This enables userspace view of TCE tables to start from non-zero offset
on a bus. This will be used for huge DMA windows.
This only changes the internal structure, the user interface needs to
change in order to use an offset.
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
---
arch/powerpc/include/asm/kvm_host.h | 1 +
arch/powerpc/kvm/book3s_64_vio_hv.c | 7 +++++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h
b/arch/powerpc/include/asm/kvm_host.h
index edf66f7..2e7c791 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -184,6 +184,7 @@ struct kvmppc_spapr_tce_table {
u64 liobn;
struct rcu_head rcu;
u32 page_shift;
+ u64 offset; /* in pages */
u64 size; /* window size in pages */
struct page *pages[0];
};
diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c
b/arch/powerpc/kvm/book3s_64_vio_hv.c
index c786a58..44be73e 100644
--- a/arch/powerpc/kvm/book3s_64_vio_hv.c
+++ b/arch/powerpc/kvm/book3s_64_vio_hv.c
@@ -75,7 +75,9 @@ long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt,
unsigned long mask = (1ULL << stt->page_shift) - 1;
unsigned long idx = ioba >> stt->page_shift;
- if ((ioba & mask) || (idx + npages > stt->size) || (idx + npages < idx))
+ if ((ioba & mask) || (idx < stt->offset) ||
+ (idx - stt->offset + npages > stt->size) ||
+ (idx + npages < idx))
return H_PARAMETER;
return H_SUCCESS;
@@ -147,6 +149,7 @@ void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt,
struct page *page;
u64 *tbl;
+ idx -= stt->offset;
page = stt->pages[idx / TCES_PER_PAGE];
tbl = kvmppc_page_address(page);
@@ -335,7 +338,7 @@ long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long
liobn,
if (ret != H_SUCCESS)
return ret;
- idx = ioba >> stt->page_shift;
+ idx = (ioba >> stt->page_shift) - stt->offset;
page = stt->pages[idx / TCES_PER_PAGE];
tbl = (u64 *)page_address(page);
--
2.5.0.rc3
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