From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> Resolve fault addresses read off the clients UFD into RAMBlock and offset, and call back to the postcopy code to ask for the page.
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com> --- hw/virtio/trace-events | 3 +++ hw/virtio/vhost-user.c | 28 +++++++++++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-) diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 1fd194363a..3cec81bb1e 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -1,6 +1,9 @@ # See docs/tracing.txt for syntax documentation. # hw/virtio/vhost-user.c +vhost_user_postcopy_fault_handler(const char *name, uint64_t fault_address, int nregions) "%s: @%"PRIx64" nregions:%d" +vhost_user_postcopy_fault_handler_loop(int i, uint64_t client_base, uint64_t size) "%d: client%"PRIx64" +%"PRIx64 +vhost_user_postcopy_fault_handler_found(int i, uint64_t region_offset, uint64_t rb_offset) "%d: region_offset: %"PRIx64" rb_offset:%"PRIx64 vhost_user_postcopy_listen(void) "" vhost_user_set_mem_table_postcopy(uint64_t client_addr, uint64_t qhva, int reply_i, int region_i) "client:%"PRIx64" for hva: %"PRIx64" reply %d region %d" vhost_user_set_mem_table_withfd(int index, const char *name, uint64_t memory_size, uint64_t guest_phys_addr, uint64_t userspace_addr, uint64_t offset) "%d:%s: size:%"PRIx64" GPA:%"PRIx64" QVA/userspace:%"PRIx64" RB offset:%"PRIx64 diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 3185af7a45..92620830e4 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -782,9 +782,35 @@ out: static int vhost_user_postcopy_fault_handler(struct PostCopyFD *pcfd, void *ufd) { + struct vhost_dev *dev = pcfd->data; + struct vhost_user *u = dev->opaque; struct uffd_msg *msg = ufd; + uint64_t faultaddr = msg->arg.pagefault.address; + RAMBlock *rb = NULL; + uint64_t rb_offset; + int i; - return 0; + trace_vhost_user_postcopy_fault_handler(pcfd->idstr, faultaddr, + dev->mem->nregions); + for (i = 0; i < dev->mem->nregions; i++) { + trace_vhost_user_postcopy_fault_handler_loop(i, + u->postcopy_client_bases[i], dev->mem->regions[i].memory_size); + if (faultaddr >= u->postcopy_client_bases[i]) { + /* Ofset of the fault address in the vhost region */ + uint64_t region_offset = faultaddr - u->postcopy_client_bases[i]; + if (region_offset <= dev->mem->regions[i].memory_size) { + rb_offset = region_offset + u->region_rb_offset[i]; + trace_vhost_user_postcopy_fault_handler_found(i, + region_offset, rb_offset); + rb = u->region_rb[i]; + return postcopy_request_shared_page(pcfd, rb, faultaddr, + rb_offset); + } + } + } + error_report("%s: Failed to find region for fault %" PRIx64, + __func__, faultaddr); + return -1; } /* -- 2.13.0