target/loongarch: Correct maximum physical address in KVM mode

Commit Message

bibo mao Feb. 19, 2025, 7:07 a.m. UTC

On 3A5000 system, the physical address space width for host is 48,
however 47 bit for KVM VM. For KVM VM, size of physical address space is
the same with that of virtual user space address.

Here modify physical address space width with 47 bit in KVM mode.

Signed-off-by: Bibo Mao <[e-mail]>
---
 target/loongarch/cpu.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)


base-commit: db7aa99ef894e88fc5eedf02ca2579b8c344b2ec

Patch

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index e91f4a5239..32a0d01876 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -406,7 +406,7 @@  static void loongarch_la464_initfn(Object *obj)
 {
     LoongArchCPU *cpu = LOONGARCH_CPU(obj);
     CPULoongArchState *env = &cpu->env;
-    uint32_t data = 0;
+    uint32_t data = 0, field;
     int i;
 
     for (i = 0; i < 21; i++) {
@@ -419,7 +419,13 @@  static void loongarch_la464_initfn(Object *obj)
     data = FIELD_DP32(data, CPUCFG1, ARCH, 2);
     data = FIELD_DP32(data, CPUCFG1, PGMMU, 1);
     data = FIELD_DP32(data, CPUCFG1, IOCSR, 1);
-    data = FIELD_DP32(data, CPUCFG1, PALEN, 0x2f);
+    if (kvm_enabled()) {
+        /* GPA size is 47 for VM, 47 bit - 1 */
+        field = 0x2e;
+    } else {
+        field = 0x2f; /* 48 bit - 1 */
+    }
+    data = FIELD_DP32(data, CPUCFG1, PALEN, field);
     data = FIELD_DP32(data, CPUCFG1, VALEN, 0x2f);
     data = FIELD_DP32(data, CPUCFG1, UAL, 1);
     data = FIELD_DP32(data, CPUCFG1, RI, 1);