From 03f47ee49e1478b5ffffb3a9b6203c672903196c Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Mon, 29 May 2017 14:19:02 +0200 Subject: [PATCH] s390x/kvm: Rework cmma management Let's keep track of cmma enablement and move the mem_path check into the actual enablement. This now also warns users that do not use cpu-models about disabled cmma when using huge pages. Signed-off-by: Janosch Frank Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- target/s390x/cpu.h | 1 + target/s390x/kvm.c | 26 +++++++++++++++++--------- 2 files changed, 18 insertions(+), 9 deletions(-) diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index bdb9bdbc9d..8ab75c0d43 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -1158,6 +1158,7 @@ int kvm_s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch, int vq, bool assign); int kvm_s390_cpu_restart(S390CPU *cpu); int kvm_s390_get_memslot_count(KVMState *s); +int kvm_s390_cmma_active(void); void kvm_s390_cmma_reset(void); int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t cpu_state); void kvm_s390_reset_vcpu(S390CPU *cpu); diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index a3d00196f4..7a2a7c0895 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -140,6 +140,8 @@ static int cap_mem_op; static int cap_s390_irq; static int cap_ri; +static int active_cmma; + static void *legacy_s390_alloc(size_t size, uint64_t *align); static int kvm_s390_query_mem_limit(KVMState *s, uint64_t *memory_limit) @@ -177,6 +179,11 @@ int kvm_s390_set_mem_limit(KVMState *s, uint64_t new_limit, uint64_t *hw_limit) return kvm_vm_ioctl(s, KVM_SET_DEVICE_ATTR, &attr); } +int kvm_s390_cmma_active(void) +{ + return active_cmma; +} + static bool kvm_s390_cmma_available(void) { static bool initialized, value; @@ -197,7 +204,7 @@ void kvm_s390_cmma_reset(void) .attr = KVM_S390_VM_MEM_CLR_CMMA, }; - if (mem_path || !kvm_s390_cmma_available()) { + if (!kvm_s390_cmma_active()) { return; } @@ -213,7 +220,13 @@ static void kvm_s390_enable_cmma(void) .attr = KVM_S390_VM_MEM_ENABLE_CMMA, }; + if (mem_path) { + error_report("Warning: CMM will not be enabled because it is not " + "compatible to hugetlbfs."); + return; + } rc = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr); + active_cmma = !rc; trace_kvm_enable_cmma(rc); } @@ -2641,7 +2654,7 @@ void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp) if (!model) { /* compatibility handling if cpu models are disabled */ - if (kvm_s390_cmma_available() && !mem_path) { + if (kvm_s390_cmma_available()) { kvm_s390_enable_cmma(); } return; @@ -2672,13 +2685,8 @@ void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp) error_setg(errp, "KVM: Error configuring CPU subfunctions: %d", rc); return; } - /* enable CMM via CMMA - disable on hugetlbfs */ + /* enable CMM via CMMA */ if (test_bit(S390_FEAT_CMM, model->features)) { - if (mem_path) { - error_report("Warning: CMM will not be enabled because it is not " - "compatible to hugetlbfs."); - } else { - kvm_s390_enable_cmma(); - } + kvm_s390_enable_cmma(); } } -- GitLab