[v2,12/14] s390x: remember the maximum page size

Commit Message

David Hildenbrand Oct. 8, 2024, 10:54 a.m. UTC

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

Handle it just like how we handle s390_get_memory_limit(), storing it in
the machine, and moving the handling to machine code.

Acked-by: Michael S. Tsirkin <[e-mail]>
Signed-off-by: David Hildenbrand <[e-mail]>
---
 hw/s390x/s390-virtio-ccw.c         | 12 +++++++++++-
 include/hw/s390x/s390-virtio-ccw.h |  1 +
 target/s390x/cpu-sysemu.c          |  7 -------
 target/s390x/cpu.h                 |  1 -
 4 files changed, 12 insertions(+), 9 deletions(-)

Patch

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 2031c4cf29..65f266a78f 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -150,6 +150,16 @@  uint64_t s390_get_memory_limit(S390CcwMachineState *s390ms)
     return s390ms->memory_limit;
 }
 
+static void s390_set_max_pagesize(S390CcwMachineState *s390ms,
+                                  uint64_t pagesize)
+{
+    assert(!s390ms->max_pagesize && pagesize);
+    if (kvm_enabled()) {
+        kvm_s390_set_max_pagesize(pagesize, &error_fatal);
+    }
+    s390ms->max_pagesize = pagesize;
+}
+
 static void s390_memory_init(MachineState *machine)
 {
     S390CcwMachineState *s390ms = S390_CCW_MACHINE(machine);
@@ -198,7 +208,7 @@  static void s390_memory_init(MachineState *machine)
      * Configure the maximum page size. As no memory devices were created
      * yet, this is the page size of initial memory only.
      */
-    s390_set_max_pagesize(qemu_maxrampagesize(), &error_fatal);
+    s390_set_max_pagesize(s390ms, qemu_maxrampagesize());
     /* Initialize storage key device */
     s390_skeys_init();
     /* Initialize storage attributes device */
diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h
index eb04542979..5a730f5d07 100644
--- a/include/hw/s390x/s390-virtio-ccw.h
+++ b/include/hw/s390x/s390-virtio-ccw.h
@@ -30,6 +30,7 @@  struct S390CcwMachineState {
     bool pv;
     uint8_t loadparm[8];
     uint64_t memory_limit;
+    uint64_t max_pagesize;
 
     SCLPDevice *sclp;
 };
diff --git a/target/s390x/cpu-sysemu.c b/target/s390x/cpu-sysemu.c
index 3118a25fee..706a5c53e2 100644
--- a/target/s390x/cpu-sysemu.c
+++ b/target/s390x/cpu-sysemu.c
@@ -255,13 +255,6 @@  unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
     return s390_count_running_cpus();
 }
 
-void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
-{
-    if (kvm_enabled()) {
-        kvm_s390_set_max_pagesize(pagesize, errp);
-    }
-}
-
 void s390_cmma_reset(void)
 {
     if (kvm_enabled()) {
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index b4506539f0..5b7992deda 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -881,7 +881,6 @@  static inline void s390_do_cpu_load_normal(CPUState *cs, run_on_cpu_data arg)
 
 /* cpu.c */
 void s390_crypto_reset(void);
-void s390_set_max_pagesize(uint64_t pagesize, Error **errp);
 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);