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[104.155.91.135]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bfdb7b6d9b7sm644734366b.41.2026.06.16.05.47.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jun 2026 05:47:14 -0700 (PDT) Date: Tue, 16 Jun 2026 13:47:11 +0100 From: Vincent Donnefort To: Sebastian Ene Cc: catalin.marinas@arm.com, maz@kernel.org, oupton@kernel.org, will@kernel.org, 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, suzuki.poulose@arm.com, yuzenghui@huawei.com Subject: Re: [PATCH v3 7/7] KVM: arm64: Support FFA_NOTIFICATION_INFO_GET in host handler Message-ID: References: <20260616105417.2578670-1-sebastianene@google.com> <20260616105417.2578670-10-sebastianene@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: <20260616105417.2578670-10-sebastianene@google.com> On Tue, Jun 16, 2026 at 10:54:16AM +0000, Sebastian Ene wrote: > Allow the host to query the FF-A notifiction status and proxy the info > get message to Trustzone. Make sure that the SBZ fields are enforced. > > Signed-off-by: Sebastian Ene > --- > arch/arm64/kvm/hyp/nvhe/ffa.c | 19 +++++++++++++++++-- > 1 file changed, 17 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c > index 549250ff8f82..dac30a5fcf5a 100644 > --- a/arch/arm64/kvm/hyp/nvhe/ffa.c > +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c > @@ -714,8 +714,6 @@ static bool ffa_call_supported(u64 func_id) > case FFA_RXTX_MAP: > case FFA_MEM_DONATE: > case FFA_MEM_RETRIEVE_REQ: > - /* Optional notification interfaces added in FF-A 1.1 */ > - case FFA_NOTIFICATION_INFO_GET: > /* Optional interfaces added in FF-A 1.2 */ > case FFA_MSG_SEND_DIRECT_REQ2: /* Optional per 7.5.1 */ > case FFA_MSG_SEND_DIRECT_RESP2: /* Optional per 7.5.1 */ > @@ -1020,6 +1018,20 @@ static void do_ffa_notif_get(struct arm_smccc_1_2_regs *res, > arm_smccc_1_2_smc(args, res); > } > > +static void do_ffa_notif_info_get(struct arm_smccc_1_2_regs *res, > + struct kvm_cpu_context *ctxt) > +{ > + struct arm_smccc_1_2_regs *args; > + > + if (ffa_check_unused_args_sbz(ctxt, 1)) { > + ffa_to_smccc_res(res, FFA_RET_INVALID_PARAMETERS); > + return; > + } > + > + args = (void *)&ctxt->regs.regs[0]; > + arm_smccc_1_2_smc(args, res); hyp_smccc_1_2_smc() ditto FFA_NOTIFICATION_GET, FFA_NOTIFICATION_SET, FFA_NOTIFICATION_UNBIND > +} > + > bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) > { > struct arm_smccc_1_2_regs res; > @@ -1094,6 +1106,9 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id) > case FFA_NOTIFICATION_GET: > do_ffa_notif_get(&res, host_ctxt); > goto out_handled; > + case FFA_NOTIFICATION_INFO_GET: > + do_ffa_notif_info_get(&res, host_ctxt); > + goto out_handled; > } > > if (ffa_call_supported(func_id)) > -- > 2.54.0.1136.gdb2ca164c4-goog >