diff mbox series

[PULL,1/7] target/loongarch: Add compatible support about VM reboot

Message ID 20240912125132.268802-2-gaosong@loongson.cn
State New
Headers show
Series [PULL,1/7] target/loongarch: Add compatible support about VM reboot | expand

Commit Message

gaosong Sept. 12, 2024, 12:51 p.m. UTC 
From: Bibo Mao <maobibo@loongson.cn>

With edk2-stable202408 LoongArch UEFI bios, CSR PGD register is set only
if its value is equal to zero for boot cpu, it causes reboot issue. Since
CSR PGD register is changed with linux kernel, UEFI BIOS cannot use it.

Add workaround to clear CSR registers relative with TLB in function
loongarch_cpu_reset_hold(), so that VM can reboot with edk2-stable202408
UEFI bios.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240827035807.3326293-1-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/cpu.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
diff mbox series

Patch

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index 5e85b9dbef..115922113a 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -549,6 +549,20 @@  static void loongarch_cpu_reset_hold(Object *obj, ResetType type)
     env->CSR_TLBRERA = FIELD_DP64(env->CSR_TLBRERA, CSR_TLBRERA, ISTLBR, 0);
     env->CSR_MERRCTL = FIELD_DP64(env->CSR_MERRCTL, CSR_MERRCTL, ISMERR, 0);
     env->CSR_TID = cs->cpu_index;
+    /*
+     * Workaround for edk2-stable202408, CSR PGD register is set only if
+     * its value is equal to zero for boot cpu, it causes reboot issue.
+     *
+     * Here clear CSR registers relative with TLB.
+     */
+    env->CSR_PGDH = 0;
+    env->CSR_PGDL = 0;
+    env->CSR_PWCL = 0;
+    env->CSR_PWCH = 0;
+    env->CSR_STLBPS = 0;
+    env->CSR_EENTRY = 0;
+    env->CSR_TLBRENTRY = 0;
+    env->CSR_MERRENTRY = 0;
 
     for (n = 0; n < 4; n++) {
         env->CSR_DMW[n] = FIELD_DP64(env->CSR_DMW[n], CSR_DMW, PLV0, 0);