Re: [kvm-unit-tests PATCH v3 3/3] s390x/spec_ex: Add test of EXECUTE with odd target address

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On 17/03/2023 15.09, Thomas Huth wrote:
On 15/03/2023 16.54, Nina Schoetterl-Glausch wrote:
The EXECUTE instruction executes the instruction at the given target
address. This address must be halfword aligned, otherwise a
specification exception occurs.
Add a test for this.

Signed-off-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
---
  s390x/spec_ex.c | 25 +++++++++++++++++++++++++
  1 file changed, 25 insertions(+)

diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c
index 83b8c58e..5fa05dba 100644
--- a/s390x/spec_ex.c
+++ b/s390x/spec_ex.c
@@ -177,6 +177,30 @@ static int short_psw_bit_12_is_0(void)
      return 0;
  }
+static int odd_ex_target(void)
+{
+    uint64_t pre_target_addr;
+    int to = 0, from = 0x0dd;
+
+    asm volatile ( ".pushsection .text.ex_odd\n"
+        "    .balign    2\n"
+        "pre_odd_ex_target:\n"
+        "    . = . + 1\n"
+        "    lr    %[to],%[from]\n"
+        "    .popsection\n"
+
+        "    larl    %[pre_target_addr],pre_odd_ex_target\n"
+        "    ex    0,1(%[pre_target_addr])\n"
+        : [pre_target_addr] "=&a" (pre_target_addr),
+          [to] "+d" (to)
+        : [from] "d" (from)
+    );
+
+    assert((pre_target_addr + 1) & 1);
+    report(to != from, "did not perform ex with odd target");
+    return 0;
+}

Can this be triggered with KVM, or is this just a test for TCG?

With "triggered" I mean: Can this cause an interception in KVM?

 Thomas




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