[RFC PATCH v3 23/29] KVM: arm64: Trap disabled features of ID_AA64PFR1_EL1

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Add feature_config_ctrl for MTE, which is indicated in
ID_AA64PFR1_EL1, to program configuration register to trap the
guest's using the feature when it is not exposed to the guest.

Signed-off-by: Reiji Watanabe <reijiw@xxxxxxxxxx>
---
 arch/arm64/kvm/sys_regs.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 42db8cf18fbb..73d992ba6e90 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -426,6 +426,17 @@ static struct feature_config_ctrl ftr_ctrl_amu = {
 	.cfg_val = CPTR_EL2_TAM,
 };
 
+/* For ID_AA64PFR1_EL1 */
+static struct feature_config_ctrl ftr_ctrl_mte = {
+	.ftr_reg = SYS_ID_AA64PFR1_EL1,
+	.ftr_shift = ID_AA64PFR1_MTE_SHIFT,
+	.ftr_min = ID_AA64PFR1_MTE_EL0,
+	.ftr_signed = FTR_UNSIGNED,
+	.cfg_reg = VCPU_HCR_EL2,
+	.cfg_mask = (HCR_TID5 | HCR_DCT | HCR_ATA),
+	.cfg_val = HCR_TID5,
+};
+
 struct id_reg_info {
 	u32	sys_reg;	/* Register ID */
 	u64	sys_val;	/* Sanitized system value */
@@ -904,6 +915,10 @@ static struct id_reg_info id_aa64pfr1_el1_info = {
 	.init = init_id_aa64pfr1_el1_info,
 	.validate = validate_id_aa64pfr1_el1,
 	.get_reset_val = get_reset_id_aa64pfr1_el1,
+	.trap_features = &(const struct feature_config_ctrl *[]) {
+		&ftr_ctrl_mte,
+		NULL,
+	},
 };
 
 static struct id_reg_info id_aa64isar0_el1_info = {
-- 
2.34.0.rc1.387.gb447b232ab-goog




[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux