This enables in-kernel support for DMA operations on VFIO PHBs. This creates a "SPAPR TCE IOMMU" KVM device and initializes it with LIOBN and IOMMU fd. Once enabled, it keeps H_PUT_TCE, H_PUT_TCE_INDIRECT, H_STUFF_TCE hypercalls in the kernel so their QEMU handlers won't be called.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru> --- hw/ppc/spapr_iommu.c | 4 ++++ target-ppc/kvm.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ target-ppc/kvm_ppc.h | 13 +++++++++++++ 3 files changed, 64 insertions(+) diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c index d91dee5..32255fc 100644 --- a/hw/ppc/spapr_iommu.c +++ b/hw/ppc/spapr_iommu.c @@ -258,6 +258,7 @@ sPAPRTCETable *spapr_vfio_new_table(DeviceState *owner, uint32_t liobn, int group_fd) { sPAPRTCETable *tcet; + int fd; if (spapr_tce_find_by_liobn(liobn)) { fprintf(stderr, "Attempted to create TCE table with duplicate" @@ -265,8 +266,11 @@ sPAPRTCETable *spapr_vfio_new_table(DeviceState *owner, uint32_t liobn, return NULL; } + fd = kvmppc_create_spapr_tce_iommu(liobn, group_fd); + tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE_VFIO)); tcet->liobn = liobn; + tcet->fd = fd; object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL); object_property_set_bool(OBJECT(tcet), true, "realized", NULL); diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 5e72c22..ec7556f 100644 --- a/target-ppc/kvm.c +++ b/target-ppc/kvm.c @@ -60,6 +60,7 @@ static int cap_booke_sregs; static int cap_ppc_smt; static int cap_ppc_rma; static int cap_spapr_tce; +static int cap_spapr_tce_iommu; static int cap_hior; static int cap_one_reg; static int cap_epr; @@ -96,6 +97,7 @@ int kvm_arch_init(KVMState *s) cap_ppc_smt = kvm_check_extension(s, KVM_CAP_PPC_SMT); cap_ppc_rma = kvm_check_extension(s, KVM_CAP_PPC_RMA); cap_spapr_tce = kvm_check_extension(s, KVM_CAP_SPAPR_TCE); + cap_spapr_tce_iommu = kvm_check_extension(s, KVM_CAP_SPAPR_TCE_IOMMU); cap_one_reg = kvm_check_extension(s, KVM_CAP_ONE_REG); cap_hior = kvm_check_extension(s, KVM_CAP_PPC_HIOR); cap_epr = kvm_check_extension(s, KVM_CAP_PPC_EPR); @@ -1662,6 +1664,51 @@ int kvmppc_remove_spapr_tce(void *table, int fd, uint32_t window_size) return 0; } +int kvmppc_create_spapr_tce_iommu(uint32_t liobn, int group_fd) +{ + int rc; + struct kvm_create_spapr_tce_iommu_linkage args = { + .liobn = liobn, + .fd = group_fd + }; + struct kvm_device_attr attr = { + .flags = 0, + .group = KVM_DEV_SPAPR_TCE_IOMMU_ATTR_LINKAGE, + .addr = (uint64_t)(uintptr_t)&args, + }; + struct kvm_create_device kcd = { + .type = KVM_DEV_TYPE_SPAPR_TCE_IOMMU, + .flags = 0, + }; + + if (!kvm_enabled() || !cap_spapr_tce_iommu) { + fprintf(stderr, "KVM VFIO: TCE IOMMU capability is not present, DMA may be slow\n"); + return -1; + } + + rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &kcd); + if (rc < 0) { + fprintf(stderr, "Error on KVM_CREATE_DEVICE for SPAPR TCE IOMMU\n"); + return rc; + } + rc = ioctl(kcd.fd, KVM_SET_DEVICE_ATTR, &attr); + if (rc < 0) { + fprintf(stderr, "KVM VFIO: Failed to create TCE table for liobn 0x%x, ret = %d, DMA may be slow\n", + liobn, rc); + } + + return kcd.fd; +} + +int kvmppc_remove_spapr_tce_iommu(int fd) +{ + if (fd < 0) { + return -1; + } + + return close(fd); +} + int kvmppc_reset_htab(int shift_hint) { uint32_t shift = shift_hint; diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h index 5f78e4b..35d3325 100644 --- a/target-ppc/kvm_ppc.h +++ b/target-ppc/kvm_ppc.h @@ -33,6 +33,8 @@ int kvmppc_booke_watchdog_enable(PowerPCCPU *cpu); off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem); void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd); int kvmppc_remove_spapr_tce(void *table, int pfd, uint32_t window_size); +int kvmppc_create_spapr_tce_iommu(uint32_t liobn, int group_fd); +int kvmppc_remove_spapr_tce_iommu(int fd); int kvmppc_reset_htab(int shift_hint); uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift); #endif /* !CONFIG_USER_ONLY */ @@ -137,6 +139,17 @@ static inline int kvmppc_remove_spapr_tce(void *table, int pfd, return -1; } +static inline int kvmppc_create_spapr_tce_iommu(uint32_t liobn, + uint32_t iommu_id) +{ + return -1; +} + +static inline int kvmppc_remove_spapr_tce_iommu(int fd) +{ + return -1; +} + static inline int kvmppc_reset_htab(int shift_hint) { return -1; -- 1.8.4.rc4