[libvirt] [PATCH v2 2/4] qemu: caps: add QEMU_CAPS_QCOW2_L2_CACHE_SIZE

[Nikolay Shirokovskiy]

For qemu capable of setting l2-cache-size for qcow2 images
to INT64_MAX and semantics of upper limit on l2 cache
size. We can only check this by qemu version (3.1.0) now.

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
---
 src/qemu/qemu_capabilities.c | 5 +++++
 src/qemu/qemu_capabilities.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 2ca5af3..49a3b60 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -509,6 +509,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "vfio-pci.display",
               "blockdev",
               "vfio-ap",
+              "qcow2.l2-cache-size",
     );
 
 
@@ -4117,6 +4118,10 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_MAX_CPU_COMPAT);
     }
 
+    /* l2-cache-size before 3001000 does not accept INT64_MAX */
+    if (qemuCaps->version >= 3001000)
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_QCOW2_L2_CACHE_SIZE);
+
     if (virQEMUCapsProbeQMPCommands(qemuCaps, mon) < 0)
         goto cleanup;
 
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 6bb9a2c..bb2ac17 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -493,6 +493,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_VFIO_PCI_DISPLAY, /* -device vfio-pci.display */
     QEMU_CAPS_BLOCKDEV, /* -blockdev and blockdev-add are supported */
     QEMU_CAPS_DEVICE_VFIO_AP, /* -device vfio-ap */
+    QEMU_CAPS_QCOW2_L2_CACHE_SIZE, /* -blockdev supports l2-cache-size with INT64_MAX value */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
-- 
1.8.3.1