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

Bugzilla: https://bugzilla.redhat.com/2128973

commit 6853a71
Author: Quentin Perret <qperret@google.com>
Date:   Tue Oct 25 14:51:56 2022 +0000

    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: e82edcc ("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

Signed-off-by: Cornelia Huck <cohuck@redhat.com>

Author: cohuck

arch/arm64/kvm/hyp/nvhe/mem_protect.c

@@ -516,7 +516,7 @@ 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,