From 10561682792d0ea540235636e80b0b3e85ce412a Mon Sep 17 00:00:00 2001

Message-Id: <10561682792d0ea540235636e80b0b3e85ce412a@dist-git>

From: Peter Krempa <pkrempa@redhat.com>

Date: Wed, 28 Jul 2021 17:37:21 +0200

Subject: [PATCH] RHEL: Enable usage of x-blockdev-reopen

MIME-Version: 1.0

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RHEL-only

Introduce a new capability QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API

based on the presence of '__com.redhat_rhel-av-8_2_0-api' feature for

'x-blockdev-reopen' which states that reopen works for what libvirt

is going to use it and wire up code to call the x- prefixed command.

This implementation will become dormant once qemu starts supporting

upstream-stable blockdev-reopen.

https://bugzilla.redhat.com/show_bug.cgi?id=1799013

Starting with libvirt-7.6, upstream has adapted to the new format of

arguments so this patch was modified to support blockdev-reopen which

takes an array of nodes to reopen.

https://bugzilla.redhat.com/show_bug.cgi?id=1929765

Message-Id: <3fcde2fc6add36d5276ae224caf18adc8bca7d48.1627486352.git.pkrempa@redhat.com>

Reviewed-by: Ján Tomko <jtomko@redhat.com>

---

 src/qemu/qemu_block.c        | 24 +++++++++++++++---------

 src/qemu/qemu_block.h        |  3 ++-

 src/qemu/qemu_capabilities.c | 11 +++++++++++

 src/qemu/qemu_capabilities.h |  1 +

 src/qemu/qemu_monitor.c      |  5 +++--

 src/qemu/qemu_monitor.h      |  3 ++-

 src/qemu/qemu_monitor_json.c | 12 +++++++++---

 src/qemu/qemu_monitor_json.h |  3 ++-

 tests/qemumonitorjsontest.c  |  2 +-

 9 files changed, 46 insertions(+), 18 deletions(-)

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c

index 53a0b919f9..8871eb9fdc 100644

--- a/src/qemu/qemu_block.c

+++ b/src/qemu/qemu_block.c

@@ -3322,7 +3322,8 @@ qemuBlockBitmapsHandleCommitFinish(virStorageSource *topsrc,

 int

 qemuBlockReopenFormatMon(qemuMonitor *mon,

-                         virStorageSource *src)

+                         virStorageSource *src,

+                         bool downstream)

 {

     g_autoptr(virJSONValue) reopenprops = NULL;

     g_autoptr(virJSONValue) srcprops = NULL;

@@ -3331,15 +3332,19 @@ qemuBlockReopenFormatMon(qemuMonitor *mon,

     if (!(srcprops = qemuBlockStorageSourceGetBlockdevProps(src, src->backingStore)))

         return -1;

-    if (virJSONValueArrayAppend(reopenoptions, &srcprops) < 0)

-        return -1;

+    if (downstream) {

+        reopenprops = g_steal_pointer(&srcprops);

+    } else {

+        if (virJSONValueArrayAppend(reopenoptions, &srcprops) < 0)

+            return -1;

-    if (virJSONValueObjectAdd(&reopenprops,

-                              "a:options", &reopenoptions,

-                              NULL) < 0)

-        return -1;

+        if (virJSONValueObjectAdd(&reopenprops,

+                                  "a:options", &reopenoptions,

+                                  NULL) < 0)

+            return -1;

+    }

-    if (qemuMonitorBlockdevReopen(mon, &reopenprops) < 0)

+    if (qemuMonitorBlockdevReopen(mon, &reopenprops, downstream) < 0)

         return -1;

     return 0;

@@ -3363,6 +3368,7 @@ qemuBlockReopenFormat(virDomainObj *vm,

 {

     qemuDomainObjPrivate *priv = vm->privateData;

     virQEMUDriver *driver = priv->driver;

+    bool downstream = virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API);

     int rc;

