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Thu, 1 Aug 2024 09:08:32 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CF2DB2004B; Thu, 1 Aug 2024 09:08:30 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8C64020043; Thu, 1 Aug 2024 09:08:30 +0000 (GMT) Received: from [9.152.224.253] (unknown [9.152.224.253]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 1 Aug 2024 09:08:30 +0000 (GMT) Message-ID: <0b323867-a2f8-4bae-9f33-02ecf8362a13@linux.ibm.com> Date: Thu, 1 Aug 2024 11:08:30 +0200 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 07/10] selftests: kvm: s390: Add uc_map_unmap VM test case To: Christoph Schlameuss , kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org, Paolo Bonzini , Shuah Khan , Christian Borntraeger , Claudio Imbrenda , David Hildenbrand , Nina Schoetterl-Glausch References: <20240730072413.143556-1-schlameuss@linux.ibm.com> <20240730072413.143556-8-schlameuss@linux.ibm.com> Content-Language: en-US From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: K1DY7TN9CjgcBSvj7SknX8ng-4noPyxf X-Proofpoint-ORIG-GUID: nNX-dTe7teGYTde5rg_2w07eNGv6MhZO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-01_06,2024-07-31_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 suspectscore=0 phishscore=0 adultscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408010053 On 7/30/24 9:24 AM, Christoph Schlameuss wrote: > Add a test case verifying basic running and interaction of ucontrol VMs. > Fill the segment and page tables for allocated memory and map memory on > first access. > > * uc_map_unmap > Store and load data to mapped and unmapped memory and use pic segment > translation handling to map memory on access. > > Signed-off-by: Christoph Schlameuss > --- > .../selftests/kvm/s390x/ucontrol_test.c | 165 +++++++++++++++++- > 1 file changed, 164 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/kvm/s390x/ucontrol_test.c b/tools/testing/selftests/kvm/s390x/ucontrol_test.c > index 817b1e08559c..b7f760f980fd 100644 > --- a/tools/testing/selftests/kvm/s390x/ucontrol_test.c > +++ b/tools/testing/selftests/kvm/s390x/ucontrol_test.c > @@ -16,7 +16,13 @@ > #include > #include > > +#define UC_PIC_SEGMENT_TRANSLATION 0x10 That's a bit clearer and used by KVM: #define PGM_SEGMENT_TRANSLATION 0x10 > + > #define VM_MEM_SIZE (4 * SZ_1M) > +#define VM_MEM_EXT_SIZE (2 * SZ_1M) > +#define VM_MEM_MAX (VM_MEM_SIZE + VM_MEM_EXT_SIZE) > + [...] > + self->pgd = self->base_gpa + SZ_1M; /* set PASCE addr */ Please put the comments on the line above > + phd = gpa2hva(self, self->pgd); > + memset(phd, 0xff, PAGES_PER_SEGMENT * PAGE_SIZE); > + > + for (si = 0; si < ((VM_MEM_SIZE + VM_MEM_EXT_SIZE) / SZ_1M); si++) { > + /* create ste */ > + phd[si] = (self->pgd > + + (PAGES_PER_SEGMENT * PAGE_SIZE > + * ((VM_MEM_SIZE + VM_MEM_EXT_SIZE) / SZ_1M)) > + + (PAGES_PER_SEGMENT * PAGE_SIZE * si)) & ~0x7fful; > + se_addr = gpa2hva(self, phd[si]); > + memset(se_addr, 0xff, PAGES_PER_SEGMENT * PAGE_SIZE); > + for (pi = 0; pi < (SZ_1M / PAGE_SIZE); pi++) { > + /* create pte */ > + ((u64 *)se_addr)[pi] = (self->base_gpa > + + (si * SZ_1M) + (pi * PAGE_SIZE)) & ~0xffful; > + } > + } > + pr_debug("segment table entry %p (0x%lx) --> %p\n", > + phd, phd[0], gpa2hva(self, (phd[0] & ~0x7fful))); > + print_hex_bytes("st", (u64)phd, 64); > + print_hex_bytes("pt", (u64)gpa2hva(self, phd[0]), 128); > + print_hex_bytes("pt+", (u64) > + gpa2hva(self, phd[0] + (PAGES_PER_SEGMENT * PAGE_SIZE > + * ((VM_MEM_SIZE + VM_MEM_EXT_SIZE) / SZ_1M)) - 0x64), 128); > + > + sync_regs->crs[1] = self->pgd | 0x3; /* PASCE TT=00 for segment table */ Same here > + run->kvm_dirty_regs |= KVM_SYNC_CRS; > +} > + > +static void uc_handle_exit_ucontrol(FIXTURE_DATA(uc_kvm) * self) > +{ > + struct kvm_run *run = self->run; > + > + TEST_ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason); > + switch (run->s390_ucontrol.pgm_code) { > + case UC_PIC_SEGMENT_TRANSLATION: > + pr_info("ucontrol pic segment translation 0x%llx\n", > + run->s390_ucontrol.trans_exc_code); > + /* map / make additional memory available */ > + struct kvm_s390_ucas_mapping map2 = { > + .user_addr = (u64)gpa2hva(self, run->s390_ucontrol.trans_exc_code), > + .vcpu_addr = run->s390_ucontrol.trans_exc_code, > + .length = VM_MEM_EXT_SIZE, > + }; > + pr_info("ucas map %p %p 0x%llx\n", > + (void *)map2.user_addr, (void *)map2.vcpu_addr, map2.length); > + TEST_ASSERT_EQ(0, ioctl(self->vcpu_fd, KVM_S390_UCAS_MAP, &map2)); > + break; > + default: > + TEST_FAIL("UNEXPECTED PGM CODE %d", run->s390_ucontrol.pgm_code); > + } > +} > + > /* verify SIEIC exit > * * reset stop requests > * * fail on codes not expected in the test cases > @@ -245,7 +338,11 @@ static bool uc_handle_sieic(FIXTURE_DATA(uc_kvm) * self) > break; > case ICPT_INST: > /* end execution in caller on intercepted instruction */ > + pr_info("sie instruction interception\n"); That should have been part of an earlier patch? > return false; > + case ICPT_OPEREXC: > + /* operation exception */ > + TEST_FAIL("sie exception on %.4x%.8x", sie_block->ipa, sie_block->ipb); > default: > TEST_FAIL("UNEXPECTED SIEIC CODE %d", run->s390_sieic.icptcode); > } > @@ -258,6 +355,11 @@ static bool uc_handle_exit(FIXTURE_DATA(uc_kvm) * self) > struct kvm_run *run = self->run; > > switch (run->exit_reason) { > + case KVM_EXIT_S390_UCONTROL: > + /* check program interruption code */ > + /* handle page fault --> ucas map */ Multi-line comments do exist > + uc_handle_exit_ucontrol(self); > + break; > case KVM_EXIT_S390_SIEIC: > return uc_handle_sieic(self); > default: > @@ -289,6 +391,67 @@ static void uc_assert_diag44(FIXTURE_DATA(uc_kvm) * self) > TEST_ASSERT_EQ(0x440000, sie_block->ipb); > } > > +TEST_F(uc_kvm, uc_map_unmap) > +{ > + struct kvm_sync_regs *sync_regs = &self->run->s.regs; > + struct kvm_run *run = self->run; > + int rc; > + > + init_st_pt(self); > + > + /* copy test_mem_asm to code_hva / code_gpa */ > + TH_LOG("copy code %p to vm mapped memory %p / %p", > + &test_mem_asm, (void *)self->code_hva, (void *)self->code_gpa); > + memcpy((void *)self->code_hva, &test_mem_asm, PAGE_SIZE); > + > + run->psw_mask = 0x0400000180000000ULL; /* DAT enabled + 64 bit mode */ > + run->psw_addr = self->code_gpa; Please put the comments on the line above > + > + /* set register content for test_mem_asm to access not mapped memory*/ > + sync_regs->gprs[1] = 0x55; > + sync_regs->gprs[5] = self->base_gpa; > + sync_regs->gprs[6] = VM_MEM_SIZE; > + run->kvm_dirty_regs |= KVM_SYNC_GPRS; > + > + /* run and expect to fail witch ucontrol pic segment translation */ > + ASSERT_EQ(0, uc_run_once(self)); > + ASSERT_EQ(1, sync_regs->gprs[0]); > + ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason); > + > + ASSERT_EQ(UC_PIC_SEGMENT_TRANSLATION, run->s390_ucontrol.pgm_code); > + ASSERT_EQ(self->base_gpa + VM_MEM_SIZE, run->s390_ucontrol.trans_exc_code); > + /* map / make additional memory available */ > + struct kvm_s390_ucas_mapping map2 = { > + .user_addr = (u64)gpa2hva(self, self->base_gpa + VM_MEM_SIZE), > + .vcpu_addr = self->base_gpa + VM_MEM_SIZE, > + .length = VM_MEM_EXT_SIZE, > + }; > + TH_LOG("ucas map %p %p 0x%llx", > + (void *)map2.user_addr, (void *)map2.vcpu_addr, map2.length); > + rc = ioctl(self->vcpu_fd, KVM_S390_UCAS_MAP, &map2); > + ASSERT_EQ(0, rc) > + TH_LOG("ucas map result %d not expected, %s", rc, strerror(errno)); > + ASSERT_EQ(0, uc_run_once(self)); > + ASSERT_EQ(false, uc_handle_exit(self)); > + uc_assert_diag44(self); > + > + /* assert registers and memory are in expected state */ > + ASSERT_EQ(2, sync_regs->gprs[0]); > + ASSERT_EQ(0x55, sync_regs->gprs[1]); > + ASSERT_EQ(0x55, *(u32 *)gpa2hva(self, self->base_gpa + VM_MEM_SIZE)); > + > + /* unmap and run loop again */ > + TH_LOG("ucas unmap %p %p 0x%llx", > + (void *)map2.user_addr, (void *)map2.vcpu_addr, map2.length); > + rc = ioctl(self->vcpu_fd, KVM_S390_UCAS_UNMAP, &map2); > + ASSERT_EQ(0, rc) > + TH_LOG("ucas map result %d not expected, %s", rc, strerror(errno)); > + ASSERT_EQ(0, uc_run_once(self)); > + ASSERT_EQ(3, sync_regs->gprs[0]); > + ASSERT_EQ(KVM_EXIT_S390_UCONTROL, run->exit_reason); > + ASSERT_EQ(true, uc_handle_exit(self)); > +} > + > TEST_F(uc_kvm, uc_gprs) > { > struct kvm_sync_regs *sync_regs = &self->run->s.regs;