From ecf2d2e1eb2617a35a02391ed062cfd0031d2ccf Mon Sep 17 00:00:00 2001 From: Quentin Perret Date: Tue, 25 Oct 2022 14:51:56 +0000 Subject: [PATCH] UPSTREAM: KVM: arm64: Use correct accessor to parse stage-1 PTEs hyp_get_page_state() is used with pKVM to retrieve metadata about a page by parsing a hypervisor stage-1 PTE. However, it incorrectly uses a helper which parses *stage-2* mappings. Ouch. Luckily, pkvm_getstate() only looks at the software bits, which happen to be in the same place for stage-1 and stage-2 PTEs, and this all ends up working correctly by accident. But clearly, we should do better. Fix hyp_get_page_state() to use the correct helper. Fixes: e82edcc75c4e ("KVM: arm64: Implement do_share() helper for sharing memory") Signed-off-by: Quentin Perret Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20221025145156.855308-1-qperret@google.com (cherry picked from commit 6853a71726b6f5930b4450889faf02e8f1cfe35c) Signed-off-by: Will Deacon Bug: 233587962 Bug: 233588291 Change-Id: Ied2a835735b5b71fc7aa5d5961fec032dfdca978 --- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index 567e74a7cbf8..5ac5ad879419 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -827,7 +827,7 @@ static enum pkvm_page_state hyp_get_page_state(kvm_pte_t pte) if (!kvm_pte_valid(pte)) return PKVM_NOPAGE; - return pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte)); + return pkvm_getstate(kvm_pgtable_hyp_pte_prot(pte)); } static int __hyp_check_page_state_range(u64 addr, u64 size,