Merge remote-tracking branch 'remotes/borntraeger/tags/s390x-20200310' into staging

s390x/ipl: Fixes for ipl and bios

- provide a pointer to the loadparm. This fixes crashes in zipl
- do not throw away guest changes of the IPL parameter during reset
- refactor IPLB checks

# gpg: Signature made Tue 10 Mar 2020 14:50:31 GMT
# gpg:                using RSA key 117BBC80B5A61C7C
# gpg: Good signature from "Christian Borntraeger (2nd IBM address) <borntraeger@linux.ibm.com>" [unknown]
# gpg:                 aka "Christian Borntraeger (IBM) <borntraeger@de.ibm.com>" [full]
# gpg:                 aka "Christian Borntraeger (kernel.org email address) <borntraeger@kernel.org>" [unknown]
# Primary key fingerprint: F922 9381 A334 08F9 DBAB  FBCA 117B BC80 B5A6 1C7C

* remotes/borntraeger/tags/s390x-20200310:
  s390x: ipl: Consolidate iplb validity check into one function
  s390/ipl: sync back loadparm
  s390x/bios: rebuild s390-ccw.img
  pc-bios: s390x: Save iplb location in lowcore

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

9 files changed, 53 insertions, 13 deletions

diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index 9c1ecd4..b81942e 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -538,6 +538,30 @@ static bool is_virtio_scsi_device(IplParameterBlock *iplb)
     return is_virtio_ccw_device_of_type(iplb, VIRTIO_ID_SCSI);
 }
 
+static void update_machine_ipl_properties(IplParameterBlock *iplb)
+{
+    Object *machine = qdev_get_machine();
+    Error *err = NULL;
+
+    /* Sync loadparm */
+    if (iplb->flags & DIAG308_FLAGS_LP_VALID) {
+        uint8_t *ebcdic_loadparm = iplb->loadparm;
+        char ascii_loadparm[8];
+        int i;
+
+        for (i = 0; i < 8 && ebcdic_loadparm[i]; i++) {
+            ascii_loadparm[i] = ebcdic2ascii[(uint8_t) ebcdic_loadparm[i]];
+        }
+        ascii_loadparm[i] = 0;
+        object_property_set_str(machine, ascii_loadparm, "loadparm", &err);
+    } else {
+        object_property_set_str(machine, "", "loadparm", &err);
+    }
+    if (err) {
+        warn_report_err(err);
+    }
+}
+
 void s390_ipl_update_diag308(IplParameterBlock *iplb)
 {
     S390IPLState *ipl = get_ipl_device();
@@ -545,6 +569,7 @@ void s390_ipl_update_diag308(IplParameterBlock *iplb)
     ipl->iplb = *iplb;
     ipl->iplb_valid = true;
     ipl->netboot = is_virtio_net_device(iplb);
+    update_machine_ipl_properties(iplb);
 }
 
 IplParameterBlock *s390_ipl_get_iplb(void)
diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h
index d481310..3e44abe 100644
--- a/hw/s390x/ipl.h
+++ b/hw/s390x/ipl.h
@@ -173,16 +173,16 @@ static inline bool iplb_valid_len(IplParameterBlock *iplb)
     return be32_to_cpu(iplb->len) <= sizeof(IplParameterBlock);
 }
 
-static inline bool iplb_valid_ccw(IplParameterBlock *iplb)
+static inline bool iplb_valid(IplParameterBlock *iplb)
 {
-    return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_CCW_LEN &&
-           iplb->pbt == S390_IPL_TYPE_CCW;
-}
-
-static inline bool iplb_valid_fcp(IplParameterBlock *iplb)
-{
-    return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_FCP_LEN &&
-           iplb->pbt == S390_IPL_TYPE_FCP;
+    switch (iplb->pbt) {
+    case S390_IPL_TYPE_FCP:
+        return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_FCP_LEN;
+    case S390_IPL_TYPE_CCW:
+        return be32_to_cpu(iplb->len) >= S390_IPLB_MIN_CCW_LEN;
+    default:
+        return false;
+    }
 }
 
