From nobody Sun Feb 8 02:34:46 2026 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 0FCBD3002C8; Sun, 21 Dec 2025 16:10:12 +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=1766333413; cv=none; b=csSx6+avZ9p7ByAKRrDwLH8mx75/gRYAnB1s5CXzEsEQsp6yi9xpHCJP0AUE0gzIVzMEHcWVawykjiQ4iffEMtRBFNVQ6jvLvAqN95AIbLo8Obu3h5RsFZcjEGMSGqWjRp2drpXHll88QV8C+B8z1KEy4YGtzgWY1ngfbI+/hXQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766333413; c=relaxed/simple; bh=8JhW/AIVPr/MiSpHSTVTOPPu4Co1j1DWUKPY4klH/fE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ag8DZJhG/6B8qnncgZtGUbCVN9AYDc64IVeEp3qJwmHtbV0Dz+suhXJ8p+MZv2lyvSZskAXWqcd4HkYAYBTwmiyi4XG/Evsd7oyhK7NnkzwWilp4qO1wZ5VqPgf6BA4IcsZOIuzNO8VyNMWcGDImn2Ip+2ri81bg5rm82gfZWfY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pVJW5TLI; 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="pVJW5TLI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C90CC4CEFB; Sun, 21 Dec 2025 16:10:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766333412; bh=8JhW/AIVPr/MiSpHSTVTOPPu4Co1j1DWUKPY4klH/fE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pVJW5TLIc1WnpPMtEBWqyDFeiziw+2Ln/n0405sG+BksRmHBVTGEKRBKDjs+JlTka ul5sTVJ5CMnC3BpiRL4zTwL7XNx0gUf746gmyTVt7Z3TIBYfxm9HIO3fO76PtXo44o 58O+1CVeuIcXAPEGHLImvSA1ZvXko40pirqC+zt8DeHvh/hhCXJLM/lQzoVR1z4Ety hmhsQq4Q0boOKFWEeCJ4C3v70mqtdYYFA+vBkK3N7trZYkcKJdickU1Ana+82uF6iI AsPgJjaIx+SQEKNO1onWdwa3/0o2WBmEFAoGXoI0J7azcYkTGe8nj8p34cfuakb7YN IeN2jr6s9DA7w== From: "Aneesh Kumar K.V (Arm)" To: linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-coco@lists.linux.dev Cc: Catalin Marinas , will@kernel.org, maz@kernel.org, tglx@linutronix.de, robin.murphy@arm.com, suzuki.poulose@arm.com, akpm@linux-foundation.org, jgg@ziepe.ca, steven.price@arm.com, "Aneesh Kumar K.V (Arm)" Subject: [PATCH v2 3/4] coco: host: arm64: Handle hostconf RHI calls in kernel Date: Sun, 21 Dec 2025 21:39:19 +0530 Message-ID: <20251221160920.297689-4-aneesh.kumar@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251221160920.297689-1-aneesh.kumar@kernel.org> References: <20251221160920.297689-1-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" - Mark hostconf RHI SMC IDs as handled in the SMCCC filter. - Return version/features plus PAGE_SIZE alignment for guest queries. - Drop the 4K page-size guard in RMI init now that realm can query IPA change alignment size via the hostconf RHI Signed-off-by: Aneesh Kumar K.V (Arm) --- arch/arm64/kvm/hypercalls.c | 23 ++++++++++++++++++++++- arch/arm64/kvm/rmi.c | 4 ---- 2 files changed, 22 insertions(+), 5 deletions(-) diff --git a/arch/arm64/kvm/hypercalls.c b/arch/arm64/kvm/hypercalls.c index 70ac7971416c..2861ca9063dd 100644 --- a/arch/arm64/kvm/hypercalls.c +++ b/arch/arm64/kvm/hypercalls.c @@ -8,6 +8,7 @@ =20 #include #include +#include =20 #define KVM_ARM_SMCCC_STD_FEATURES \ GENMASK(KVM_REG_ARM_STD_BMAP_BIT_COUNT - 1, 0) @@ -77,6 +78,9 @@ static bool kvm_smccc_default_allowed(u32 func_id) */ case ARM_SMCCC_VERSION_FUNC_ID: case ARM_SMCCC_ARCH_FEATURES_FUNC_ID: + case RHI_HOSTCONF_VERSION: + case RHI_HOSTCONF_FEATURES: + case RHI_HOSTCONF_GET_IPA_CHANGE_ALIGNMENT: return true; default: /* PSCI 0.2 and up is in the 0:0x1f range */ @@ -157,7 +161,15 @@ static int kvm_smccc_filter_insert_reserved(struct kvm= *kvm) GFP_KERNEL_ACCOUNT); if (r) goto out_destroy; - + /* + * Don't forward RHI_HOST_CONF related RHI calls + */ + r =3D mtree_insert_range(&kvm->arch.smccc_filter, + RHI_HOSTCONF_VERSION, RHI_HOSTCONF_GET_IPA_CHANGE_ALIGNMENT, + xa_mk_value(KVM_SMCCC_FILTER_HANDLE), + GFP_KERNEL_ACCOUNT); + if (r) + goto out_destroy; return 0; out_destroy: mtree_destroy(&kvm->arch.smccc_filter); @@ -376,6 +388,15 @@ int kvm_smccc_call_handler(struct kvm_vcpu *vcpu) case ARM_SMCCC_TRNG_RND32: case ARM_SMCCC_TRNG_RND64: return kvm_trng_call(vcpu); + case RHI_HOSTCONF_VERSION: + val[0] =3D RHI_HOSTCONF_VER_1_0; + break; + case RHI_HOSTCONF_FEATURES: + val[0] =3D __RHI_HOSTCONF_GET_IPA_CHANGE_ALIGNMENT; + break; + case RHI_HOSTCONF_GET_IPA_CHANGE_ALIGNMENT: + val[0] =3D PAGE_SIZE; + break; default: return kvm_psci_call(vcpu); } diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c index 9957a71d21b1..bd345e051a24 100644 --- a/arch/arm64/kvm/rmi.c +++ b/arch/arm64/kvm/rmi.c @@ -1935,10 +1935,6 @@ EXPORT_SYMBOL_GPL(kvm_has_da_feature); =20 void kvm_init_rmi(void) { - /* Only 4k page size on the host is supported */ - if (PAGE_SIZE !=3D SZ_4K) - return; - /* Continue without realm support if we can't agree on a version */ if (rmi_check_version()) return; --=20 2.43.0