[libvirt RFCv9 17/31] qemu: saveimage: add multifd related fields to save format

[Claudio Fontana]

add both multifd compression and number of multifd channels

Signed-off-by: Claudio Fontana <cfontana at suse.de>
---
 src/qemu/qemu_saveimage.c | 17 +++++++++++++++++
 src/qemu/qemu_saveimage.h |  4 +++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_saveimage.c b/src/qemu/qemu_saveimage.c
index 2b56214f90..e2cca4a417 100644
--- a/src/qemu/qemu_saveimage.c
+++ b/src/qemu/qemu_saveimage.c
@@ -67,6 +67,23 @@ VIR_ENUM_IMPL(qemuSaveCompression,
               "lzop",
 );
 
+typedef enum {
+    QEMU_SAVE_MULTIFD_COMP_NONE = 0,
+    QEMU_SAVE_MULTIFD_COMP_ZLIB = 1,
+    QEMU_SAVE_MULTIFD_COMP_ZSTD = 2,
+
+    /* used for the on-disk format, do not change/re-use numbers */
+    QEMU_SAVE_MULTIFD_COMP_LAST
+} virQEMUSaveMultiFdComp;
+
+VIR_ENUM_DECL(qemuSaveMultiFdComp);
+VIR_ENUM_IMPL(qemuSaveMultiFdComp,
+              QEMU_SAVE_MULTIFD_COMP_LAST,
+              "none",
+              "zlib",
+              "zstd",
+);
+
 static inline void
 qemuSaveImageBswapHeader(virQEMUSaveHeader *hdr)
 {
diff --git a/src/qemu/qemu_saveimage.h b/src/qemu/qemu_saveimage.h
index 9d66eb40bb..21e335b530 100644
--- a/src/qemu/qemu_saveimage.h
+++ b/src/qemu/qemu_saveimage.h
@@ -42,7 +42,9 @@ struct _virQEMUSaveHeader {
     uint32_t was_running;                  /*    4 bytes */
     uint32_t compressed;                   /*    4 bytes */
     uint32_t cookieOffset;                 /*    4 bytes */
-    uint32_t unused[14];                   /*   56 bytes */
+    uint16_t multifd_channels;             /*    2 bytes */
+    uint16_t multifd_comp;                 /*    2 bytes */
+    uint32_t unused[13];                   /*   52 bytes */
 } ATTRIBUTE_PACKED;                        /* = 92 bytes */
 
 
-- 
2.35.3