[PATCH v4 0/9] pc-bios: s390x: Cleanup part 1

[PATCH v4 0/9] pc-bios: s390x: Cleanup part 1

[Janosch Frank]

The bios is in dire need for a cleanup as there are still a lot of
magic constants being used throughout as well as duplicated code.

In the first part of this series we consolidate constants and
functions, as well as doing some minor cleanups and fixes.

The patches are available here:
https://github.com/frankjaa/qemu/pull/new/cleanup_bios

v4:
	* Renamed time.h to s390-time.h
	* Fixed function names in sleep()
	* Changed order of sense_id_ccw initialization
	* Added missing include before sleep()

v3:
	* Dropped 0x00 to 0x0/0 patch
	* Moved some timing functions into helper.h instead of time.h
	* Fixed IPL psw manipulation in dasd-ipl.c
 	* Minor cosmetic fixes found by review

v2:
	* Included cio fixup to get rid of compile errors...
	* Minor cosmetic fixes found by review

Janosch Frank (9):
  pc-bios: s390x: cio.c cleanup and compile fix
  pc-bios: s390x: Consolidate timing functions into time.h
  pc-bios: s390x: Move sleep and yield to helper.h
  pc-bios: s390x: Get rid of magic offsets into the lowcore
  pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant
  pc-bios: s390x: Use PSW masks where possible and introduce
    PSW_MASK_SHORT_ADDR
  pc-bios: s390x: Move panic() into header and add infinite loop
  pc-bios: s390x: Use ebcdic2ascii table
  pc-bios: s390x: Make u32 ptr check explicit

 pc-bios/s390-ccw/bootmap.c     |  4 +---
 pc-bios/s390-ccw/cio.c         | 40 +++++++++++++++++++---------------
 pc-bios/s390-ccw/cio.h         | 17 ++++++++++-----
 pc-bios/s390-ccw/dasd-ipl.c    |  5 ++---
 pc-bios/s390-ccw/helper.h      | 19 +++++++++++++++-
 pc-bios/s390-ccw/jump2ipl.c    | 10 ++++-----
 pc-bios/s390-ccw/main.c        | 15 +++----------
 pc-bios/s390-ccw/menu.c        |  1 +
 pc-bios/s390-ccw/netmain.c     | 23 +++----------------
 pc-bios/s390-ccw/s390-arch.h   |  4 +++-
 pc-bios/s390-ccw/s390-ccw.h    | 27 ++++++-----------------
 pc-bios/s390-ccw/s390-time.h   | 23 +++++++++++++++++++
 pc-bios/s390-ccw/start.S       |  5 +++--
 pc-bios/s390-ccw/virtio-net.c  |  2 ++
 pc-bios/s390-ccw/virtio-scsi.c |  2 ++
 pc-bios/s390-ccw/virtio.c      | 18 +++------------
 16 files changed, 108 insertions(+), 107 deletions(-)
 create mode 100644 pc-bios/s390-ccw/s390-time.h

-- 
2.25.1

[PATCH v4 1/9] pc-bios: s390x: cio.c cleanup and compile fix

[Janosch Frank]

Let's initialize the structs at the beginning to ease reading and also
zeroing all other fields. This also makes the compiler stop
complaining about sense_id_ccw.flags being ored into when it's not
initialized.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 pc-bios/s390-ccw/cio.c | 40 ++++++++++++++++++++++------------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/pc-bios/s390-ccw/cio.c b/pc-bios/s390-ccw/cio.c
index 339ec5fbe7..83ca27ab41 100644
--- a/pc-bios/s390-ccw/cio.c
+++ b/pc-bios/s390-ccw/cio.c
@@ -49,13 +49,13 @@ void enable_subchannel(SubChannelId schid)
 
 uint16_t cu_type(SubChannelId schid)
 {
-    Ccw1 sense_id_ccw;
     SenseId sense_data;
-
-    sense_id_ccw.cmd_code = CCW_CMD_SENSE_ID;
-    sense_id_ccw.cda = ptr2u32(&sense_data);
-    sense_id_ccw.count = sizeof(sense_data);
-    sense_id_ccw.flags |= CCW_FLAG_SLI;
+    Ccw1 sense_id_ccw = {
+        .cmd_code = CCW_CMD_SENSE_ID,
+        .flags = CCW_FLAG_SLI,
+        .count = sizeof(sense_data),
+        .cda = ptr2u32(&sense_data),
+    };
 
     if (do_cio(schid, CU_TYPE_UNKNOWN, ptr2u32(&sense_id_ccw), CCW_FMT1)) {
         panic("Failed to run SenseID CCw\n");
@@ -67,13 +67,13 @@ uint16_t cu_type(SubChannelId schid)
 int basic_sense(SubChannelId schid, uint16_t cutype, void *sense_data,
                  uint16_t data_size)
 {
-    Ccw1 senseCcw;
+    Ccw1 senseCcw = {
+        .cmd_code = CCW_CMD_BASIC_SENSE,
+        .count = data_size,
+        .cda = ptr2u32(sense_data),
+    };
     Irb irb;
 
-    senseCcw.cmd_code = CCW_CMD_BASIC_SENSE;
-    senseCcw.cda = ptr2u32(sense_data);
-    senseCcw.count = data_size;
-
     return __do_cio(schid, ptr2u32(&senseCcw), CCW_FMT1, &irb);
 }
 
@@ -314,7 +314,17 @@ static void print_irb_err(Irb *irb)
  */
 static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
 {
-    CmdOrb orb = {};
+    /*
+     * QEMU's CIO implementation requires prefetch and 64-bit idaws. We
+     * allow all paths.
+     */
+    CmdOrb orb = {
+        .fmt = fmt,
+        .pfch = 1,
+        .c64 = 1,
+        .lpm = 0xFF,
+        .cpa = ccw_addr,
+    };
     int rc;
 
     IPL_assert(fmt == 0 || fmt == 1, "Invalid ccw format");
@@ -324,12 +334,6 @@ static int __do_cio(SubChannelId schid, uint32_t ccw_addr, int fmt, Irb *irb)
         IPL_assert(ccw_addr <= 0xFFFFFF - 8, "Invalid ccw address");
     }
 
-    orb.fmt = fmt;
-    orb.pfch = 1;  /* QEMU's cio implementation requires prefetch */
-    orb.c64 = 1;   /* QEMU's cio implementation requires 64-bit idaws */
-    orb.lpm = 0xFF; /* All paths allowed */
-    orb.cpa = ccw_addr;
-
     rc = ssch(schid, &orb);
     if (rc == 1 || rc == 2) {
         /* Subchannel status pending or busy. Eat status and ask for retry. */
-- 
2.25.1

[PATCH v4 2/9] pc-bios: s390x: Consolidate timing functions into time.h

[Janosch Frank]

Let's consolidate timing related functions into one header.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 pc-bios/s390-ccw/menu.c        |  1 +
 pc-bios/s390-ccw/netmain.c     | 15 +++------------
 pc-bios/s390-ccw/s390-ccw.h    |  8 ++++----
 pc-bios/s390-ccw/s390-time.h   | 23 +++++++++++++++++++++++
 pc-bios/s390-ccw/virtio-net.c  |  1 +
 pc-bios/s390-ccw/virtio-scsi.c |  1 +
 pc-bios/s390-ccw/virtio.c      | 18 +++---------------
 7 files changed, 36 insertions(+), 31 deletions(-)
 create mode 100644 pc-bios/s390-ccw/s390-time.h

diff --git a/pc-bios/s390-ccw/menu.c b/pc-bios/s390-ccw/menu.c
index ce3815b201..de8260a5d6 100644
--- a/pc-bios/s390-ccw/menu.c
+++ b/pc-bios/s390-ccw/menu.c
@@ -12,6 +12,7 @@
 #include "libc.h"
 #include "s390-ccw.h"
 #include "sclp.h"
+#include "s390-time.h"
 
 #define KEYCODE_NO_INP '\0'
 #define KEYCODE_ESCAPE '\033'
diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
index 309ffa30d9..f1ee63577a 100644
--- a/pc-bios/s390-ccw/netmain.c
+++ b/pc-bios/s390-ccw/netmain.c
@@ -35,6 +35,7 @@
 #include "s390-ccw.h"
 #include "cio.h"
 #include "virtio.h"
+#include "s390-time.h"
 
 #define DEFAULT_BOOT_RETRIES 10
 #define DEFAULT_TFTP_RETRIES 20
@@ -57,24 +58,14 @@ static SubChannelId net_schid = { .one = 1 };
 static uint8_t mac[6];
 static uint64_t dest_timer;
 
-static uint64_t get_timer_ms(void)
-{
-    uint64_t clk;
-
-    asm volatile(" stck %0 " : : "Q"(clk) : "memory");
-
-    /* Bit 51 is incremented each microsecond */
-    return (clk >> (63 - 51)) / 1000;
-}
-
 void set_timer(int val)
 {
-    dest_timer = get_timer_ms() + val;
+    dest_timer = get_time_ms() + val;
 }
 
 int get_timer(void)
 {
-    return dest_timer - get_timer_ms();
+    return dest_timer - get_time_ms();
 }
 
 int get_sec_ticks(void)
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index 21f27e7990..fae1de363f 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -74,8 +74,6 @@ unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
 bool virtio_is_supported(SubChannelId schid);
 void virtio_blk_setup_device(SubChannelId schid);
 int virtio_read(ulong sector, void *load_addr);
-u64 get_clock(void);
-ulong get_second(void);
 
 /* bootmap.c */
 void zipl_load(void);
@@ -153,11 +151,13 @@ static inline void yield(void)
 
 #define MAX_SECTOR_SIZE 4096
 
+#include "s390-time.h"
+
 static inline void sleep(unsigned int seconds)
 {
-    ulong target = get_second() + seconds;
+    ulong target = get_time_seconds() + seconds;
 
-    while (get_second() < target) {
+    while (get_time_seconds() < target) {
         yield();
     }
 }
diff --git a/pc-bios/s390-ccw/s390-time.h b/pc-bios/s390-ccw/s390-time.h
new file mode 100644
index 0000000000..ed6d982371
--- /dev/null
+++ b/pc-bios/s390-ccw/s390-time.h
@@ -0,0 +1,23 @@
+#ifndef TIME_H
+#define TIME_H
+
+static inline u64 get_clock(void)
+{
+    u64 r;
+
+    asm volatile("stck %0" : "=Q" (r) : : "cc");
+    return r;
+}
+
+static inline u64 get_time_ms(void)
+{
+    /* Bit 51 is incremented each microsecond */
+    return (get_clock() >> 12) / 1000;
+}
+
+static inline u64 get_time_seconds(void)
+{
+    return get_time_ms() / 1000;
+}
+
+#endif
diff --git a/pc-bios/s390-ccw/virtio-net.c b/pc-bios/s390-ccw/virtio-net.c
index ff7f4dad25..a13f3b6fb9 100644
--- a/pc-bios/s390-ccw/virtio-net.c
+++ b/pc-bios/s390-ccw/virtio-net.c
@@ -19,6 +19,7 @@
 #include <ethernet.h>
 #include "s390-ccw.h"
 #include "virtio.h"
+#include "s390-time.h"
 
 #ifndef DEBUG_VIRTIO_NET
 #define DEBUG_VIRTIO_NET 0
diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c
index 4fe4b9d261..7bf0be4ffa 100644
--- a/pc-bios/s390-ccw/virtio-scsi.c
+++ b/pc-bios/s390-ccw/virtio-scsi.c
@@ -14,6 +14,7 @@
 #include "virtio.h"
 #include "scsi.h"
 #include "virtio-scsi.h"
+#include "s390-time.h"
 
 static ScsiDevice default_scsi_device;
 static VirtioScsiCmdReq req;
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index fb40ca9828..ab49840db8 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -15,6 +15,7 @@
 #include "virtio-scsi.h"
 #include "bswap.h"
 #include "helper.h"
+#include "s390-time.h"
 
 #define VRING_WAIT_REPLY_TIMEOUT 30
 
@@ -157,19 +158,6 @@ void vring_send_buf(VRing *vr, void *p, int len, int flags)
     }
 }
 
