- define `__RHI_DA_VDEV_GET_INTERFACE_REPORT` for guest requests and
expose the RMI SMC ID/wrapper for `RMI_VDEV_GET_INTERFACE_REPORT`
- teach the CCA host driver to handle the new guest request by fetching
the report from RMM using `rmi_vdev_get_interface_report()` and
refreshing the cached buffer
- add a helper that submits a DOE work to pull the latest report into
the cache
This lets guests request up-to-date interface reports via RHI
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>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
arch/arm64/include/asm/rhi.h | 1 +
arch/arm64/include/asm/rmi_cmds.h | 12 ++++++
arch/arm64/include/asm/rmi_smc.h | 1 +
drivers/virt/coco/arm-cca-host/arm-cca.c | 4 ++
drivers/virt/coco/arm-cca-host/rmi-da.c | 55 +++++++++++++++++++++++-
drivers/virt/coco/arm-cca-host/rmi-da.h | 1 +
6 files changed, 73 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/rhi.h b/arch/arm64/include/asm/rhi.h
index 3c84fedba4ab..edb23614cdeb 100644
--- a/arch/arm64/include/asm/rhi.h
+++ b/arch/arm64/include/asm/rhi.h
@@ -82,5 +82,6 @@ enum rhi_tdi_state {
/* guest request operation nr */
#define __RHI_DA_OBJECT_SIZE 0x1
#define __RHI_DA_OBJECT_READ 0x2
+#define __RHI_DA_VDEV_GET_INTERFACE_REPORT 0x3
#endif
diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h
index 5964549aca23..ea9d4ec21e0e 100644
--- a/arch/arm64/include/asm/rmi_cmds.h
+++ b/arch/arm64/include/asm/rmi_cmds.h
@@ -661,4 +661,16 @@ static inline unsigned long rmi_vdev_destroy(unsigned long rd,
return res.a0;
}
+static inline unsigned long rmi_vdev_get_interface_report(unsigned long rd,
+ unsigned long pdev_phys,
+ unsigned long vdev_phys)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_1_1_invoke(SMC_RMI_VDEV_GET_INTERFACE_REPORT,
+ rd, pdev_phys, 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 95ddbc6dd1e0..b3239f51de22 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -60,6 +60,7 @@
#define SMC_RMI_VDEV_DESTROY SMC_RMI_CALL(0x0188)
#define SMC_RMI_VDEV_GET_STATE SMC_RMI_CALL(0x0189)
#define SMC_RMI_VDEV_UNLOCK SMC_RMI_CALL(0x018A)
+#define SMC_RMI_VDEV_GET_INTERFACE_REPORT SMC_RMI_CALL(0x01D0)
#define SMC_RMI_VDEV_LOCK SMC_RMI_CALL(0x01D2)
diff --git a/drivers/virt/coco/arm-cca-host/arm-cca.c b/drivers/virt/coco/arm-cca-host/arm-cca.c
index 8678acd84d7d..de3c239345a8 100644
--- a/drivers/virt/coco/arm-cca-host/arm-cca.c
+++ b/drivers/virt/coco/arm-cca-host/arm-cca.c
@@ -342,6 +342,10 @@ static ssize_t cca_tsm_guest_req(struct pci_tdi *tdi, enum pci_tsm_req_scope sco
/* error */
return len;
}
+ case __RHI_DA_VDEV_GET_INTERFACE_REPORT:
+ {
+ return cca_vdev_get_interface_report(pdev);
+ }
default:
return -EINVAL;
}
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c
index 123cda44535c..48a18905bb55 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.c
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.c
@@ -839,7 +839,7 @@ void cca_vdev_unlock_and_destroy(struct realm *realm,
host_tdi->realm = NULL;
}
-static void __maybe_unused vdev_fetch_object_workfn(struct work_struct *work)
+static void vdev_fetch_object_workfn(struct work_struct *work)
{
int state;
struct pci_tsm *tsm;
@@ -956,3 +956,56 @@ int cca_vdev_read_cached_object(struct pci_dev *pdev, int type,
return len;
}
+
+static int vdev_update_interface_report_cache(struct pci_dev *pdev)
+{
+ struct dev_comm_work comm_work;
+ struct cca_host_tdi *host_tdi = to_cca_host_tdi(pdev);
+ struct cca_host_comm_data *comm_data = to_cca_comm_data(pdev);
+
+ INIT_WORK_ONSTACK(&comm_work.work, vdev_fetch_object_workfn);
+ init_completion(&comm_work.complete);
+ comm_work.tsm = pdev->tsm;
+ if (host_tdi->interface_report) {
+ comm_work.cache_buf = host_tdi->interface_report->buf;
+ comm_work.cache_offset = &host_tdi->interface_report->offset;
+ comm_work.cache_size = host_tdi->interface_report->size;
+ } else {
+ comm_work.cache_buf = NULL;
+ comm_work.cache_offset = NULL;
+ comm_work.cache_size = 0;
+ }
+
+ queue_work(comm_data->work_queue, &comm_work.work);
+ wait_for_completion(&comm_work.complete);
+ destroy_work_on_stack(&comm_work.work);
+
+ if (comm_work.cache_size == 0)
+ return -ENXIO;
+ return 0;
+}
+
+int cca_vdev_get_interface_report(struct pci_dev *pdev)
+{
+ phys_addr_t rmm_pdev_phys;
+ phys_addr_t rmm_vdev_phys;
+ struct cca_host_pf0_dsc *pf0_dsc;
+ struct cca_host_tdi *host_tdi;
+ struct realm *realm;
+ phys_addr_t rd_phys;
+
+ host_tdi = to_cca_host_tdi(pdev);
+ rmm_vdev_phys = virt_to_phys(host_tdi->rmm_vdev);
+ realm = &host_tdi->tdi.kvm->arch.realm;
+ rd_phys = virt_to_phys(realm->rd);
+
+ pf0_dsc = to_cca_pf0_dsc(pdev->tsm->dsm_dev);
+ rmm_pdev_phys = virt_to_phys(pf0_dsc->rmm_pdev);
+
+ if (rmi_vdev_get_interface_report(rd_phys,
+ rmm_pdev_phys, rmm_vdev_phys))
+ return -ENXIO;
+
+ /* get and update the interface report cache. */
+ return vdev_update_interface_report_cache(pdev);
+}
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.h b/drivers/virt/coco/arm-cca-host/rmi-da.h
index c4f31986389c..662cedd23c42 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.h
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.h
@@ -150,4 +150,5 @@ void cca_vdev_unlock_and_destroy(struct realm *realm, struct pci_dev *pdev,
int cca_vdev_get_object_size(struct pci_dev *pdev, int type);
int cca_vdev_read_cached_object(struct pci_dev *pdev, int type, unsigned long offset,
unsigned long max_len, void __user *user_buf);
+int cca_vdev_get_interface_report(struct pci_dev *pdev);
#endif
--
2.43.0