From nobody Fri Dec 19 08:06:29 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C7A3C433FE for ; Wed, 16 Nov 2022 17:04:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237371AbiKPREJ (ORCPT ); Wed, 16 Nov 2022 12:04:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50198 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234282AbiKPRDy (ORCPT ); Wed, 16 Nov 2022 12:03:54 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA8A42C66E for ; Wed, 16 Nov 2022 09:03:51 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id j132-20020a25238a000000b006da635e2073so16462991ybj.2 for ; Wed, 16 Nov 2022 09:03:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=IGAnxq8TxsaiJ4rE+mUN7BVSpa7cDNjlDGASV4bWpCs=; b=WJwAIwpyllGWtU5Y33F3Liqf/YIvtoOmru97wtImoiBp3Nn+xEqI6tv0y2+K8Y7cd8 YfsCJHf+g7pz4Ql+A0xh0aj+hrJ3JREtrpdk3cKf9lbVimZUCy1iAsJ5cwZHBLNJRolK 5jQqTJEtMgZ86xyOJjcSpBktYOO7HT4+lfBK2eT41evfRAQV5Cf+m1iZqzrGhPIW8RVp aEvLZXtdDp8b0NVmT8T9eYdv5M0+GP80sE6m6X621AVRDbLPf0YYJdjQI5PwhOf6h3Kz 88A+3FNo2ZLDA3i4G6zrNrfv1BzdATpngxJnltogw/VIaQjQM3T2MaxhaGjR9j0UuV7A 0l0A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=IGAnxq8TxsaiJ4rE+mUN7BVSpa7cDNjlDGASV4bWpCs=; b=w9FBY+bOmNM9aLYG49FHoNhJdBObDOGGEvOyLp7IrI7WQ6XA1ad4gyV5c0aZK9aOB5 z7Vp18sRjoaKG3x28HV06isevTIFSYOJzJ1dVlelt1XtRpldkAg2RP0+YKN5rNsaEaat 29CK+s7qVxaiEsWrtCKK2l5TKiUwrvskuQOtjIJ2cb8e7Ak0NVZkIGb6oA4i5CEOoa5y v7JSTE/6hQFIVpw+XySIbrRetwNwgsfZ7t77e3K0KYDyrZsvfavLgpvF2DLzbTrfUuUi 8bmxonOY3kU0b8RlG/jpk9ASRMg9X80It8zYS0R/okd25EZ0/TePElR+xkdNJ8kFcHDA 1rVw== X-Gm-Message-State: ACrzQf16P4lI+XkeMPVw0XnNZbEoa5X6BzODVrAcK7evKjpTthjD+r3U N/7IRFok/P/DK4DKNteLTzydXUNn+/g+ X-Google-Smtp-Source: AMsMyM6LpibcCa3tAvXcPcc9JdUaf9/9fnPypWpp5sDfstjX9mSh84f9tOoNKg6gUA/4AaKj5a/N2Zknhusm X-Received: from big-boi.c.googlers.com ([fda3:e722:ac3:cc00:31:98fb:c0a8:129]) (user=qperret job=sendgmr) by 2002:a0d:f647:0:b0:36f:f93c:c543 with SMTP id g68-20020a0df647000000b0036ff93cc543mr60967412ywf.325.1668618230643; Wed, 16 Nov 2022 09:03:50 -0800 (PST) Date: Wed, 16 Nov 2022 17:03:28 +0000 In-Reply-To: <20221116170335.2341003-1-qperret@google.com> Mime-Version: 1.0 References: <20221116170335.2341003-1-qperret@google.com> X-Mailer: git-send-email 2.38.1.431.g37b22c650d-goog Message-ID: <20221116170335.2341003-6-qperret@google.com> Subject: [PATCH 05/12] KVM: arm64: Handle FFA_FEATURES call from the host From: Quentin Perret To: Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Catalin Marinas , Will Deacon , Sudeep Holla , Andrew Walbran Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kernel-team@android.com, qperret@google.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Fuad Tabba Filter out advertising unsupported features, and only advertise features and properties that are supported by the hypervisor proxy. Signed-off-by: Fuad Tabba Signed-off-by: Quentin Perret --- arch/arm64/kvm/hyp/nvhe/ffa.c | 44 +++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 969d72390844..d199f868583e 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -45,6 +45,16 @@ static void ffa_to_smccc_error(struct arm_smccc_res *res= , u64 ffa_errno) }; } =20 +static void ffa_to_smccc_res_prop(struct arm_smccc_res *res, int ret, u64 = prop) +{ + if (ret =3D=3D FFA_RET_SUCCESS) { + *res =3D (struct arm_smccc_res) { .a0 =3D FFA_SUCCESS, + .a2 =3D prop }; + } else { + ffa_to_smccc_error(res, ret); + } +} + static void ffa_set_retval(struct kvm_cpu_context *ctxt, struct arm_smccc_res *res) { @@ -89,6 +99,35 @@ static bool ffa_call_unsupported(u64 func_id) return false; } =20 +static bool do_ffa_features(struct arm_smccc_res *res, + struct kvm_cpu_context *ctxt) +{ + DECLARE_REG(u32, id, ctxt, 1); + u64 prop =3D 0; + int ret =3D 0; + + if (ffa_call_unsupported(id)) { + ret =3D FFA_RET_NOT_SUPPORTED; + goto out_handled; + } + + switch (id) { + case FFA_MEM_SHARE: + case FFA_FN64_MEM_SHARE: + case FFA_MEM_LEND: + case FFA_FN64_MEM_LEND: + ret =3D FFA_RET_SUCCESS; + prop =3D 0; /* No support for dynamic buffers */ + goto out_handled; + default: + return false; + } + +out_handled: + ffa_to_smccc_res_prop(res, ret, prop); + return true; +} + bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt) { DECLARE_REG(u64, func_id, host_ctxt, 0); @@ -98,6 +137,10 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_= ctxt) return false; =20 switch (func_id) { + case FFA_FEATURES: + if (!do_ffa_features(&res, host_ctxt)) + return false; + goto out_handled; /* Memory management */ case FFA_FN64_RXTX_MAP: case FFA_RXTX_UNMAP: @@ -114,6 +157,7 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_= ctxt) return false; /* Pass through */ =20 ffa_to_smccc_error(&res, FFA_RET_NOT_SUPPORTED); +out_handled: ffa_set_retval(host_ctxt, &res); return true; } --=20 2.38.1.431.g37b22c650d-goog