-u64 get_clock(void)
-{
-    u64 r;
-
-    asm volatile("stck %0" : "=Q" (r) : : "cc");
-    return r;
-}
-
-ulong get_second(void)
-{
-    return (get_clock() >> 12) / 1000000;
-}
-
 int vr_poll(VRing *vr)
 {
     if (vr->used->idx == vr->used_idx) {
@@ -194,7 +182,7 @@ int vr_poll(VRing *vr)
  */
 int vring_wait_reply(void)
 {
-    ulong target_second = get_second() + vdev.wait_reply_timeout;
+    ulong target_second = get_time_seconds() + vdev.wait_reply_timeout;
 
     /* Wait for any queue to be updated by the host */
     do {
@@ -207,7 +195,7 @@ int vring_wait_reply(void)
         if (r) {
             return 0;
         }
-    } while (!vdev.wait_reply_timeout || (get_second() < target_second));
+    } while (!vdev.wait_reply_timeout || (get_time_seconds() < target_second));
 
     return 1;
 }
-- 
2.25.1

[PATCH v4 3/9] pc-bios: s390x: Move sleep and yield to helper.h

[Janosch Frank]

They are definitely helper functions.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 pc-bios/s390-ccw/helper.h      | 17 +++++++++++++++++
 pc-bios/s390-ccw/s390-ccw.h    | 18 ------------------
 pc-bios/s390-ccw/virtio-net.c  |  1 +
 pc-bios/s390-ccw/virtio-scsi.c |  1 +
 4 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/pc-bios/s390-ccw/helper.h b/pc-bios/s390-ccw/helper.h
index 78d5bc7442..32a453b634 100644
--- a/pc-bios/s390-ccw/helper.h
+++ b/pc-bios/s390-ccw/helper.h
@@ -14,6 +14,7 @@
 #define S390_CCW_HELPER_H
 
 #include "s390-ccw.h"
+#include "s390-time.h"
 
 /* Avoids compiler warnings when casting a pointer to a u32 */
 static inline uint32_t ptr2u32(void *ptr)
@@ -28,4 +29,20 @@ static inline void *u32toptr(uint32_t n)
     return (void *)(uint64_t)n;
 }
 
+static inline void yield(void)
+{
+    asm volatile ("diag 0,0,0x44"
+                  : :
+                  : "memory", "cc");
+}
+
+static inline void sleep(unsigned int seconds)
+{
+    ulong target = get_time_seconds() + seconds;
+
+    while (get_time_seconds() < target) {
+        yield();
+    }
+}
+
 #endif
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index fae1de363f..c5820e43ae 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -142,26 +142,8 @@ static inline void debug_print_addr(const char *desc, void *p)
 #define KVM_S390_VIRTIO_SET_STATUS      2
 #define KVM_S390_VIRTIO_CCW_NOTIFY      3
 
-static inline void yield(void)
-{
-    asm volatile ("diag 0,0,0x44"
-                  : :
-                  : "memory", "cc");
-}
-
 #define MAX_SECTOR_SIZE 4096
 
-#include "s390-time.h"
-
-static inline void sleep(unsigned int seconds)
-{
-    ulong target = get_time_seconds() + seconds;
-
-    while (get_time_seconds() < target) {
-        yield();
-    }
-}
-
 static inline void IPL_assert(bool term, const char *message)
 {
     if (!term) {
diff --git a/pc-bios/s390-ccw/virtio-net.c b/pc-bios/s390-ccw/virtio-net.c
index a13f3b6fb9..2fcb0a58c5 100644
--- a/pc-bios/s390-ccw/virtio-net.c
+++ b/pc-bios/s390-ccw/virtio-net.c
@@ -20,6 +20,7 @@
 #include "s390-ccw.h"
 #include "virtio.h"
 #include "s390-time.h"
+#include "helper.h"
 
 #ifndef DEBUG_VIRTIO_NET
 #define DEBUG_VIRTIO_NET 0
diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c
index 7bf0be4ffa..eddfb8a7ad 100644
--- a/pc-bios/s390-ccw/virtio-scsi.c
+++ b/pc-bios/s390-ccw/virtio-scsi.c
@@ -15,6 +15,7 @@
 #include "scsi.h"
 #include "virtio-scsi.h"
 #include "s390-time.h"
+#include "helper.h"
 
 static ScsiDevice default_scsi_device;
 static VirtioScsiCmdReq req;
-- 
2.25.1

[PATCH v4 4/9] pc-bios: s390x: Get rid of magic offsets into the lowcore

[Janosch Frank]

If we have a lowcore struct that has members for offsets that we want
to touch, why not use it?

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 pc-bios/s390-ccw/cio.h  | 17 +++++++++++------
 pc-bios/s390-ccw/main.c |  8 +++-----
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/pc-bios/s390-ccw/cio.h b/pc-bios/s390-ccw/cio.h
index aaa432dedd..1e5d4e92e1 100644
--- a/pc-bios/s390-ccw/cio.h
+++ b/pc-bios/s390-ccw/cio.h
@@ -122,12 +122,17 @@ typedef struct schib {
 } __attribute__ ((packed, aligned(4))) Schib;
 
 typedef struct subchannel_id {
-        __u32 cssid:8;
-        __u32:4;
-        __u32 m:1;
-        __u32 ssid:2;
-        __u32 one:1;
-        __u32 sch_no:16;
+    union {
+        struct {
+            __u16 cssid:8;
+            __u16 reserved:4;
+            __u16 m:1;
+            __u16 ssid:2;
+            __u16 one:1;
+        };
+        __u16 sch_id;
+    };
+    __u16 sch_no;
 } __attribute__ ((packed, aligned(4))) SubChannelId;
 
 struct chsc_header {
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 4e65b411e1..8b912454c9 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -36,11 +36,9 @@ LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */
  */
 void write_subsystem_identification(void)
 {
-    SubChannelId *schid = (SubChannelId *) 184;
-    uint32_t *zeroes = (uint32_t *) 188;
-
-    *schid = blk_schid;
-    *zeroes = 0;
+    lowcore->subchannel_id = blk_schid.sch_id;
+    lowcore->subchannel_nr = blk_schid.sch_no;
+    lowcore->io_int_parm = 0;
 }
 
 void write_iplb_location(void)
-- 
2.25.1

[PATCH v4 5/9] pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant

[Janosch Frank]

ZMODE has a lot of ambiguity with the ESAME architecture mode, but is
actually 64 bit addressing.

