This uses new kernel KVM_CAP_SPAPR_TCE_VFIO capability to enable in-kernel acceleration of TCE update requests which will go via the VFIO KVM device.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru> Reviewed-by: David Gibson <da...@gibson.dropbear.id.au> --- target/ppc/kvm_ppc.h | 6 ++++++ hw/ppc/spapr_iommu.c | 4 ++++ target/ppc/kvm.c | 7 ++++++- 3 files changed, 16 insertions(+), 1 deletion(-) diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h index 6bc6fb3e2d..96936ec50f 100644 --- a/target/ppc/kvm_ppc.h +++ b/target/ppc/kvm_ppc.h @@ -46,6 +46,7 @@ void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t page_shift, int kvmppc_remove_spapr_tce(void *table, int pfd, uint32_t window_size); int kvmppc_reset_htab(int shift_hint); uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift); +bool kvmppc_has_cap_spapr_vfio(void); #endif /* !CONFIG_USER_ONLY */ bool kvmppc_has_cap_epr(void); int kvmppc_define_rtas_kernel_token(uint32_t token, const char *function); @@ -220,6 +221,11 @@ static inline bool kvmppc_is_mem_backend_page_size_ok(const char *obj_path) return true; } +static inline bool kvmppc_has_cap_spapr_vfio(void) +{ + return false; +} + #endif /* !CONFIG_USER_ONLY */ static inline bool kvmppc_has_cap_epr(void) diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c index 82fca61a75..3b4c1f50f4 100644 --- a/hw/ppc/spapr_iommu.c +++ b/hw/ppc/spapr_iommu.c @@ -289,6 +289,10 @@ void spapr_tce_set_need_vfio(sPAPRTCETable *tcet, bool need_vfio) tcet->need_vfio = need_vfio; + if (!need_vfio || (tcet->fd != -1 && kvmppc_has_cap_spapr_vfio())) { + return; + } + oldtable = tcet->table; tcet->table = spapr_tce_alloc_table(tcet->liobn, diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index 85713795de..413ce84509 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -134,7 +134,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) cap_spapr_tce = kvm_check_extension(s, KVM_CAP_SPAPR_TCE); cap_spapr_tce_64 = kvm_check_extension(s, KVM_CAP_SPAPR_TCE_64); cap_spapr_multitce = kvm_check_extension(s, KVM_CAP_SPAPR_MULTITCE); - cap_spapr_vfio = false; + cap_spapr_vfio = kvm_check_extension(s, KVM_CAP_SPAPR_TCE_VFIO); 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); @@ -2428,6 +2428,11 @@ bool kvmppc_has_cap_mmu_hash_v3(void) return cap_mmu_hash_v3; } +bool kvmppc_has_cap_spapr_vfio(void) +{ + return cap_spapr_vfio; +} + PowerPCCPUClass *kvm_ppc_get_host_cpu_class(void) { uint32_t host_pvr = mfpvr(); -- 2.11.0