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[Qemu-devel] [PULL v2 38/50] vhost+postcopy: Helper to send requests to
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v2 38/50] vhost+postcopy: Helper to send requests to source for shared pages |
Date: |
Tue, 20 Mar 2018 05:17:54 +0200 |
From: "Dr. David Alan Gilbert" <address@hidden>
Provide a helper to be used by shared waker functions to request
shared pages from the source.
The last_rb pointer is moved into the incoming state since this
helper can update it as well as the main fault thread function.
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Marc-André Lureau <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
migration/migration.h | 2 ++
migration/postcopy-ram.h | 3 +++
migration/postcopy-ram.c | 32 +++++++++++++++++++++++++++++---
migration/trace-events | 2 ++
4 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/migration/migration.h b/migration/migration.h
index d02a759..83dc36b 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -49,6 +49,8 @@ struct MigrationIncomingState {
int userfault_event_fd;
QEMUFile *to_src_file;
QemuMutex rp_mutex; /* We send replies from multiple threads */
+ /* RAMBlock of last request sent to source */
+ RAMBlock *last_rb;
void *postcopy_tmp_page;
void *postcopy_tmp_zero_page;
/* PostCopyFD's for external userfaultfds & handlers of shared memory */
diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h
index c8ced34..d7afab0 100644
--- a/migration/postcopy-ram.h
+++ b/migration/postcopy-ram.h
@@ -164,5 +164,8 @@ struct PostCopyFD {
*/
void postcopy_register_shared_ufd(struct PostCopyFD *pcfd);
void postcopy_unregister_shared_ufd(struct PostCopyFD *pcfd);
+/* Callback from shared fault handlers to ask for a page */
+int postcopy_request_shared_page(struct PostCopyFD *pcfd, RAMBlock *rb,
+ uint64_t client_addr, uint64_t offset);
#endif
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 6ce1577..146bc09 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -526,6 +526,32 @@ static int ram_block_enable_notify(const char *block_name,
void *host_addr,
}
/*
+ * Callback from shared fault handlers to ask for a page,
+ * the page must be specified by a RAMBlock and an offset in that rb
+ * Note: Only for use by shared fault handlers (in fault thread)
+ */
+int postcopy_request_shared_page(struct PostCopyFD *pcfd, RAMBlock *rb,
+ uint64_t client_addr, uint64_t rb_offset)
+{
+ size_t pagesize = qemu_ram_pagesize(rb);
+ uint64_t aligned_rbo = rb_offset & ~(pagesize - 1);
+ MigrationIncomingState *mis = migration_incoming_get_current();
+
+ trace_postcopy_request_shared_page(pcfd->idstr, qemu_ram_get_idstr(rb),
+ rb_offset);
+ /* TODO: Check bitmap to see if we already have the page */
+ if (rb != mis->last_rb) {
+ mis->last_rb = rb;
+ migrate_send_rp_req_pages(mis, qemu_ram_get_idstr(rb),
+ aligned_rbo, pagesize);
+ } else {
+ /* Save some space */
+ migrate_send_rp_req_pages(mis, NULL, aligned_rbo, pagesize);
+ }
+ return 0;
+}
+
+/*
* Handle faults detected by the USERFAULT markings
*/
static void *postcopy_ram_fault_thread(void *opaque)
@@ -535,9 +561,9 @@ static void *postcopy_ram_fault_thread(void *opaque)
int ret;
size_t index;
RAMBlock *rb = NULL;
- RAMBlock *last_rb = NULL; /* last RAMBlock we sent part of */
trace_postcopy_ram_fault_thread_entry();
+ mis->last_rb = NULL; /* last RAMBlock we sent part of */
qemu_sem_post(&mis->fault_thread_sem);
struct pollfd *pfd;
@@ -636,8 +662,8 @@ static void *postcopy_ram_fault_thread(void *opaque)
* Send the request to the source - we want to request one
* of our host page sizes (which is >= TPS)
*/
- if (rb != last_rb) {
- last_rb = rb;
+ if (rb != mis->last_rb) {
+ mis->last_rb = rb;
migrate_send_rp_req_pages(mis, qemu_ram_get_idstr(rb),
rb_offset, qemu_ram_pagesize(rb));
} else {
diff --git a/migration/trace-events b/migration/trace-events
index 1e617ad..7c910b5 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -198,6 +198,8 @@ postcopy_ram_incoming_cleanup_closeuf(void) ""
postcopy_ram_incoming_cleanup_entry(void) ""
postcopy_ram_incoming_cleanup_exit(void) ""
postcopy_ram_incoming_cleanup_join(void) ""
+postcopy_request_shared_page(const char *sharer, const char *rb, uint64_t
rb_offset) "for %s in %s offset 0x%"PRIx64
+
save_xbzrle_page_skipping(void) ""
save_xbzrle_page_overflow(void) ""
ram_save_iterate_big_wait(uint64_t milliconds, int iterations) "big wait: %"
PRIu64 " milliseconds, %d iterations"
--
MST
- [Qemu-devel] [PULL v2 25/50] postcopy: Add notifier chain, (continued)
- [Qemu-devel] [PULL v2 25/50] postcopy: Add notifier chain, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 27/50] vhost-user: Add 'VHOST_USER_POSTCOPY_ADVISE' message, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 28/50] libvhost-user: Support sending fds back to qemu, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 29/50] libvhost-user: Open userfaultfd, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 31/50] vhost+postcopy: Register shared ufd with postcopy, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 32/50] vhost+postcopy: Transmit 'listen' to slave, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 33/50] postcopy+vhost-user: Split set_mem_table for postcopy, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 34/50] migration/ram: ramblock_recv_bitmap_test_byte_offset, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 37/50] vhost+postcopy: Stash RAMBlock and offset, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 36/50] vhost+postcopy: Send address back to qemu, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 38/50] vhost+postcopy: Helper to send requests to source for shared pages,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v2 39/50] vhost+postcopy: Resolve client address, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 30/50] postcopy: Allow registering of fd handler, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 40/50] postcopy: helper for waking shared, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 46/50] vhost+postcopy: Wire up POSTCOPY_END notify, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 43/50] vhost+postcopy: Call wakeups, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 44/50] libvhost-user: mprotect & madvises for postcopy, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 35/50] libvhost-user+postcopy: Register new regions with the ufd, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 48/50] postcopy: Allow shared memory, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 42/50] vhost+postcopy: Add vhost waker, Michael S. Tsirkin, 2018/03/19
- [Qemu-devel] [PULL v2 45/50] vhost-user: Add VHOST_USER_POSTCOPY_END message, Michael S. Tsirkin, 2018/03/19