As PSW_MASK_64 is now effectively 33 bit long and the PSWLegacy struct
has 2 32 bit members, let's also use a unsigned long pointer in
dasd-ipl.c instead when oring the constant into a 8 byte PSW.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 pc-bios/s390-ccw/dasd-ipl.c  | 5 ++---
 pc-bios/s390-ccw/s390-arch.h | 2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c
index 0fc879bb8e..0dbad051a2 100644
--- a/pc-bios/s390-ccw/dasd-ipl.c
+++ b/pc-bios/s390-ccw/dasd-ipl.c
@@ -206,7 +206,7 @@ static void run_ipl2(SubChannelId schid, uint16_t cutype, uint32_t addr)
  */
 void dasd_ipl(SubChannelId schid, uint16_t cutype)
 {
-    PSWLegacy *pswl = (PSWLegacy *) 0x00;
+    unsigned long *pswl = 0x0;
     uint32_t ipl2_addr;
 
     /* Construct Read IPL CCW and run it to read IPL1 from boot disk */
@@ -229,7 +229,6 @@ void dasd_ipl(SubChannelId schid, uint16_t cutype)
     run_ipl2(schid, cutype, ipl2_addr);
 
     /* Transfer control to the guest operating system */
-    pswl->mask |= PSW_MASK_EAMODE;   /* Force z-mode */
-    pswl->addr |= PSW_MASK_BAMODE;   /* ...          */
+    *pswl |= PSW_MASK_64;   /* Force 64 bit addressing */
     jump_to_low_kernel();
 }
diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
index 5f36361c02..73852029d4 100644
--- a/pc-bios/s390-ccw/s390-arch.h
+++ b/pc-bios/s390-ccw/s390-arch.h
@@ -29,7 +29,7 @@ _Static_assert(sizeof(struct PSWLegacy) == 8, "PSWLegacy size incorrect");
 #define PSW_MASK_WAIT       0x0002000000000000ULL
 #define PSW_MASK_EAMODE     0x0000000100000000ULL
 #define PSW_MASK_BAMODE     0x0000000080000000ULL
-#define PSW_MASK_ZMODE      (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
+#define PSW_MASK_64         (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
 
 /* Low core mapping */
 typedef struct LowCore {
-- 
2.25.1

[PATCH v4 6/9] pc-bios: s390x: Use PSW masks where possible and introduce PSW_MASK_SHORT_ADDR

[Janosch Frank]

Let's move some of the PSW mask defines into s390-arch.h and use them
in jump2ipl.c. Also let's introduce a new constant for the address
mask of 8 byte (short) PSWs.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 pc-bios/s390-ccw/jump2ipl.c  | 10 ++++------
 pc-bios/s390-ccw/s390-arch.h |  2 ++
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
index 4eba2510b0..767012bf0c 100644
--- a/pc-bios/s390-ccw/jump2ipl.c
+++ b/pc-bios/s390-ccw/jump2ipl.c
@@ -8,12 +8,10 @@
 
 #include "libc.h"
 #include "s390-ccw.h"
+#include "s390-arch.h"
 
 #define KERN_IMAGE_START 0x010000UL
-#define PSW_MASK_64 0x0000000100000000ULL
-#define PSW_MASK_32 0x0000000080000000ULL
-#define PSW_MASK_SHORTPSW 0x0008000000000000ULL
-#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_32 | PSW_MASK_64)
+#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64)
 
 typedef struct ResetInfo {
     uint64_t ipl_psw;
@@ -54,7 +52,7 @@ void jump_to_IPL_code(uint64_t address)
 
     current->ipl_psw = (uint64_t) &jump_to_IPL_2;
     current->ipl_psw |= RESET_PSW_MASK;
-    current->ipl_continue = address & 0x7fffffff;
+    current->ipl_continue = address & PSW_MASK_SHORT_ADDR;
 
     debug_print_int("set IPL addr to", current->ipl_continue);
 
@@ -86,7 +84,7 @@ void jump_to_low_kernel(void)
 
     /* Trying to get PSW at zero address */
     if (*((uint64_t *)0) & RESET_PSW_MASK) {
-        jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff);
+        jump_to_IPL_code((*((uint64_t *)0)) & PSW_MASK_SHORT_ADDR);
     }
 
     /* No other option left, so use the Linux kernel start address */
diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
index 73852029d4..6da44d4436 100644
--- a/pc-bios/s390-ccw/s390-arch.h
+++ b/pc-bios/s390-ccw/s390-arch.h
@@ -26,9 +26,11 @@ _Static_assert(sizeof(struct PSWLegacy) == 8, "PSWLegacy size incorrect");
 
 /* s390 psw bit masks */
 #define PSW_MASK_IOINT      0x0200000000000000ULL
+#define PSW_MASK_SHORTPSW   0x0008000000000000ULL
 #define PSW_MASK_WAIT       0x0002000000000000ULL
 #define PSW_MASK_EAMODE     0x0000000100000000ULL
 #define PSW_MASK_BAMODE     0x0000000080000000ULL
+#define PSW_MASK_SHORT_ADDR 0x000000007fffffffULL
 #define PSW_MASK_64         (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
 
 /* Low core mapping */
-- 
2.25.1

[PATCH v4 7/9] pc-bios: s390x: Move panic() into header and add infinite loop

[Janosch Frank]

panic() was defined for the ccw and net bios, i.e. twice, so it's
cleaner to rather put it into the header.

Also let's add an infinite loop into the assembly of disabled_wait() so
the caller doesn't need to take care of it.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/main.c     | 7 -------
 pc-bios/s390-ccw/netmain.c  | 8 --------
 pc-bios/s390-ccw/s390-ccw.h | 9 +++++++--
 pc-bios/s390-ccw/start.S    | 5 +++--
 4 files changed, 10 insertions(+), 19 deletions(-)

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index 8b912454c9..146a50760b 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -46,13 +46,6 @@ void write_iplb_location(void)
     lowcore->ptr_iplb = ptr2u32(&iplb);
 }
 
-void panic(const char *string)
-{
-    sclp_print(string);
-    disabled_wait();
-    while (1) { }
-}
-
 unsigned int get_loadparm_index(void)
 {
     return atoui(loadparm_str);
diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
index f1ee63577a..056e93a818 100644
--- a/pc-bios/s390-ccw/netmain.c
+++ b/pc-bios/s390-ccw/netmain.c
@@ -439,14 +439,6 @@ static int net_try_direct_tftp_load(filename_ip_t *fn_ip)
     return rc;
 }
 
