- define SMC_RSI_VDEV_DMA_ENABLE and add wrapper in rsi_cmds.h
- invoke the new helper from the guest accept path once the device
passes attestation, rolling back to TDI_LOCKED on failure
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
arch/arm64/include/asm/rsi_cmds.h | 15 +++++++++++++++
arch/arm64/include/asm/rsi_smc.h | 2 ++
drivers/virt/coco/arm-cca-guest/rsi-da.c | 14 ++++++++++++++
3 files changed, 31 insertions(+)
diff --git a/arch/arm64/include/asm/rsi_cmds.h b/arch/arm64/include/asm/rsi_cmds.h
index e6d68760a729..bce08778c799 100644
--- a/arch/arm64/include/asm/rsi_cmds.h
+++ b/arch/arm64/include/asm/rsi_cmds.h
@@ -225,4 +225,19 @@ static inline unsigned long rsi_vdev_get_info(unsigned long vdev_id,
return res.a0;
}
+static inline unsigned long __rsi_vdev_dma_enable(unsigned long vdev_id,
+ unsigned long non_ats_plane,
+ unsigned long lock_nonce,
+ unsigned long meas_nonce,
+ unsigned long report_nonce)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_invoke(SMC_RSI_VDEV_DMA_ENABLE, vdev_id,
+ non_ats_plane, lock_nonce,
+ meas_nonce, report_nonce, &res);
+
+ return res.a0;
+}
+
#endif /* __ASM_RSI_CMDS_H */
diff --git a/arch/arm64/include/asm/rsi_smc.h b/arch/arm64/include/asm/rsi_smc.h
index 49334d07dd55..7bfc8bc5c2ff 100644
--- a/arch/arm64/include/asm/rsi_smc.h
+++ b/arch/arm64/include/asm/rsi_smc.h
@@ -186,6 +186,8 @@ struct realm_config {
*/
#define SMC_RSI_IPA_STATE_GET SMC_RSI_FID(0x198)
+#define SMC_RSI_VDEV_DMA_ENABLE SMC_RSI_FID(0x19C)
+
struct rsi_vdevice_info {
union {
struct {
diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.c b/drivers/virt/coco/arm-cca-guest/rsi-da.c
index 4852a03dd17d..0b98f6271da6 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.c
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.c
@@ -264,6 +264,13 @@ static int verify_digests(struct cca_guest_dsc *dsc)
return 0;
}
+static inline int rsi_vdev_enable_dma(int vdev_id, struct dsm_device_info *dev_info)
+{
+ return __rsi_vdev_dma_enable(vdev_id, 0, dev_info->lock_nonce,
+ dev_info->meas_nonce, dev_info->report_nonce);
+
+}
+
int cca_device_verify_and_accept(struct pci_dev *pdev)
{
int ret;
@@ -336,5 +343,12 @@ int cca_device_verify_and_accept(struct pci_dev *pdev)
pci_err(pdev, "failed to switch the device (%u) to RUN state\n", ret);
return -EIO;
}
+
+ if (rsi_vdev_enable_dma(vdev_id, &dsc->dev_info)) {
+ rhi_vdev_set_tdi_state(pdev, RHI_DA_TDI_CONFIG_LOCKED);
+ pci_err(pdev, "failed to enable DMA from the device %d\n", ret);
+ return -EIO;
+ }
+
return 0;
}
--
2.43.0