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UPSTREAM: KVM: arm64: Use correct accessor to parse stage-1 PTEs

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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: e82edcc75c ("KVM: arm64: Implement do_share() helper for sharing memory")
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221025145156.855308-1-qperret@google.com
(cherry picked from commit 6853a71726)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 233587962
Bug: 233588291
Change-Id: Ied2a835735b5b71fc7aa5d5961fec032dfdca978
This commit is contained in:
Quentin Perret
2022-10-25 14:51:56 +00:00
committed by Treehugger Robot
parent 060e38dce1
commit ecf2d2e1eb
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -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,