[RFC PATCH v4 05/16] coco: host: arm64: Add support for virtual device communication
Aneesh Kumar K.V (Arm)
aneesh.kumar at kernel.org
Mon Apr 27 01:53:33 PDT 2026
Add support for vdev_communicate with RMM.
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar at kernel.org>
---
arch/arm64/include/asm/rmi_cmds.h | 32 ++++++++++
arch/arm64/include/asm/rmi_smc.h | 7 +++
drivers/virt/coco/arm-cca-host/rmi-da.c | 83 ++++++++++++++++++++++---
drivers/virt/coco/arm-cca-host/rmi-da.h | 20 ++++++
4 files changed, 135 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h
index 205fc200d1db..2925abde3882 100644
--- a/arch/arm64/include/asm/rmi_cmds.h
+++ b/arch/arm64/include/asm/rmi_cmds.h
@@ -871,4 +871,36 @@ int rmi_psmmu_st_l2_create(unsigned long psmmu_phys,
int rmi_psmmu_st_l2_destroy(unsigned long psmmu_phys,
unsigned long stream_id, unsigned long *rmi_ret);
+static inline unsigned long rmi_vdev_communicate(unsigned long rd_phys,
+ unsigned long pdev_phys, unsigned long vdev_phys,
+ unsigned long vdev_comm_data_phys)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_invoke(SMC_RMI_VDEV_COMMUNICATE, rd_phys, pdev_phys,
+ vdev_phys, vdev_comm_data_phys, &res);
+
+ return res.a0;
+}
+
+static inline unsigned long rmi_vdev_get_state(unsigned long vdev_phys,
+ enum rmi_vdev_state *state)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_invoke(SMC_RMI_VDEV_GET_STATE, vdev_phys, &res);
+
+ *state = res.a1;
+ return res.a0;
+}
+
+static inline unsigned long rmi_vdev_abort(unsigned long vdev_phys)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_invoke(SMC_RMI_VDEV_ABORT, vdev_phys, &res);
+
+ return res.a0;
+}
+
#endif /* __ASM_RMI_CMDS_H */
diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index 5b540d25914e..72e4a53b74b0 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -643,4 +643,11 @@ struct rmi_psmmu_params {
};
};
+enum rmi_vdev_state {
+ RMI_VDEV_NEW,
+ RMI_VDEV_UNLOCKED,
+ RMI_VDEV_LOCKED,
+ RMI_VDEV_STARTED,
+ RMI_VDEV_ERROR,
+};
#endif /* __ASM_RMI_SMC_H */
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c
index 33a2551fd09f..d61c3191c038 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.c
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.c
@@ -11,6 +11,8 @@
#include <crypto/internal/rsa.h>
#include <keys/asymmetric-type.h>
#include <keys/x509-parser.h>
+#include <linux/kvm_types.h>
+#include <asm/kvm_rmi.h>
#include "rmi-da.h"
@@ -217,6 +219,7 @@ static int _do_dev_communicate(enum dev_comm_type type, struct pci_tsm *tsm, int
gfp_t cache_alloc_flags;
int nbytes, cp_len;
struct cache_object **cache_objp, *cache_obj;
+ struct cca_host_tdi *host_tdi = to_cca_host_tdi(tsm->pdev);
struct cca_host_pdev_dsc *pdev_dsc = to_cca_pdev_dsc(tsm->dsm_dev);
struct cca_host_comm_data *comm_data = to_cca_comm_data(tsm->pdev);
struct rmi_dev_comm_enter *io_enter = &comm_data->io_params->enter;
@@ -228,7 +231,10 @@ static int _do_dev_communicate(enum dev_comm_type type, struct pci_tsm *tsm, int
rmi_ret = rmi_pdev_communicate(virt_to_phys(pdev_dsc->rmm_pdev),
virt_to_phys(comm_data->io_params));
else
- rmi_ret = RMI_ERROR_INPUT;
+ rmi_ret = rmi_vdev_communicate(virt_to_phys(host_tdi->realm->rd),
+ virt_to_phys(pdev_dsc->rmm_pdev),
+ virt_to_phys(host_tdi->rmm_vdev),
+ virt_to_phys(comm_data->io_params));
if (rmi_ret != RMI_SUCCESS) {
if (rmi_ret == RMI_BUSY)
return -EBUSY;
@@ -252,6 +258,12 @@ static int _do_dev_communicate(enum dev_comm_type type, struct pci_tsm *tsm, int
case RMI_DEV_CERTIFICATE:
cache_objp = &pf0_ep_dsc->cert_chain.cache;
break;
+ case RMI_DEV_INTERFACE_REPORT:
+ cache_objp = &host_tdi->interface_report;
+ break;
+ case RMI_DEV_MEASUREMENTS:
+ cache_objp = &host_tdi->measurements;
+ break;
default:
return -EINVAL;
}
@@ -355,9 +367,11 @@ static int _do_dev_communicate(enum dev_comm_type type, struct pci_tsm *tsm, int
static int do_dev_communicate(enum dev_comm_type type,
struct pci_tsm *tsm, unsigned long error_state, int *stream_wait)
{
- int ret, state = error_state;
+ int ret, state;
+ unsigned long rmi_ret;
struct rmi_dev_comm_enter *io_enter;
struct cca_host_pdev_dsc *pdev_dsc = to_cca_pdev_dsc(tsm->dsm_dev);
+ struct cca_host_tdi *host_tdi = to_cca_host_tdi(tsm->pdev);
io_enter = &pdev_dsc->comm_data.io_params->enter;
io_enter->resp_len = 0;
@@ -369,16 +383,23 @@ static int do_dev_communicate(enum dev_comm_type type,
if (ret) {
if (type == PDEV_COMMUNICATE)
rmi_pdev_abort(virt_to_phys(pdev_dsc->rmm_pdev));
+ else
+ rmi_vdev_abort(virt_to_phys(host_tdi->rmm_vdev));
+
+ state = error_state;
} else {
/*
* Some device communication error will transition the
* device to error state. Report that.
