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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-03-22 07:21:55 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2017-04-20 04:39:21 +0300 |
| commit | b1af23d836f811137d504d14d4cbdd01929dec34 (patch) | |
| tree | 384ee7a31114a4311b711f5cc582285d06ca7271 /arch/powerpc/kvm | |
| parent | da6f59e19233efdda58f196afbae8e05f6030d7f (diff) | |
| download | linux-b1af23d836f811137d504d14d4cbdd01929dec34.tar.xz | |
KVM: PPC: iommu: Unify TCE checking
This reworks helpers for checking TCE update parameters in way they
can be used in KVM.
This should cause no behavioral change.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_vio_hv.c | 31 |
1 files changed, 7 insertions, 24 deletions
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c index 0f145fc7a3a5..440d3ab5dc32 100644 --- a/arch/powerpc/kvm/book3s_64_vio_hv.c +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c @@ -62,27 +62,6 @@ struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm *kvm, EXPORT_SYMBOL_GPL(kvmppc_find_table); /* - * Validates IO address. - * - * WARNING: This will be called in real-mode on HV KVM and virtual - * mode on PR KVM - */ -long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt, - unsigned long ioba, unsigned long npages) -{ - unsigned long mask = (1ULL << stt->page_shift) - 1; - unsigned long idx = ioba >> stt->page_shift; - - if ((ioba & mask) || (idx < stt->offset) || - (idx - stt->offset + npages > stt->size) || - (idx + npages < idx)) - return H_PARAMETER; - - return H_SUCCESS; -} -EXPORT_SYMBOL_GPL(kvmppc_ioba_validate); - -/* * Validates TCE address. * At the moment flags and page mask are validated. * As the host kernel does not access those addresses (just puts them @@ -95,10 +74,14 @@ EXPORT_SYMBOL_GPL(kvmppc_ioba_validate); */ long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, unsigned long tce) { - unsigned long page_mask = ~((1ULL << stt->page_shift) - 1); - unsigned long mask = ~(page_mask | TCE_PCI_WRITE | TCE_PCI_READ); + unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); + enum dma_data_direction dir = iommu_tce_direction(tce); + + /* Allow userspace to poison TCE table */ + if (dir == DMA_NONE) + return H_SUCCESS; - if (tce & mask) + if (iommu_tce_check_gpa(stt->page_shift, gpa)) return H_PARAMETER; return H_SUCCESS; |