From: Oliver Upton <oliver.upton@linux.dev> mainline inclusion from mainline-v6.10-rc1 commit 592efc606b549692c7ba6c8f232c4e6028d0382c category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBN3WI CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------------------------------ The naming of some of the feature ID checks is ambiguous. Rephrase the is_id_reg() helper to make its purpose slightly clearer. Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Link: https://lore.kernel.org/r/20240502233529.1958459-2-oliver.upton@linux.dev Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com> --- arch/arm64/kvm/sys_regs.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 507515ab1f86..adff8668985c 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1448,9 +1448,10 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu, const struct sys_reg_desc *r /* * Return true if the register's (Op0, Op1, CRn, CRm, Op2) is - * (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8. + * (3, 0, 0, crm, op2), where 1<=crm<8, 0<=op2<8, which is the range of ID + * registers KVM maintains on a per-VM basis. */ -static inline bool is_id_reg(u32 id) +static inline bool is_vm_ftr_id_reg(u32 id) { return (sys_reg_Op0(id) == 3 && sys_reg_Op1(id) == 0 && sys_reg_CRn(id) == 0 && sys_reg_CRm(id) >= 1 && @@ -3458,7 +3459,7 @@ static void kvm_reset_id_regs(struct kvm_vcpu *vcpu) lockdep_assert_held(&kvm->arch.config_lock); /* Initialize all idregs */ - while (is_id_reg(id)) { + while (is_vm_ftr_id_reg(id)) { IDREG(kvm, id) = idreg->reset(vcpu, idreg); idreg++; @@ -3484,7 +3485,7 @@ void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) for (i = 0; i < ARRAY_SIZE(sys_reg_descs); i++) { const struct sys_reg_desc *r = &sys_reg_descs[i]; - if (is_id_reg(reg_to_encoding(r))) + if (is_vm_ftr_id_reg(reg_to_encoding(r))) continue; if (r->reset) @@ -3972,7 +3973,7 @@ int kvm_vm_ioctl_get_reg_writable_masks(struct kvm *kvm, struct reg_mask_range * * compliant with a given revision of the architecture, but the * RES0/RES1 definitions allow us to do that. */ - if (is_id_reg(encoding)) { + if (is_vm_ftr_id_reg(encoding)) { if (!reg->val || (is_aa32_id_reg(encoding) && !kvm_supports_32bit_el0())) continue; -- 2.33.0