On 2019/4/10 23:23, Suzuki K Poulose wrote:
If we are checking whether the stage2 can map PAGE_SIZE,
we don't have to do the boundary checks as both the host
VMA and the guest memslots are page aligned. Bail the case
easily.
Cc: Christoffer Dall <christoffer.dall@xxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
---
virt/kvm/arm/mmu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index a39dcfd..6d73322 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1624,6 +1624,10 @@ static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
hva_t uaddr_start, uaddr_end;
size_t size;
+ /* The memslot and the VMA are guaranteed to be aligned to PAGE_SIZE */
+ if (map_size == PAGE_SIZE)
+ return true;
+
size = memslot->npages * PAGE_SIZE;
gpa_start = memslot->base_gfn << PAGE_SHIFT;
We can do a comment clean up as well in this patch.
s/<< PAGE_SIZE/<< PAGE_SHIFT/
thanks,
zenghui
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