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[v7,17/38] KVM: arm64: KVM: arm64: Make ID_MMFR0_EL1 writable

Message ID 20220419065544.3616948-18-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 April 19, 2022, 6:55 a.m. UTC 
This patch adds id_reg_desc for ID_MMFR0_EL1 to make it writable
by userspace.

Signed-off-by: Reiji Watanabe <reijiw@google.com>
---
 arch/arm64/kvm/sys_regs.c | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 3892278deb09..dfcf95eee139 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -4149,6 +4149,14 @@  static struct id_reg_desc id_dfr1_el1_desc = {
 	},
 };
 
+static struct id_reg_desc id_mmfr0_el1_desc = {
+	.reg_desc = ID_SANITISED(ID_MMFR0_EL1),
+	.ftr_bits = {
+		S_FTR_BITS(FTR_LOWER_SAFE, ID_MMFR0_OUTERSHR_SHIFT, 0xf),
+		S_FTR_BITS(FTR_LOWER_SAFE, ID_MMFR0_INNERSHR_SHIFT, 0xf),
+	},
+};
+
 #define ID_DESC(id_reg_name, id_reg_desc)	\
 	[IDREG_IDX(SYS_##id_reg_name)] = (id_reg_desc)
 
@@ -4156,6 +4164,7 @@  static struct id_reg_desc id_dfr1_el1_desc = {
 static struct id_reg_desc *id_reg_desc_table[KVM_ARM_ID_REG_MAX_NUM] = {
 	/* CRm=1 */
 	ID_DESC(ID_DFR0_EL1, &id_dfr0_el1_desc),
+	ID_DESC(ID_MMFR0_EL1, &id_mmfr0_el1_desc),
 
 	/* CRm=3 */
 	ID_DESC(ID_DFR1_EL1, &id_dfr1_el1_desc),