[RFC PATCH v4 09/11] coco: guest: arm64: Hook TSM accept to Realm TDISP RUN transition

["Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>]

Add an accept callback in pci_tsm_ops and implement cca_device_accept() to:
- verify evidence generation (lock_nonce)
- allocate and register protected MMIO ranges
- transition TDI state to RUN

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
 drivers/virt/coco/arm-cca-guest/arm-cca.c | 20 +++++++++++
 drivers/virt/coco/arm-cca-guest/rsi-da.c  | 43 +++++++++++++++++++++++
 drivers/virt/coco/arm-cca-guest/rsi-da.h  |  1 +
 3 files changed, 64 insertions(+)

diff --git a/drivers/virt/coco/arm-cca-guest/arm-cca.c b/drivers/virt/coco/arm-cca-guest/arm-cca.c
index 320dd5aa7b9a..b29b3948a454 100644
--- a/drivers/virt/coco/arm-cca-guest/arm-cca.c
+++ b/drivers/virt/coco/arm-cca-guest/arm-cca.c
@@ -499,9 +499,29 @@ static void cca_tsm_unlock(struct pci_tsm *tsm)
 	kfree(cca_dsc);
 }
 
+static int __cca_tsm_accept(struct pci_dev *pdev, unsigned long lock_nonce)
+{
+	int ret;
+
+	ret = cca_device_accept(pdev, lock_nonce);
+	if (ret) {
+		pci_err(pdev, "failed to transition the device to run state (%d)\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int cca_tsm_accept(struct pci_dev *pdev)
+{
+	struct cca_guest_dsc *dsc = to_cca_guest_dsc(pdev);
+
+	return __cca_tsm_accept(pdev, dsc->dev_info.lock_nonce);
+}
+
 static struct pci_tsm_ops cca_devsec_pci_ops = {
 	.lock = cca_tsm_lock,
 	.unlock = cca_tsm_unlock,
+	.accept	 = cca_tsm_accept,
 };
 
 static void cca_devsec_tsm_remove(void *tsm_dev)
diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.c b/drivers/virt/coco/arm-cca-guest/rsi-da.c
index 039138768f8f..7c2b28fa43a1 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.c
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.c
@@ -230,3 +230,46 @@ int cca_verify_digests(u64 hash_algo,
 	}
 	return 0;
 }
+
+int cca_device_accept(struct pci_dev *pdev, unsigned long lock_nonce)
+{
+	int ret;
+	struct cca_guest_dsc *dsc = to_cca_guest_dsc(pdev);
+
+	if (lock_nonce != dsc->dev_info.lock_nonce) {
+		pci_err(pdev, "Device evidence generation mismatch\n");
+		return -EIO;
+	}
+
+	/* Allocation private mmio range based on interface report. */
+	struct pci_tsm_mmio *tsm_mmio __free(kfree) = pci_tsm_mmio_alloc(pdev);
+	if (!tsm_mmio) {
+		pci_err(pdev, "Protected mmio range allocation failure\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * Present the private mmio range in the resource hierarchy.
+	 * We don't use this for ioremap, ioremap check the RIPAS value.
+	 */
+	ret = pci_tsm_mmio_setup(pdev, tsm_mmio);
+	if (ret) {
+		pci_err(pdev, "Protected mmio setup failure\n");
+		return ret;
+	}
+
+	ret = cca_map_evidence_report_range(pdev, tsm_mmio);
+	if (ret) {
+		pci_err(pdev, "failed to validate the interface report\n");
+		return ret;
+	}
+
+	ret = rhi_vdev_set_tdi_state(pdev, RHI_DA_TDI_CONFIG_RUN);
+	if (ret) {
+		pci_err(pdev, "failed to switch the device (%u) to RUN state\n", ret);
+		return ret;
+	}
+
+	dsc->pci.mmio = no_free_ptr(tsm_mmio);
+	return 0;
+}
diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.h b/drivers/virt/coco/arm-cca-guest/rsi-da.h
index 07a044d3e335..eeb049d374c5 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.h
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h
@@ -61,5 +61,6 @@ int cca_verify_digests(u64 hash_algo,
 		uint8_t *interface_report, size_t interface_report_size,
 		uint8_t *measurements, size_t measurements_size,
 		struct rsi_vdevice_info *dev_info);
+int cca_device_accept(struct pci_dev *pdev, unsigned long lock_nonce);
 
 #endif
-- 
2.43.0