diff options
| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2018-07-04 16:13:47 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-16 22:53:10 +1000 |
| commit | 090bad39b237aad92d8e01baa033699cf0c81cbe (patch) | |
| tree | e9586d1bdb4a7eaf03714c1d3c7eca391e4235fa /arch/powerpc/kvm | |
| parent | 00a5c58d9499bd0c290b57205f43a70f2e69d3f6 (diff) | |
powerpc/powernv: Add indirect levels to it_userspace
We want to support sparse memory and therefore huge chunks of DMA windows
do not need to be mapped. If a DMA window big enough to require 2 or more
indirect levels, and a DMA window is used to map all RAM (which is
a default case for 64bit window), we can actually save some memory by
not allocation TCE for regions which we are not going to map anyway.
The hardware tables alreary support indirect levels but we also keep
host-physical-to-userspace translation array which is allocated by
vmalloc() and is a flat array which might use quite some memory.
This converts it_userspace from vmalloc'ed array to a multi level table.
As the format becomes platform dependend, this replaces the direct access
to it_usespace with a iommu_table_ops::useraddrptr hook which returns
a pointer to the userspace copy of a TCE; future extension will return
NULL if the level was not allocated.
This should not change non-KVM handling of TCE tables and it_userspace
will not be allocated for non-KVM tables.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_vio_hv.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c index 236f74b210a7..ee98cf6180d7 100644 --- a/arch/powerpc/kvm/book3s_64_vio_hv.c +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c @@ -206,10 +206,6 @@ static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm, /* it_userspace allocation might be delayed */ return H_TOO_HARD; - pua = (void *) vmalloc_to_phys(pua); - if (WARN_ON_ONCE_RM(!pua)) - return H_HARDWARE; - mem = mm_iommu_lookup_rm(kvm->mm, be64_to_cpu(*pua), pgsize); if (!mem) return H_TOO_HARD; @@ -282,10 +278,6 @@ static long kvmppc_rm_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, if (WARN_ON_ONCE_RM(mm_iommu_ua_to_hpa_rm(mem, ua, &hpa))) return H_HARDWARE; - pua = (void *) vmalloc_to_phys(pua); - if (WARN_ON_ONCE_RM(!pua)) - return H_HARDWARE; - if (WARN_ON_ONCE_RM(mm_iommu_mapped_inc(mem))) return H_CLOSED; |