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KVM: PPC: Book3S: Allow backing bigger guest IOMMU pages with smaller physical pages

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At the moment we only support in the host the IOMMU page sizes which
the guest is aware of, which is 4KB/64KB/16MB. However P9 does not support
16MB IOMMU pages, 2MB and 1GB pages are supported instead. We can still
emulate bigger guest pages (for example 16MB) with smaller host pages
(4KB/64KB/2MB).

This allows the physical IOMMU pages to use a page size smaller or equal
than the guest visible IOMMU page size.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Alexey Kardashevskiy 2018-05-14 20:00:28 +10:00 committed by Paul Mackerras
parent c6b61661d2
commit ca1fc489cf
2 changed files with 94 additions and 20 deletions
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64
arch/powerpc/kvm/book3s_64_vio.c
View file

@ -176,14 +176,12 @@ extern long kvm_spapr_tce_attach_iommu_group(struct kvm *kvm, int tablefd,
if (!tbltmp)
continue;
/*
* Make sure hardware table parameters are exactly the same;
* this is used in the TCE handlers where boundary checks
* use only the first attached table.
*/
if ((tbltmp->it_page_shift == stt->page_shift) &&
(tbltmp->it_offset == stt->offset) &&
(tbltmp->it_size == stt->size)) {
/* Make sure hardware table parameters are compatible */
if ((tbltmp->it_page_shift <= stt->page_shift) &&
(tbltmp->it_offset << tbltmp->it_page_shift ==
stt->offset << stt->page_shift) &&
(tbltmp->it_size << tbltmp->it_page_shift ==
stt->size << stt->page_shift)) {
/*
* Reference the table to avoid races with
* add/remove DMA windows.
@ -396,7 +394,7 @@ static long kvmppc_tce_iommu_mapped_dec(struct kvm *kvm,
return H_SUCCESS;
}
static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
static long kvmppc_tce_iommu_do_unmap(struct kvm *kvm,
struct iommu_table *tbl, unsigned long entry)
{
enum dma_data_direction dir = DMA_NONE;
@ -416,7 +414,24 @@ static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
return ret;
}
long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
unsigned long entry)
{
unsigned long i, ret = H_SUCCESS;
unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
unsigned long io_entry = entry * subpages;
for (i = 0; i < subpages; ++i) {
ret = kvmppc_tce_iommu_do_unmap(kvm, tbl, io_entry + i);
if (ret != H_SUCCESS)
break;
}
return ret;
}
long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
unsigned long entry, unsigned long ua,
enum dma_data_direction dir)
{
@ -453,6 +468,27 @@ long kvmppc_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
return 0;
}
static long kvmppc_tce_iommu_map(struct kvm *kvm,
struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
unsigned long entry, unsigned long ua,
enum dma_data_direction dir)
{
unsigned long i, pgoff, ret = H_SUCCESS;
unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
unsigned long io_entry = entry * subpages;
for (i = 0, pgoff = 0; i < subpages;
++i, pgoff += IOMMU_PAGE_SIZE(tbl)) {
ret = kvmppc_tce_iommu_do_map(kvm, tbl,
io_entry + i, ua + pgoff, dir);
if (ret != H_SUCCESS)
break;
}
return ret;
}
long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
unsigned long ioba, unsigned long tce)
{
@ -491,10 +527,10 @@ long kvmppc_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
if (dir == DMA_NONE)
ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt,
stit->tbl, entry);
else
ret = kvmppc_tce_iommu_map(vcpu->kvm, stit->tbl,
ret = kvmppc_tce_iommu_map(vcpu->kvm, stt, stit->tbl,
entry, ua, dir);
if (ret == H_SUCCESS)
@ -570,7 +606,7 @@ long kvmppc_h_put_tce_indirect(struct kvm_vcpu *vcpu,
return H_PARAMETER;
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
ret = kvmppc_tce_iommu_map(vcpu->kvm,
ret = kvmppc_tce_iommu_map(vcpu->kvm, stt,
stit->tbl, entry + i, ua,
iommu_tce_direction(tce));
@ -618,7 +654,7 @@ long kvmppc_h_stuff_tce(struct kvm_vcpu *vcpu,
unsigned long entry = ioba >> stt->page_shift;
for (i = 0; i < npages; ++i) {
ret = kvmppc_tce_iommu_unmap(vcpu->kvm,
ret = kvmppc_tce_iommu_unmap(vcpu->kvm, stt,
stit->tbl, entry + i);
if (ret == H_SUCCESS)

50
arch/powerpc/kvm/book3s_64_vio_hv.c
View file

@ -221,7 +221,7 @@ static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm,
return H_SUCCESS;
}
static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm,
static long kvmppc_rm_tce_iommu_do_unmap(struct kvm *kvm,
struct iommu_table *tbl, unsigned long entry)
{
enum dma_data_direction dir = DMA_NONE;
@ -245,7 +245,24 @@ static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm,
return ret;
}
static long kvmppc_rm_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm,
struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
unsigned long entry)
{
unsigned long i, ret = H_SUCCESS;
unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
unsigned long io_entry = entry * subpages;
for (i = 0; i < subpages; ++i) {
ret = kvmppc_rm_tce_iommu_do_unmap(kvm, tbl, io_entry + i);
if (ret != H_SUCCESS)
break;
}
return ret;
}
static long kvmppc_rm_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
unsigned long entry, unsigned long ua,
enum dma_data_direction dir)
{
@ -290,6 +307,27 @@ static long kvmppc_rm_tce_iommu_map(struct kvm *kvm, struct iommu_table *tbl,
return 0;
}
static long kvmppc_rm_tce_iommu_map(struct kvm *kvm,
struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
unsigned long entry, unsigned long ua,
enum dma_data_direction dir)
{
unsigned long i, pgoff, ret = H_SUCCESS;
unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
unsigned long io_entry = entry * subpages;
for (i = 0, pgoff = 0; i < subpages;
++i, pgoff += IOMMU_PAGE_SIZE(tbl)) {
ret = kvmppc_rm_tce_iommu_do_map(kvm, tbl,
io_entry + i, ua + pgoff, dir);
if (ret != H_SUCCESS)
break;
}
return ret;
}
long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
unsigned long ioba, unsigned long tce)
{
@ -327,10 +365,10 @@ long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
if (dir == DMA_NONE)
ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm,
ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt,
stit->tbl, entry);
else
ret = kvmppc_rm_tce_iommu_map(vcpu->kvm,
ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
stit->tbl, entry, ua, dir);
if (ret == H_SUCCESS)
@ -477,7 +515,7 @@ long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
return H_PARAMETER;
list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
ret = kvmppc_rm_tce_iommu_map(vcpu->kvm,
ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
stit->tbl, entry + i, ua,
iommu_tce_direction(tce));
@ -529,7 +567,7 @@ long kvmppc_rm_h_stuff_tce(struct kvm_vcpu *vcpu,
unsigned long entry = ioba >> stt->page_shift;
for (i = 0; i < npages; ++i) {
ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm,
ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt,
stit->tbl, entry + i);
if (ret == H_SUCCESS)