diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_vio.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_vio.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index 85cfa6328222..d6589c4fe889 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -32,6 +32,18 @@ #include <asm/tce.h> #include <asm/mmu_context.h> +static struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm *kvm, + unsigned long liobn) +{ + struct kvmppc_spapr_tce_table *stt; + + list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list) + if (stt->liobn == liobn) + return stt; + + return NULL; +} + static unsigned long kvmppc_tce_pages(unsigned long iommu_pages) { return ALIGN(iommu_pages * sizeof(u64), PAGE_SIZE) / PAGE_SIZE; @@ -753,3 +765,34 @@ long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu, return ret; } EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce); + +long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn, + unsigned long ioba) +{ + struct kvmppc_spapr_tce_table *stt; + long ret; + unsigned long idx; + struct page *page; + u64 *tbl; + + stt = kvmppc_find_table(vcpu->kvm, liobn); + if (!stt) + return H_TOO_HARD; + + ret = kvmppc_ioba_validate(stt, ioba, 1); + if (ret != H_SUCCESS) + return ret; + + idx = (ioba >> stt->page_shift) - stt->offset; + page = stt->pages[idx / TCES_PER_PAGE]; + if (!page) { + vcpu->arch.regs.gpr[4] = 0; + return H_SUCCESS; + } + tbl = (u64 *)page_address(page); + + vcpu->arch.regs.gpr[4] = tbl[idx % TCES_PER_PAGE]; + + return H_SUCCESS; +} +EXPORT_SYMBOL_GPL(kvmppc_h_get_tce); |