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

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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: 9d05c1fee8 ("RISC-V: KVM: Implement stage2 page table programming")
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260718033646.002.31dc89f2-caplitmus-rv@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Pengpeng Hou 2026-07-18 11:52:36 +08:00 committed by Anup Patel
parent 1b5ea65ffd
commit e8f3e9ba14
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/kvm/mmu.c
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@ -272,7 +272,7 @@ 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;