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[RFC,v2,13/28] KVM: arm64: Make ID_DFR1_EL1 writable

Message ID 20211103062520.1445832-14-reijiw@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Make CPU ID registers writable by userspace | expand

Commit Message

Reiji Watanabe Nov. 3, 2021, 6:25 a.m. UTC 
This patch adds id_reg_info for ID_DFR1_EL1 to make it writable
by userspace.

Signed-off-by: Reiji Watanabe <reijiw@google.com>
---
 arch/arm64/kvm/sys_regs.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 8abd3f6fd667..f04067fdaa85 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -835,6 +835,11 @@  static struct id_reg_info id_dfr0_el1_info = {
 	.get_reset_val = get_reset_id_dfr0_el1,
 };
 
+static struct id_reg_info id_dfr1_el1_info = {
+	.sys_reg = SYS_ID_DFR1_EL1,
+	.ftr_check_types = S_FCT(ID_DFR1_MTPMU_SHIFT, FCT_LOWER_SAFE),
+};
+
 /*
  * An ID register that needs special handling to control the value for the
  * guest must have its own id_reg_info in id_reg_info_table.
@@ -845,6 +850,7 @@  static struct id_reg_info id_dfr0_el1_info = {
 #define	GET_ID_REG_INFO(id)	(id_reg_info_table[IDREG_IDX(id)])
 static struct id_reg_info *id_reg_info_table[KVM_ARM_ID_REG_MAX_NUM] = {
 	[IDREG_IDX(SYS_ID_DFR0_EL1)] = &id_dfr0_el1_info,
+	[IDREG_IDX(SYS_ID_DFR1_EL1)] = &id_dfr1_el1_info,
 	[IDREG_IDX(SYS_ID_AA64PFR0_EL1)] = &id_aa64pfr0_el1_info,
 	[IDREG_IDX(SYS_ID_AA64PFR1_EL1)] = &id_aa64pfr1_el1_info,
 	[IDREG_IDX(SYS_ID_AA64DFR0_EL1)] = &id_aa64dfr0_el1_info,