-void panic(const char *string)
-{
-    sclp_print(string);
-    for (;;) {
-        disabled_wait();
-    }
-}
-
 void write_subsystem_identification(void)
 {
     SubChannelId *schid = (SubChannelId *) 184;
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index c5820e43ae..36b884cced 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -50,12 +50,11 @@ typedef unsigned long long __u64;
 #include "iplb.h"
 
 /* start.s */
-void disabled_wait(void);
+void disabled_wait(void) __attribute__ ((__noreturn__));
 void consume_sclp_int(void);
 void consume_io_int(void);
 
 /* main.c */
-void panic(const char *string);
 void write_subsystem_identification(void);
 void write_iplb_location(void);
 extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE)));
@@ -91,6 +90,12 @@ bool menu_is_enabled_enum(void);
 
 #define MAX_BOOT_ENTRIES  31
 
+static inline void panic(const char *string)
+{
+    sclp_print(string);
+    disabled_wait();
+}
+
 static inline void fill_hex(char *out, unsigned char val)
 {
     const char hex[] = "0123456789abcdef";
diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
index aa8fceb19d..35be141d8d 100644
--- a/pc-bios/s390-ccw/start.S
+++ b/pc-bios/s390-ccw/start.S
@@ -47,8 +47,9 @@ memsetxc:
  */
 	.globl disabled_wait
 disabled_wait:
-        larl %r1,disabled_wait_psw
-        lpswe   0(%r1)
+        larl	%r1,disabled_wait_psw
+        lpswe	0(%r1)
+1:	j	1b
 
 
 /*
-- 
2.25.1

[PATCH v4 8/9] pc-bios: s390x: Use ebcdic2ascii table

[Janosch Frank]

Why should we do conversion of a ebcdic value if we have a handy table
where we could look up the ascii value instead?

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/bootmap.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index d13b7cbd15..97205674e5 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -328,9 +328,7 @@ static void print_eckd_ldl_msg(ECKD_IPL_mode_t mode)
         msg[0] = '2';
         break;
     default:
-        msg[0] = vlbl->LDL_version;
-        msg[0] &= 0x0f; /* convert EBCDIC   */
-        msg[0] |= 0x30; /* to ASCII (digit) */
+        msg[0] = ebc2asc[vlbl->LDL_version];
         msg[1] = '?';
         break;
     }
-- 
2.25.1

[PATCH v4 9/9] pc-bios: s390x: Make u32 ptr check explicit

[Janosch Frank]

Let's make it a bit more clear that we check the full 64 bits to fit
into the 32 we return.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/helper.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pc-bios/s390-ccw/helper.h b/pc-bios/s390-ccw/helper.h
index 32a453b634..dfcfea0ff0 100644
--- a/pc-bios/s390-ccw/helper.h
+++ b/pc-bios/s390-ccw/helper.h
@@ -19,7 +19,7 @@
 /* Avoids compiler warnings when casting a pointer to a u32 */
 static inline uint32_t ptr2u32(void *ptr)
 {
-    IPL_assert((uint64_t)ptr <= 0xffffffff, "ptr2u32: ptr too large");
+    IPL_assert((uint64_t)ptr <= 0xffffffffull, "ptr2u32: ptr too large");
     return (uint32_t)(uint64_t)ptr;
 }
 
-- 
2.25.1

Re: [PATCH v4 0/9] pc-bios: s390x: Cleanup part 1

[no-reply]

Patchew URL: https://patchew.org/QEMU/20200622074235.32528-1-frankja@linux.ibm.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Subject: [PATCH v4 0/9] pc-bios: s390x: Cleanup part 1
Type: series
Message-id: 20200622074235.32528-1-frankja@linux.ibm.com

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

Switched to a new branch 'test'
1e3716e pc-bios: s390x: Make u32 ptr check explicit
e1bae54 pc-bios: s390x: Use ebcdic2ascii table
7452b5e pc-bios: s390x: Move panic() into header and add infinite loop
6cdcbc6 pc-bios: s390x: Use PSW masks where possible and introduce PSW_MASK_SHORT_ADDR
6c39b23 pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant
91817a3 pc-bios: s390x: Get rid of magic offsets into the lowcore
a6afbef pc-bios: s390x: Move sleep and yield to helper.h
aa61b56 pc-bios: s390x: Consolidate timing functions into time.h
103f588 pc-bios: s390x: cio.c cleanup and compile fix

=== OUTPUT BEGIN ===
1/9 Checking commit 103f588d1ee8 (pc-bios: s390x: cio.c cleanup and compile fix)
2/9 Checking commit aa61b56a0eea (pc-bios: s390x: Consolidate timing functions into time.h)
WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
#93: 
new file mode 100644

total: 0 errors, 1 warnings, 142 lines checked

Patch 2/9 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.
3/9 Checking commit a6afbefa38ab (pc-bios: s390x: Move sleep and yield to helper.h)
4/9 Checking commit 91817a34ed26 (pc-bios: s390x: Get rid of magic offsets into the lowcore)
ERROR: spaces required around that ':' (ctx:VxV)
#30: FILE: pc-bios/s390-ccw/cio.h:127:
+            __u16 cssid:8;
                        ^

ERROR: spaces required around that ':' (ctx:VxV)
#31: FILE: pc-bios/s390-ccw/cio.h:128:
+            __u16 reserved:4;
                           ^

ERROR: spaces required around that ':' (ctx:VxV)
#32: FILE: pc-bios/s390-ccw/cio.h:129:
+            __u16 m:1;
                    ^

ERROR: spaces required around that ':' (ctx:VxV)
#33: FILE: pc-bios/s390-ccw/cio.h:130:
+            __u16 ssid:2;
                       ^

ERROR: spaces required around that ':' (ctx:VxV)
#34: FILE: pc-bios/s390-ccw/cio.h:131:
+            __u16 one:1;
                      ^

total: 5 errors, 0 warnings, 37 lines checked

Patch 4/9 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

5/9 Checking commit 6c39b233de50 (pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant)
6/9 Checking commit 6cdcbc6075b0 (pc-bios: s390x: Use PSW masks where possible and introduce PSW_MASK_SHORT_ADDR)
7/9 Checking commit 7452b5e64c9a (pc-bios: s390x: Move panic() into header and add infinite loop)
8/9 Checking commit e1bae544390e (pc-bios: s390x: Use ebcdic2ascii table)
9/9 Checking commit 1e3716e19075 (pc-bios: s390x: Make u32 ptr check explicit)
=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/20200622074235.32528-1-frankja@linux.ibm.com/testing.checkpatch/?type=message.
---
Email generated automatically by Patchew [https://patchew.org/].
Please send your feedback to patchew-devel@redhat.com

