On 9/13/24 1:52 PM, Christoph Schlameuss wrote:
Add a test case manipulating s390 storage keys from within the ucontrol
VM.
Signed-off-by: Christoph Schlameuss <schlameuss@xxxxxxxxxxxxx>
Except for the two nits:
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
I'll think about what to do with the nits next week.
---
.../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
Argh, that made it in the patches that I've picked up.
+ * * 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*/
Missing space before "*"
+ ASSERT_EQ(skeyvalue & 0xfa, sync_regs->gprs[1]);
+ ASSERT_EQ(0x00, sync_regs->gprs[1] & 0x04);
+ uc_assert_diag44(self);
+}
+
TEST_HARNESS_MAIN
