From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f73.google.com (mail-wr1-f73.google.com [209.85.221.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 363C542EEC7 for ; Tue, 16 Jun 2026 10:54:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781607268; cv=none; b=UdaIl7NyFF80YTjDVyh3v6BKMUNtxYNeO23cCdlttopMXdQRYtj5oTsvlg6IbxswkcoECVpVPt0TJnMjNHChqYMAL9ZHNj9+tjCHFT8WEI5dF1A99Ihd1givJ+lqjjn+1CZheHRevB0ZPib1sfrtvRcW7fwRAygbxmthZumVbJg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781607268; c=relaxed/simple; bh=AxhbvR2ZfFA+ZWiVMfIM4YJmysIERQasn9hcEH7J3YI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=AMYg/KRULwNkwu2K2+bsz59D5y2v1joOmOrJfCSu+ltoQ5XSecV17E7EO5QOS3cP2K0BuZ5FWvze+kd5M2xUW06VWpKPd7PgXZyqpuH7MgBOR/WACOMzD5BSSdOAkNooS4e8AE6yJH1VC7RKrGcQ7L/1kSWLQQ30sy3rAkVURUA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sebastianene.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=UnbsARHm; arc=none smtp.client-ip=209.85.221.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sebastianene.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="UnbsARHm" Received: by mail-wr1-f73.google.com with SMTP id ffacd0b85a97d-460163035e3so2650909f8f.2 for ; Tue, 16 Jun 2026 03:54:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781607266; x=1782212066; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=1MtrJN4EcerjeE6DHF17eBGjvGBuj7lWJfYdNgKlqOo=; b=UnbsARHmsPMxoxyrIqZg7DI9JqF+m/AzQLLl+TfURFc2L7NIwc79+7mbplXCSVbUhz LD0gJNGn4tzVFRCQOo2lVKWy2sqFoRZltW7Fr6cKGGptInHJEdHHDAhWwY+AmKbAPHyS zkXe71Jt27DF7muWTGX6gpESXxOGoTiekrImxzjfFqjz5sjTJk8sCnZicpsvfdvDHGtN jsaHnxn4Af0RsM8T00BSB3vvKCMqx2Fae1vwP0hm8fUttvNwZ5x2OG5ta6NLq1WOpdPM Dp7KWQnT2kO6egefvOkjzbY7Bya0L3FRP9aS9gy0UZ3m8t5v6GS7VSndobyVOEUq/hH4 DxRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781607266; x=1782212066; 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=1MtrJN4EcerjeE6DHF17eBGjvGBuj7lWJfYdNgKlqOo=; b=UIh2kQfIhJa5UCM0UtsDFLriQBvenHhdPEnRtKwtbAO7AqtbgCWUaQ756pNoHO31fp csWnEW5W3GqhhP64yZMN+YJpxJRBa38PK7WtzJJqABecA36H0BxHevYOiw+vKeVMvtV8 3zSz2dkqkotuwPMKKt6cwcSK1mW6bUdJ3ygW8Y7w9aQbQuSbwr05HBVIKWXkdXtWfpw+ kp3JQRE+7eEplTDxCJkWt09Q2bzM/akV1TFujchs3o96G88K1UHakYlOGED1IcBc96g1 WtR/lLogTtJoFR9KHZvnpUrcmPtRNpkyLQle4qrcEpYhuM/7k5v5gmM2+XjHOCTaNaL/ xQVg== X-Forwarded-Encrypted: i=1; AFNElJ/F1yZp1NehVOwOMCDs83jCQRIG+P/GBeflENPxzYW5eyJWUQN6fvbXj3wD7CkARhCFo2414V5dZC6XX8A=@vger.kernel.org X-Gm-Message-State: AOJu0YzLp1Xfp17daf7Y4i3T0oLiEOW/O/GY2WDxAqZ6fJOO4ngUdXIf oQp/9gc02/HWCe39rAMUXsBVJnpFYuiE8qZR8JVJjQVo5UbuJazlNEp9iV3XNib4h00fJkfFhW8 S0Vu6AI6XCYGM69ROEqfVsjwUTnnAWw== X-Received: from wmjv24.prod.google.com ([2002:a7b:cb58:0:b0:490:aeab:32d1]) (user=sebastianene job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:4e48:b0:490:e60b:6860 with SMTP id 5b1f17b1804b1-4922005e235mr182587895e9.7.1781607265338; Tue, 16 Jun 2026 03:54:25 -0700 (PDT) Date: Tue, 16 Jun 2026 10:54:09 +0000 In-Reply-To: <20260616105417.2578670-1-sebastianene@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260616105417.2578670-1-sebastianene@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260616105417.2578670-3-sebastianene@google.com> Subject: [PATCH v3 1/7] KVM: arm64: Support FFA_NOTIFICATION_BITMAP_CREATE in host handler From: Sebastian Ene To: catalin.marinas@arm.com, maz@kernel.org, oupton@kernel.org, will@kernel.org Cc: joey.gouly@arm.com, korneld@google.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, android-kvm@google.com, mrigendra.chaubey@gmail.com, perlarsen@google.com, sebastianene@google.com, suzuki.poulose@arm.com, vdonnefort@google.com, yuzenghui@huawei.com Content-Type: text/plain; charset="UTF-8" Allow FF-A notification bitmap creation messages to be forwarded to Trustzone from the host and introduce a helper to check for SBZ register fields. Signed-off-by: Sebastian Ene --- arch/arm64/kvm/hyp/nvhe/ffa.c | 36 ++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 1af722771178..b1e5f9ee86ef 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -71,6 +71,18 @@ static u32 hyp_ffa_version; static bool has_version_negotiated; static hyp_spinlock_t version_lock; +static bool ffa_check_unused_args_sbz(struct kvm_cpu_context *ctxt, int first_reg) +{ + int reg; + + for (reg = first_reg; reg < 17; reg++) { + if (cpu_reg(ctxt, reg)) + return true; + } + + return false; +} + static void ffa_to_smccc_error(struct arm_smccc_1_2_regs *res, u64 ffa_errno) { *res = (struct arm_smccc_1_2_regs) { @@ -676,7 +688,6 @@ static bool ffa_call_supported(u64 func_id) case FFA_MEM_DONATE: case FFA_MEM_RETRIEVE_REQ: /* Optional notification interfaces added in FF-A 1.1 */ - case FFA_NOTIFICATION_BITMAP_CREATE: case FFA_NOTIFICATION_BITMAP_DESTROY: case FFA_NOTIFICATION_BIND: case FFA_NOTIFICATION_UNBIND: @@ -862,6 +873,26 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs *res, hyp_spin_unlock(&host_buffers.lock); } +static void do_ffa_notif_bitmap(struct arm_smccc_1_2_regs *res, + struct kvm_cpu_context *ctxt) +{ + DECLARE_REG(u32, vmid, ctxt, 1); + struct arm_smccc_1_2_regs *args; + + if (ffa_check_unused_args_sbz(ctxt, 3)) { + ffa_to_smccc_res(res, FFA_RET_INVALID_PARAMETERS); + return; + } + + if (vmid != HOST_FFA_ID) { + ffa_to_smccc_res(res, FFA_RET_INVALID_PARAMETERS); + return; + } + + args = (void *)&ctxt->regs.regs[0]; + hyp_smccc_1_2_smc(args, res); +} + bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) { struct arm_smccc_1_2_regs res; @@ -920,6 +951,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) case FFA_PARTITION_INFO_GET: do_ffa_part_get(&res, host_ctxt); goto out_handled; + case FFA_NOTIFICATION_BITMAP_CREATE: + do_ffa_notif_bitmap(&res, host_ctxt); + goto out_handled; } if (ffa_call_supported(func_id)) -- 2.54.0.1099.g489fc7bff1-goog