diff --git a/target-arm-clear-EL2-and-EL3-only-when-kvm-is-not-en.patch b/target-arm-clear-EL2-and-EL3-only-when-kvm-is-not-en.patch new file mode 100644 index 0000000..a8d5ac0 --- /dev/null +++ b/target-arm-clear-EL2-and-EL3-only-when-kvm-is-not-en.patch @@ -0,0 +1,43 @@ +From 20bd52038a960e0c959af38a5d3d7a6601db8e8b Mon Sep 17 00:00:00 2001 +From: Peng Liang +Date: Mon, 21 Sep 2020 22:14:20 +0800 +Subject: [PATCH] target/arm: clear EL2 and EL3 only when kvm is not enabled + +When has_el2 and has_el3 are disabled, which is the default value for +virt machine, QEMU will clear the corresponding field in ID_PFR1_EL1 and +ID_AA64PFR0_EL1 to not expose EL3 and EL2 to guest. Because KVM doesn't +support to emulate ID registers in AArch64 before, it will not take +effect. Hence, clear EL2 and EL3 only when kvm is not enabled for +backwards compatibility. + +Signed-off-by: Peng Liang +Signed-off-by: Dongxu Sun +--- + target/arm/cpu.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/target/arm/cpu.c b/target/arm/cpu.c +index 1c1647a0a8..65163f5135 100644 +--- a/target/arm/cpu.c ++++ b/target/arm/cpu.c +@@ -2283,7 +2283,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp) + } + } + +- if (!arm_feature(env, ARM_FEATURE_M) && !cpu->has_el3) { ++ if (!arm_feature(env, ARM_FEATURE_M) && !cpu->has_el3 && !kvm_enabled()) { + /* If the has_el3 CPU property is disabled then we need to disable the + * feature. + */ +@@ -2324,7 +2324,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp) + cpu->pmceid1 = 0; + } + +- if (!arm_feature(env, ARM_FEATURE_EL2)) { ++ if (!arm_feature(env, ARM_FEATURE_EL2) && !kvm_enabled()) { + /* Disable the hypervisor feature bits in the processor feature + * registers if we don't have EL2. These are id_pfr1[15:12] and + * id_aa64pfr0_el1[11:8]. +-- +2.27.0 +