     /* If we are lacking the object here, qemu might have opened an image with

@@ -3376,7 +3382,7 @@ qemuBlockReopenFormat(virDomainObj *vm,

     if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)

         return -1;

-    rc = qemuBlockReopenFormatMon(priv->mon, src);

+    rc = qemuBlockReopenFormatMon(priv->mon, src, downstream);

     if (qemuDomainObjExitMonitor(driver, vm) < 0 || rc < 0)

         return -1;

diff --git a/src/qemu/qemu_block.h b/src/qemu/qemu_block.h

index 54601a48a9..88fc9974c4 100644

--- a/src/qemu/qemu_block.h

+++ b/src/qemu/qemu_block.h

@@ -268,7 +268,8 @@ qemuBlockBitmapsHandleCommitFinish(virStorageSource *topsrc,

 /* only for use in qemumonitorjsontest */

 int

 qemuBlockReopenFormatMon(qemuMonitor *mon,

-                         virStorageSource *src);

+                         virStorageSource *src,

+                         bool downstream);

 int

 qemuBlockReopenReadWrite(virDomainObj *vm,

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c

index 30a557706b..f6ea51d17e 100644

--- a/src/qemu/qemu_capabilities.c

+++ b/src/qemu/qemu_capabilities.c

@@ -651,6 +651,7 @@ VIR_ENUM_IMPL(virQEMUCaps,

               "device.json", /* QEMU_CAPS_DEVICE_JSON */

               "query-dirty-rate", /* QEMU_CAPS_QUERY_DIRTY_RATE */

               "rbd-encryption", /* QEMU_CAPS_RBD_ENCRYPTION */

+              "blockdev-reopen.__com.redhat_rhel-av-8_2_0-api", /* QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API */

     );

@@ -1536,6 +1537,7 @@ static struct virQEMUCapsDevicePropsFlags virQEMUCapsDevicePropsVhostUserFS[] =

 /* see documentation for virQEMUQAPISchemaPathGet for the query format */

 static struct virQEMUCapsStringFlags virQEMUCapsQMPSchemaQueries[] = {

     { "block-commit/arg-type/*top",  QEMU_CAPS_ACTIVE_COMMIT },

+    { "x-blockdev-reopen/$__com.redhat_rhel-av-8_2_0-api", QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API },

     { "blockdev-add/arg-type/options/+gluster/debug-level", QEMU_CAPS_GLUSTER_DEBUG_LEVEL},

     { "blockdev-add/arg-type/+gluster/debug", QEMU_CAPS_GLUSTER_DEBUG_LEVEL},

     { "blockdev-add/arg-type/+vxhs", QEMU_CAPS_VXHS},

@@ -5189,6 +5191,15 @@ virQEMUCapsInitProcessCaps(virQEMUCaps *qemuCaps)

         qemuCaps->arch == VIR_ARCH_MIPS)

         virQEMUCapsSet(qemuCaps, QEMU_CAPS_SCSI_NCR53C90);

+    /* RHEL-only:

+     * - if upstream blockdev-reopen is enabled, clear the downstream flag

+     * - if the downstream flag is present but not the upstream, assert the upstream flag too

+     */

+    if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN))

+        virQEMUCapsClear(qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API);

+    if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API))

+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_BLOCKDEV_REOPEN);

+

     virQEMUCapsInitProcessCapsInterlock(qemuCaps);

 }

diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h

index 61bdbdb2ac..79c05d603c 100644

--- a/src/qemu/qemu_capabilities.h

+++ b/src/qemu/qemu_capabilities.h

@@ -631,6 +631,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */

     QEMU_CAPS_DEVICE_JSON, /* -device accepts JSON */

     QEMU_CAPS_QUERY_DIRTY_RATE, /* accepts query-dirty-rate */

     QEMU_CAPS_RBD_ENCRYPTION, /* Ceph RBD encryption support */

+    QEMU_CAPS_BLOCKDEV_REOPEN_COM_REDHAT_AV_8_2_0_API, /* downstream support for blockdev reopen in rhel-av-8.2.0 */

