[v3,11/14] s390x/pv: prepare for memory devices

Commit Message

David Hildenbrand Dec. 19, 2024, 2:41 p.m. UTC

Let's avoid checking for the maxram_size, and instead rely on the memory
limit determined in s390_memory_init(), that might be larger than
maxram_size, for example due to alignment purposes.

This check now correctly mimics what the kernel will check in
kvm_s390_pv_set_aside(), whereby a VM <= 2 GiB VM would end up using
a segment type ASCE.

Message-ID: <[e-mail]>
Acked-by: Michael S. Tsirkin <[e-mail]>
Reviewed-by: Nina Schoetterl-Glausch <[e-mail]>
Signed-off-by: David Hildenbrand <[e-mail]>
---
 target/s390x/kvm/pv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/target/s390x/kvm/pv.c b/target/s390x/kvm/pv.c
index 424cce75ca..fa66607e7b 100644
--- a/target/s390x/kvm/pv.c
+++ b/target/s390x/kvm/pv.c
@@ -133,7 +133,7 @@  bool s390_pv_vm_try_disable_async(S390CcwMachineState *ms)
      * If the feature is not present or if the VM is not larger than 2 GiB,
      * KVM_PV_ASYNC_CLEANUP_PREPARE fill fail; no point in attempting it.
      */
-    if ((MACHINE(ms)->ram_size <= 2 * GiB) ||
+    if (s390_get_memory_limit(ms) <= 2 * GiB ||
         !kvm_check_extension(kvm_state, KVM_CAP_S390_PROTECTED_ASYNC_DISABLE)) {
         return false;
     }