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KVM: PPC: Add support for 64bit TCE windows

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The existing KVM_CREATE_SPAPR_TCE only supports 32bit windows which is not
enough for directly mapped windows as the guest can get more than 4GB.

This adds KVM_CREATE_SPAPR_TCE_64 ioctl and advertises it
via KVM_CAP_SPAPR_TCE_64 capability. The table size is checked against
the locked memory limit.

Since 64bit windows are to support Dynamic DMA windows (DDW), let's add
@bus_offset and @page_shift which are also required by DDW.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Alexey Kardashevskiy
2016-03-01 17:54:40 +11:00
committed by Paul Mackerras
parent 14f853f1b2
commit 58ded4201f
6 changed files with 75 additions and 5 deletions
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32
Documentation/virtual/kvm/api.txt
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@@ -3060,6 +3060,38 @@ an implementation for these despite the in kernel acceleration.
This capability is always enabled.
4.98 KVM_CREATE_SPAPR_TCE_64
Capability: KVM_CAP_SPAPR_TCE_64
Architectures: powerpc
Type: vm ioctl
Parameters: struct kvm_create_spapr_tce_64 (in)
Returns: file descriptor for manipulating the created TCE table
This is an extension for KVM_CAP_SPAPR_TCE which only supports 32bit
windows, described in 4.62 KVM_CREATE_SPAPR_TCE
This capability uses extended struct in ioctl interface:
/* for KVM_CAP_SPAPR_TCE_64 */
struct kvm_create_spapr_tce_64 {
__u64 liobn;
__u32 page_shift;
__u32 flags;
__u64 offset; /* in pages */
__u64 size; /* in pages */
};
The aim of extension is to support an additional bigger DMA window with
a variable page size.
KVM_CREATE_SPAPR_TCE_64 receives a 64bit window size, an IOMMU page shift and
a bus offset of the corresponding DMA window, @size and @offset are numbers
of IOMMU pages.
@flags are not used at the moment.
The rest of functionality is identical to KVM_CREATE_SPAPR_TCE.
5. The kvm_run structure
------------------------