Check is_zva_enabled when resetting BlockZeroingLowLimit

cnqpzhang · cnqpzhang · commit f23abb943939 · 2025-09-05T15:31:59.000+08:00
Signed-off-by: Patrick Zhang &lt;patrick@os.amperecomputing.com&gt;
diff --git a/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp b/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp
@@ -455,7 +455,7 @@ void VM_Version::initialize() {
   }
   if (!UseBlockZeroing && !FLAG_IS_DEFAULT(BlockZeroingLowLimit)) {
     warning("BlockZeroingLowLimit has been ignored because UseBlockZeroing is disabled");
-    FLAG_SET_DEFAULT(BlockZeroingLowLimit, 4 * VM_Version::zva_length());
+    FLAG_SET_DEFAULT(BlockZeroingLowLimit, is_zva_enabled() ? (4 * VM_Version::zva_length()) : 256);
   }
 
   if (VM_Version::supports_sve2()) {

Original file line number	Diff line number	Diff line change
`@@ -455,7 +455,7 @@ void VM_Version::initialize() {`
`455`	`455`	`}`
`456`	`456`	`if (!UseBlockZeroing && !FLAG_IS_DEFAULT(BlockZeroingLowLimit)) {`
`457`	`457`	`warning("BlockZeroingLowLimit has been ignored because UseBlockZeroing is disabled");`
`458`		`- FLAG_SET_DEFAULT(BlockZeroingLowLimit, 4 * VM_Version::zva_length());`
	`458`	`+ FLAG_SET_DEFAULT(BlockZeroingLowLimit, is_zva_enabled() ? (4 * VM_Version::zva_length()) : 256);`
`459`	`459`	`}`
`460`	`460`
`461`	`461`	`if (VM_Version::supports_sve2()) {`