[kvm-unit-tests PATCH v2 3/5] lib: s390: rename and refactor vm.[ch]

Claudio Imbrenda
2022-03-31T16:04:39Z

Refactor and rename vm.[ch] to hardware.[ch]

* Rename vm.[ch] to hardware.[ch]
* Consolidate all detection functions into detect_host, which returns
what host system the test is running on
* Rename vm_is_* functions to host_is_*, which are then just wrappers
around detect_host

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
s390x/Makefile | 2 +-
lib/s390x/hardware.h | 40 +++++++++++++++++++
lib/s390x/vm.h | 15 --------
lib/s390x/hardware.c | 69 +++++++++++++++++++++++++++++++++
lib/s390x/vm.c | 92 --------------------------------------------
s390x/cpumodel.c | 4 +-
s390x/mvpg.c | 4 +-
7 files changed, 114 insertions(+), 112 deletions(-)
create mode 100644 lib/s390x/hardware.h
delete mode 100644 lib/s390x/vm.h
create mode 100644 lib/s390x/hardware.c
delete mode 100644 lib/s390x/vm.c

diff --git a/s390x/Makefile b/s390x/Makefile
index 53b0fe04..9d3a1fd7 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -78,7 +78,7 @@ cflatobjs += lib/s390x/sclp-console.o
cflatobjs += lib/s390x/interrupt.o
cflatobjs += lib/s390x/mmu.o
cflatobjs += lib/s390x/smp.o
-cflatobjs += lib/s390x/vm.o
+cflatobjs += lib/s390x/hardware.o
cflatobjs += lib/s390x/css_dump.o
cflatobjs += lib/s390x/css_lib.o
cflatobjs += lib/s390x/malloc_io.o
diff --git a/lib/s390x/hardware.h b/lib/s390x/hardware.h
new file mode 100644
index 00000000..e5910ea5
--- /dev/null
+++ b/lib/s390x/hardware.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Functions to retrieve information about the host system.
+ *
+ * Copyright (c) 2020 Red Hat Inc
+ * Copyright 2022 IBM Corp.
+ *
+ * Authors:
+ * Claudio Imbrenda <imbrenda@linux.ibm.com>
+ */
+
+#ifndef _S390X_HARDWARE_H_
+#define _S390X_HARDWARE_H_
+#include <asm/arch_def.h>
+
+enum s390_host {
+ HOST_IS_UNKNOWN,
+ HOST_IS_LPAR,
+ HOST_IS_KVM,
+ HOST_IS_TCG
+};
+
+enum s390_host detect_host(void);
+
+static inline bool host_is_tcg(void)
+{
+ return detect_host() == HOST_IS_TCG;
+}
+
+static inline bool host_is_kvm(void)
+{
+ return detect_host() == HOST_IS_KVM;
+}
+
+static inline bool host_is_lpar(void)
+{
+ return detect_host() == HOST_IS_LPAR;
+}
+
+#endif /* _S390X_HARDWARE_H_ */
diff --git a/lib/s390x/vm.h b/lib/s390x/vm.h
deleted file mode 100644
index 4456b48c..00000000
--- a/lib/s390x/vm.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Functions to retrieve VM-specific information
- *
- * Copyright (c) 2020 Red Hat Inc
- */
-
-#ifndef _S390X_VM_H_
-#define _S390X_VM_H_
-
-bool vm_is_tcg(void);
-bool vm_is_kvm(void);
-bool vm_is_lpar(void);
-
-#endif /* _S390X_VM_H_ */
diff --git a/lib/s390x/hardware.c b/lib/s390x/hardware.c
new file mode 100644
index 00000000..2bcf9c4c
--- /dev/null
+++ b/lib/s390x/hardware.c
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Functions to retrieve information about the host system.
+ *
+ * Copyright (c) 2020 Red Hat Inc
+ * Copyright 2022 IBM Corp.
+ *
+ * Authors:
+ * Thomas Huth <thuth@redhat.com>
+ * Claudio Imbrenda <imbrenda@linux.ibm.com>
+ */
+
+#include <libcflat.h>
+#include <alloc_page.h>
+#include <asm/arch_def.h>
+#include "hardware.h"
+#include "stsi.h"
+
+/* The string "QEMU" in EBCDIC */
+static const uint8_t qemu_ebcdic[] = { 0xd8, 0xc5, 0xd4, 0xe4 };
+/* The string "KVM/" in EBCDIC */
+static const uint8_t kvm_ebcdic[] = { 0xd2, 0xe5, 0xd4, 0x61 };
+
+static enum s390_host do_detect_host(void *buf)
+{
+ struct sysinfo_3_2_2 *stsi_322 = buf;
+
+ if (stsi_get_fc() == 2)
+ return HOST_IS_LPAR;
+
+ if (stsi_get_fc() != 3)
+ return HOST_IS_UNKNOWN;
+
+ if (!stsi(buf, 1, 1, 1)) {
+ /*
+ * If the manufacturer string is "QEMU" in EBCDIC, then we
+ * are on TCG (otherwise the string is "IBM" in EBCDIC)
+ */
+ if (!memcmp((char *)buf + 32, qemu_ebcdic, sizeof(qemu_ebcdic)))
+ return HOST_IS_TCG;
+ }
+
+ if (!stsi(buf, 3, 2, 2)) {
+ /*
+ * If the manufacturer string is "KVM/" in EBCDIC, then we
+ * are on KVM.
+ */
+ if (!memcmp(&stsi_322->vm[0].cpi, kvm_ebcdic, sizeof(kvm_ebcdic)))
+ return HOST_IS_KVM;
+ }
+
+ return HOST_IS_UNKNOWN;
+}
+
+enum s390_host detect_host(void)
+{
+ static enum s390_host host = HOST_IS_UNKNOWN;
+ static bool initialized = false;
+ void *buf;
+
+ if (initialized)
+ return host;
+
+ buf = alloc_page();
+ host = do_detect_host(buf);
+ free_page(buf);
+ initialized = true;
+ return host;
+}
diff --git a/lib/s390x/vm.c b/lib/s390x/vm.c
deleted file mode 100644
index 33fb1c45..00000000
--- a/lib/s390x/vm.c
+++ /dev/null
@@ -1,92 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Functions to retrieve VM-specific information
- *
- * Copyright (c) 2020 Red Hat Inc
- *
- * Authors:
- * Thomas Huth <thuth@redhat.com>
- */
-
-#include <libcflat.h>
-#include <alloc_page.h>
-#include <asm/arch_def.h>
-#include "vm.h"
-#include "stsi.h"
-
-/**
- * Detect whether we are running with TCG (instead of KVM)
- */
-bool vm_is_tcg(void)
-{
- const char qemu_ebcdic[] = { 0xd8, 0xc5, 0xd4, 0xe4 };
- static bool initialized = false;
- static bool is_tcg = false;
- uint8_t *buf;
-
- if (initialized)
- return is_tcg;
-
- if (stsi_get_fc() != 3) {
- initialized = true;
- return is_tcg;
- }
-
- buf = alloc_page();
- assert(buf);
-
- if (stsi(buf, 1, 1, 1))
- goto out;
-
- /*
- * If the manufacturer string is "QEMU" in EBCDIC, then we
- * are on TCG (otherwise the string is "IBM" in EBCDIC)
- */
- is_tcg = !memcmp(&buf[32], qemu_ebcdic, sizeof(qemu_ebcdic));
- initialized = true;
-out:
- free_page(buf);
- return is_tcg;
-}
-
-/**
- * Detect whether we are running with KVM
- */
-bool vm_is_kvm(void)
-{
- /* EBCDIC for "KVM/" */
- const uint8_t kvm_ebcdic[] = { 0xd2, 0xe5, 0xd4, 0x61 };
- static bool initialized;
- static bool is_kvm;
- struct sysinfo_3_2_2 *stsi_322;
-
- if (initialized)
- return is_kvm;
-
- if (stsi_get_fc() != 3 || vm_is_tcg()) {
- initialized = true;
- return is_kvm;
- }
-
- stsi_322 = alloc_page();
- assert(stsi_322);
-
- if (stsi(stsi_322, 3, 2, 2))
- goto out;
-
- /*
- * If the manufacturer string is "KVM/" in EBCDIC, then we
- * are on KVM.
- */
- is_kvm = !memcmp(&stsi_322->vm[0].cpi, kvm_ebcdic, sizeof(kvm_ebcdic));
- initialized = true;
-out:
- free_page(stsi_322);
- return is_kvm;
-}
-
-bool vm_is_lpar(void)
-{
- return stsi_get_fc() == 2;
-}
-
diff --git a/s390x/cpumodel.c b/s390x/cpumodel.c
index 23ccf842..5c0b73e0 100644
--- a/s390x/cpumodel.c
+++ b/s390x/cpumodel.c
@@ -10,7 +10,7 @@
*/

