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 742A8340A44; Fri, 14 Nov 2025 17:41:45 +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=1763142105; cv=none; b=LlTv9aGnsROySofB6EkT1RltteLlLQOS3IAcHZPW6qBSxSmq9IMg0tc4OOBgAZOM1qHNFOZajiSlNATioEDYdQ1UZ/MCuUfKS2j1rVEuQ8mguSmFV9sZyycoyjHt+756j6eCb4nLeyXDiP8MPyJjKs2LxVFfcbQy+9reb0eK5ec= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763142105; c=relaxed/simple; bh=IQZR6GSdsfxkXbWwpBWciwNfmoY8y6liTJu6TwjjAWU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=e5sMNoX+KF42RZCcIIP8phbdsOoHeThvjLO069Ps/rzoN8XvfyWPMtMT3HxyiqFGuEJle3azhlpxqD6YH9WdNmbgazo8RWNFZmdM1wq4aoioIDdCokiAUPLJSotxg4a1VOxNNa3GAobG1oZ6zz4H4wHcgI7DzbHDpMbROtq1nL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hk6XIezo; 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="hk6XIezo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66731C116D0; Fri, 14 Nov 2025 17:41:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763142105; bh=IQZR6GSdsfxkXbWwpBWciwNfmoY8y6liTJu6TwjjAWU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hk6XIezoo/nMtNckSn17IIlP0olpWzyv6gHkAkkgDZS0z/4FfzAdOD1RDoY9DAlp9 Vx+z1XQvLC8KC3+MT6fU83Cw462fnoyo0KN6AoCKswor6OvN6ddCGRYKsfR9CfG8lI DbvhEHbR3yR94FyfSTIzgSBzf8cHh5oaVWOW24JXCxIKWysEiorhDcnzDjR9nDJWqX 2sakkLLKUm7qNGP1g6x5CYDsf8KDjDYWY2yv7eimWa700/Nn5Q59JPBwRt5PDAT4t4 etMtcRTXG6ialwlupGxG9qOQOnWsBU3L1kFZCtimHG/mVKJtYzTHNdbEJFFh4bPcL8 eIfR2MHEOACTQ== Date: Fri, 14 Nov 2025 17:41:39 +0000 From: Will Deacon To: perlarsen@google.com Cc: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Yeoreum Yun , Ben Horgan , Armelle Laine , Sebastien Ene , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler Message-ID: References: <20251030-host-direct-messages-v2-0-9f27cef36730@google.com> <20251030-host-direct-messages-v2-1-9f27cef36730@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251030-host-direct-messages-v2-1-9f27cef36730@google.com> On Thu, Oct 30, 2025 at 03:49:16PM +0000, Per Larsen via B4 Relay wrote: > From: Sebastian Ene > > Allow direct messages to be forwarded from the host. > > Signed-off-by: Sebastian Ene > Signed-off-by: Per Larsen > --- > arch/arm64/kvm/hyp/nvhe/ffa.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c > index 4e16f9b96f637599873b16148c6e40cf1210aa3e..bb38ee7c86bad1646c16c562127eb3bef6297a84 100644 > --- a/arch/arm64/kvm/hyp/nvhe/ffa.c > +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c > @@ -857,6 +857,15 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs *res, > hyp_spin_unlock(&host_buffers.lock); > } > > +static void do_ffa_direct_msg(struct arm_smccc_1_2_regs *res, > + struct kvm_cpu_context *ctxt, > + u64 vm_handle) > +{ > + struct arm_smccc_1_2_regs *args = (void *)&ctxt->regs.regs[0]; > + > + arm_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; > @@ -915,6 +924,10 @@ 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_MSG_SEND_DIRECT_REQ: > + case FFA_FN64_MSG_SEND_DIRECT_REQ: > + do_ffa_direct_msg(&res, host_ctxt, HOST_FFA_ID); > + goto out_handled; Should we filter out framework messages so that this is limited to partition messages instead? Will