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authorWei Yang <richardw.yang@linux.intel.com>2019-10-05 21:50:20 +0800
committerDr. David Alan Gilbert <dgilbert@redhat.com>2019-10-11 14:28:19 +0100
commit3414322a83be11b86166d2a53432615092bdcbb8 (patch)
treed6e30a47e93afa8f4e3516bbd81cc05e5df6edc4
parentfb14a42ade228e2d6123af56c0015262fd83250d (diff)
migration/postcopy: allocate tmp_page in setup stage
During migration, a tmp page is allocated so that we could place a whole host page during postcopy. Currently the page is allocated during load stage, this is a little bit late. And more important, if we failed to allocate it, the error is not checked properly. Even it is NULL, we would still use it. This patch moves the allocation to setup stage and if failed error message would be printed and caller would notice it. Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
-rw-r--r--migration/postcopy-ram.c40
-rw-r--r--migration/postcopy-ram.h7
-rw-r--r--migration/ram.c2
3 files changed, 11 insertions, 38 deletions
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 1f63e65ed7..9a16f52a79 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -1134,6 +1134,16 @@ int postcopy_ram_enable_notify(MigrationIncomingState *mis)
return -1;
}
+ mis->postcopy_tmp_page = mmap(NULL, mis->largest_page_size,
+ PROT_READ | PROT_WRITE, MAP_PRIVATE |
+ MAP_ANONYMOUS, -1, 0);
+ if (mis->postcopy_tmp_page == MAP_FAILED) {
+ mis->postcopy_tmp_page = NULL;
+ error_report("%s: Failed to map postcopy_tmp_page %s",
+ __func__, strerror(errno));
+ return -1;
+ }
+
/*
* Ballooning can mark pages as absent while we're postcopying
* that would cause false userfaults.
@@ -1260,30 +1270,6 @@ int postcopy_place_page_zero(MigrationIncomingState *mis, void *host,
}
}
-/*
- * Returns a target page of memory that can be mapped at a later point in time
- * using postcopy_place_page
- * The same address is used repeatedly, postcopy_place_page just takes the
- * backing page away.
- * Returns: Pointer to allocated page
- *
- */
-void *postcopy_get_tmp_page(MigrationIncomingState *mis)
-{
- if (!mis->postcopy_tmp_page) {
- mis->postcopy_tmp_page = mmap(NULL, mis->largest_page_size,
- PROT_READ | PROT_WRITE, MAP_PRIVATE |
- MAP_ANONYMOUS, -1, 0);
- if (mis->postcopy_tmp_page == MAP_FAILED) {
- mis->postcopy_tmp_page = NULL;
- error_report("%s: %s", __func__, strerror(errno));
- return NULL;
- }
- }
-
- return mis->postcopy_tmp_page;
-}
-
#else
/* No target OS support, stubs just fail */
void fill_destination_postcopy_migration_info(MigrationInfo *info)
@@ -1341,12 +1327,6 @@ int postcopy_place_page_zero(MigrationIncomingState *mis, void *host,
return -1;
}
-void *postcopy_get_tmp_page(MigrationIncomingState *mis)
-{
- assert(0);
- return NULL;
-}
-
int postcopy_wake_shared(struct PostCopyFD *pcfd,
uint64_t client_addr,
RAMBlock *rb)
diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h
index 9c8bd2bae0..fb4cd11d28 100644
--- a/migration/postcopy-ram.h
+++ b/migration/postcopy-ram.h
@@ -100,13 +100,6 @@ typedef enum {
POSTCOPY_INCOMING_END
} PostcopyState;
-/*
- * Allocate a page of memory that can be mapped at a later point in time
- * using postcopy_place_page
- * Returns: Pointer to allocated page
- */
-void *postcopy_get_tmp_page(MigrationIncomingState *mis);
-
PostcopyState postcopy_state_get(void);
/* Set the state and return the old state */
PostcopyState postcopy_state_set(PostcopyState new_state);
diff --git a/migration/ram.c b/migration/ram.c
index e29c8b3408..071687ef37 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -4032,7 +4032,7 @@ static int ram_load_postcopy(QEMUFile *f)
bool matches_target_page_size = false;
MigrationIncomingState *mis = migration_incoming_get_current();
/* Temporary page that is later 'placed' */
- void *postcopy_host_page = postcopy_get_tmp_page(mis);
+ void *postcopy_host_page = mis->postcopy_tmp_page;
void *last_host = NULL;
bool all_zero = false;