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Commit b1af23d8 authored by Alexey Kardashevskiy's avatar Alexey Kardashevskiy Committed by Paul Mackerras
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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: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent da6f59e1

arch/powerpc/include/asm/iommu.h

+15 −5
Original line number Diff line number Diff line
@@ -296,11 +296,21 @@ static inline void iommu_restore(void) 
#endif



/* The API to support IOMMU operations for VFIO */

extern int iommu_tce_clear_param_check(struct iommu_table *tbl,

		unsigned long ioba, unsigned long tce_value,

		unsigned long npages);

extern int iommu_tce_put_param_check(struct iommu_table *tbl,

		unsigned long ioba, unsigned long tce);

extern int iommu_tce_check_ioba(unsigned long page_shift,

		unsigned long offset, unsigned long size,

		unsigned long ioba, unsigned long npages);

extern int iommu_tce_check_gpa(unsigned long page_shift,

		unsigned long gpa);



#define iommu_tce_clear_param_check(tbl, ioba, tce_value, npages) \

		(iommu_tce_check_ioba((tbl)->it_page_shift,       \

				(tbl)->it_offset, (tbl)->it_size, \

				(ioba), (npages)) || (tce_value))

#define iommu_tce_put_param_check(tbl, ioba, gpa)                 \

		(iommu_tce_check_ioba((tbl)->it_page_shift,       \

				(tbl)->it_offset, (tbl)->it_size, \

				(ioba), 1) ||                     \

		iommu_tce_check_gpa((tbl)->it_page_shift, (gpa)))



extern void iommu_flush_tce(struct iommu_table *tbl);

extern int iommu_take_ownership(struct iommu_table *tbl);

arch/powerpc/include/asm/kvm_ppc.h

+4 −2
Original line number Diff line number Diff line
@@ -178,8 +178,10 @@ extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, 
				struct kvm_create_spapr_tce_64 *args);

extern struct kvmppc_spapr_tce_table *kvmppc_find_table(

		struct kvm *kvm, unsigned long liobn);

extern long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt,

		unsigned long ioba, unsigned long npages);

#define kvmppc_ioba_validate(stt, ioba, npages)                         \

		(iommu_tce_check_ioba((stt)->page_shift, (stt)->offset, \

				(stt)->size, (ioba), (npages)) ?        \

				H_PARAMETER : H_SUCCESS)

extern long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *tt,

		unsigned long tce);

extern long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa,

arch/powerpc/kernel/iommu.c

+13 −24
Original line number Diff line number Diff line
@@ -963,47 +963,36 @@ void iommu_flush_tce(struct iommu_table *tbl) 
}

EXPORT_SYMBOL_GPL(iommu_flush_tce);



int iommu_tce_clear_param_check(struct iommu_table *tbl,

		unsigned long ioba, unsigned long tce_value,

		unsigned long npages)

int iommu_tce_check_ioba(unsigned long page_shift,

		unsigned long offset, unsigned long size,

		unsigned long ioba, unsigned long npages)

{

	/* tbl->it_ops->clear() does not support any value but 0 */

	if (tce_value)

		return -EINVAL;

	unsigned long mask = (1UL << page_shift) - 1;



	if (ioba & ~IOMMU_PAGE_MASK(tbl))

	if (ioba & mask)

		return -EINVAL;



	ioba >>= tbl->it_page_shift;

	if (ioba < tbl->it_offset)

	ioba >>= page_shift;

	if (ioba < offset)

		return -EINVAL;



	if ((ioba + npages) > (tbl->it_offset + tbl->it_size))

	if ((ioba + 1) > (offset + size))

		return -EINVAL;



	return 0;

}

EXPORT_SYMBOL_GPL(iommu_tce_clear_param_check);

EXPORT_SYMBOL_GPL(iommu_tce_check_ioba);



int iommu_tce_put_param_check(struct iommu_table *tbl,

		unsigned long ioba, unsigned long tce)

int iommu_tce_check_gpa(unsigned long page_shift, unsigned long gpa)

{

	if (tce & ~IOMMU_PAGE_MASK(tbl))

		return -EINVAL;



	if (ioba & ~IOMMU_PAGE_MASK(tbl))

		return -EINVAL;



	ioba >>= tbl->it_page_shift;

	if (ioba < tbl->it_offset)

		return -EINVAL;

	unsigned long mask = (1UL << page_shift) - 1;



	if ((ioba + 1) > (tbl->it_offset + tbl->it_size))

	if (gpa & mask)

		return -EINVAL;



	return 0;

}

EXPORT_SYMBOL_GPL(iommu_tce_put_param_check);

EXPORT_SYMBOL_GPL(iommu_tce_check_gpa);



long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry,

		unsigned long *hpa, enum dma_data_direction *direction)

arch/powerpc/kvm/book3s_64_vio_hv.c

+7 −24
Original line number Diff line number Diff line
@@ -61,27 +61,6 @@ 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.
@@ -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;