca7e5cfa9c9bf9867b.tar.xz linux-aca84241b576044de68da9ca7e5cfa9c9bf9867b.zip | |
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')
| -rw-r--r-- | arch/s390/kvm/priv.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 59200ee275e5..6f9599416bae 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, ®2); + 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, |