diff options
author | Dmitry Shmidt <dimitrysh@google.com> | 2016-10-21 13:40:45 -0700 |
---|---|---|
committer | Dmitry Shmidt <dimitrysh@google.com> | 2016-10-21 13:40:45 -0700 |
commit | b8fa4a3ee5972568ce10d8b23cc314b773381002 (patch) | |
tree | 5eaf89932e71fd9f61fbb4341ce8a35b480986ec /arch/mips | |
parent | b2faab1e4d852d9088893a4d88f8fe3d069f38ee (diff) | |
parent | 4ad454918b1a7e4cccb373d3b1034052c49f6105 (diff) |
Merge tag 'v4.4.26' into android-4.4.y
This is the 4.4.26 stable release
Diffstat (limited to 'arch/mips')
-rw-r--r-- | arch/mips/kvm/emulate.c | 63 |
1 files changed, 53 insertions, 10 deletions
diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index d6476d11212e..3251b206e55a 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -807,6 +807,47 @@ enum emulation_result kvm_mips_emul_tlbr(struct kvm_vcpu *vcpu) return EMULATE_FAIL; } +/** + * kvm_mips_invalidate_guest_tlb() - Indicates a change in guest MMU map. + * @vcpu: VCPU with changed mappings. + * @tlb: TLB entry being removed. + * + * This is called to indicate a single change in guest MMU mappings, so that we + * can arrange TLB flushes on this and other CPUs. + */ +static void kvm_mips_invalidate_guest_tlb(struct kvm_vcpu *vcpu, + struct kvm_mips_tlb *tlb) +{ + int cpu, i; + bool user; + + /* No need to flush for entries which are already invalid */ + if (!((tlb->tlb_lo[0] | tlb->tlb_lo[1]) & ENTRYLO_V)) + return; + /* User address space doesn't need flushing for KSeg2/3 changes */ + user = tlb->tlb_hi < KVM_GUEST_KSEG0; + + preempt_disable(); + + /* + * Probe the shadow host TLB for the entry being overwritten, if one + * matches, invalidate it + */ + kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); + + /* Invalidate the whole ASID on other CPUs */ + cpu = smp_processor_id(); + for_each_possible_cpu(i) { + if (i == cpu) + continue; + if (user) + vcpu->arch.guest_user_asid[i] = 0; + vcpu->arch.guest_kernel_asid[i] = 0; + } + + preempt_enable(); +} + /* Write Guest TLB Entry @ Index */ enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) { @@ -826,11 +867,8 @@ enum emulation_result kvm_mips_emul_tlbwi(struct kvm_vcpu *vcpu) } tlb = &vcpu->arch.guest_tlb[index]; - /* - * Probe the shadow host TLB for the entry being overwritten, if one - * matches, invalidate it - */ - kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); + + kvm_mips_invalidate_guest_tlb(vcpu, tlb); tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); @@ -859,11 +897,7 @@ enum emulation_result kvm_mips_emul_tlbwr(struct kvm_vcpu *vcpu) tlb = &vcpu->arch.guest_tlb[index]; - /* - * Probe the shadow host TLB for the entry being overwritten, if one - * matches, invalidate it - */ - kvm_mips_host_tlb_inv(vcpu, tlb->tlb_hi); + kvm_mips_invalidate_guest_tlb(vcpu, tlb); tlb->tlb_mask = kvm_read_c0_guest_pagemask(cop0); tlb->tlb_hi = kvm_read_c0_guest_entryhi(cop0); @@ -982,6 +1016,7 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, int32_t rt, rd, copz, sel, co_bit, op; uint32_t pc = vcpu->arch.pc; unsigned long curr_pc; + int cpu, i; /* * Update PC and hold onto current PC in case there is @@ -1089,8 +1124,16 @@ enum emulation_result kvm_mips_emulate_CP0(uint32_t inst, uint32_t *opc, vcpu->arch.gprs[rt] & ASID_MASK); + preempt_disable(); /* Blow away the shadow host TLBs */ kvm_mips_flush_host_tlb(1); + cpu = smp_processor_id(); + for_each_possible_cpu(i) + if (i != cpu) { + vcpu->arch.guest_user_asid[i] = 0; + vcpu->arch.guest_kernel_asid[i] = 0; + } + preempt_enable(); } kvm_write_c0_guest_entryhi(cop0, vcpu->arch.gprs[rt]); |