From da95324ebe462b14a3507af02eb4a689c8a1619f Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Tue, 27 May 2014 15:36:30 +1000 Subject: spapr_iommu: Enable multiple TCE requests Currently only single TCE entry per request is supported (H_PUT_TCE). However PAPR+ specification allows multiple entry requests such as H_PUT_TCE_INDIRECT and H_STUFF_TCE. Having less transitions to the host kernel via ioctls, support of these calls can accelerate IOMMU operations. This implements H_STUFF_TCE and H_PUT_TCE_INDIRECT. This advertises "multi-tce" capability to the guest if the host kernel supports it (KVM_CAP_SPAPR_MULTITCE) or guest is running in TCG mode. Signed-off-by: Alexey Kardashevskiy Signed-off-by: Alexander Graf --- target-ppc/kvm.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'target-ppc/kvm.c') diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 05952d0..2b2e35f 100644 --- a/target-ppc/kvm.c +++ b/target-ppc/kvm.c @@ -62,6 +62,7 @@ static int cap_booke_sregs; static int cap_ppc_smt; static int cap_ppc_rma; static int cap_spapr_tce; +static int cap_spapr_multitce; static int cap_hior; static int cap_one_reg; static int cap_epr; @@ -98,6 +99,7 @@ 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_multitce = kvm_check_extension(s, KVM_CAP_SPAPR_MULTITCE); 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); @@ -1613,6 +1615,11 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift) } #endif +bool kvmppc_spapr_use_multitce(void) +{ + return cap_spapr_multitce; +} + void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd) { struct kvm_create_spapr_tce args = { -- cgit v1.1