Re: [PATCH 1/3] selftests: kvm: s390: Add uc_map_unmap VM test case

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On 8/15/24 5:45 PM, 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 <schlameuss@xxxxxxxxxxxxx>
---
  .../selftests/kvm/s390x/ucontrol_test.c       | 120 +++++++++++++++++-
  1 file changed, 119 insertions(+), 1 deletion(-)


+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 PGM_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;

Why is this necessary if you fix up the mapping in the test?

[...]

+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;
+
+	/* 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);
+
+	/* DAT disabled + 64 bit mode */
+	run->psw_mask = 0x0000000180000000ULL;
+	run->psw_addr = self->code_gpa;
+
+	/* 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 */

s/witch/with/

+	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(PGM_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));

s/map/unmap/


+	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;





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