[PATCH v4 1/4] migration: Pass incoming state into qemu_ufd_copy_ioctl()

[Peter Xu <peterx@redhat.com>]

It'll be used in follow up patches to access more fields out of it.  Meanwhile
fetch the userfaultfd inside the function.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 migration/postcopy-ram.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 0a2f88a87d..722034dc01 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -1128,10 +1128,12 @@ int postcopy_ram_incoming_setup(MigrationIncomingState *mis)
     return 0;
 }
 
-static int qemu_ufd_copy_ioctl(int userfault_fd, void *host_addr,
+static int qemu_ufd_copy_ioctl(MigrationIncomingState *mis, void *host_addr,
                                void *from_addr, uint64_t pagesize, RAMBlock *rb)
 {
+    int userfault_fd = mis->userfault_fd;
     int ret;
+
     if (from_addr) {
         struct uffdio_copy copy_struct;
         copy_struct.dst = (uint64_t)(uintptr_t)host_addr;
@@ -1185,7 +1187,7 @@ int postcopy_place_page(MigrationIncomingState *mis, void *host, void *from,
      * which would be slightly cheaper, but we'd have to be careful
      * of the order of updating our page state.
      */
-    if (qemu_ufd_copy_ioctl(mis->userfault_fd, host, from, pagesize, rb)) {
+    if (qemu_ufd_copy_ioctl(mis, host, from, pagesize, rb)) {
         int e = errno;
         error_report("%s: %s copy host: %p from: %p (size: %zd)",
                      __func__, strerror(e), host, from, pagesize);
@@ -1212,7 +1214,7 @@ int postcopy_place_page_zero(MigrationIncomingState *mis, void *host,
      * but it's not available for everything (e.g. hugetlbpages)
      */
     if (qemu_ram_is_uf_zeroable(rb)) {
-        if (qemu_ufd_copy_ioctl(mis->userfault_fd, host, NULL, pagesize, rb)) {
+        if (qemu_ufd_copy_ioctl(mis, host, NULL, pagesize, rb)) {
             int e = errno;
             error_report("%s: %s zero host: %p",
                          __func__, strerror(e), host);
-- 
2.26.2