Re: [kvm-unit-tests PATCH v7 1/2] s390x: topology: Check the Perform Topology Function

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On 3/23/23 16:45, Claudio Imbrenda wrote:
On Mon, 20 Mar 2023 09:56:41 +0100
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:

We check that the PTF instruction is working correctly when
the cpu topology facility is available.

For KVM only, we test changing of the polarity between horizontal
and vertical and that a reset set the horizontal polarity.

Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
  s390x/Makefile      |   1 +
  s390x/topology.c    | 180 ++++++++++++++++++++++++++++++++++++++++++++
  s390x/unittests.cfg |   3 +
  3 files changed, 184 insertions(+)
  create mode 100644 s390x/topology.c

diff --git a/s390x/Makefile b/s390x/Makefile
index e94b720..05dac04 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -40,6 +40,7 @@ tests += $(TEST_DIR)/panic-loop-pgm.elf
  tests += $(TEST_DIR)/migration-sck.elf
  tests += $(TEST_DIR)/exittime.elf
  tests += $(TEST_DIR)/ex.elf
+tests += $(TEST_DIR)/topology.elf
pv-tests += $(TEST_DIR)/pv-diags.elf diff --git a/s390x/topology.c b/s390x/topology.c
new file mode 100644
index 0000000..ce248f1
--- /dev/null
+++ b/s390x/topology.c
@@ -0,0 +1,180 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * CPU Topology
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Authors:
+ *  Pierre Morel <pmorel@xxxxxxxxxxxxx>
+ */
+
+#include <libcflat.h>
+#include <asm/page.h>
+#include <asm/asm-offsets.h>
+#include <asm/interrupt.h>
+#include <asm/facility.h>
+#include <smp.h>
+#include <sclp.h>
+#include <s390x/hardware.h>
+
+#define PTF_REQ_HORIZONTAL	0
+#define PTF_REQ_VERTICAL	1
+#define PTF_REQ_CHECK		2
+
+#define PTF_ERR_NO_REASON	0
+#define PTF_ERR_ALRDY_POLARIZED	1
+#define PTF_ERR_IN_PROGRESS	2
+
+extern int diag308_load_reset(u64);
+
+static int ptf(unsigned long fc, unsigned long *rc)
+{
+	int cc;
+
+	asm volatile(
+		"	ptf	%1	\n"
+		"       ipm     %0	\n"
+		"       srl     %0,28	\n"
+		: "=d" (cc), "+d" (fc)
+		:
+		: "cc");
+
+	*rc = fc >> 8;
+	return cc;
+}
+
+static void check_privilege(int fc)
+{
+	unsigned long rc;
+
+	report_prefix_push("Privilege");
+	report_info("function code %d", fc);
+	enter_pstate();
+	expect_pgm_int();
+	ptf(fc, &rc);
+	check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION);
+	report_prefix_pop();
+}
+
+static void check_function_code(void)
+{
+	unsigned long rc;
+
+	report_prefix_push("Undefined fc");
+	expect_pgm_int();
+	ptf(0xff, &rc);
please don't use magic numbers, add a new macro PTF_INVALID_FUNCTION
(or something like that)

OK



+	check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+	report_prefix_pop();
+}
+
+static void check_reserved_bits(void)
+{
+	unsigned long rc;
+
+	report_prefix_push("Reserved bits");
+	expect_pgm_int();
+	ptf(0xffffffffffffff00UL, &rc);
I would like every single bit to be tested, since all of them are
required to be zero.

make a loop and test each, but please report success of failure only
once at the end.
use a report_info in case of failure to indicate which bit failed


OK



+	check_pgm_int_code(PGM_INT_CODE_SPECIFICATION);
+	report_prefix_pop();
+}
+
+static void check_mtcr_pending(void)
+{
+	unsigned long rc;
+	int cc;
+
+	report_prefix_push("Topology Report pending");
+	/*
+	 * At this moment the topology may already have changed
+	 * since the VM has been started.
+	 * However, we can test if a second PTF instruction
+	 * reports that the topology did not change since the
+	 * preceding PFT instruction.
+	 */
+	ptf(PTF_REQ_CHECK, &rc);
+	cc = ptf(PTF_REQ_CHECK, &rc);
+	report(cc == 0, "PTF check should clear topology report");
+	report_prefix_pop();
+}
+
+static void check_polarization_change(void)
+{
+	unsigned long rc;
+	int cc;
+
+	report_prefix_push("Topology polarization check");
+
+	/* We expect a clean state through reset */
+	report(diag308_load_reset(1), "load normal reset done");
+
+	/*
+	 * Set vertical polarization to verify that RESET sets
+	 * horizontal polarization back.
+	 */
+	cc = ptf(PTF_REQ_VERTICAL, &rc);
+	report(cc == 0, "Set vertical polarization.");
+
+	report(diag308_load_reset(1), "load normal reset done");
+
+	cc = ptf(PTF_REQ_CHECK, &rc);
+	report(cc == 0, "Reset should clear topology report");
+
+	cc = ptf(PTF_REQ_HORIZONTAL, &rc);
+	report(cc == 2 && rc == PTF_ERR_ALRDY_POLARIZED,
+	       "After RESET polarization is horizontal");
+
+	/* Flip between vertical and horizontal polarization */
+	cc = ptf(PTF_REQ_VERTICAL, &rc);
+	report(cc == 0, "Change to vertical polarization.");
either here or in a new block, test that setting vertical twice in
a row will also result in a cc == 2 && rc == PTF_ERR_ALRDY_POLARIZED


OK



+
+	cc = ptf(PTF_REQ_CHECK, &rc);
+	report(cc == 1, "Polarization change should set topology report");
+
+	cc = ptf(PTF_REQ_HORIZONTAL, &rc);
+	report(cc == 0, "Change to horizontal polarization.");
it cannot hurt to add here another check for pending reports


OK


Thanks for the comments,


Regards,

Pierre




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