Commit 12593568 authored by Quentin Perret's avatar Quentin Perret Committed by Marc Zyngier
Browse files

KVM: arm64: Return -EPERM from __pkvm_host_share_hyp() 



Fix the error code returned by __pkvm_host_share_hyp() when the
host attempts to share with EL2 a page that has already been shared with
another entity.

Reported-by: default avatarWill Deacon <will@kernel.org>
Signed-off-by: default avatarQuentin Perret <qperret@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210811173630.2536721-1-qperret@google.com
parent 64a80fb7

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

+1 −1
Original line number Diff line number Diff line
@@ -404,7 +404,7 @@ int __pkvm_host_share_hyp(u64 pfn) 
	cur = kvm_pgtable_hyp_pte_prot(pte);

	prot = pkvm_mkstate(PAGE_HYP, PKVM_PAGE_SHARED_BORROWED);

	if (!check_prot(cur, prot, ~prot))

		ret = EPERM;

		ret = -EPERM;

	goto unlock;



map_shared: