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authorAlexey Kardashevskiy <aik@ozlabs.ru>2018-12-19 09:52:15 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2018-12-21 06:20:46 +0100
commitc10c21efa4bccab486c2e6a047c13dfa6cf7426c (patch)
treecd4df28268ab37a3d2aef950b70f8a8a1ffd6388 /arch/powerpc/kernel/iommu.c
parentpowerpc/mm/iommu/vfio_spapr_tce: Change mm_iommu_get to reference a region (diff)
downloadlinux-c10c21efa4bccab486c2e6a047c13dfa6cf7426c.tar.xz
linux-c10c21efa4bccab486c2e6a047c13dfa6cf7426c.zip
powerpc/vfio/iommu/kvm: Do not pin device memory
This new memory does not have page structs as it is not plugged to the host so gup() will fail anyway. This adds 2 helpers: - mm_iommu_newdev() to preregister the "memory device" memory so the rest of API can still be used; - mm_iommu_is_devmem() to know if the physical address is one of thise new regions which we must avoid unpinning of. This adds @mm to tce_page_is_contained() and iommu_tce_xchg() to test if the memory is device memory to avoid pfn_to_page(). This adds a check for device memory in mm_iommu_ua_mark_dirty_rm() which does delayed pages dirtying. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/iommu.c')
-rw-r--r--arch/powerpc/kernel/iommu.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index f0dc680e659a..cbcc6152b7f5 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -47,6 +47,7 @@
#include <asm/fadump.h>
#include <asm/vio.h>
#include <asm/tce.h>
+#include <asm/mmu_context.h>
#define DBG(...)
@@ -993,15 +994,19 @@ int iommu_tce_check_gpa(unsigned long page_shift, unsigned long gpa)
}
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)
+long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl,
+ unsigned long entry, unsigned long *hpa,
+ enum dma_data_direction *direction)
{
long ret;
+ unsigned long size = 0;
ret = tbl->it_ops->exchange(tbl, entry, hpa, direction);
if (!ret && ((*direction == DMA_FROM_DEVICE) ||
- (*direction == DMA_BIDIRECTIONAL)))
+ (*direction == DMA_BIDIRECTIONAL)) &&
+ !mm_iommu_is_devmem(mm, *hpa, tbl->it_page_shift,
+ &size))
SetPageDirty(pfn_to_page(*hpa >> PAGE_SHIFT));
/* if (unlikely(ret))