[PATCH v1 12/14] s390x: introduce s390_get_max_pagesize()

[David Hildenbrand <david@redhat.com>]

Let's add a way to return the value (successfully) set via
s390_set_max_pagesize() previously. This will be helpful to reject
hotplugged memory devices that would exceed this initially set page size.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/cpu-sysemu.c | 16 ++++++++++++++++
 target/s390x/cpu.h        |  1 +
 2 files changed, 17 insertions(+)

diff --git a/target/s390x/cpu-sysemu.c b/target/s390x/cpu-sysemu.c
index 1915567b3a..bee5d6c2ee 100644
--- a/target/s390x/cpu-sysemu.c
+++ b/target/s390x/cpu-sysemu.c
@@ -278,11 +278,27 @@ uint64_t s390_get_memory_limit(void)
     return memory_limit;
 }
 
+static uint64_t max_pagesize;
+
 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 {
+    ERRP_GUARD();
+
+    if (max_pagesize) {
+        error_setg(errp, "Maximum page size can only be set once");
+        return;
+    }
     if (kvm_enabled()) {
         kvm_s390_set_max_pagesize(pagesize, errp);
     }
+    if (!*errp) {
+        max_pagesize = pagesize;
+    }
+}
+
+uint64_t s390_get_max_pagesize(void)
+{
+    return max_pagesize;
 }
 
 void s390_cmma_reset(void)
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 7a51b606ed..37845e0d9d 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -897,6 +897,7 @@ void s390_crypto_reset(void);
 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit);
 uint64_t s390_get_memory_limit(void);
 void s390_set_max_pagesize(uint64_t pagesize, Error **errp);
+uint64_t s390_get_max_pagesize(void);
 void s390_cmma_reset(void);
 void s390_enable_css_support(S390CPU *cpu);
 void s390_do_cpu_set_diag318(CPUState *cs, run_on_cpu_data arg);
-- 
2.46.0