diff options
Diffstat (limited to 'kvm-all.c')
| -rw-r--r-- | kvm-all.c | 39 |
1 files changed, 22 insertions, 17 deletions
@@ -280,6 +280,18 @@ int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) return ret; } +int kvm_check_extension(KVMState *s, unsigned int extension) +{ + int ret; + + ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); + if (ret < 0) { + ret = 0; + } + + return ret; +} + int kvm_init(int smp_cpus) { KVMState *s; @@ -327,10 +339,8 @@ int kvm_init(int smp_cpus) * just use a user allocated buffer so we can use phys_ram_base * unmodified. Make sure we have a sufficiently modern version of KVM. */ - ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY); - if (ret <= 0) { - if (ret == 0) - ret = -EINVAL; + if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { + ret = -EINVAL; fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n"); goto err; } @@ -338,11 +348,8 @@ int kvm_init(int smp_cpus) /* There was a nasty bug in < kvm-80 that prevents memory slots from being * destroyed properly. Since we rely on this capability, refuse to work * with any kernel without this capability. */ - ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, - KVM_CAP_DESTROY_MEMORY_REGION_WORKS); - if (ret <= 0) { - if (ret == 0) - ret = -EINVAL; + if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { + ret = -EINVAL; fprintf(stderr, "KVM kernel module broken (DESTROY_MEMORY_REGION)\n" @@ -350,11 +357,10 @@ int kvm_init(int smp_cpus) goto err; } - s->coalesced_mmio = 0; #ifdef KVM_CAP_COALESCED_MMIO - ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO); - if (ret > 0) - s->coalesced_mmio = ret; + s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); +#else + s->coalesced_mmio = 0; #endif ret = kvm_arch_init(s, smp_cpus); @@ -652,11 +658,10 @@ int kvm_has_sync_mmu(void) #ifdef KVM_CAP_SYNC_MMU KVMState *s = kvm_state; - if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0) - return 1; -#endif - + return kvm_check_extension(s, KVM_CAP_SYNC_MMU); +#else return 0; +#endif } void kvm_setup_guest_memory(void *start, size_t size) |