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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-04-13 10:04:20 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2017-04-20 04:38:20 +0300 |
| commit | 3762d45aa71d546cc0afa29da2f1cd360c099484 (patch) | |
| tree | 4553f55349a0c76b06e0fc7c9b6d96422836a49e | |
| parent | 96df2267695199b9377bd641c7eb68c393b81b0b (diff) | |
| download | linux-3762d45aa71d546cc0afa29da2f1cd360c099484.tar.xz | |
KVM: PPC: Align the table size to system page size
At the moment the userspace can request a table smaller than a page size
and this value will be stored as kvmppc_spapr_tce_table::size.
However the actual allocated size will still be aligned to the system
page size as alloc_page() is used there.
This aligns the table size up to the system page size. It should not
change the existing behaviour but when in-kernel TCE acceleration patchset
reaches the upstream kernel, this will allow small TCE tables be
accelerated as well: PCI IODA iommu_table allocator already aligns
the size and, without this patch, an IOMMU group won't attach to LIOBN
due to the mismatching table size.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_vio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index 3e26cd4979f9..ab20a47a8821 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -164,7 +164,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, return -EBUSY; } - size = args->size; + size = _ALIGN_UP(args->size, PAGE_SIZE >> 3); npages = kvmppc_tce_pages(size); ret = kvmppc_account_memlimit(kvmppc_stt_pages(npages), true); if (ret) { |