Re: [PATCH v4 2/9] pc-bios: s390x: Consolidate timing functions into time.h

[Thomas Huth]

On 22/06/2020 09.42, Janosch Frank wrote:
> Let's consolidate timing related functions into one header.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>  pc-bios/s390-ccw/menu.c        |  1 +
>  pc-bios/s390-ccw/netmain.c     | 15 +++------------
>  pc-bios/s390-ccw/s390-ccw.h    |  8 ++++----
>  pc-bios/s390-ccw/s390-time.h   | 23 +++++++++++++++++++++++
>  pc-bios/s390-ccw/virtio-net.c  |  1 +
>  pc-bios/s390-ccw/virtio-scsi.c |  1 +
>  pc-bios/s390-ccw/virtio.c      | 18 +++---------------
>  7 files changed, 36 insertions(+), 31 deletions(-)
>  create mode 100644 pc-bios/s390-ccw/s390-time.h
> 
> diff --git a/pc-bios/s390-ccw/menu.c b/pc-bios/s390-ccw/menu.c
> index ce3815b201..de8260a5d6 100644
> --- a/pc-bios/s390-ccw/menu.c
> +++ b/pc-bios/s390-ccw/menu.c
> @@ -12,6 +12,7 @@
>  #include "libc.h"
>  #include "s390-ccw.h"
>  #include "sclp.h"
> +#include "s390-time.h"

You could maybe drop these additional includes...

> diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
> index 21f27e7990..fae1de363f 100644
> --- a/pc-bios/s390-ccw/s390-ccw.h
> +++ b/pc-bios/s390-ccw/s390-ccw.h
> @@ -74,8 +74,6 @@ unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
>  bool virtio_is_supported(SubChannelId schid);
>  void virtio_blk_setup_device(SubChannelId schid);
>  int virtio_read(ulong sector, void *load_addr);
> -u64 get_clock(void);
> -ulong get_second(void);
>  
>  /* bootmap.c */
>  void zipl_load(void);
> @@ -153,11 +151,13 @@ static inline void yield(void)
>  
>  #define MAX_SECTOR_SIZE 4096
>  
> +#include "s390-time.h"

... since you already include s390-time.h here in this central header
file...

>  static inline void sleep(unsigned int seconds)
>  {
> -    ulong target = get_second() + seconds;
> +    ulong target = get_time_seconds() + seconds;
>  
> -    while (get_second() < target) {
> +    while (get_time_seconds() < target) {
>          yield();
>      }
>  }

... or you could move the sleep() function into s390-time.h, too?

Anyway, both ways are fine for me, so:

Acked-by: Thomas Huth <thuth@redhat.com>

Re: [PATCH v4 2/9] pc-bios: s390x: Consolidate timing functions into time.h

[Thomas Huth]

On 22/06/2020 12.02, Thomas Huth wrote:
> On 22/06/2020 09.42, Janosch Frank wrote:
>> Let's consolidate timing related functions into one header.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> ---
>>  pc-bios/s390-ccw/menu.c        |  1 +
>>  pc-bios/s390-ccw/netmain.c     | 15 +++------------
>>  pc-bios/s390-ccw/s390-ccw.h    |  8 ++++----
>>  pc-bios/s390-ccw/s390-time.h   | 23 +++++++++++++++++++++++
>>  pc-bios/s390-ccw/virtio-net.c  |  1 +
>>  pc-bios/s390-ccw/virtio-scsi.c |  1 +
>>  pc-bios/s390-ccw/virtio.c      | 18 +++---------------
>>  7 files changed, 36 insertions(+), 31 deletions(-)
>>  create mode 100644 pc-bios/s390-ccw/s390-time.h
>>
>> diff --git a/pc-bios/s390-ccw/menu.c b/pc-bios/s390-ccw/menu.c
>> index ce3815b201..de8260a5d6 100644
>> --- a/pc-bios/s390-ccw/menu.c
>> +++ b/pc-bios/s390-ccw/menu.c
>> @@ -12,6 +12,7 @@
>>  #include "libc.h"
>>  #include "s390-ccw.h"
>>  #include "sclp.h"
>> +#include "s390-time.h"
> 
> You could maybe drop these additional includes...
> 
>> diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
>> index 21f27e7990..fae1de363f 100644
>> --- a/pc-bios/s390-ccw/s390-ccw.h
>> +++ b/pc-bios/s390-ccw/s390-ccw.h
>> @@ -74,8 +74,6 @@ unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
>>  bool virtio_is_supported(SubChannelId schid);
>>  void virtio_blk_setup_device(SubChannelId schid);
>>  int virtio_read(ulong sector, void *load_addr);
>> -u64 get_clock(void);
>> -ulong get_second(void);
>>  
>>  /* bootmap.c */
>>  void zipl_load(void);
>> @@ -153,11 +151,13 @@ static inline void yield(void)
>>  
>>  #define MAX_SECTOR_SIZE 4096
>>  
>> +#include "s390-time.h"
> 
> ... since you already include s390-time.h here in this central header
> file...
> 
>>  static inline void sleep(unsigned int seconds)
>>  {
>> -    ulong target = get_second() + seconds;
>> +    ulong target = get_time_seconds() + seconds;
>>  
>> -    while (get_second() < target) {
>> +    while (get_time_seconds() < target) {
>>          yield();
>>      }
>>  }
> 
> ... or you could move the sleep() function into s390-time.h, too?

Never mind, I just saw that you move it in the next patch to a different
header. That's fine.

