From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C9313009EE; Mon, 15 Sep 2025 11:44:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757936699; cv=none; b=CyP17bnbmu2yGdar4UyGLbLZhIAy0TwhLE5X8q8JpCS0YcbzZczlgtz6ovWfU4u6RkCsh04iyCYSMe74zYNnNK5VIRLrG18Pdeu1MxoiIyK6UC9vnb9eFHDt4z0Dm7dlefhXgbVewBqaoUHIAoQPLQQ30tTMIaeMlR9nS22gxQs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757936699; c=relaxed/simple; bh=6s66At4Y3xWWNXiyYuFX05mylZmGoxm2uLgtoUWeXiA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=qfyc4nhZMBS9HVCTNBuz+M7dLi1P5++B4e0/NPuK+NpQyzQ4a5zcT0N9cxJOWLiSb24CFS+pDct9ygQ+vM+JV9qGuGkF1GQHWQTEKLgV8N75PVHipe9/mTjlzyJv8sxQBlj8idBiDY5jDKUnsENP5Xbe38ayARlfTZrOSiEU1H8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RmzyqXcl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RmzyqXcl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E0F4C4CEFE; Mon, 15 Sep 2025 11:44:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1757936699; bh=6s66At4Y3xWWNXiyYuFX05mylZmGoxm2uLgtoUWeXiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RmzyqXcl6lY6d8jCKbzMWnQBIMj3Qdmm2RH23MLhQZOXrKEGnJUBWe7YEsSa9wUkZ FRlPSg+IM2zog2EAzaJw8H+utTAzH5D6qYzRCyHYjljn2hvXnLdVKhoSe7l82SmKno f9jhArycNs4MOz2dycgH6Fsdu05UQHkT/VVFn3Hv14mEpRPE8E+byp/AcSxASme0/P rYTanIspErJCI5b9MqaE9x5aJ2CyfYj3AVmJ6QoVgVCxkaFDrtxq4O4psAc9w7K4w3 1GHLQ0Gn777onNovviQc6VXwmg0meaCmezWJcGii89dh63iozOZnEtuzzWb5NkYl+0 kimjNBQvJcDjg== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1uy7dh-00000006MDw-2Bbe; Mon, 15 Sep 2025 11:44:57 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH v2 13/16] KVM: arm64: Add filtering hook to S1 page table walk Date: Mon, 15 Sep 2025 12:44:48 +0100 Message-Id: <20250915114451.660351-14-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250915114451.660351-1-maz@kernel.org> References: <20250915114451.660351-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Add a filtering hook that can get called on each level of the walk, and providing access to the full state. Crucially, this is called *before* the access is made, so that it is possible to track down the level of a faulting access. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_nested.h | 14 ++++++++++++++ arch/arm64/kvm/at.c | 11 +++++++++++ 2 files changed, 25 insertions(+) diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h index f3135ded47b7d..cce0e4cb54484 100644 --- a/arch/arm64/include/asm/kvm_nested.h +++ b/arch/arm64/include/asm/kvm_nested.h @@ -288,7 +288,21 @@ enum trans_regime { TR_EL2, }; +struct s1_walk_info; + +struct s1_walk_context { + struct s1_walk_info *wi; + u64 table_ipa; + int level; +}; + +struct s1_walk_filter { + int (*fn)(struct s1_walk_context *, void *); + void *priv; +}; + struct s1_walk_info { + struct s1_walk_filter *filter; u64 baddr; enum trans_regime regime; unsigned int max_oa_bits; diff --git a/arch/arm64/kvm/at.c b/arch/arm64/kvm/at.c index 2f6f83cc8d19d..c099bab30cb0d 100644 --- a/arch/arm64/kvm/at.c +++ b/arch/arm64/kvm/at.c @@ -413,6 +413,17 @@ static int walk_s1(struct kvm_vcpu *vcpu, struct s1_walk_info *wi, ipa = kvm_s2_trans_output(&s2_trans); } + if (wi->filter) { + ret = wi->filter->fn(&(struct s1_walk_context) + { + .wi = wi, + .table_ipa = baddr, + .level = level, + }, wi->filter->priv); + if (ret) + return ret; + } + ret = kvm_read_guest(vcpu->kvm, ipa, &desc, sizeof(desc)); if (ret) { fail_s1_walk(wr, ESR_ELx_FSC_SEA_TTW(level), false); -- 2.39.2