diff options
Diffstat (limited to 'pc-bios/s390-ccw/virtio.c')
| -rw-r--r-- | pc-bios/s390-ccw/virtio.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index ab49840db8..0af901264b 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -17,6 +17,12 @@ #include "helper.h" #include "s390-time.h" +#define membarrier() do { asm volatile("bcr 15,0\n" :: : "memory"); } while (0) + +#define __ASM_BARRIER "bcr 15,0\n" + + + #define VRING_WAIT_REPLY_TIMEOUT 30 static VRing block[VIRTIO_MAX_VQS]; @@ -154,12 +160,15 @@ void vring_send_buf(VRing *vr, void *p, int len, int flags) /* Chains only have a single ID */ if (!(flags & VRING_DESC_F_NEXT)) { + membarrier(); vr->avail->idx++; + membarrier(); } } int vr_poll(VRing *vr) { + membarrier(); if (vr->used->idx == vr->used_idx) { vring_notify(vr); yield(); @@ -169,7 +178,9 @@ int vr_poll(VRing *vr) vr->used_idx = vr->used->idx; vr->next_idx = 0; vr->desc[0].len = 0; + membarrier(); vr->desc[0].flags = 0; + membarrier(); return 1; /* vr has been updated */ } |