[RFC PATCH v3 09/11] coco: guest: arm64: Hook TSM accept to Realm TDISP RUN transition

Aneesh Kumar K.V (Arm)
2026-03-12T08:05:47Z

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

Cc: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Alexey Kardashevskiy <aik@amd.com>
Cc: Samuel Ortiz <sameo@rivosinc.com>
Cc: Xu Yilun <yilun.xu@linux.intel.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Steven Price <steven.price@arm.com>
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 80ee20c8a7a6..84152f505b10 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 6f40329ac2f9..4030fa213ff4 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 4903a770412e..c550926145a0 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.h
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h
@@ -61,4 +61,5 @@ 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