From 91e4f1b6073dd680d86cdb7e42d7cccca9db39d8 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Thu, 15 Sep 2016 17:20:06 +0100 Subject: [PATCH] KVM: MIPS: Drop other CPU ASIDs on guest MMU changes MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When a guest TLB entry is replaced by TLBWI or TLBWR, we only invalidate TLB entries on the local CPU. This doesn't work correctly on an SMP host when the guest is migrated to a different physical CPU, as it could pick up stale TLB mappings from the last time the vCPU ran on that physical CPU. Therefore invalidate both user and kernel host ASIDs on other CPUs, which will cause new ASIDs to be generated when it next runs on those CPUs. We're careful only to do this if the TLB entry was already valid, and only for the kernel ASID where the virtual address it mapped is outside of the guest user address range. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Cc: # 3.10.x- --- arch/mips/kvm/emulate.c | 63 ++++++++++++++++++++++++++++++++++------- 1 file changed, 53 insertions(+), 10 deletions(-) diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c index e788515f766b..43853ec6e160 100644 --- a/arch/mips/kvm/emulate.c +++ b/arch/mips/kvm/emulate.c @@ -846,6 +846,47 @@ 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) { @@ -865,11 +906,8 @@ 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); @@ -898,11 +936,7 @@ 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); @@ -1026,6 +1060,7 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst, enum emulation_result er = EMULATE_DONE; u32 rt, rd, sel; unsigned long curr_pc; + int cpu, i; /* * Update PC and hold onto current PC in case there is @@ -1135,8 +1170,16 @@ enum emulation_result kvm_mips_emulate_CP0(union mips_instruction inst, & KVM_ENTRYHI_ASID, nasid); + 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]); -- 2.20.1