[kvm-unit-tests PATCH 1/5] lib: s390x: vm: Add kvm and lpar vm queries

[Janosch Frank <frankja@xxxxxxxxxxxxx>]

This patch will likely (in parts) be replaced by Pierre's patch from
his topology test series.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
---
 lib/s390x/vm.c | 39 +++++++++++++++++++++++++++++++++++++++
 lib/s390x/vm.h | 23 +++++++++++++++++++++++
 s390x/stsi.c   | 21 +--------------------
 3 files changed, 63 insertions(+), 20 deletions(-)

diff --git a/lib/s390x/vm.c b/lib/s390x/vm.c
index a5b92863..266a81c1 100644
--- a/lib/s390x/vm.c
+++ b/lib/s390x/vm.c
@@ -26,6 +26,11 @@ bool vm_is_tcg(void)
 	if (initialized)
 		return is_tcg;
 
+	if (stsi_get_fc() < 3) {
+		initialized = true;
+		return false;
+	}
+
 	buf = alloc_page();
 	if (!buf)
 		return false;
@@ -43,3 +48,37 @@ out:
 	free_page(buf);
 	return is_tcg;
 }
+
+bool vm_is_kvm(void)
+{
+	const uint8_t cpi_kvm[] = { 0xd2, 0xe5, 0xd4, 0x61 };
+	struct stsi_322 *buf;
+	static bool initialized = false;
+	static bool is_kvm = false;
+
+	if (initialized)
+		return is_kvm;
+
+	if (stsi_get_fc() < 3) {
+		initialized = true;
+		return false;
+	}
+
+	buf = alloc_page();
+	if (!buf)
+		return false;
+
+	if (stsi(buf, 3, 2, 2))
+		goto out;
+
+	is_kvm = !(memcmp(&buf->vm[0].cpi, cpi_kvm, sizeof(cpi_kvm))) && !vm_is_tcg();
+	initialized = true;
+out:
+	free_page(buf);
+	return is_kvm;
+}
+
+bool vm_is_lpar(void)
+{
+	return stsi_get_fc() == 1;
+}
diff --git a/lib/s390x/vm.h b/lib/s390x/vm.h
index 7abba0cc..d4a82fc0 100644
--- a/lib/s390x/vm.h
+++ b/lib/s390x/vm.h
@@ -8,6 +8,29 @@
 #ifndef _S390X_VM_H_
 #define _S390X_VM_H_
 
+struct stsi_322 {
+	uint8_t reserved[31];
+	uint8_t count;
+	struct {
+		uint8_t reserved2[4];
+		uint16_t total_cpus;
+		uint16_t conf_cpus;
+		uint16_t standby_cpus;
+		uint16_t reserved_cpus;
+		uint8_t name[8];
+		uint32_t caf;
+		uint8_t cpi[16];
+		uint8_t reserved5[3];
+		uint8_t ext_name_encoding;
+		uint32_t reserved3;
+		uint8_t uuid[16];
+	} vm[8];
+	uint8_t reserved4[1504];
+	uint8_t ext_names[8][256];
+};
+
 bool vm_is_tcg(void);
+bool vm_is_kvm(void);
+bool vm_is_lpar(void);
 
 #endif  /* _S390X_VM_H_ */
diff --git a/s390x/stsi.c b/s390x/stsi.c
index 391f8849..e66d07a1 100644
--- a/s390x/stsi.c
+++ b/s390x/stsi.c
@@ -13,27 +13,8 @@
 #include <asm/asm-offsets.h>
 #include <asm/interrupt.h>
 #include <smp.h>
+#include <vm.h>
 
-struct stsi_322 {
-	uint8_t reserved[31];
-	uint8_t count;
-	struct {
-		uint8_t reserved2[4];
-		uint16_t total_cpus;
-		uint16_t conf_cpus;
-		uint16_t standby_cpus;
-		uint16_t reserved_cpus;
-		uint8_t name[8];
-		uint32_t caf;
-		uint8_t cpi[16];
-		uint8_t reserved5[3];
-		uint8_t ext_name_encoding;
-		uint32_t reserved3;
-		uint8_t uuid[16];
-	} vm[8];
-	uint8_t reserved4[1504];
-	uint8_t ext_names[8][256];
-};
 static uint8_t pagebuf[PAGE_SIZE * 2] __attribute__((aligned(PAGE_SIZE * 2)));
 
 static void test_specs(void)
-- 
2.32.0