Add feature_config_ctrl for LORegions, which is indicated in
ID_AA64MMFR1_EL1, to program configuration register to trap
guest's using the feature when it is not exposed to the guest.
Change trap_loregion() to use vcpu_feature_is_available()
to simplify checking of the feature's availability.
Signed-off-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 27 ++++++++++++++++++++++++---
1 file changed, 24 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 677815030d44..f3661881cbed 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -374,6 +374,11 @@ static void feature_tracefilt_trap_activate(struct kvm_vcpu *vcpu)
feature_trap_activate(vcpu, VCPU_MDCR_EL2, MDCR_EL2_TTRF, 0);
}
+static void feature_lor_trap_activate(struct kvm_vcpu *vcpu)
+{
+ feature_trap_activate(vcpu, VCPU_HCR_EL2, HCR_TLOR, 0);
+}
+
/* For ID_AA64PFR0_EL1 */
static struct feature_config_ctrl ftr_ctrl_ras = {
.ftr_reg = SYS_ID_AA64PFR0_EL1,
@@ -433,6 +438,15 @@ static struct feature_config_ctrl ftr_ctrl_tracefilt = {
.trap_activate = feature_tracefilt_trap_activate,
};
+/* For ID_AA64MMFR1_EL1 */
+static struct feature_config_ctrl ftr_ctrl_lor = {
+ .ftr_reg = SYS_ID_AA64MMFR1_EL1,
+ .ftr_shift = ID_AA64MMFR1_LOR_SHIFT,
+ .ftr_min = 1,
+ .ftr_signed = FTR_UNSIGNED,
+ .trap_activate = feature_lor_trap_activate,
+};
+
/* id_reg_desc flags field values */
#define ID_DESC_REG_UNALLOC (1UL << 0)
#define ID_DESC_REG_HIDDEN (1UL << 1)
@@ -1003,10 +1017,9 @@ static bool trap_loregion(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
- u64 val = read_id_reg_with_encoding(vcpu, SYS_ID_AA64MMFR1_EL1);
u32 sr = reg_to_encoding(r);
- if (!(val & (0xfUL << ID_AA64MMFR1_LOR_SHIFT))) {
+ if (!vcpu_feature_is_available(vcpu, &ftr_ctrl_lor)) {
kvm_inject_undefined(vcpu);
return false;
}
@@ -3785,6 +3798,14 @@ static struct id_reg_desc id_aa64mmfr0_el1_desc = {
.validate = validate_id_aa64mmfr0_el1,
};
+static struct id_reg_desc id_aa64mmfr1_el1_desc = {
+ .reg_desc = ID_SANITISED(ID_AA64MMFR1_EL1),
+ .trap_features = &(const struct feature_config_ctrl *[]) {
+ &ftr_ctrl_lor,
+ NULL,
+ },
+};
+
static struct id_reg_desc id_aa64dfr0_el1_desc = {
.reg_desc = ID_SANITISED(ID_AA64DFR0_EL1),
.init = init_id_aa64dfr0_el1_desc,
@@ -3901,7 +3922,7 @@ static struct id_reg_desc *id_reg_desc_table[KVM_ARM_ID_REG_MAX_NUM] = {
/* CRm=7 */
ID_DESC(ID_AA64MMFR0_EL1, &id_aa64mmfr0_el1_desc),
- ID_DESC_DEFAULT(ID_AA64MMFR1_EL1),
+ ID_DESC(ID_AA64MMFR1_EL1, &id_aa64mmfr1_el1_desc),
ID_DESC_DEFAULT(ID_AA64MMFR2_EL1),
ID_DESC_UNALLOC(7, 3),
ID_DESC_UNALLOC(7, 4),
--
2.35.1.723.g4982287a31-goog
