On 2026/7/10 上午11:02, Bibo Mao wrote:
On 2026/7/10 上午8:50, Tao Cui wrote:
From: Tao Cui <[email protected]>
pv_features holds the value of pseudo-register CPUCFG_KVM_FEATURE and
is now
pushed per vCPU. Add it to the vCPU VMState as a subsection (sent when
non-zero) so it travels with the vCPU across migration between host
kernel
versions.
Signed-off-by: Tao Cui <[email protected]>
---
target/loongarch/machine.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/target/loongarch/machine.c b/target/loongarch/machine.c
index 931a5ca5ba..b8819bd44d 100644
--- a/target/loongarch/machine.c
+++ b/target/loongarch/machine.c
@@ -65,6 +65,24 @@ static const VMStateDescription vmstate_msgint = {
},
};
+static bool pv_features_needed(void *opaque)
+{
+ LoongArchCPU *cpu = opaque;
+
+ return cpu->env.pv_features != 0;
I think cpu->no_pv_feature should be check here. For QEMU 11.1
pv_feature is not supported for migration, for later version it
supports, something like this:
return !cpu->no_pv_feature;
For successful migration, env.pv_features from source host should be
subset of destination host, there should be such checking also.
Regards
Bibo Mao
+}
+
+static const VMStateDescription vmstate_pv_features = {
+ .name = "cpu/pv_features",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = pv_features_needed,
+ .fields = (const VMStateField[]) {
+ VMSTATE_UINT32(env.pv_features, LoongArchCPU),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
static const VMStateDescription vmstate_lsxh_reg = {
.name = "lsxh_reg",
.version_id = 1,
@@ -289,6 +307,7 @@ const VMStateDescription vmstate_loongarch_cpu = {
&vmstate_lbt,
&vmstate_msgint,
&vmstate_pmu,
+ &vmstate_pv_features,
NULL
}
};
