diff options
| author | Sasha Levin <levinsasha928@gmail.com> | 2011-12-14 08:37:26 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-06-01 16:39:49 +0100 |
| commit | e13377810d2571851908ec190494e0d333107bb6 (patch) | |
| tree | e4f4a727fbc75acad801876b644bca3846bfd561 /ioeventfd.c | |
| parent | 6930e42fa2485dc67cd3a5efc75278de45eec6a9 (diff) | |
| download | kvmtool-e13377810d2571851908ec190494e0d333107bb6.tar.gz | |
kvm tools: Don't use ioeventfds if no KVM_CAP_IOEVENTFD
Check KVM_CAP_IOEVENTFD before using ioeventfds.
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'ioeventfd.c')
| -rw-r--r-- | ioeventfd.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/ioeventfd.c b/ioeventfd.c index 3a240e4f..75dd3f23 100644 --- a/ioeventfd.c +++ b/ioeventfd.c @@ -18,9 +18,14 @@ static struct epoll_event events[IOEVENTFD_MAX_EVENTS]; static int epoll_fd; static LIST_HEAD(used_ioevents); +static bool ioeventfd_avail; -void ioeventfd__init(void) +void ioeventfd__init(struct kvm *kvm) { + ioeventfd_avail = kvm__has_cap(kvm, KVM_CAP_IOEVENTFD); + if (!ioeventfd_avail) + return; + epoll_fd = epoll_create(IOEVENTFD_MAX_EVENTS); if (epoll_fd < 0) die("Failed creating epoll fd"); @@ -33,6 +38,9 @@ void ioeventfd__add_event(struct ioevent *ioevent) struct ioevent *new_ioevent; int event; + if (!ioeventfd_avail) + return; + new_ioevent = malloc(sizeof(*new_ioevent)); if (new_ioevent == NULL) die("Failed allocating memory for new ioevent"); @@ -68,6 +76,9 @@ void ioeventfd__del_event(u64 addr, u64 datamatch) struct ioevent *ioevent; u8 found = 0; + if (!ioeventfd_avail) + return; + list_for_each_entry(ioevent, &used_ioevents, list) { if (ioevent->io_addr == addr) { found = 1; @@ -123,6 +134,9 @@ void ioeventfd__start(void) { pthread_t thread; + if (!ioeventfd_avail) + return; + if (pthread_create(&thread, NULL, ioeventfd__thread, NULL) != 0) die("Failed starting ioeventfd thread"); } |