Hi Oleksandr,
On 10/05/17 15:03, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
Update IOMMU mapping if the IOMMU doesn't share page table with the CPU.
The best place to do so on ARM is __p2m_set_entry(). Use mfn as an indicator
of the required action. If mfn is valid call iommu_map_pages(),
otherwise - iommu_unmap_pages().
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
CC: Julien Grall <julien.gr...@arm.com>
Acked-by: Julien Grall <julien.gr...@arm.com>
---
Changes in v1:
- Update IOMMU mapping in __p2m_set_entry() instead of p2m_set_entry().
- Pass order argument to IOMMU APIs instead of page_count.
---
xen/arch/arm/p2m.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 34d5776..9ca491b 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -984,7 +984,15 @@ static int __p2m_set_entry(struct p2m_domain *p2m,
p2m_free_entry(p2m, orig_pte, level);
if ( need_iommu(p2m->domain) && (p2m_valid(orig_pte) || p2m_valid(*entry))
)
- rc = iommu_iotlb_flush(p2m->domain, gfn_x(sgfn), 1UL << page_order);
+ {
+ if ( iommu_use_hap_pt(p2m->domain) )
+ rc = iommu_iotlb_flush(p2m->domain, gfn_x(sgfn), 1UL <<
page_order);
+ else if ( !mfn_eq(smfn, INVALID_MFN) )
+ rc = iommu_map_pages(p2m->domain, gfn_x(sgfn), mfn_x(smfn),
+ page_order, p2m_get_iommu_flags(t));
+ else
+ rc = iommu_unmap_pages(p2m->domain, gfn_x(sgfn), page_order);
+ }
else
rc = 0;
Cheers,
--
Julien Grall
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