[PATCH v8 11/16] add kvm__check_vm_capability
From: andre.przywara@arm.com (Andre Przywara)
Date: 2016-11-04 17:31:58
Also in:
kvm, kvmarm
Subsystem:
the rest · Maintainer:
Linus Torvalds
KVM capabilities can be per-VM, in this case the ioctl should be issued on the VM file descriptor, not on the system fd. Since this feature is guarded by a (system) capability itself, wrap the call into a function of its own. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- include/kvm/kvm.h | 1 + kvm.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+)
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index 4a76ec2..a76a25d 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h@@ -129,6 +129,7 @@ static inline bool host_ptr_in_ram(struct kvm *kvm, void *p) } bool kvm__supports_extension(struct kvm *kvm, unsigned int extension); +bool kvm__supports_vm_extension(struct kvm *kvm, unsigned int extension); static inline void kvm__set_thread_name(const char *name) {
diff --git a/kvm.c b/kvm.c
index 7fa76f7..665ed14 100644
--- a/kvm.c
+++ b/kvm.c@@ -93,6 +93,34 @@ const char *kvm__get_dir(void) return kvm_dir; } +bool kvm__supports_vm_extension(struct kvm *kvm, unsigned int extension) +{ + static int supports_vm_ext_check = 0; + int ret; + + switch (supports_vm_ext_check) { + case 0: + ret = ioctl(kvm->sys_fd, KVM_CHECK_EXTENSION, + KVM_CAP_CHECK_EXTENSION_VM); + if (ret <= 0) { + supports_vm_ext_check = -1; + return false; + } + supports_vm_ext_check = 1; + /* fall through */ + case 1: + break; + case -1: + return false; + } + + ret = ioctl(kvm->vm_fd, KVM_CHECK_EXTENSION, extension); + if (ret < 0) + return false; + + return ret; +} + bool kvm__supports_extension(struct kvm *kvm, unsigned int extension) { int ret;
--
2.9.0