On 07/06/2013 05:07 PM, Alexey Kardashevskiy wrote:
This allows the host kernel to handle H_PUT_TCE, H_PUT_TCE_INDIRECT
and H_STUFF_TCE requests without passing them to QEMU, which saves time
on switching to QEMU and back.
Both real and virtual modes are supported. First the kernel tries to
handle a TCE request in the real mode, if failed it passes it to
the virtual mode to complete the operation. If it a virtual mode
handler fails, a request is passed to the user mode.
This adds a new KVM_CAP_SPAPR_TCE_IOMMU ioctl to associate
a virtual PCI bus ID (LIOBN) with an IOMMU group which enables
in-kernel handling of IOMMU map/unmap. The external user API support
in VFIO is required.
Tests show that this patch increases transmission speed from 220MB/s
to 750..1020MB/s on 10Gb network (Chelsea CXGB3 10Gb ethernet card).
Signed-off-by: Paul Mackerras<paulus@xxxxxxxxx>
Signed-off-by: Alexey Kardashevskiy<aik@xxxxxxxxx>
---
Changes:
2013/07/06:
* added realmode arch_spin_lock to protect TCE table from races
in real and virtual modes
* POWERPC IOMMU API is changed to support real mode
* iommu_take_ownership and iommu_release_ownership are protected by
iommu_table's locks
* VFIO external user API use rewritten
* multiple small fixes
2013/06/27:
* tce_list page is referenced now in order to protect it from accident
invalidation during H_PUT_TCE_INDIRECT execution
* added use of the external user VFIO API
2013/06/05:
* changed capability number
* changed ioctl number
* update the doc article number
2013/05/20:
* removed get_user() from real mode handlers
* kvm_vcpu_arch::tce_tmp usage extended. Now real mode handler puts there
translated TCEs, tries realmode_get_page() on those and if it fails, it
passes control over the virtual mode handler which tries to finish
the request handling
* kvmppc_lookup_pte() now does realmode_get_page() protected by BUSY bit
on a page
* The only reason to pass the request to user mode now is when the user mode
did not register TCE table in the kernel, in all other cases the virtual mode
handler is expected to do the job
Signed-off-by: Alexey Kardashevskiy<aik@xxxxxxxxx>
---
Documentation/virtual/kvm/api.txt | 26 ++++
arch/powerpc/include/asm/iommu.h | 9 +-
arch/powerpc/include/asm/kvm_host.h | 3 +
arch/powerpc/include/asm/kvm_ppc.h | 2 +
arch/powerpc/include/uapi/asm/kvm.h | 7 +
arch/powerpc/kernel/iommu.c | 196 +++++++++++++++--------
arch/powerpc/kvm/book3s_64_vio.c | 299 +++++++++++++++++++++++++++++++++++-
arch/powerpc/kvm/book3s_64_vio_hv.c | 129 ++++++++++++++++
arch/powerpc/kvm/powerpc.c | 12 ++
9 files changed, 609 insertions(+), 74 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 762c703..01b0dc2 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2387,6 +2387,32 @@ slows operations a lot.
Unlike other capabilities of this section, this one is always enabled.
+4.87 KVM_CREATE_SPAPR_TCE_IOMMU
+
+Capability: KVM_CAP_SPAPR_TCE_IOMMU
+Architectures: powerpc
+Type: vm ioctl
+Parameters: struct kvm_create_spapr_tce_iommu (in)
+Returns: 0 on success, -1 on error
+
+struct kvm_create_spapr_tce_iommu {
+ __u64 liobn;
+ __u32 iommu_id;
+ __u32 flags;
Your documentation is out of sync.
Please also split this patch up. It's too long for review.
Alex
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