diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rm_mmu.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rm_mmu.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index c086eb0fa99..3f5b016490d 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -65,6 +65,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, unsigned long g_ptel = ptel; struct kvm_memory_slot *memslot; unsigned long *physp, pte_size; + unsigned long is_io; bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; psize = hpte_page_size(pteh, ptel); @@ -92,6 +93,7 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, pa = *physp; if (!pa) return H_TOO_HARD; + is_io = pa & (HPTE_R_I | HPTE_R_W); pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); pa &= PAGE_MASK; @@ -104,9 +106,16 @@ long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, ptel |= pa; /* Check WIMG */ - if ((ptel & HPTE_R_WIMG) != HPTE_R_M && - (ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M)) - return H_PARAMETER; + if (!hpte_cache_flags_ok(ptel, is_io)) { + if (is_io) + return H_PARAMETER; + /* + * Allow guest to map emulated device memory as + * uncacheable, but actually make it cacheable. + */ + ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); + ptel |= HPTE_R_M; + } pteh &= ~0x60UL; pteh |= HPTE_V_VALID; |