[PATCH v4 06/28] s390x/diag: Refactor address validation check from diag308_parm_check

[Zhuoying Cai <zycai@linux.ibm.com>]

Create a function to validate the address parameter of DIAGNOSE.

Refactor the function for reuse in the next patch, which allows address
validation in read or write operation of DIAGNOSE.

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
---
 hw/s390x/ipl.h      | 6 ++++++
 target/s390x/diag.c | 4 +---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h
index bee72dfbb3..e26fc1cd6a 100644
--- a/hw/s390x/ipl.h
+++ b/hw/s390x/ipl.h
@@ -118,6 +118,12 @@ QEMU_BUILD_BUG_MSG(offsetof(S390IPLState, iplb) & 3, "alignment of iplb wrong");
 #define S390_IPLB_MIN_FCP_LEN 384
 #define S390_IPLB_MIN_QEMU_SCSI_LEN 200
 
+static inline bool diag_parm_addr_valid(uint64_t addr, size_t size, bool write)
+{
+    return address_space_access_valid(&address_space_memory, addr,
+                                      size, write, MEMTXATTRS_UNSPECIFIED);
+}
+
 static inline bool iplb_valid_len(IplParameterBlock *iplb)
 {
     return be32_to_cpu(iplb->len) <= sizeof(IplParameterBlock);
diff --git a/target/s390x/diag.c b/target/s390x/diag.c
index d33c5daf38..7b9b47a171 100644
--- a/target/s390x/diag.c
+++ b/target/s390x/diag.c
@@ -65,9 +65,7 @@ static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return -1;
     }
-    if (!address_space_access_valid(&address_space_memory, addr,
-                                    sizeof(IplParameterBlock), write,
-                                    MEMTXATTRS_UNSPECIFIED)) {
+    if (!diag_parm_addr_valid(addr, sizeof(IplParameterBlock), write)) {
         s390_program_interrupt(env, PGM_ADDRESSING, ra);
         return -1;
     }
-- 
2.49.0