diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/tlb.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/tlb.c | 38 |
1 files changed, 29 insertions, 9 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/tlb.c b/arch/arm64/kvm/hyp/nvhe/tlb.c index d296d617f589..978179133f4b 100644 --- a/arch/arm64/kvm/hyp/nvhe/tlb.c +++ b/arch/arm64/kvm/hyp/nvhe/tlb.c @@ -15,8 +15,31 @@ struct tlb_inv_context { }; static void __tlb_switch_to_guest(struct kvm_s2_mmu *mmu, - struct tlb_inv_context *cxt) + struct tlb_inv_context *cxt, + bool nsh) { + /* + * We have two requirements: + * + * - ensure that the page table updates are visible to all + * CPUs, for which a dsb(DOMAIN-st) is what we need, DOMAIN + * being either ish or nsh, depending on the invalidation + * type. + * + * - complete any speculative page table walk started before + * we trapped to EL2 so that we can mess with the MM + * registers out of context, for which dsb(nsh) is enough + * + * The composition of these two barriers is a dsb(DOMAIN), and + * the 'nsh' parameter tracks the distinction between + * Inner-Shareable and Non-Shareable, as specified by the + * callers. + */ + if (nsh) + dsb(nsh); + else + dsb(ish); + if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) { u64 val; @@ -60,10 +83,8 @@ void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, { struct tlb_inv_context cxt; - dsb(ishst); - /* Switch to requested VMID */ - __tlb_switch_to_guest(mmu, &cxt); + __tlb_switch_to_guest(mmu, &cxt, false); /* * We could do so much better if we had the VA as well. @@ -113,10 +134,8 @@ void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu) { struct tlb_inv_context cxt; - dsb(ishst); - /* Switch to requested VMID */ - __tlb_switch_to_guest(mmu, &cxt); + __tlb_switch_to_guest(mmu, &cxt, false); __tlbi(vmalls12e1is); dsb(ish); @@ -130,7 +149,7 @@ void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu) struct tlb_inv_context cxt; /* Switch to requested VMID */ - __tlb_switch_to_guest(mmu, &cxt); + __tlb_switch_to_guest(mmu, &cxt, false); __tlbi(vmalle1); asm volatile("ic iallu"); @@ -142,7 +161,8 @@ void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu) void __kvm_flush_vm_context(void) { - dsb(ishst); + /* Same remark as in __tlb_switch_to_guest() */ + dsb(ish); __tlbi(alle1is); /* |