*/
- if (type == PDEV_COMMUNICATE) {
- if (rmi_pdev_get_state(virt_to_phys(pdev_dsc->rmm_pdev),
- (enum rmi_pdev_state *)&state))
- state = error_state;
- }
+ if (type == PDEV_COMMUNICATE)
+ rmi_ret = rmi_pdev_get_state(virt_to_phys(pdev_dsc->rmm_pdev),
+ (enum rmi_pdev_state *)&state);
+ else
+ rmi_ret = rmi_vdev_get_state(virt_to_phys(host_tdi->rmm_vdev),
+ (enum rmi_vdev_state *)&state);
+ if (rmi_ret)
+ state = error_state;
}
if (state == error_state)
@@ -408,6 +429,11 @@ static int wait_for_pdev_state(struct pci_tsm *tsm, enum rmi_pdev_state target_s
return wait_for_dev_state(PDEV_COMMUNICATE, tsm, target_state, RMI_PDEV_ERROR);
}
+static int wait_for_vdev_state(struct pci_tsm *tsm, enum rmi_vdev_state target_state)
+{
+ return wait_for_dev_state(VDEV_COMMUNICATE, tsm, target_state, RMI_VDEV_ERROR);
+}
+
static int parse_certificate_chain(struct pci_tsm *tsm)
{
struct cca_host_pf0_ep_dsc *pf0_ep_dsc;
@@ -603,6 +629,49 @@ static int submit_pdev_state_transition_work(struct pci_dev *pdev,
return 0;
}
+static void vdev_state_transition_workfn(struct work_struct *work)
+{
+ unsigned long state;
+ struct pci_tsm *tsm;
+ struct dev_comm_work *setup_work;
+ struct cca_host_pdev_dsc *pdev_dsc;
+
+ setup_work = container_of(work, struct dev_comm_work, work);
+ tsm = setup_work->tsm;
+
+ pdev_dsc = to_cca_pdev_dsc(tsm->dsm_dev);
+ guard(mutex)(&pdev_dsc->object_lock);
+
+ state = wait_for_vdev_state(tsm, setup_work->target_state);
+ WARN_ON(state != setup_work->target_state);
+}
+
+static int __maybe_unused submit_vdev_state_transition_work(struct pci_dev *pdev, int target_state)
+{
+ enum rmi_vdev_state state;
+ struct dev_comm_work comm_work;
+ struct cca_host_comm_data *comm_data = to_cca_comm_data(pdev);
+ struct cca_host_tdi *host_tdi = to_cca_host_tdi(pdev);
+
+ INIT_WORK_ONSTACK(&comm_work.work, vdev_state_transition_workfn);
+ comm_work.tsm = pdev->tsm;
+ comm_work.target_state = target_state;
+
+ queue_work(comm_data->work_queue, &comm_work.work);
+
+ flush_work(&comm_work.work);
+ destroy_work_on_stack(&comm_work.work);
+
+ /* check if we reached target state */
+ if (rmi_vdev_get_state(virt_to_phys(host_tdi->rmm_vdev), &state))
+ return -ENXIO;
+
+ if (state != target_state)
+ /* Protocol didn't take it to expected target state */
+ return -EPROTO;
+ return 0;
+}
+
static void pdev_collect_identity_workfn(struct work_struct *work)
{
struct pci_tsm *tsm;
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.h b/drivers/virt/coco/arm-cca-host/rmi-da.h
index 798a8ed7505f..88fa428f788e 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.h
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.h
@@ -116,6 +116,16 @@ struct cca_host_fn_dsc {
enum dev_comm_type {
PDEV_COMMUNICATE = 0x1,
+ VDEV_COMMUNICATE = 0x2,
+};
+
+struct cca_host_tdi {
+ struct pci_tdi tdi;
+ struct realm *realm;
+ void *rmm_vdev;
+ /* protected by cca_host_pdev_dsc.object_lock */
+ struct cache_object *interface_report;
+ struct cache_object *measurements;
};
static inline int insert_addr_range_sorted(struct rmi_addr_range *addr_range,
@@ -203,6 +213,16 @@ static inline struct cca_host_comm_data *to_cca_comm_data(struct pci_dev *pdev)
return NULL;
}
+static inline struct cca_host_tdi *to_cca_host_tdi(struct pci_dev *pdev)
+{
+ struct pci_tsm *tsm = pdev->tsm;
+
+ if (!tsm || !tsm->tdi)
+ return NULL;
+
+ return container_of(tsm->tdi, struct cca_host_tdi, tdi);
+}
+
int cca_pdev_create(struct pci_dev *pdev);
int cca_pdev_collect_identity(struct pci_dev *pdev);
bool cca_pdev_needs_key(struct pci_dev *pdev);
--
2.43.0
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