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KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()

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Using "(u64 __user *)hva + offset" to get the virtual addresses of S1/S2
descriptors looks really wrong, if offset is not zero. What we want to get
for swapping is hva + offset, not hva + offset*8. ;-)

Fix it.

Fixes: f6927b41d5 ("KVM: arm64: Add helper for swapping guest descriptor")
Signed-off-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Link: https://patch.msgid.link/20260317115748.47332-1-zenghui.yu@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Zenghui Yu (Huawei)
2026-03-17 19:57:48 +08:00
committed by Marc Zyngier
parent 1744a6ef48
commit 0496acc42f
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/at.c
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@@ -1753,7 +1753,7 @@ int __kvm_at_swap_desc(struct kvm *kvm, gpa_t ipa, u64 old, u64 new)
if (!writable)
return -EPERM;
ptep = (u64 __user *)hva + offset;
ptep = (void __user *)hva + offset;
if (cpus_have_final_cap(ARM64_HAS_LSE_ATOMICS))
r = __lse_swap_desc(ptep, old, new);
else