diff options
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s_64.h | 12 | ||||
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rm_mmu.c | 6 |
2 files changed, 15 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h index bf0fa8b0a883..51388befeddb 100644 --- a/arch/powerpc/include/asm/kvm_book3s_64.h +++ b/arch/powerpc/include/asm/kvm_book3s_64.h @@ -289,6 +289,18 @@ static inline void note_hpte_modification(struct kvm *kvm, if (atomic_read(&kvm->arch.hpte_mod_interest)) rev->guest_rpte |= HPTE_GR_MODIFIED; } + +/* + * Like kvm_memslots(), but for use in real mode when we can't do + * any RCU stuff (since the secondary threads are offline from the + * kernel's point of view), and we can't print anything. + * Thus we use rcu_dereference_raw() rather than rcu_dereference_check(). + */ +static inline struct kvm_memslots *kvm_memslots_raw(struct kvm *kvm) +{ + return rcu_dereference_raw_notrace(kvm->memslots); +} + #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ #endif /* __ASM_KVM_BOOK3S_64_H__ */ diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index 37fb3caa4c80..1d6c56ad5b60 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -111,7 +111,7 @@ static void remove_revmap_chain(struct kvm *kvm, long pte_index, rcbits = hpte_r & (HPTE_R_R | HPTE_R_C); ptel = rev->guest_rpte |= rcbits; gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); - memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); + memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); if (!memslot) return; @@ -192,7 +192,7 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, /* Find the memslot (if any) for this address */ gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); gfn = gpa >> PAGE_SHIFT; - memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); + memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); pa = 0; is_io = ~0ul; rmap = NULL; @@ -670,7 +670,7 @@ long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, psize = hpte_page_size(v, r); gfn = ((r & HPTE_R_RPN) & ~(psize - 1)) >> PAGE_SHIFT; - memslot = __gfn_to_memslot(kvm_memslots(kvm), gfn); + memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn); if (memslot) { hva = __gfn_to_hva_memslot(memslot, gfn); pte = lookup_linux_pte_and_update(pgdir, hva, |