 Thomas

Re: [PATCH v4 3/9] pc-bios: s390x: Move sleep and yield to helper.h

[Thomas Huth]

On 22/06/2020 09.42, Janosch Frank wrote:
> They are definitely helper functions.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  pc-bios/s390-ccw/helper.h      | 17 +++++++++++++++++
>  pc-bios/s390-ccw/s390-ccw.h    | 18 ------------------
>  pc-bios/s390-ccw/virtio-net.c  |  1 +
>  pc-bios/s390-ccw/virtio-scsi.c |  1 +
>  4 files changed, 19 insertions(+), 18 deletions(-)
Reviewed-by: Thomas Huth <thuth@redhat.com>

Re: [PATCH v4 3/9] pc-bios: s390x: Move sleep and yield to helper.h

[David Hildenbrand]

On 22.06.20 09:42, Janosch Frank wrote:
> They are definitely helper functions.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  pc-bios/s390-ccw/helper.h      | 17 +++++++++++++++++
>  pc-bios/s390-ccw/s390-ccw.h    | 18 ------------------
>  pc-bios/s390-ccw/virtio-net.c  |  1 +
>  pc-bios/s390-ccw/virtio-scsi.c |  1 +
>  4 files changed, 19 insertions(+), 18 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/helper.h b/pc-bios/s390-ccw/helper.h
> index 78d5bc7442..32a453b634 100644
> --- a/pc-bios/s390-ccw/helper.h
> +++ b/pc-bios/s390-ccw/helper.h
> @@ -14,6 +14,7 @@
>  #define S390_CCW_HELPER_H
>  
>  #include "s390-ccw.h"
> +#include "s390-time.h"
>  
>  /* Avoids compiler warnings when casting a pointer to a u32 */
>  static inline uint32_t ptr2u32(void *ptr)
> @@ -28,4 +29,20 @@ static inline void *u32toptr(uint32_t n)
>      return (void *)(uint64_t)n;
>  }
>  
> +static inline void yield(void)
> +{
> +    asm volatile ("diag 0,0,0x44"
> +                  : :
> +                  : "memory", "cc");
> +}
> +
> +static inline void sleep(unsigned int seconds)
> +{
> +    ulong target = get_time_seconds() + seconds;
> +
> +    while (get_time_seconds() < target) {
> +        yield();
> +    }
> +}
> +
>  #endif
> diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
> index fae1de363f..c5820e43ae 100644
> --- a/pc-bios/s390-ccw/s390-ccw.h
> +++ b/pc-bios/s390-ccw/s390-ccw.h
> @@ -142,26 +142,8 @@ static inline void debug_print_addr(const char *desc, void *p)
>  #define KVM_S390_VIRTIO_SET_STATUS      2
>  #define KVM_S390_VIRTIO_CCW_NOTIFY      3
>  
> -static inline void yield(void)
> -{
> -    asm volatile ("diag 0,0,0x44"
> -                  : :
> -                  : "memory", "cc");
> -}
> -
>  #define MAX_SECTOR_SIZE 4096
>  
> -#include "s390-time.h"
> -
> -static inline void sleep(unsigned int seconds)
> -{
> -    ulong target = get_time_seconds() + seconds;
> -
> -    while (get_time_seconds() < target) {
> -        yield();
> -    }
> -}
> -
>  static inline void IPL_assert(bool term, const char *message)
>  {
>      if (!term) {
> diff --git a/pc-bios/s390-ccw/virtio-net.c b/pc-bios/s390-ccw/virtio-net.c
> index a13f3b6fb9..2fcb0a58c5 100644
> --- a/pc-bios/s390-ccw/virtio-net.c
> +++ b/pc-bios/s390-ccw/virtio-net.c
> @@ -20,6 +20,7 @@
>  #include "s390-ccw.h"
>  #include "virtio.h"
>  #include "s390-time.h"
> +#include "helper.h"
>  
>  #ifndef DEBUG_VIRTIO_NET
>  #define DEBUG_VIRTIO_NET 0
> diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c
> index 7bf0be4ffa..eddfb8a7ad 100644
> --- a/pc-bios/s390-ccw/virtio-scsi.c
> +++ b/pc-bios/s390-ccw/virtio-scsi.c
> @@ -15,6 +15,7 @@
>  #include "scsi.h"
>  #include "virtio-scsi.h"
>  #include "s390-time.h"
> +#include "helper.h"
>  
>  static ScsiDevice default_scsi_device;
>  static VirtioScsiCmdReq req;
> 

Reviewed-by: David Hildenbrand <david@redhat.com>

-- 
Thanks,

David / dhildenb

Re: [PATCH v4 5/9] pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant

[Thomas Huth]

On 22/06/2020 09.42, Janosch Frank wrote:
> ZMODE has a lot of ambiguity with the ESAME architecture mode, but is
> actually 64 bit addressing.
> 
> As PSW_MASK_64 is now effectively 33 bit long and the PSWLegacy struct
> has 2 32 bit members, let's also use a unsigned long pointer in
> dasd-ipl.c instead when oring the constant into a 8 byte PSW.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> ---
>  pc-bios/s390-ccw/dasd-ipl.c  | 5 ++---
>  pc-bios/s390-ccw/s390-arch.h | 2 +-
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c
> index 0fc879bb8e..0dbad051a2 100644
> --- a/pc-bios/s390-ccw/dasd-ipl.c
> +++ b/pc-bios/s390-ccw/dasd-ipl.c
> @@ -206,7 +206,7 @@ static void run_ipl2(SubChannelId schid, uint16_t cutype, uint32_t addr)
>   */
>  void dasd_ipl(SubChannelId schid, uint16_t cutype)
>  {
> -    PSWLegacy *pswl = (PSWLegacy *) 0x00;
> +    unsigned long *pswl = 0x0;

... or we could use the "lowcore" pointer from s390-arch.h ... though
that's PSWLegacy again...

>      uint32_t ipl2_addr;
>  
>      /* Construct Read IPL CCW and run it to read IPL1 from boot disk */
> @@ -229,7 +229,6 @@ void dasd_ipl(SubChannelId schid, uint16_t cutype)
>      run_ipl2(schid, cutype, ipl2_addr);
>  
>      /* Transfer control to the guest operating system */
> -    pswl->mask |= PSW_MASK_EAMODE;   /* Force z-mode */

Wait, PSW_MASK_EAMODE was 0x0000000100000000 and ->mask was only a
32-bit value ... how was that ever supposed to work correctly?

> -    pswl->addr |= PSW_MASK_BAMODE;   /* ...          */
> +    *pswl |= PSW_MASK_64;   /* Force 64 bit addressing */

So is this even a bug fix and not only a cosmetic change?