#include <asm/facility.h>
-#include <vm.h>
+#include <hardware.h>
#include <sclp.h>
#include <uv.h>
#include <asm/uv.h>
@@ -118,7 +118,7 @@ int main(void)
for (i = 0; i < ARRAY_SIZE(dep); i++) {
report_prefix_pushf("%d implies %d", dep[i].facility, dep[i].implied);
if (test_facility(dep[i].facility)) {
- report_xfail(dep[i].expected_tcg_fail && vm_is_tcg(),
+ report_xfail(dep[i].expected_tcg_fail && host_is_tcg(),
test_facility(dep[i].implied),
"implication not correct");
} else {
diff --git a/s390x/mvpg.c b/s390x/mvpg.c
index 2b7c6cc9..62f0fc5a 100644
--- a/s390x/mvpg.c
+++ b/s390x/mvpg.c
@@ -20,7 +20,7 @@
#include <smp.h>
#include <alloc_page.h>
#include <bitops.h>
-#include <vm.h>
+#include <hardware.h>

/* Used to build the appropriate test values for register 0 */
#define KFC(x) ((x) << 10)
@@ -251,7 +251,7 @@ static void test_mmu_prot(void)
fresh += PAGE_SIZE;

/* Known issue in TCG: CCO flag is not honoured */
- if (vm_is_tcg()) {
+ if (host_is_tcg()) {
report_prefix_push("TCG");
report_skip("destination invalid");
report_skip("source invalid");
--
2.34.1