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

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On 8/19/24 6:03 PM, Christoph Schlameuss wrote:
On Fri Aug 16, 2024 at 4:29 PM CEST, Janosch Frank wrote:
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?


This is also used within the uc_skey test to make sure the remap does
work after the unmap.

Maybe I'm blind because I'm still recovering but where exactly?





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