[PATCH] RISC-V: KVM: Allow memslots ending at the GPA limit

[Pengpeng Hou]

KVM memslots describe half-open ranges [base_gfn, base_gfn + npages). A
slot ending exactly at the guest physical-address limit has its final page
below that limit and is valid.

The current greater-than-or-equal comparison rejects a valid boundary case.
Use a strict greater-than comparison, matching equivalent KVM architecture
checks.

Fixes: 9d05c1fee837 ("RISC-V: KVM: Implement stage2 page table programming")
Signed-off-by: Pengpeng Hou <pengpeng@xxxxxxxxxxx>
---
 arch/riscv/kvm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 082f9b2617338..d3c0c699adb60 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -184,7 +184,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 	 * Prevent userspace from creating a memory region outside of the GPA
 	 * space addressable by the KVM guest GPA space.
 	 */
-	if ((new->base_gfn + new->npages) >=
+	if ((new->base_gfn + new->npages) >
 	     kvm_riscv_gstage_gpa_size(kvm->arch.pgd_levels) >> PAGE_SHIFT)
 		return -EFAULT;
 
-- 
2.43.0