[PATCH] KVM: arm64: Return -EPERM from __pkvm_host_share_hyp()
From: Quentin Perret <hidden>
Date: 2021-08-11 17:36:46
Also in:
kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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: Will Deacon <will@kernel.org> Signed-off-by: Quentin Perret <redacted> --- This patch fixes a bug introduced in the stage-2 ownership series which is already queued in kvmarm/next: https://lore.kernel.org/lkml/20210809152448.1810400-1-qperret@google.com/ (local) I've starred at this code for hours, but that clearly was not enough. Oh well ... --- 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 8165390d3ec9..6ec695311498 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c@@ -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:
--
2.32.0.605.g8dce9f2422-goog
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