Teach the Arm CCA guest driver how to transition a Realm device between
RUN and STOP states. The new helpers issue the RSI START/STOP calls,
poll with CONTINUE until completion, and surface errors back to the TSM.
The PCI TSM accept/unlock paths now invoke these helpers so writing `1`
to `tsm/accept` correctly kicks off the TDISP RUN sequence and unlock
tears it back down.
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
drivers/virt/coco/arm-cca-guest/arm-cca.c | 13 +++++++++++++
drivers/virt/coco/arm-cca-guest/rsi-da.c | 5 +++++
2 files changed, 18 insertions(+)
diff --git a/drivers/virt/coco/arm-cca-guest/arm-cca.c b/drivers/virt/coco/arm-cca-guest/arm-cca.c
index e86c3ad355f8..46cc0fdefe34 100644
--- a/drivers/virt/coco/arm-cca-guest/arm-cca.c
+++ b/drivers/virt/coco/arm-cca-guest/arm-cca.c
@@ -239,9 +239,22 @@ static void cca_tsm_unlock(struct pci_tsm *tsm)
kfree(cca_dsc);
}
+static int cca_tsm_accept(struct pci_dev *pdev)
+{
+ int ret;
+
+ ret = cca_device_verify_and_accept(pdev);
+ if (ret) {
+ pci_err(pdev, "failed to transition the device to run state (%d)\n", ret);
+ return -EIO;
+ }
+ return 0;
+}
+
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 c6b92f4ae9c5..4852a03dd17d 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.c
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.c
@@ -331,5 +331,10 @@ int cca_device_verify_and_accept(struct pci_dev *pdev)
return -EIO;
}
+ 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 -EIO;
+ }
return 0;
}
--
2.43.0