linux-kernel - [RFC PATCH v1 21/38] coco: host: arm64: Add support for virtual device communication

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Message-ID: <20250728135216.48084-22-aneesh.kumar@kernel.org>
Date: Mon, 28 Jul 2025 19:21:58 +0530
From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
To: linux-coco@...ts.linux.dev,
	kvmarm@...ts.linux.dev
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	aik@....com,
	lukas@...ner.de,
	Samuel Ortiz <sameo@...osinc.com>,
	Xu Yilun <yilun.xu@...ux.intel.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Suzuki K Poulose <Suzuki.Poulose@....com>,
	Steven Price <steven.price@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Subject: [RFC PATCH v1 21/38] coco: host: arm64: Add support for virtual device communication

Add support for vdev_communicate with RMM.

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
---
 arch/arm64/include/asm/rmi_cmds.h       | 22 ++++++++++++++++++++++
 arch/arm64/include/asm/rmi_smc.h        |  2 ++
 drivers/virt/coco/arm-cca-host/rmm-da.c | 21 +++++++++++++++++++--
 drivers/virt/coco/arm-cca-host/rmm-da.h |  2 ++
 4 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h
index 7d91f847069b..25197f47a0a9 100644
--- a/arch/arm64/include/asm/rmi_cmds.h
+++ b/arch/arm64/include/asm/rmi_cmds.h
@@ -587,4 +587,26 @@ static inline unsigned long rmi_vdev_create(unsigned long rd,
 	return res.a0;
 }
 
+static inline unsigned long rmi_vdev_communicate(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,
+			     pdev_phys, vdev_phys, vdev_comm_data_phys, &res);
+
+	return res.a0;
+}
+
+static inline unsigned long rmi_vdev_get_state(unsigned long vdev_phys, unsigned long *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;
+}
+
 #endif /* __ASM_RMI_CMDS_H */
diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index e5238b271493..127dd0938604 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -53,7 +53,9 @@
 #define SMC_RMI_PDEV_GET_STATE		SMC_RMI_CALL(0x0178)
 #define SMC_RMI_PDEV_SET_PUBKEY		SMC_RMI_CALL(0x017b)
 #define SMC_RMI_PDEV_STOP		SMC_RMI_CALL(0x017c)
+#define SMC_RMI_VDEV_COMMUNICATE	SMC_RMI_CALL(0x0186)
 #define SMC_RMI_VDEV_CREATE		SMC_RMI_CALL(0x0187)
+#define SMC_RMI_VDEV_GET_STATE		SMC_RMI_CALL(0x0189)
 
 
 #define RMI_ABI_MAJOR_VERSION	1
diff --git a/drivers/virt/coco/arm-cca-host/rmm-da.c b/drivers/virt/coco/arm-cca-host/rmm-da.c
index 41314db1d568..8635f361bbe8 100644
--- a/drivers/virt/coco/arm-cca-host/rmm-da.c
+++ b/drivers/virt/coco/arm-cca-host/rmm-da.c
@@ -207,8 +207,14 @@ static int __do_dev_communicate(int type, struct pci_tsm *tsm)
 	if (type == PDEV_COMMUNICATE)
 		ret = rmi_pdev_communicate(virt_to_phys(dsc_pf0->rmm_pdev),
 					   virt_to_phys(comm_data->io_params));
-	else
-		ret = RMI_ERROR_INPUT;
+	else {
+		struct cca_host_tdi *host_tdi = container_of(tsm->tdi, struct cca_host_tdi, tdi);
+
+		ret = rmi_vdev_communicate(virt_to_phys(dsc_pf0->rmm_pdev),
+					   virt_to_phys(host_tdi->rmm_vdev),
+					   virt_to_phys(comm_data->io_params));
+	}
+
 	if (ret != RMI_SUCCESS) {
 		pr_err("pdev communicate error\n");
 		return ret;
@@ -299,6 +305,12 @@ static int do_dev_communicate(int type, struct pci_tsm *tsm, int target_state)
 			ret = rmi_pdev_get_state(virt_to_phys(dsc_pf0->rmm_pdev),
 						 &state);
 			error_state = RMI_PDEV_ERROR;
+		} else {
+			struct cca_host_tdi *host_tdi = container_of(tsm->tdi, struct cca_host_tdi, tdi);
+
+			ret = rmi_vdev_get_state(virt_to_phys(host_tdi->rmm_vdev),
+						 &state);
+			error_state = RMI_VDEV_ERROR;
 		}
 		if (ret != 0) {
 			pr_err("Get dev state error\n");
@@ -584,3 +596,8 @@ void *rme_create_vdev(struct realm *realm, struct pci_dev *pdev,
 err_out:
 	return ERR_PTR(ret);
 }
+
+static int __maybe_unused do_vdev_communicate(struct pci_tsm *tsm, int target_state)
+{
+	return do_dev_communicate(VDEV_COMMUNICATE, tsm, target_state);
+}
diff --git a/drivers/virt/coco/arm-cca-host/rmm-da.h b/drivers/virt/coco/arm-cca-host/rmm-da.h
index 6d612ea3b87f..37a8f4dce68e 100644
--- a/drivers/virt/coco/arm-cca-host/rmm-da.h
+++ b/drivers/virt/coco/arm-cca-host/rmm-da.h
@@ -51,6 +51,8 @@ struct cca_host_tdi {
 };
 
 #define PDEV_COMMUNICATE	0x1
+#define VDEV_COMMUNICATE	0x2
+
 static inline struct cca_host_dsc_pf0 *to_cca_dsc_pf0(struct pci_dev *pdev)
 {
 	struct pci_tsm *tsm = pdev->tsm;
-- 
2.43.0