diff options
Diffstat (limited to 'hw/s390x/pv.c')
| -rw-r--r-- | hw/s390x/pv.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/hw/s390x/pv.c b/hw/s390x/pv.c index 49ea382..b63f378 100644 --- a/hw/s390x/pv.c +++ b/hw/s390x/pv.c @@ -13,6 +13,7 @@ #include <linux/kvm.h> +#include "qemu/units.h" #include "qapi/error.h" #include "qemu/error-report.h" #include "sysemu/kvm.h" @@ -115,7 +116,7 @@ static void *s390_pv_do_unprot_async_fn(void *p) return NULL; } -bool s390_pv_vm_try_disable_async(void) +bool s390_pv_vm_try_disable_async(S390CcwMachineState *ms) { /* * t is only needed to create the thread; once qemu_thread_create @@ -123,7 +124,12 @@ bool s390_pv_vm_try_disable_async(void) */ QemuThread t; - if (!kvm_check_extension(kvm_state, KVM_CAP_S390_PROTECTED_ASYNC_DISABLE)) { + /* + * 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)->maxram_size <= 2 * GiB) || + !kvm_check_extension(kvm_state, KVM_CAP_S390_PROTECTED_ASYNC_DISABLE)) { return false; } if (s390_pv_cmd(KVM_PV_ASYNC_CLEANUP_PREPARE, NULL) != 0) { |