... the whole logic here looks fishy to me ... do we need this PSW
modification at all? Shouldn't the guest decide which mode it wants to
use in its startup code?

 Thomas


>      jump_to_low_kernel();
>  }
> diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
> index 5f36361c02..73852029d4 100644
> --- a/pc-bios/s390-ccw/s390-arch.h
> +++ b/pc-bios/s390-ccw/s390-arch.h
> @@ -29,7 +29,7 @@ _Static_assert(sizeof(struct PSWLegacy) == 8, "PSWLegacy size incorrect");
>  #define PSW_MASK_WAIT       0x0002000000000000ULL
>  #define PSW_MASK_EAMODE     0x0000000100000000ULL
>  #define PSW_MASK_BAMODE     0x0000000080000000ULL
> -#define PSW_MASK_ZMODE      (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
> +#define PSW_MASK_64         (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
>  
>  /* Low core mapping */
>  typedef struct LowCore {
> 

Re: [PATCH v4 7/9] pc-bios: s390x: Move panic() into header and add infinite loop

[Thomas Huth]

On 22/06/2020 09.42, Janosch Frank wrote:
> panic() was defined for the ccw and net bios, i.e. twice, so it's
> cleaner to rather put it into the header.
> 
> Also let's add an infinite loop into the assembly of disabled_wait() so
> the caller doesn't need to take care of it.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> ---
>  pc-bios/s390-ccw/main.c     | 7 -------
>  pc-bios/s390-ccw/netmain.c  | 8 --------
>  pc-bios/s390-ccw/s390-ccw.h | 9 +++++++--
>  pc-bios/s390-ccw/start.S    | 5 +++--
>  4 files changed, 10 insertions(+), 19 deletions(-)
[...]
> diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
> index aa8fceb19d..35be141d8d 100644
> --- a/pc-bios/s390-ccw/start.S
> +++ b/pc-bios/s390-ccw/start.S
> @@ -47,8 +47,9 @@ memsetxc:
>   */
>  	.globl disabled_wait
>  disabled_wait:
> -        larl %r1,disabled_wait_psw
> -        lpswe   0(%r1)
> +        larl	%r1,disabled_wait_psw
> +        lpswe	0(%r1)
> +1:	j	1b

Could you please fix the white spaces here while you're at it (TABs vs.
spaces).

 Thanks,
  Thomas

Re: [PATCH v4 5/9] pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant

[Janosch Frank]

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On 6/22/20 1:40 PM, Thomas Huth wrote:
> On 22/06/2020 09.42, Janosch Frank wrote:
>> ZMODE has a lot of ambiguity with the ESAME architecture mode, but is
>> actually 64 bit addressing.
>>
>> As PSW_MASK_64 is now effectively 33 bit long and the PSWLegacy struct
>> has 2 32 bit members, let's also use a unsigned long pointer in
>> dasd-ipl.c instead when oring the constant into a 8 byte PSW.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
>> Reviewed-by: David Hildenbrand <david@redhat.com>
>> ---
>>  pc-bios/s390-ccw/dasd-ipl.c  | 5 ++---
>>  pc-bios/s390-ccw/s390-arch.h | 2 +-
>>  2 files changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c
>> index 0fc879bb8e..0dbad051a2 100644
>> --- a/pc-bios/s390-ccw/dasd-ipl.c
>> +++ b/pc-bios/s390-ccw/dasd-ipl.c
>> @@ -206,7 +206,7 @@ static void run_ipl2(SubChannelId schid, uint16_t cutype, uint32_t addr)
>>   */
>>  void dasd_ipl(SubChannelId schid, uint16_t cutype)
>>  {
>> -    PSWLegacy *pswl = (PSWLegacy *) 0x00;
>> +    unsigned long *pswl = 0x0;
> 
> ... or we could use the "lowcore" pointer from s390-arch.h ... though
> that's PSWLegacy again...
> 
>>      uint32_t ipl2_addr;
>>  
>>      /* Construct Read IPL CCW and run it to read IPL1 from boot disk */
>> @@ -229,7 +229,6 @@ void dasd_ipl(SubChannelId schid, uint16_t cutype)
>>      run_ipl2(schid, cutype, ipl2_addr);
>>  
>>      /* Transfer control to the guest operating system */
>> -    pswl->mask |= PSW_MASK_EAMODE;   /* Force z-mode */
> 
> Wait, PSW_MASK_EAMODE was 0x0000000100000000 and ->mask was only a
> 32-bit value ... how was that ever supposed to work correctly?
> 
>> -    pswl->addr |= PSW_MASK_BAMODE;   /* ...          */
>> +    *pswl |= PSW_MASK_64;   /* Force 64 bit addressing */
> 
> So is this even a bug fix and not only a cosmetic change?
> 
> ... the whole logic here looks fishy to me ... do we need this PSW
> modification at all? Shouldn't the guest decide which mode it wants to
> use in its startup code?
> 
>  Thomas

Looking at jump_to_low_kernel(), jump_to_IPL_code and jump_to_IPL_2 I
think we can remove this line completely.

jump_to_IPL_code() prepares its own PSW and jumps to jump_to_IPL_2() via
diag308 subcode 1.

jump_to_IPL_2() fetches the saved PSW and does a br to the PSW address
so the mask completely goes to waste anyway.


DASD passthrough is rarely used so nobody looks at that code anymore. I
need to ask Jason about the intention behind those lines.


> 
> 
>>      jump_to_low_kernel();
>>  }
>> diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
>> index 5f36361c02..73852029d4 100644
>> --- a/pc-bios/s390-ccw/s390-arch.h
>> +++ b/pc-bios/s390-ccw/s390-arch.h
>> @@ -29,7 +29,7 @@ _Static_assert(sizeof(struct PSWLegacy) == 8, "PSWLegacy size incorrect");
>>  #define PSW_MASK_WAIT       0x0002000000000000ULL
>>  #define PSW_MASK_EAMODE     0x0000000100000000ULL
>>  #define PSW_MASK_BAMODE     0x0000000080000000ULL
>> -#define PSW_MASK_ZMODE      (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
>> +#define PSW_MASK_64         (PSW_MASK_EAMODE | PSW_MASK_BAMODE)
>>  
>>  /* Low core mapping */
>>  typedef struct LowCore {
>>
> 



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