[kvm-unit-tests PATCH 5/6] s390x: Prepare for external calls

Janosch Frank
2019-08-29T12:15:29Z

With SMP we also get new external interrupts like external call and
emergency call. Let's make them known.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
lib/s390x/asm/arch_def.h | 5 +++++
lib/s390x/asm/interrupt.h | 3 +++
lib/s390x/interrupt.c | 24 ++++++++++++++++++++----
3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index d5a7f51..5ece2ce 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -19,6 +19,11 @@ struct psw {
#define PSW_MASK_DAT 0x0400000000000000UL
#define PSW_MASK_PSTATE 0x0001000000000000UL

+#define CR0_EXTM_SCLP 0X0000000000000200UL
+#define CR0_EXTM_EXTC 0X0000000000004000UL
+#define CR0_EXTM_EMGC 0X0000000000008000UL
+#define CR0_EXTM_MASK 0X000000000001DD40UL
+
struct lowcore {
uint8_t pad_0x0000[0x0080 - 0x0000]; /* 0x0000 */
uint32_t ext_int_param; /* 0x0080 */
diff --git a/lib/s390x/asm/interrupt.h b/lib/s390x/asm/interrupt.h
index f485e96..4cfade9 100644
--- a/lib/s390x/asm/interrupt.h
+++ b/lib/s390x/asm/interrupt.h
@@ -11,6 +11,8 @@
#define _ASMS390X_IRQ_H_
#include <asm/arch_def.h>

+#define EXT_IRQ_EMERGENCY_SIG 0x1201
+#define EXT_IRQ_EXTERNAL_CALL 0x1202
#define EXT_IRQ_SERVICE_SIG 0x2401

void handle_pgm_int(void);
@@ -19,6 +21,7 @@ void handle_mcck_int(void);
void handle_io_int(void);
void handle_svc_int(void);
void expect_pgm_int(void);
+void expect_ext_int(void);
uint16_t clear_pgm_int(void);
void check_pgm_int_code(uint16_t code);

diff --git a/lib/s390x/interrupt.c b/lib/s390x/interrupt.c
index 7832711..d4f279a 100644
--- a/lib/s390x/interrupt.c
+++ b/lib/s390x/interrupt.c
@@ -15,6 +15,7 @@
#include <sclp.h>

static bool pgm_int_expected;
+static bool ext_int_expected;
static struct lowcore *lc;

void expect_pgm_int(void)
@@ -24,6 +25,13 @@ void expect_pgm_int(void)
mb();
}

+void expect_ext_int(void)
+{
+ ext_int_expected = true;
+ lc->ext_int_code = 0;
+ mb();
+}
+
uint16_t clear_pgm_int(void)
{
uint16_t code;
@@ -108,15 +116,23 @@ void handle_pgm_int(void)

void handle_ext_int(void)
{
- if (lc->ext_int_code != EXT_IRQ_SERVICE_SIG) {
+ if (!ext_int_expected &&
+ lc->ext_int_code != EXT_IRQ_SERVICE_SIG) {
report_abort("Unexpected external call interrupt: at %#lx",
lc->ext_old_psw.addr);
- } else {
- lc->ext_old_psw.mask &= ~PSW_MASK_EXT;
+ return;
+ }
+
+ if (lc->ext_int_code == EXT_IRQ_SERVICE_SIG) {
lc->sw_int_cr0 &= ~(1UL << 9);
sclp_handle_ext();
- lc->ext_int_code = 0;
}
+ if (lc->ext_int_code != EXT_IRQ_SERVICE_SIG) {
+ ext_int_expected = false;
+ }
+
+ if (!(lc->sw_int_cr0 & CR0_EXTM_MASK))
+ lc->ext_old_psw.mask &= ~PSW_MASK_EXT;
}

void handle_mcck_int(void)
--
2.17.0