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Fri, 13 Sep 2024 11:52:57 +0000 (GMT) From: Christoph Schlameuss To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org, Paolo Bonzini , Shuah Khan , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , David Hildenbrand , Nina Schoetterl-Glausch , schlameuss@linux.ibm.com Subject: [PATCH v3 2/3] selftests: kvm: s390: Add uc_skey VM test case Date: Fri, 13 Sep 2024 13:52:47 +0200 Message-ID: <20240913115248.211071-3-schlameuss@linux.ibm.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240913115248.211071-1-schlameuss@linux.ibm.com> References: <20240913115248.211071-1-schlameuss@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ghsLZ6TA5SDLGD3F_DgC_arKzoFQ83oM X-Proofpoint-ORIG-GUID: uaP76Pgg_ch8Eq1ejuAPU7ZQWXoUCNYP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-13_09,2024-09-13_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=838 priorityscore=1501 adultscore=0 clxscore=1015 spamscore=0 bulkscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2408220000 definitions=main-2409130080 Add a test case manipulating s390 storage keys from within the ucontrol VM. Signed-off-by: Christoph Schlameuss --- .../selftests/kvm/s390x/ucontrol_test.c | 89 ++++++++++++++++++- 1 file changed, 88 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/s390x/ucontrol_test.c b/tools/testing/selftests/kvm/s390x/ucontrol_test.c index 084cea02c2fa..f6e3a68f89a9 100644 --- a/tools/testing/selftests/kvm/s390x/ucontrol_test.c +++ b/tools/testing/selftests/kvm/s390x/ucontrol_test.c @@ -79,6 +79,33 @@ asm("test_mem_asm:\n" " j 0b\n" ); +/* Test program manipulating storage keys */ +extern char test_skey_asm[]; +asm("test_skey_asm:\n" + "xgr %r0, %r0\n" + + "0:\n" + " ahi %r0,1\n" + " st %r1,0(%r5,%r6)\n" + + " iske %r1,%r6\n" + " ahi %r0,1\n" + " diag 0,0,0x44\n" + + " sske %r1,%r6\n" + " xgr %r1,%r1\n" + " iske %r1,%r6\n" + " ahi %r0,1\n" + " diag 0,0,0x44\n" + + " rrbe %r1,%r6\n" + " iske %r1,%r6\n" + " ahi %r0,1\n" + " diag 0,0,0x44\n" + + " j 0b\n" +); + FIXTURE(uc_kvm) { struct kvm_s390_sie_block *sie_block; @@ -299,8 +326,9 @@ static void uc_handle_exit_ucontrol(FIXTURE_DATA(uc_kvm) * self) } /* verify SIEIC exit - * * reset stop requests + * * handle expected interception codes * * fail on codes not expected in the test cases + * Returns if interception is handled / execution can be continued */ static bool uc_handle_sieic(FIXTURE_DATA(uc_kvm) * self) { @@ -317,6 +345,10 @@ static bool uc_handle_sieic(FIXTURE_DATA(uc_kvm) * self) /* end execution in caller on intercepted instruction */ pr_info("sie instruction interception\n"); return false; + case ICPT_KSS: + /* disable KSS and continue; KVM would init the skeys here */ + sie_block->cpuflags &= ~CPUSTAT_KSS; + return true; case ICPT_OPEREXC: /* operation exception */ TEST_FAIL("sie exception on %.4x%.8x", sie_block->ipa, sie_block->ipb); @@ -473,4 +505,59 @@ TEST_F(uc_kvm, uc_gprs) ASSERT_EQ(1, sync_regs->gprs[0]); } +TEST_F(uc_kvm, uc_skey) +{ + u64 test_vaddr = VM_MEM_SIZE - (SZ_1M / 2); + struct kvm_sync_regs *sync_regs = &self->run->s.regs; + struct kvm_run *run = self->run; + u8 skeyvalue = 0x34; + + /* copy test_skey_asm to code_hva / code_gpa */ + TH_LOG("copy code %p to vm mapped memory %p / %p", + &test_skey_asm, (void *)self->code_hva, (void *)self->code_gpa); + memcpy((void *)self->code_hva, &test_skey_asm, PAGE_SIZE); + + /* set register content for test_skey_asm to access not mapped memory */ + sync_regs->gprs[1] = skeyvalue; + sync_regs->gprs[5] = self->base_gpa; + sync_regs->gprs[6] = test_vaddr; + run->kvm_dirty_regs |= KVM_SYNC_GPRS; + + /* DAT disabled + 64 bit mode */ + run->psw_mask = 0x0000000180000000ULL; + run->psw_addr = self->code_gpa; + + ASSERT_EQ(0, uc_run_once(self)); + ASSERT_EQ(true, uc_handle_exit(self)); + ASSERT_EQ(1, sync_regs->gprs[0]); + + /* ISKE */ + ASSERT_EQ(0, uc_run_once(self)); + ASSERT_EQ(false, uc_handle_exit(self)); + ASSERT_EQ(2, sync_regs->gprs[0]); + /* assert initial skey (ACC = 0, R & C = 1) */ + ASSERT_EQ(0x06, sync_regs->gprs[1]); + uc_assert_diag44(self); + + /* SSKE */ + sync_regs->gprs[1] = skeyvalue; + run->kvm_dirty_regs |= KVM_SYNC_GPRS; + ASSERT_EQ(0, uc_run_once(self)); + ASSERT_EQ(false, uc_handle_exit(self)); + ASSERT_EQ(3, sync_regs->gprs[0]); + ASSERT_EQ(skeyvalue, sync_regs->gprs[1]); + uc_assert_diag44(self); + + /* RRBE */ + sync_regs->gprs[1] = skeyvalue; + run->kvm_dirty_regs |= KVM_SYNC_GPRS; + ASSERT_EQ(0, uc_run_once(self)); + ASSERT_EQ(false, uc_handle_exit(self)); + ASSERT_EQ(4, sync_regs->gprs[0]); + /* assert R reset but rest of skey unchanged*/ + ASSERT_EQ(skeyvalue & 0xfa, sync_regs->gprs[1]); + ASSERT_EQ(0x00, sync_regs->gprs[1] & 0x04); + uc_assert_diag44(self); +} + TEST_HARNESS_MAIN