Enable writable from userspace for ID_AA64MMFR{0, 1, 2, 3}_EL1.
Added a macro for defining general writable idregs.
Signed-off-by: Jing Zhang <jingzhangos@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 38 +++++++++++++++++++++++++++++++-------
1 file changed, 31 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 12b81ab27dbe..d560fc178a76 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1346,9 +1346,6 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT);
val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_MOPS);
break;
- case SYS_ID_AA64MMFR2_EL1:
- val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
- break;
case SYS_ID_MMFR4_EL1:
val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX);
break;
@@ -1582,6 +1579,18 @@ static int set_id_dfr0_el1(struct kvm_vcpu *vcpu,
return set_id_reg(vcpu, rd, val);
}
+static u64 read_sanitised_id_aa64mmfr2_el1(struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *rd)
+{
+ u64 val;
+ u32 id = reg_to_encoding(rd);
+
+ val = read_sanitised_ftr_reg(id);
+ val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
+
+ return val;
+}
+
/*
* cpufeature ID register user accessors
*
@@ -1856,6 +1865,16 @@ static unsigned int elx2_visibility(const struct kvm_vcpu *vcpu,
.val = 0, \
}
+#define ID_SANITISED_WRITABLE(name) { \
+ SYS_DESC(SYS_##name), \
+ .access = access_id_reg, \
+ .get_user = get_id_reg, \
+ .set_user = set_id_reg, \
+ .visibility = id_visibility, \
+ .reset = kvm_read_sanitised_id_reg, \
+ .val = GENMASK(63, 0), \
+}
+
/* sys_reg_desc initialiser for known cpufeature ID registers */
#define AA32_ID_SANITISED(name) { \
SYS_DESC(SYS_##name), \
@@ -2077,10 +2096,15 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_UNALLOCATED(6,7),
/* CRm=7 */
- ID_SANITISED(ID_AA64MMFR0_EL1),
- ID_SANITISED(ID_AA64MMFR1_EL1),
- ID_SANITISED(ID_AA64MMFR2_EL1),
- ID_SANITISED(ID_AA64MMFR3_EL1),
+ ID_SANITISED_WRITABLE(ID_AA64MMFR0_EL1),
+ ID_SANITISED_WRITABLE(ID_AA64MMFR1_EL1),
+ { SYS_DESC(SYS_ID_AA64MMFR2_EL1),
+ .access = access_id_reg,
+ .get_user = get_id_reg,
+ .set_user = set_id_reg,
+ .reset = read_sanitised_id_aa64mmfr2_el1,
+ .val = GENMASK(63, 0), },
+ ID_SANITISED_WRITABLE(ID_AA64MMFR3_EL1),
ID_UNALLOCATED(7,4),
ID_UNALLOCATED(7,5),
ID_UNALLOCATED(7,6),
--
2.41.0.255.g8b1d071c50-goog
