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[RFC,v2,14/28] KVM: arm64: Make ID_MMFR0_EL1 writable

Message ID 20211103062520.1445832-15-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_MMFR0_EL1 to make it writable
by userspace.

Signed-off-by: Reiji Watanabe <reijiw@google.com>
---
 arch/arm64/kvm/sys_regs.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index f04067fdaa85..cfa3624ee081 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -840,6 +840,12 @@  static struct id_reg_info id_dfr1_el1_info = {
 	.ftr_check_types = S_FCT(ID_DFR1_MTPMU_SHIFT, FCT_LOWER_SAFE),
 };
 
+static struct id_reg_info id_mmfr0_el1_info = {
+	.sys_reg = SYS_ID_MMFR0_EL1,
+	.ftr_check_types = S_FCT(ID_MMFR0_INNERSHR_SHIFT, FCT_LOWER_SAFE) |
+			   S_FCT(ID_MMFR0_OUTERSHR_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.
@@ -850,6 +856,7 @@  static struct id_reg_info id_dfr1_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_MMFR0_EL1)] = &id_mmfr0_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,