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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2014-05-27 15:36:30 +1000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:39 +0200 |
| commit | da95324ebe462b14a3507af02eb4a689c8a1619f (patch) | |
| tree | 246278f453437fa1e744a1c02869710006554c74 /target-ppc/kvm.c | |
| parent | a1d59c0ffadf17d546f53f4bda06e8adcf616ede (diff) | |
| download | qemu-da95324ebe462b14a3507af02eb4a689c8a1619f.zip | |
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 <aik@ozlabs.ru>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/kvm.c')
| -rw-r--r-- | target-ppc/kvm.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 05952d09e7..2b2e35f22f 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 = { |