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vhost+postcopy: Resolve client address

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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 <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-03-12 17:21:13 +00:00 • committed by Michael S. Tsirkin
parent c188c53927
commit 375318d03f
2 changed files with 33 additions and 1 deletions
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31
hw/virtio/vhost-user.c
View file

@ -26,6 +26,7 @@
#include <sys/socket.h>
#include <sys/un.h>
#include <linux/vhost.h>
#include <linux/userfaultfd.h>
#define VHOST_MEMORY_MAX_NREGIONS 8
#define VHOST_USER_F_PROTOCOL_FEATURES 30
@ -974,7 +975,35 @@ out:
static int vhost_user_postcopy_fault_handler(struct PostCopyFD *pcfd,
void *ufd)
{
return 0;
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;
trace_vhost_user_postcopy_fault_handler(pcfd->idstr, faultaddr,
dev->mem->nregions);
for (i = 0; i < MIN(dev->mem->nregions, u->region_rb_len); 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;
}
/*