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s390x/pci: fixup global refresh

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The VFIO common code doesn't provide the possibility to modify a
previous mapping entry in another way than unmapping and mapping again
with new properties.

To avoid -EEXIST DMA mapping error, we introduce a GHashTable to store
S390IOTLBEntry instances in order to cache the mapped entries. When
intercepting rpcit instruction, ignore the identical mapped entries to
avoid doing map operations multiple times and do unmap and re-map
operations for the case of updating the valid entries.

Acked-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Message-Id: <20180205072258.5968-3-zyimin@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Yi Min Zhao 2018-02-05 15:22:57 +08:00 committed by Cornelia Huck
parent 0125861eac
commit b3f05d8c7f
3 changed files with 64 additions and 16 deletions
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24
hw/s390x/s390-pci-bus.c
View File

@ -487,7 +487,8 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
IOMMUAccessFlags flag)
{
S390PCIIOMMU *iommu = container_of(mr, S390PCIIOMMU, iommu_mr);
S390IOTLBEntry entry;
S390IOTLBEntry *entry;
uint64_t iova = addr & PAGE_MASK;
uint16_t error = 0;
IOMMUTLBEntry ret = {
.target_as = &address_space_memory,
@ -515,12 +516,17 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
goto err;
}
error = s390_guest_io_table_walk(iommu->g_iota, addr, &entry);
ret.iova = entry.iova;
ret.translated_addr = entry.translated_addr;
ret.addr_mask = entry.len - 1;
ret.perm = entry.perm;
entry = g_hash_table_lookup(iommu->iotlb, &iova);
if (entry) {
ret.iova = entry->iova;
ret.translated_addr = entry->translated_addr;
ret.addr_mask = entry->len - 1;
ret.perm = entry->perm;
} else {
ret.iova = iova;
ret.addr_mask = ~PAGE_MASK;
ret.perm = IOMMU_NONE;
}
if (flag != IOMMU_NONE && !(flag & ret.perm)) {
error = ERR_EVENT_TPROTE;
@ -572,6 +578,8 @@ static S390PCIIOMMU *s390_pci_get_iommu(S390pciState *s, PCIBus *bus,
PCI_FUNC(devfn));
memory_region_init(&iommu->mr, OBJECT(iommu), mr_name, UINT64_MAX);
address_space_init(&iommu->as, &iommu->mr, as_name);
iommu->iotlb = g_hash_table_new_full(g_int64_hash, g_int64_equal,
NULL, g_free);
table->iommu[PCI_SLOT(devfn)] = iommu;
g_free(mr_name);
@ -661,6 +669,7 @@ void s390_pci_iommu_enable(S390PCIIOMMU *iommu)
void s390_pci_iommu_disable(S390PCIIOMMU *iommu)
{
iommu->enabled = false;
g_hash_table_remove_all(iommu->iotlb);
memory_region_del_subregion(&iommu->mr, MEMORY_REGION(&iommu->iommu_mr));
object_unparent(OBJECT(&iommu->iommu_mr));
}
@ -676,6 +685,7 @@ static void s390_pci_iommu_free(S390pciState *s, PCIBus *bus, int32_t devfn)
}
table->iommu[PCI_SLOT(devfn)] = NULL;
g_hash_table_destroy(iommu->iotlb);
address_space_destroy(&iommu->as);
object_unparent(OBJECT(&iommu->mr));
object_unparent(OBJECT(iommu));

1
hw/s390x/s390-pci-bus.h
View File

@ -278,6 +278,7 @@ typedef struct S390PCIIOMMU {
uint64_t g_iota;
uint64_t pba;
uint64_t pal;
GHashTable *iotlb;
} S390PCIIOMMU;
typedef struct S390PCIIOMMUTable {

55
hw/s390x/s390-pci-inst.c
View File

@ -571,6 +571,45 @@ int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
return 0;
}
static void s390_pci_update_iotlb(S390PCIIOMMU *iommu, S390IOTLBEntry *entry)
{
S390IOTLBEntry *cache = g_hash_table_lookup(iommu->iotlb, &entry->iova);
IOMMUTLBEntry notify = {
.target_as = &address_space_memory,
.iova = entry->iova,
.translated_addr = entry->translated_addr,
.perm = entry->perm,
.addr_mask = ~PAGE_MASK,
};
if (entry->perm == IOMMU_NONE) {
if (!cache) {
return;
}
g_hash_table_remove(iommu->iotlb, &entry->iova);
} else {
if (cache) {
if (cache->perm == entry->perm &&
cache->translated_addr == entry->translated_addr) {
return;
}
notify.perm = IOMMU_NONE;
memory_region_notify_iommu(&iommu->iommu_mr, notify);
notify.perm = entry->perm;
}
cache = g_new(S390IOTLBEntry, 1);
cache->iova = entry->iova;
cache->translated_addr = entry->translated_addr;
cache->len = PAGE_SIZE;
cache->perm = entry->perm;
g_hash_table_replace(iommu->iotlb, &cache->iova, cache);
}
memory_region_notify_iommu(&iommu->iommu_mr, notify);
}
int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
{
CPUS390XState *env = &cpu->env;
@ -580,7 +619,6 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
S390PCIIOMMU *iommu;
S390IOTLBEntry entry;
hwaddr start, end;
IOMMUTLBEntry notify;
cpu_synchronize_state(CPU(cpu));
@ -636,15 +674,14 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
if (error) {
break;
}
notify.target_as = &address_space_memory;
notify.iova = entry.iova;
notify.translated_addr = entry.translated_addr;
notify.addr_mask = entry.len - 1;
notify.perm = entry.perm;
memory_region_notify_iommu(&iommu->iommu_mr, notify);
start += entry.len;
}
start += entry.len;
while (entry.iova < start && entry.iova < end) {
s390_pci_update_iotlb(iommu, &entry);
entry.iova += PAGE_SIZE;
entry.translated_addr += PAGE_SIZE;
}
}
err:
if (error) {
pbdev->state = ZPCI_FS_ERROR;