Re: [kvm-unit-tests PATCH v4 3/4] s390x: topology: Check the Perform Topology Function

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On 2/9/22 12:37, Nico Boehr wrote:
On Tue, 2022-02-08 at 14:27 +0100, Pierre Morel wrote:
We check the PTF instruction.

You could test some very basic things as well:

- you get a privileged pgm int in problem state,
- reserved bits in first operand cause specification pgm int,
- reserved FC values result in a specification pgm int,
- second operand is ignored.

Which second operand?



- We do not expect to support vertical polarization.

- We do not expect the Modified Topology Change Report to be
[...]

Forgive me if I'm missing something, but why _Modified_ Topology Change
Report?

diff --git a/s390x/topology.c b/s390x/topology.c
new file mode 100644
index 00000000..a1f9ce51
--- /dev/null
+++ b/s390x/topology.c

[...]

+static int ptf(unsigned long fc, unsigned long *rc)
+{
+       int cc;
+
+       asm volatile(
+               "       .insn   rre,0xb9a20000,%1,0\n"
+               "       ipm     %0\n"
+               "       srl     %0,28\n"
+               : "=d" (cc), "+d" (fc)
+               : "d" (fc)

Why list fc here again?



--
Pierre Morel
IBM Lab Boeblingen



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