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KVM: PPC: Book3S: Invalidate multiple TCEs at once
Invalidating a TCE cache entry for each updated TCE is quite expensive. This makes use of the new iommu_table_ops::xchg_no_kill()/tce_kill() callbacks to bring down the time spent in mapping a huge guest DMA window; roughly 20s to 10s for each guest's 100GB of DMA space. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Acked-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190829085252.72370-3-aik@ozlabs.ru
This commit is contained in:
parent
35872480da
commit
01b7d128b5
2 changed files with 48 additions and 19 deletions
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@ -416,7 +416,7 @@ static void kvmppc_clear_tce(struct mm_struct *mm, struct iommu_table *tbl,
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unsigned long hpa = 0;
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enum dma_data_direction dir = DMA_NONE;
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iommu_tce_xchg(mm, tbl, entry, &hpa, &dir);
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iommu_tce_xchg_no_kill(mm, tbl, entry, &hpa, &dir);
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}
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static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
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@ -447,7 +447,8 @@ static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm,
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unsigned long hpa = 0;
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long ret;
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if (WARN_ON_ONCE(iommu_tce_xchg(kvm->mm, tbl, entry, &hpa, &dir)))
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if (WARN_ON_ONCE(iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa,
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&dir)))
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return H_TOO_HARD;
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if (dir == DMA_NONE)
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@ -455,7 +456,7 @@ static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm,
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ret = kvmppc_tce_iommu_mapped_dec(kvm, tbl, entry);
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if (ret != H_SUCCESS)
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iommu_tce_xchg(kvm->mm, tbl, entry, &hpa, &dir);
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iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir);
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return ret;
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}
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@ -501,7 +502,7 @@ long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
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if (mm_iommu_mapped_inc(mem))
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return H_TOO_HARD;
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ret = iommu_tce_xchg(kvm->mm, tbl, entry, &hpa, &dir);
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ret = iommu_tce_xchg_no_kill(kvm->mm, tbl, entry, &hpa, &dir);
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if (WARN_ON_ONCE(ret)) {
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mm_iommu_mapped_dec(mem);
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return H_TOO_HARD;
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@ -579,6 +580,8 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
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ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl,
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entry, ua, dir);
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iommu_tce_kill(stit->tbl, entry, 1);
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if (ret != H_SUCCESS) {
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kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry);
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goto unlock_exit;
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@ -656,13 +659,13 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
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*/
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if (get_user(tce, tces + i)) {
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ret = H_TOO_HARD;
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goto unlock_exit;
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goto invalidate_exit;
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}
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tce = be64_to_cpu(tce);
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if (kvmppc_tce_to_ua(vcpu->kvm, tce, &ua)) {
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ret = H_PARAMETER;
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goto unlock_exit;
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goto invalidate_exit;
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}
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list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
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@ -673,13 +676,17 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
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if (ret != H_SUCCESS) {
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kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl,
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entry);
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goto unlock_exit;
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goto invalidate_exit;
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}
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}
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kvmppc_tce_put(stt, entry + i, tce);
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}
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invalidate_exit:
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list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
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iommu_tce_kill(stit->tbl, entry, npages);
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unlock_exit:
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srcu_read_unlock(&vcpu->kvm->srcu, idx);
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@ -718,7 +725,7 @@ long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
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continue;
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if (ret == H_TOO_HARD)
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return ret;
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goto invalidate_exit;
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WARN_ON_ONCE(1);
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kvmppc_clear_tce(vcpu->kvm->mm, stit->tbl, entry);
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@ -728,6 +735,10 @@ long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
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for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
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kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value);
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return H_SUCCESS;
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invalidate_exit:
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list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
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iommu_tce_kill(stit->tbl, ioba >> stt->page_shift, npages);
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return ret;
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}
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EXPORT_SYMBOL_GPL(kvmppc_h_stuff_tce);
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@ -218,13 +218,14 @@ static long kvmppc_rm_ioba_validate(struct kvmppc_spapr_tce_table *stt,
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return H_SUCCESS;
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}
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static long iommu_tce_xchg_rm(struct mm_struct *mm, struct iommu_table *tbl,
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static long iommu_tce_xchg_no_kill_rm(struct mm_struct *mm,
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struct iommu_table *tbl,
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unsigned long entry, unsigned long *hpa,
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enum dma_data_direction *direction)
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{
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long ret;
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ret = tbl->it_ops->exchange_rm(tbl, entry, hpa, direction);
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ret = tbl->it_ops->xchg_no_kill(tbl, entry, hpa, direction, true);
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if (!ret && ((*direction == DMA_FROM_DEVICE) ||
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(*direction == DMA_BIDIRECTIONAL))) {
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@ -240,13 +241,20 @@ static long iommu_tce_xchg_rm(struct mm_struct *mm, struct iommu_table *tbl,
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return ret;
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}
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extern void iommu_tce_kill_rm(struct iommu_table *tbl,
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unsigned long entry, unsigned long pages)
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{
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if (tbl->it_ops->tce_kill)
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tbl->it_ops->tce_kill(tbl, entry, pages, true);
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}
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static void kvmppc_rm_clear_tce(struct kvm *kvm, struct iommu_table *tbl,
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unsigned long entry)
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{
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unsigned long hpa = 0;
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enum dma_data_direction dir = DMA_NONE;
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iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir);
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iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir);
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}
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static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm,
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@ -278,7 +286,7 @@ static long kvmppc_rm_tce_iommu_do_unmap(struct kvm *kvm,
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unsigned long hpa = 0;
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long ret;
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if (iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir))
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if (iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir))
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/*
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* real mode xchg can fail if struct page crosses
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* a page boundary
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@ -290,7 +298,7 @@ static long kvmppc_rm_tce_iommu_do_unmap(struct kvm *kvm,
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ret = kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
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if (ret)
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iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir);
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iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir);
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return ret;
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}
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@ -336,7 +344,7 @@ static long kvmppc_rm_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
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if (WARN_ON_ONCE_RM(mm_iommu_mapped_inc(mem)))
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return H_TOO_HARD;
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ret = iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir);
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ret = iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir);
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if (ret) {
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mm_iommu_mapped_dec(mem);
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/*
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@ -417,6 +425,8 @@ long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
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ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
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stit->tbl, entry, ua, dir);
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iommu_tce_kill_rm(stit->tbl, entry, 1);
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if (ret != H_SUCCESS) {
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kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl, entry);
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return ret;
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@ -558,7 +568,7 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
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ua = 0;
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if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce, &ua, NULL)) {
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ret = H_PARAMETER;
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goto unlock_exit;
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goto invalidate_exit;
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}
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list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
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if (ret != H_SUCCESS) {
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kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl,
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entry);
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goto unlock_exit;
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goto invalidate_exit;
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}
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}
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kvmppc_rm_tce_put(stt, entry + i, tce);
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}
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invalidate_exit:
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list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
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iommu_tce_kill_rm(stit->tbl, entry, npages);
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unlock_exit:
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if (rmap)
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unlock_rmap(rmap);
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continue;
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if (ret == H_TOO_HARD)
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return ret;
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goto invalidate_exit;
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WARN_ON_ONCE_RM(1);
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kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl, entry);
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for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
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kvmppc_rm_tce_put(stt, ioba >> stt->page_shift, tce_value);
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return H_SUCCESS;
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invalidate_exit:
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list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
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iommu_tce_kill_rm(stit->tbl, ioba >> stt->page_shift, npages);
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return ret;
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}
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/* This can be called in either virtual mode or real mode */
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