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[Qemu-devel] [PATCH v2 02/16] postcopy: Transmit and compare individual
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [PATCH v2 02/16] postcopy: Transmit and compare individual page sizes |
Date: |
Mon, 6 Feb 2017 17:32:52 +0000 |
From: "Dr. David Alan Gilbert" <address@hidden>
When using postcopy with hugepages, we require the source
and destination page sizes for any RAMBlock to match; note
that different RAMBlocks in the same VM can have different
page sizes.
Transmit them as part of the RAM information header and
fail if there's a difference.
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
---
migration/ram.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/migration/ram.c b/migration/ram.c
index b405e4a..5726563 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1979,6 +1979,9 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
qemu_put_byte(f, strlen(block->idstr));
qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
qemu_put_be64(f, block->used_length);
+ if (migrate_postcopy_ram() && block->page_size != qemu_host_page_size)
{
+ qemu_put_be64(f, block->page_size);
+ }
}
rcu_read_unlock();
@@ -2480,6 +2483,8 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
* be atomic
*/
bool postcopy_running = postcopy_state_get() >=
POSTCOPY_INCOMING_LISTENING;
+ /* ADVISE is earlier, it shows the source has the postcopy capability on */
+ bool postcopy_advised = postcopy_state_get() >= POSTCOPY_INCOMING_ADVISE;
seq_iter++;
@@ -2544,6 +2549,18 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
error_report_err(local_err);
}
}
+ /* For postcopy we need to check hugepage sizes match */
+ if (postcopy_advised &&
+ block->page_size != qemu_host_page_size) {
+ uint64_t remote_page_size = qemu_get_be64(f);
+ if (remote_page_size != block->page_size) {
+ error_report("Mismatched RAM page size %s "
+ "(local) %zd != %" PRId64,
+ id, block->page_size,
+ remote_page_size);
+ ret = -EINVAL;
+ }
+ }
ram_control_load_hook(f, RAM_CONTROL_BLOCK_REG,
block->idstr);
} else {
--
2.9.3
[Qemu-devel] [PATCH v2 07/16] postcopy: Record largest page size, Dr. David Alan Gilbert (git), 2017/02/06
[Qemu-devel] [PATCH v2 11/16] postcopy: Mask fault addresses to huge page boundary, Dr. David Alan Gilbert (git), 2017/02/06