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[Qemu-devel] [PULL 01/12] migration: Test for disabled features on recep
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PULL 01/12] migration: Test for disabled features on reception |
Date: |
Mon, 13 Feb 2017 18:19:37 +0100 |
Right now, if we receive a compressed page while this features are
disabled, Bad Things (TM) can happen. Just add a test for them.
Signed-off-by: Juan Quintela <address@hidden>
--
I had XBZRLE here also, but it don't need extra resources on
destination, only on source. Additionally libvirt don't enable it on
destination, so don't put it here.
---
migration/ram.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/migration/ram.c b/migration/ram.c
index ef8fadf..5817f8c 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2455,7 +2455,7 @@ static int ram_load_postcopy(QEMUFile *f)
static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
- int flags = 0, ret = 0;
+ int flags = 0, ret = 0, invalid_flags;
static uint64_t seq_iter;
int len = 0;
/*
@@ -2470,6 +2470,11 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
ret = -EINVAL;
}
+ invalid_flags = 0;
+
+ if (!migrate_use_compression()) {
+ invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE;
+ }
/* This RCU critical section can be very long running.
* When RCU reclaims in the code start to become numerous,
* it will be necessary to reduce the granularity of this
@@ -2490,6 +2495,15 @@ static int ram_load(QEMUFile *f, void *opaque, int
version_id)
flags = addr & ~TARGET_PAGE_MASK;
addr &= TARGET_PAGE_MASK;
+ if (flags & invalid_flags) {
+ if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) {
+ error_report("Received an unexpected compressed page");
+ }
+
+ ret = -EINVAL;
+ break;
+ }
+
if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE |
RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) {
RAMBlock *block = ram_block_from_stream(f, flags);
--
2.7.4
- [Qemu-devel] [PATCH 00/12] Multifd v4, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 02/12] migration: Don't create decompression threads if not enabled, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 03/12] migration: Add multifd capability, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 01/12] migration: Test for disabled features on reception,
Juan Quintela <=
- [Qemu-devel] [PULL 04/12] migration: Create x-multifd-threads parameter, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 06/12] migration: Create multifd migration threads, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 05/12] migration: Create x-multifd-group parameter, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 11/12] migration: Send the fd number which we are going to use for this page, Juan Quintela, 2017/02/13
- [Qemu-devel] [PULL 07/12] migration: Start of multiple fd work, Juan Quintela, 2017/02/13