From: Zhou Wang <wangzhou1@hisilicon.com> virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC7KH5 ------------------------------------------------------------------------ IPIV uses the MPIDR value to transmit vpeid to hardware, so don't allow to change it. Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com> Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com> --- arch/arm64/kvm/sys_regs.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 33b0280024f8..8cd4c95759a0 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1568,6 +1568,25 @@ static u64 read_sanitised_id_dfr0_el1(struct kvm_vcpu *vcpu, return val; } +#ifdef CONFIG_ARM64_HISI_IPIV +extern struct static_key_false ipiv_enable; +static int set_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, + u64 val) +{ + if (static_branch_unlikely(&ipiv_enable) && + vcpu->kvm->arch.vgic.its_vm.enable_ipiv_from_vmm) { + if (val != __vcpu_sys_reg(vcpu, rd->reg)) { + kvm_err("IPIV ERROR: MPIDR changed\n"); + return -EINVAL; + } + } + + __vcpu_sys_reg(vcpu, rd->reg) = val; + + return 0; +} +#endif + static int set_id_dfr0_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd, u64 val) @@ -2073,7 +2092,12 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_DBGVCR32_EL2), NULL, reset_val, DBGVCR32_EL2, 0 }, +#ifdef CONFIG_ARM64_HISI_IPIV + { SYS_DESC(SYS_MPIDR_EL1), + .reset = reset_mpidr, .reg = MPIDR_EL1, .set_user = set_mpidr}, +#else { SYS_DESC(SYS_MPIDR_EL1), NULL, reset_mpidr, MPIDR_EL1 }, +#endif /* * ID regs: all ID_SANITISED() entries here must have corresponding -- 2.33.0