[PATCH 4/4] target/s390x/arch_dump: Add arch cleanup function for PV dumps

[Janosch Frank]

PV dumps block vcpu runs until dump end is reached. If there's an
error between PV dump init and PV dump end the vm will never be able
to run again. One example of such an error is insufficient disk space
for the dump file.

Let's add a cleanup function that tries to do a dump end. The dump
completion data is discarded but there's no point in writing it to a
file anyway if there's a possibility that other PV dump data is
missing.

Signed-off-by: Janosch Frank <fran...@linux.ibm.com>
---
 target/s390x/arch_dump.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/target/s390x/arch_dump.c b/target/s390x/arch_dump.c
index bdb0bfa0e7..70146d7e84 100644
--- a/target/s390x/arch_dump.c
+++ b/target/s390x/arch_dump.c
@@ -433,6 +433,22 @@ static int arch_sections_write(DumpState *s, uint8_t *buff)
     return 0;
 }
 
+static void arch_cleanup(DumpState *s)
+{
+    uint8_t *buff = g_malloc(kvm_s390_pv_dmp_get_size_completion_data());
+    int rc;
+
+    if (!pv_dump_initialized || !buff) {
+        return;
+    }
+
+    rc = kvm_s390_dump_completion_data(buff);
+    if (!rc) {
+            pv_dump_initialized = false;
+    }
+    g_free(buff);
+}
+
 int cpu_get_dump_info(ArchDumpInfo *info,
                       const struct GuestPhysBlockList *guest_phys_blocks)
 {
@@ -448,6 +464,7 @@ int cpu_get_dump_info(ArchDumpInfo *info,
         info->arch_sections_add_fn = *arch_sections_add;
         info->arch_sections_write_hdr_fn = *arch_sections_write_hdr;
         info->arch_sections_write_fn = *arch_sections_write;
+        info->arch_cleanup_fn = *arch_cleanup;
     }
     return 0;
 }
-- 
2.34.1