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AJvYcCXA+QPKhFHmG1+5oNYGd2RHAeO1K+7BmkLzd9a0s5aL76FM2wARUAvQPcuNGr04n6DjoIquCvslJC5sWuI=@vger.kernel.org X-Gm-Message-State: AOJu0YyDjhVNR08JEBbkl+qTaRCeuxbrnOafZbxhUVNiEwO/Uz8zK58g KKjttDtTyTa2OFKOU8WbD3LQcT5HDrfb0204x9x+ybzRcDwPKVDlbt82FmvFgzwPmQreqoUoAwZ 5ewXYGsDaCqZ7cW+ui6QfsXSSAA== X-Google-Smtp-Source: AGHT+IFMNilNm63tpaGE1Thx+63/zfmAmfVfjbx1vaV84Aa8shwCpD7h0mmGQaUHETfocmAdjgNyNEVh/DYceyRboA4= X-Received: from wmbfm16.prod.google.com ([2002:a05:600c:c10:b0:439:850b:8080]) (user=sebastianene job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:3506:b0:439:6dba:adf2 with SMTP id 5b1f17b1804b1-43ab8fe7734mr46217465e9.15.1740606544357; Wed, 26 Feb 2025 13:49:04 -0800 (PST) Date: Wed, 26 Feb 2025 21:48:53 +0000 In-Reply-To: <20250226214853.3267057-1-sebastianene@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250226214853.3267057-1-sebastianene@google.com> X-Mailer: git-send-email 2.48.1.658.g4767266eb4-goog Message-ID: <20250226214853.3267057-4-sebastianene@google.com> Subject: [PATCH 3/3] KVM: arm64: Release the ownership of the hyp rx buffer to Trustzone From: Sebastian Ene To: catalin.marinas@arm.com, joey.gouly@arm.com, maz@kernel.org, oliver.upton@linux.dev, sebastianene@google.com, snehalreddy@google.com, sudeep.holla@arm.com, suzuki.poulose@arm.com, vdonnefort@google.com, will@kernel.org, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-team@android.com, Andrei Homescu Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce the release FF-A call to notify Trustzone that the hypervisor has finished copying the data from the buffer shared with Trustzone to the non-secure partition. Reported-by: Andrei Homescu Signed-off-by: Sebastian Ene --- arch/arm64/kvm/hyp/nvhe/ffa.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 861f24de97cb..7da0203f1ee9 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -725,6 +725,7 @@ static void do_ffa_part_get(struct arm_smccc_res *res, DECLARE_REG(u32, uuid3, ctxt, 4); DECLARE_REG(u32, flags, ctxt, 5); u32 count, partition_sz, copy_sz; + struct arm_smccc_res _res; =20 hyp_spin_lock(&host_buffers.lock); if (!host_buffers.rx) { @@ -741,7 +742,7 @@ static void do_ffa_part_get(struct arm_smccc_res *res, =20 count =3D res->a2; if (!count) - goto out_unlock; + goto release_rx; =20 if (hyp_ffa_version > FFA_VERSION_1_0) { /* Get the number of partitions deployed in the system */ @@ -757,10 +758,12 @@ static void do_ffa_part_get(struct arm_smccc_res *res, copy_sz =3D partition_sz * count; if (copy_sz > KVM_FFA_MBOX_NR_PAGES * PAGE_SIZE) { ffa_to_smccc_res(res, FFA_RET_ABORTED); - goto out_unlock; + goto release_rx; } =20 memcpy(host_buffers.rx, hyp_buffers.rx, copy_sz); +release_rx: + ffa_rx_release(&_res); out_unlock: hyp_spin_unlock(&host_buffers.lock); } --=20 2.48.1.658.g4767266eb4-goog