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| author | Steve Sistare <steven.sistare@oracle.com> | 2023-06-07 08:18:36 -0700 |
|---|---|---|
| committer | Philippe Mathieu-Daudé <philmd@linaro.org> | 2023-06-13 11:28:58 +0200 |
| commit | b0182e537e5aba38031a5009cb16d5e924342458 (patch) | |
| tree | 67840f4419f12bc9de0005d2cbd0af316f2c4a3d /include/exec | |
| parent | 6fe4f6c941923608027e10af5dd30f18d481f9b9 (diff) | |
| download | qemu-b0182e537e5aba38031a5009cb16d5e924342458.zip qemu-b0182e537e5aba38031a5009cb16d5e924342458.tar.gz qemu-b0182e537e5aba38031a5009cb16d5e924342458.tar.bz2 | |
exec/memory: Introduce RAM_NAMED_FILE flag
migrate_ignore_shared() is an optimization that avoids copying memory
that is visible and can be mapped on the target. However, a
memory-backend-ram or a memory-backend-memfd block with the RAM_SHARED
flag set is not migrated when migrate_ignore_shared() is true. This is
wrong, because the block has no named backing store, and its contents will
be lost. To fix, ignore shared memory iff it is a named file. Define a
new flag RAM_NAMED_FILE to distinguish this case.
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <1686151116-253260-1-git-send-email-steven.sistare@oracle.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Diffstat (limited to 'include/exec')
| -rw-r--r-- | include/exec/cpu-common.h | 1 | ||||
| -rw-r--r-- | include/exec/memory.h | 3 |
2 files changed, 4 insertions, 0 deletions
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index e5a55ed..87dc9a7 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -93,6 +93,7 @@ void qemu_ram_set_uf_zeroable(RAMBlock *rb); bool qemu_ram_is_migratable(RAMBlock *rb); void qemu_ram_set_migratable(RAMBlock *rb); void qemu_ram_unset_migratable(RAMBlock *rb); +bool qemu_ram_is_named_file(RAMBlock *rb); int qemu_ram_get_fd(RAMBlock *rb); size_t qemu_ram_pagesize(RAMBlock *block); diff --git a/include/exec/memory.h b/include/exec/memory.h index c3661b2..47c2e02 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -232,6 +232,9 @@ typedef struct IOMMUTLBEvent { /* RAM that isn't accessible through normal means. */ #define RAM_PROTECTED (1 << 8) +/* RAM is an mmap-ed named file */ +#define RAM_NAMED_FILE (1 << 9) + static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn, IOMMUNotifierFlag flags, hwaddr start, hwaddr end, |