     QEMU_CAPS_LAST /* this must always be the last item */

 } virQEMUCapsFlags;

diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c

index 26b59801b8..ad00e471d6 100644

--- a/src/qemu/qemu_monitor.c

+++ b/src/qemu/qemu_monitor.c

@@ -4291,14 +4291,15 @@ qemuMonitorBlockdevAdd(qemuMonitor *mon,

 int

 qemuMonitorBlockdevReopen(qemuMonitor *mon,

-                          virJSONValue **props)

+                          virJSONValue **props,

+                          bool downstream)

 {

     VIR_DEBUG("props=%p (node-name=%s)", *props,

               NULLSTR(virJSONValueObjectGetString(*props, "node-name")));

     QEMU_CHECK_MONITOR(mon);

-    return qemuMonitorJSONBlockdevReopen(mon, props);

+    return qemuMonitorJSONBlockdevReopen(mon, props, downstream);

 }

diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h

index 99ecebc648..acbc49cc69 100644

--- a/src/qemu/qemu_monitor.h

+++ b/src/qemu/qemu_monitor.h

@@ -1422,7 +1422,8 @@ int qemuMonitorBlockdevAdd(qemuMonitor *mon,

                            virJSONValue **props);

 int qemuMonitorBlockdevReopen(qemuMonitor *mon,

-                              virJSONValue **props);

+                              virJSONValue **props,

+                              bool downstream);

 int qemuMonitorBlockdevDel(qemuMonitor *mon,

                            const char *nodename);

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c

index 56f0b22b2a..efaee0d28c 100644

--- a/src/qemu/qemu_monitor_json.c

+++ b/src/qemu/qemu_monitor_json.c

@@ -8009,13 +8009,19 @@ qemuMonitorJSONBlockdevAdd(qemuMonitor *mon,

 int

 qemuMonitorJSONBlockdevReopen(qemuMonitor *mon,

-                              virJSONValue **props)

+                              virJSONValue **props,

+                              bool downstream)

 {

     g_autoptr(virJSONValue) cmd = NULL;

     g_autoptr(virJSONValue) reply = NULL;

-    if (!(cmd = qemuMonitorJSONMakeCommandInternal("blockdev-reopen", props)))

-        return -1;

+    if (downstream) {

+        if (!(cmd = qemuMonitorJSONMakeCommandInternal("x-blockdev-reopen", props)))

+            return -1;

+    } else {

+        if (!(cmd = qemuMonitorJSONMakeCommandInternal("blockdev-reopen", props)))

+            return -1;

+    }

     if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)

         return -1;

diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h

index f7fb13f56c..61389d9dd8 100644

--- a/src/qemu/qemu_monitor_json.h

+++ b/src/qemu/qemu_monitor_json.h

@@ -594,7 +594,8 @@ int qemuMonitorJSONBlockdevAdd(qemuMonitor *mon,

     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);

 int qemuMonitorJSONBlockdevReopen(qemuMonitor *mon,

-                                  virJSONValue **props)

+                                  virJSONValue **props,

+                                  bool downstream)

     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);

 int qemuMonitorJSONBlockdevDel(qemuMonitor *mon,

diff --git a/tests/qemumonitorjsontest.c b/tests/qemumonitorjsontest.c

index bcf5caa9a4..b6cec5e362 100644

--- a/tests/qemumonitorjsontest.c

+++ b/tests/qemumonitorjsontest.c

@@ -2784,7 +2784,7 @@ testQemuMonitorJSONBlockdevReopen(const void *opaque)

     if (qemuMonitorTestAddItem(test, "blockdev-reopen", "{\"return\":{}}") < 0)

         return -1;

-    if (qemuBlockReopenFormatMon(qemuMonitorTestGetMonitor(test), src) < 0)

+    if (qemuBlockReopenFormatMon(qemuMonitorTestGetMonitor(test), src, false) < 0)

         return -1;

     return 0;

-- 

2.34.1