From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oliver.upton@linux.dev>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
kvmarm@lists.linux.dev, Ricardo Koller <ricarkol@google.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 3/6] KVM: arm64: Return EAGAIN for invalid PTE in attr walker
Date: Fri, 2 Dec 2022 18:51:53 +0000 [thread overview]
Message-ID: <20221202185156.696189-4-oliver.upton@linux.dev> (raw)
In-Reply-To: <20221202185156.696189-1-oliver.upton@linux.dev>
Return EAGAIN for invalid PTEs in the attr walker, signaling to the
caller that any serialization and/or invalidation can be elided.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/hyp/pgtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 98818214a479..204e59e05674 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -1048,7 +1048,7 @@ static int stage2_attr_walker(const struct kvm_pgtable_visit_ctx *ctx,
struct kvm_pgtable_mm_ops *mm_ops = ctx->mm_ops;
if (!kvm_pte_valid(ctx->old))
- return 0;
+ return -EAGAIN;
data->level = ctx->level;
data->pte = pte;
--
2.39.0.rc0.267.gcb52ba06e7-goog
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next prev parent reply other threads:[~2022-12-02 18:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-02 18:51 [PATCH v2 0/6] KVM: arm64: Parallel access faults Oliver Upton
2022-12-02 18:51 ` [PATCH v2 1/6] KVM: arm64: Use KVM's pte type/helpers in handle_access_fault() Oliver Upton
2022-12-02 18:51 ` [PATCH v2 2/6] KVM: arm64: Ignore EAGAIN for walks outside of a fault Oliver Upton
2022-12-02 18:51 ` Oliver Upton [this message]
2022-12-02 18:51 ` [PATCH v2 4/6] KVM: arm64: Don't serialize if the access flag isn't set Oliver Upton
2022-12-02 18:51 ` [PATCH v2 5/6] KVM: arm64: Handle access faults behind the read lock Oliver Upton
2022-12-02 18:51 ` [PATCH v2 6/6] KVM: arm64: Condition HW AF updates on config option Oliver Upton
2023-01-23 20:29 ` [PATCH v2 0/6] KVM: arm64: Parallel access faults Oliver Upton
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