[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] [PATCH v2 2/2] s390x: Enable KVM huge page backing support

From: Janosch Frank
Subject: [Qemu-devel] [PATCH v2 2/2] s390x: Enable KVM huge page backing support
Date: Tue, 31 Jul 2018 10:09:00 +0100

QEMU has had huge page support for a longer time already, but KVM
memory management under s390x needed some changes to work with huge

Now that we have support, let's enable it if requested and
available. Otherwise we now properly tell the user if there is no
support and back out instead of failing to run the VM later on.

Signed-off-by: Janosch Frank <address@hidden>
 target/s390x/kvm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index d923cf4240..26e6937498 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -285,6 +285,12 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
     MachineClass *mc = MACHINE_GET_CLASS(ms);
+    if (mem_path && kvm_vm_enable_cap(s, KVM_CAP_S390_HPAGE, 0)) {
+        error_report("Huge page backing was specified, "
+                     "but this KVM does not support huge pages");
+        return -EINVAL;
+    }
     mc->default_cpu_type = S390_CPU_TYPE_NAME("host");
     cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
     cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);

reply via email to

[Prev in Thread] Current Thread [Next in Thread]