[kvm-unit-tests PATCH v3 2/9] s390x: uv-host: Fence a destroy cpu test on z15

[Janosch Frank <frankja@xxxxxxxxxxxxx>]

Firmware will not give us the expected return code on z15 so let's
fence it for the z15 machine generation.

Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Acked-by: Thomas Huth <thuth@xxxxxxxxxx>
---
 lib/s390x/asm/arch_def.h | 14 ++++++++++++++
 s390x/uv-host.c          | 11 +++++++----
 2 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index aa80d840..c8d2722a 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -219,6 +219,20 @@ static inline unsigned short stap(void)
 	return cpu_address;
 }
 
+#define MACHINE_Z15A	0x8561
+#define MACHINE_Z15B	0x8562
+
+static inline uint16_t get_machine_id(void)
+{
+	uint64_t cpuid;
+
+	asm volatile("stidp %0" : "=Q" (cpuid));
+	cpuid = cpuid >> 16;
+	cpuid &= 0xffff;
+
+	return cpuid;
+}
+
 static inline int tprot(unsigned long addr)
 {
 	int cc;
diff --git a/s390x/uv-host.c b/s390x/uv-host.c
index 4b72c24d..92a41069 100644
--- a/s390x/uv-host.c
+++ b/s390x/uv-host.c
@@ -111,6 +111,7 @@ static void test_config_destroy(void)
 static void test_cpu_destroy(void)
 {
 	int rc;
+	uint16_t machineid = get_machine_id();
 	struct uv_cb_nodata uvcb = {
 		.header.len = sizeof(uvcb),
 		.header.cmd = UVC_CMD_DESTROY_SEC_CPU,
@@ -125,10 +126,12 @@ static void test_cpu_destroy(void)
 	       "hdr invalid length");
 	uvcb.header.len += 8;
 
-	uvcb.handle += 1;
-	rc = uv_call(0, (uint64_t)&uvcb);
-	report(rc == 1 && uvcb.header.rc == UVC_RC_INV_CHANDLE, "invalid handle");
-	uvcb.handle -= 1;
+	if (machineid != MACHINE_Z15A && machineid != MACHINE_Z15B) {
+		uvcb.handle += 1;
+		rc = uv_call(0, (uint64_t)&uvcb);
+		report(rc == 1 && uvcb.header.rc == UVC_RC_INV_CHANDLE, "invalid handle");
+		uvcb.handle -= 1;
+	}
 
 	rc = uv_call(0, (uint64_t)&uvcb);
 	report(rc == 0 && uvcb.header.rc == UVC_RC_EXECUTED, "success");
-- 
2.30.2