virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBPH85 ------------------------------------------------------------------------ IPIV optimizes unicast scenarios and does not support multicast or broadcast. To prevent GuestOS from generating multicast and broadcast, the MPIDR of vCPUs is modified to ensure that the [aff3, aff2, aff1] fields are uniquely assigned for each vCPU within a virtual machine, while all aff0 fields are set to zero. This configuration guarantees the uniqueness of vCPU affinity identifiers at the architecture level, thereby suppressing the generation of SGI multicast and broadcast signals by the GuestOS. Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com> --- arch/arm64/kvm/sys_regs.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 0cfa8d93e2ee..6a3dddaddd94 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -711,6 +711,8 @@ static u64 reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) return actlr; } +extern struct static_key_false ipiv_enable; + static u64 reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) { u64 mpidr; @@ -725,6 +727,15 @@ static u64 reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r) mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(0); mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(1); mpidr |= ((vcpu->vcpu_id >> 12) & 0xff) << MPIDR_LEVEL_SHIFT(2); + + if (static_branch_unlikely(&ipiv_enable)) { + /* + * To avoid sending multi-SGIs in guest OS, make aff1/aff2 unique + */ + mpidr = (vcpu->vcpu_id & 0x0f) << MPIDR_LEVEL_SHIFT(1); + mpidr |= ((vcpu->vcpu_id >> 4) & 0xff) << MPIDR_LEVEL_SHIFT(2); + } + mpidr |= (1ULL << 31); vcpu_write_sys_reg(vcpu, mpidr, MPIDR_EL1); -- 2.33.0