From: Suzuki K Poulose <[email protected]> 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.
While we're at it, fixup a typo in the comment below. Cc: Christoffer Dall <[email protected]> Cc: Marc Zyngier <[email protected]> Signed-off-by: Suzuki K Poulose <[email protected]> Signed-off-by: Zenghui Yu <[email protected]> --- virt/kvm/arm/mmu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index e3b9ee268823..557f36866d1c 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1607,6 +1607,10 @@ 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; @@ -1626,7 +1630,7 @@ static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot, * |abcde|fgh Stage-1 block | Stage-1 block tv|xyz| * +-----+--------------------+--------------------+---+ * - * memslot->base_gfn << PAGE_SIZE: + * memslot->base_gfn << PAGE_SHIFT: * +---+--------------------+--------------------+-----+ * |abc|def Stage-2 block | Stage-2 block |tvxyz| * +---+--------------------+--------------------+-----+ -- 2.19.1
