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[104.155.91.135]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c03ba328d6dsm214905966b.49.2026.06.16.06.00.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jun 2026 06:00:43 -0700 (PDT) Date: Tue, 16 Jun 2026 14:00:39 +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 1/7] KVM: arm64: Enforce strict SBZ checks in the FF-A proxy Message-ID: References: <20260616105417.2578670-1-sebastianene@google.com> <20260616105417.2578670-2-sebastianene@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: <20260616105417.2578670-2-sebastianene@google.com> On Tue, Jun 16, 2026 at 10:54:08AM +0000, Sebastian Ene wrote: > Introduce a helper method ffa_check_unused_args_sbz to enforce strict > arguments checking when the hypervisor acts as a relayer between the > host and Trustzone. > > Signed-off-by: Sebastian Ene > --- > arch/arm64/kvm/hyp/nvhe/ffa.c | 47 +++++++++++++++++++++++++++++++++++ > 1 file changed, 47 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c > index 1af722771178..c723a21006aa 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++) { Hum, should it be reg <= 17? > + if (cpu_reg(ctxt, reg)) > + return true; > + } > + > + return false; > +} > + [...]