[PATCH v2] LXC: trivially support flag VIR_DRV_FEATURE_TYPED_PARAM_STRING

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fix:
virsh -c lxc:/// memtune DOMAIN
error: Unable to get number of memory parameters
error: unsupported flags (0x4) in function lxcDomainGetMemoryParameters

Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>
---
v2: also fix a similar issue in lxcDomainGetSchedulerParametersFlags

 src/lxc/lxc_driver.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 06f3e18..d8a31d3 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -895,7 +895,13 @@ lxcDomainGetMemoryParameters(virDomainPtr dom,
     size_t i;
 
     virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
-                  VIR_DOMAIN_AFFECT_CONFIG, -1);
+                  VIR_DOMAIN_AFFECT_CONFIG,
+                  VIR_TYPED_PARAM_STRING_OKAY, -1);
+
+    /* We blindly return a string, and let libvirt.c and
+     * remote_driver.c do the filtering on behalf of older clients
+     * that can't parse it.  */
+    flags &= ~VIR_TYPED_PARAM_STRING_OKAY;
 
     if (!(vm = lxcDomObjFromDomain(dom)))
         goto cleanup;
@@ -1993,7 +1999,13 @@ lxcDomainGetSchedulerParametersFlags(virDomainPtr dom,
     virLXCDomainObjPrivatePtr priv;
 
     virCheckFlags(VIR_DOMAIN_AFFECT_LIVE |
-                  VIR_DOMAIN_AFFECT_CONFIG, -1);
+                  VIR_DOMAIN_AFFECT_CONFIG |
+                  VIR_TYPED_PARAM_STRING_OKAY, -1);
+
+    /* We blindly return a string, and let libvirt.c and
+     * remote_driver.c do the filtering on behalf of older clients
+     * that can't parse it.  */
+    flags &= ~VIR_TYPED_PARAM_STRING_OKAY;
 
     if (!(vm = lxcDomObjFromDomain(dom)))
         goto cleanup;
-- 
1.9.0

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