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[104.155.91.135]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-486eb33e020sm34764203f8f.18.2026.09.15.02.24.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2026 02:24:45 -0700 (PDT) Date: Tue, 15 Sep 2026 10:24:41 +0100 From: Vincent Donnefort To: perlarsen@google.com Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Yeoreum Yun , Ben Horgan , Oliver Upton , Sebastien Ene , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, Fuad Tabba Subject: Re: [PATCH v7 2/3] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler Message-ID: References: <20260830-host-direct-messages-v7-0-45f6e6db72c2@google.com> <20260830-host-direct-messages-v7-2-45f6e6db72c2@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260830-host-direct-messages-v7-2-45f6e6db72c2@google.com> On Sun, Aug 30, 2026 at 11:08:14PM +0000, Per Larsen via B4 Relay wrote: > From: Sebastian Ene > > Allow direct messages to be forwarded from the host. The host should > not be sending framework messages so they are filtered out. > > Signed-off-by: Sebastian Ene > Reviewed-by: Yeoreum Yun > Signed-off-by: Per Larsen > --- > arch/arm64/kvm/hyp/nvhe/ffa.c | 27 +++++++++++++++++++++++++++ > include/linux/arm_ffa.h | 2 ++ > 2 files changed, 29 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c > index 9e8bb95e8845..96cf6be969de 100644 > --- a/arch/arm64/kvm/hyp/nvhe/ffa.c > +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c > @@ -880,6 +880,29 @@ 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) > +{ > + DECLARE_REG(u64, endp, ctxt, 1); > + DECLARE_REG(u64, flags, ctxt, 2); > + > + struct arm_smccc_1_2_regs *args = (void *)&ctxt->regs.regs[0]; For a next version, ffa_check_unused_args_sbz() has just been merged. [1] [1] https://lore.kernel.org/all/20260907171930.4037166-8-sebastianene@google.com/ -- Vincent > + > + if (upper_32_bits(endp) || > + FIELD_GET(FFA_SRC_ENDPOINT_MASK, endp) != HOST_FFA_ID) { > + ffa_to_smccc_error(res, FFA_RET_INVALID_PARAMETERS); > + return; > + } > + > + /* filter out framework messages and validate SBZ/MBZ bits */ > + if (flags) { > + ffa_to_smccc_error(res, FFA_RET_INVALID_PARAMETERS); > + return; > + } > + > + 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 = {0}; > @@ -938,6 +961,10 @@ 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); > + goto out_handled; > } > > if (ffa_call_supported(func_id)) > diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h > index e71d83ee0aef..a3f44e7c08de 100644 > --- a/include/linux/arm_ffa.h > +++ b/include/linux/arm_ffa.h > @@ -269,6 +269,8 @@ bool ffa_partition_check_property(struct ffa_device *dev, u32 property) > (ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_REQ2_RECV) && \ > !dev->mode_32bit) > > +#define FFA_SRC_ENDPOINT_MASK GENMASK(31, 16) > + > /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */ > struct ffa_send_direct_data { > unsigned long data0; /* w3/x3 */ > > -- > 2.55.0.897.gb25b4bd76c-goog > > >