 #endif
diff --git a/pc-bios/s390-ccw.img b/pc-bios/s390-ccw.img
index 91cdee4..b9da9d8 100644
--- a/pc-bios/s390-ccw.img
+++ b/pc-bios/s390-ccw.img
diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c
index da13c43..4eba251 100644
--- a/pc-bios/s390-ccw/jump2ipl.c
+++ b/pc-bios/s390-ccw/jump2ipl.c
@@ -35,6 +35,7 @@ void jump_to_IPL_code(uint64_t address)
 {
     /* store the subsystem information _after_ the bootmap was loaded */
     write_subsystem_identification();
+    write_iplb_location();
 
     /* prevent unknown IPL types in the guest */
     if (iplb.pbt == S390_IPL_TYPE_QEMU_SCSI) {
diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index a21b386..4e65b41 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -9,6 +9,7 @@
  */
 
 #include "libc.h"
+#include "helper.h"
 #include "s390-arch.h"
 #include "s390-ccw.h"
 #include "cio.h"
@@ -22,7 +23,7 @@ QemuIplParameters qipl;
 IplParameterBlock iplb __attribute__((__aligned__(PAGE_SIZE)));
 static bool have_iplb;
 static uint16_t cutype;
-LowCore const *lowcore; /* Yes, this *is* a pointer to address 0 */
+LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */
 
 #define LOADPARM_PROMPT "PROMPT  "
 #define LOADPARM_EMPTY  "        "
@@ -42,6 +43,11 @@ void write_subsystem_identification(void)
     *zeroes = 0;
 }
 
+void write_iplb_location(void)
+{
+    lowcore->ptr_iplb = ptr2u32(&iplb);
+}
+
 void panic(const char *string)
 {
     sclp_print(string);
diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c
index f2dcc01..309ffa3 100644
--- a/pc-bios/s390-ccw/netmain.c
+++ b/pc-bios/s390-ccw/netmain.c
@@ -40,6 +40,7 @@
 #define DEFAULT_TFTP_RETRIES 20
 
 extern char _start[];
+void write_iplb_location(void) {}
 
 #define KERNEL_ADDR             ((void *)0L)
 #define KERNEL_MAX_SIZE         ((long)_start)
diff --git a/pc-bios/s390-ccw/s390-arch.h b/pc-bios/s390-ccw/s390-arch.h
index 504fc7c..5f36361 100644
--- a/pc-bios/s390-ccw/s390-arch.h
+++ b/pc-bios/s390-ccw/s390-arch.h
@@ -36,7 +36,13 @@ typedef struct LowCore {
     /* prefix area: defined by architecture */
     PSWLegacy       ipl_psw;                  /* 0x000 */
     uint32_t        ccw1[2];                  /* 0x008 */
-    uint32_t        ccw2[2];                  /* 0x010 */
+    union {
+        uint32_t        ccw2[2];                  /* 0x010 */
+        struct {
+            uint32_t reserved10;
+            uint32_t ptr_iplb;
+        };
+    };
     uint8_t         pad1[0x80 - 0x18];        /* 0x018 */
     uint32_t        ext_params;               /* 0x080 */
     uint16_t        cpu_addr;                 /* 0x084 */
@@ -85,7 +91,7 @@ typedef struct LowCore {
     PSW             io_new_psw;               /* 0x1f0 */
 } __attribute__((packed, aligned(8192))) LowCore;
 
-extern LowCore const *lowcore;
+extern LowCore *lowcore;
 
 static inline void set_prefix(uint32_t address)
 {
diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h
index 11bce7d..21f27e7 100644
--- a/pc-bios/s390-ccw/s390-ccw.h
+++ b/pc-bios/s390-ccw/s390-ccw.h
@@ -57,6 +57,7 @@ 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)));
 unsigned int get_loadparm_index(void);
 
diff --git a/target/s390x/diag.c b/target/s390x/diag.c
index b5aec06..54e5670 100644
--- a/target/s390x/diag.c
+++ b/target/s390x/diag.c
@@ -117,7 +117,7 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
 
         cpu_physical_memory_read(addr, iplb, be32_to_cpu(iplb->len));
 
-        if (!iplb_valid_ccw(iplb) && !iplb_valid_fcp(iplb)) {
+        if (!iplb_valid(iplb)) {
             env->regs[r1 + 1] = DIAG_308_RC_INVALID;
             goto out;
         }