@@ -2775,6 +2775,9 @@ int kvm_sys_reg_set_user(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg,
if (!r)
return -ENOENT;
+ if (sysreg_user_write_ignore(vcpu, r))
+ return 0;
+
if (r->set_user) {
ret = (r->set_user)(vcpu, r, val);
} else {
@@ -86,6 +86,7 @@ struct sys_reg_desc {
#define REG_HIDDEN (1 << 0) /* hidden from userspace and guest */
#define REG_RAZ (1 << 1) /* RAZ from userspace and guest */
+#define REG_USER_WI (1 << 2) /* WI from userspace only */
static __printf(2, 3)
inline void print_sys_reg_msg(const struct sys_reg_params *p,
@@ -157,6 +158,12 @@ static inline bool sysreg_visible_as_raz(const struct kvm_vcpu *vcpu,
return sysreg_visibility(vcpu, r) & REG_RAZ;
}
+static inline bool sysreg_user_write_ignore(const struct kvm_vcpu *vcpu,
+ const struct sys_reg_desc *r)
+{
+ return sysreg_visibility(vcpu, r) & REG_USER_WI;
+}
+
static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
const struct sys_reg_desc *i2)
{
We're about to ignore writes to AArch32 ID registers on AArch64-only systems. Add a bit to indicate a register is handled as write ignore when accessed from userspace. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> --- arch/arm64/kvm/sys_regs.c | 3 +++ arch/arm64/kvm/sys_regs.h | 7 +++++++ 2 files changed, 10 insertions(+)