[RFC PATCH 21/25] KVM: arm64: Trap disabled features of ID_AA64DFR0_EL1

[Reiji Watanabe]

Add feature_config_ctrl for PMUv3, PMS and TraceFilt, which are
indicated in ID_AA64DFR0_EL1, to program configuration registers
to trap guest's using those features when they are not exposed to
the guest.

Signed-off-by: Reiji Watanabe <reijiw at google.com>
---
 arch/arm64/kvm/sys_regs.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 595ab1c79bae..23a3bcac4986 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -342,6 +342,38 @@ static struct feature_config_ctrl ftr_ctrl_mte = {
 	.cfg_val = HCR_TID5,
 };
 
+/* For ID_AA64DFR0_EL1 */
+static struct feature_config_ctrl ftr_ctrl_pmuv3 = {
+	.ftr_reg = SYS_ID_AA64DFR0_EL1,
+	.ftr_shift = ID_AA64DFR0_PMUVER_SHIFT,
+	.ftr_min = ID_AA64DFR0_PMUVER_8_0,
+	.ftr_signed = FTR_UNSIGNED,
+	.cfg_reg = VCPU_MDCR_EL2,
+	.cfg_mask = MDCR_EL2_TPM,
+	.cfg_val = MDCR_EL2_TPM,
+};
+
+static struct feature_config_ctrl ftr_ctrl_pms = {
+	.ftr_reg = SYS_ID_AA64DFR0_EL1,
+	.ftr_shift = ID_AA64DFR0_PMSVER_SHIFT,
+	.ftr_min = ID_AA64DFR0_PMSVER_8_2,
+	.ftr_signed = FTR_UNSIGNED,
+	.cfg_reg = VCPU_MDCR_EL2,
+	.cfg_mask = (MDCR_EL2_TPMS |
+			(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT)),
+	.cfg_val = MDCR_EL2_TPMS,
+};
+
+static struct feature_config_ctrl ftr_ctrl_tracefilt = {
+	.ftr_reg = SYS_ID_AA64DFR0_EL1,
+	.ftr_shift = ID_AA64DFR0_TRACE_FILT_SHIFT,
+	.ftr_min = 1,
+	.ftr_signed = FTR_UNSIGNED,
+	.cfg_reg = VCPU_MDCR_EL2,
+	.cfg_mask = MDCR_EL2_TTRF,
+	.cfg_val = MDCR_EL2_TTRF,
+};
+
 struct id_reg_info {
 	u32	sys_reg;	/* Register ID */
 	u64	sys_val;	/* Sanitized system value */
@@ -727,6 +759,12 @@ static struct id_reg_info id_aa64dfr0_el1_info = {
 	.init = init_id_aa64dfr0_el1_info,
 	.validate = validate_id_aa64dfr0_el1,
 	.get_reset_val = get_reset_id_aa64dfr0_el1,
+	.trap_features = &(const struct feature_config_ctrl *[]) {
+		&ftr_ctrl_pmuv3,
+		&ftr_ctrl_pms,
+		&ftr_ctrl_tracefilt,
+		NULL,
+	},
 };
 
 static struct id_reg_info id_dfr0_el1_info = {
-- 
2.33.0.882.g93a45727a2-goog