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[Qemu-devel] [RFC v2 21/32] postcopy: postcopy_notify_shared_wake
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [RFC v2 21/32] postcopy: postcopy_notify_shared_wake |
Date: |
Thu, 24 Aug 2017 20:27:19 +0100 |
From: "Dr. David Alan Gilbert" <address@hidden>
Add a hook to allow a client userfaultfd to be 'woken'
when a page arrives, and a walker that calls that
hook for relevant clients given a RAMBlock and offset.
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
---
migration/postcopy-ram.c | 16 ++++++++++++++++
migration/postcopy-ram.h | 10 ++++++++++
2 files changed, 26 insertions(+)
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 2c9680ef7a..40b58a7912 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -749,6 +749,22 @@ static int qemu_ufd_copy_ioctl(int userfault_fd, void
*host_addr,
return ret;
}
+int postcopy_notify_shared_wake(RAMBlock *rb, uint64_t offset)
+{
+ int i;
+ MigrationIncomingState *mis = migration_incoming_get_current();
+ GArray *pcrfds = mis->postcopy_remote_fds;
+
+ for (i = 0; i < pcrfds->len; i++) {
+ struct PostCopyFD *cur = &g_array_index(pcrfds, struct PostCopyFD, i);
+ int ret = cur->waker(cur, rb, offset);
+ if (ret) {
+ return ret;
+ }
+ }
+ return 0;
+}
+
/*
* Place a host page (from) at (host) atomically
* returns 0 on success
diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h
index d2b2f5f4aa..ecf731c689 100644
--- a/migration/postcopy-ram.h
+++ b/migration/postcopy-ram.h
@@ -146,6 +146,10 @@ struct PostCopyFD;
/* ufd is a pointer to the struct uffd_msg *TODO: more Portable! */
typedef int (*pcfdhandler)(struct PostCopyFD *pcfd, void *ufd);
+/* Notification to wake, either on place or on reception of
+ * a fault on something that's already arrived (race)
+ */
+typedef int (*pcfdwake)(struct PostCopyFD *pcfd, RAMBlock *rb, uint64_t
offset);
struct PostCopyFD {
int fd;
@@ -153,6 +157,8 @@ struct PostCopyFD {
void *data;
/* Handler to be called whenever we get a poll event */
pcfdhandler handler;
+ /* Notification to wake shared client */
+ pcfdwake waker;
/* A string to use in error messages */
const char *idstr;
};
@@ -162,6 +168,10 @@ struct PostCopyFD {
*/
void postcopy_register_shared_ufd(struct PostCopyFD *pcfd);
void postcopy_unregister_shared_ufd(struct PostCopyFD *pcfd);
+/* Call each of the shared 'waker's registerd telling them of
+ * availability of a block.
+ */
+int postcopy_notify_shared_wake(RAMBlock *rb, uint64_t offset);
/* Notify a client ufd that a page is available
* Note: The 'client_address' is in the address space of the client
* program not QEMU
--
2.13.5
- [Qemu-devel] [RFC v2 15/32] vhost+postcopy: Register new regions with the ufd, (continued)
- [Qemu-devel] [RFC v2 15/32] vhost+postcopy: Register new regions with the ufd, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 16/32] vhost+postcopy: Send address back to qemu, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 17/32] vhost+postcopy: Stash RAMBlock and offset, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 18/32] vhost+postcopy: Send requests to source for shared pages, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 19/32] vhost+postcopy: Resolve client address, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 20/32] postcopy: wake shared, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 21/32] postcopy: postcopy_notify_shared_wake,
Dr. David Alan Gilbert (git) <=
- [Qemu-devel] [RFC v2 22/32] vhost+postcopy: Add vhost waker, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 23/32] vhost+postcopy: Call wakeups, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 24/32] vub+postcopy: madvises, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 25/32] vhost+postcopy: Lock around set_mem_table, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 26/32] vhost: Add VHOST_USER_POSTCOPY_END message, Dr. David Alan Gilbert (git), 2017/08/24
- [Qemu-devel] [RFC v2 27/32] vhost+postcopy: Wire up POSTCOPY_END notify, Dr. David Alan Gilbert (git), 2017/08/24