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From:   Elliot Berman <quic_eberman@quicinc.com>
To:     Bjorn Andersson <quic_bjorande@quicinc.com>,
        Elliot Berman <quic_eberman@quicinc.com>,
        Murali Nalajala <quic_mnalajal@quicinc.com>
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Subject: [PATCH v8 11/28] gunyah: rsc_mgr: Add VM lifecycle RPC
Date:   Mon, 19 Dec 2022 14:58:32 -0800
Message-ID: <20221219225850.2397345-12-quic_eberman@quicinc.com>
In-Reply-To: <20221219225850.2397345-1-quic_eberman@quicinc.com>
References: <20221219225850.2397345-1-quic_eberman@quicinc.com>
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Add Gunyah Resource Manager RPC to launch an unauthenticated VM.

Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 drivers/virt/gunyah/Makefile      |   2 +-
 drivers/virt/gunyah/rsc_mgr.h     |  41 ++++++
 drivers/virt/gunyah/rsc_mgr_rpc.c | 224 ++++++++++++++++++++++++++++++
 include/linux/gunyah_rsc_mgr.h    |  50 +++++++
 4 files changed, 316 insertions(+), 1 deletion(-)
 create mode 100644 drivers/virt/gunyah/rsc_mgr_rpc.c

diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index e7cf59b9e64e..5caa05267a58 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -1,4 +1,4 @@
 obj-$(CONFIG_GUNYAH) += gunyah.o
 
-gunyah_rsc_mgr-y += rsc_mgr.o
+gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o
 obj-$(CONFIG_GUNYAH_RESOURCE_MANAGER) += gunyah_rsc_mgr.o
diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
index b5bb36a7a4cc..1f9e3c38038e 100644
--- a/drivers/virt/gunyah/rsc_mgr.h
+++ b/drivers/virt/gunyah/rsc_mgr.h
@@ -33,4 +33,45 @@ struct gh_rm_rpc;
 int gh_rm_call(struct gh_rm_rpc *rsc_mgr, u32 message_id, void *req_buff, size_t req_buff_size,
 		void **resp_buf, size_t *resp_buff_size);
 
+/* Message IDs: VM Management */
+#define GH_RM_RPC_VM_ALLOC_VMID			0x56000001
+#define GH_RM_RPC_VM_DEALLOC_VMID		0x56000002
+#define GH_RM_RPC_VM_START			0x56000004
+#define GH_RM_RPC_VM_STOP			0x56000005
+#define GH_RM_RPC_VM_CONFIG_IMAGE		0x56000009
+#define GH_RM_RPC_VM_INIT			0x5600000B
+#define GH_RM_RPC_VM_GET_HYP_RESOURCES		0x56000020
+#define GH_RM_RPC_VM_GET_VMID			0x56000024
+
+/* Call: CONSOLE_OPEN, CONSOLE_CLOSE, CONSOLE_FLUSH */
+struct gh_vm_common_vmid_req {
+	__le16 vmid;
+	__le16 reserved0;
+} __packed;
+
+/* Call: VM_STOP */
+struct gh_vm_stop_req {
+	__le16 vmid;
+	u8 flags;
+	u8 reserved;
+	__le32 stop_reason;
+} __packed;
+
+/* Call: VM_CONFIG_IMAGE */
+struct gh_vm_config_image_req {
+	__le16 vmid;
+	__le16 auth_mech;
+	__le32 mem_handle;
+	__le64 image_offset;
+	__le64 image_size;
+	__le64 dtb_offset;
+	__le64 dtb_size;
+} __packed;
+
+/* Call: GET_HYP_RESOURCES */
+struct gh_vm_get_hyp_resources_resp {
+	__le32 n_entries;
+	struct gh_rm_hyp_resource entries[];
+} __packed;
+
 #endif
diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
new file mode 100644
index 000000000000..8d9c1c635a27
--- /dev/null
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/gunyah_rsc_mgr.h>
+
+#include "rsc_mgr.h"
+
+/*
+ * Several RM calls take only a VMID as a parameter and give only standard
+ * response back. Deduplicate boilerplate code by using this common call.
+ */
+static int gh_rm_common_vmid_call(struct gh_rm_rpc *rm, u32 message_id, u16 vmid)
+{
+	void *resp = NULL;
+	struct gh_vm_common_vmid_req req_payload = {
+		.vmid = cpu_to_le16(vmid),
+	};
+	size_t resp_size;
+	int ret;
+
+	ret = gh_rm_call(rm, message_id, &req_payload, sizeof(req_payload), &resp, &resp_size);
+	if (!ret)
+		kfree(resp);
+
+	WARN_ON(!ret && resp_size);
+
+	return ret;
+}
+
+/**
+ * gh_rm_alloc_vmid() - Allocate a new VM in Gunyah. Returns the VM identifier.
+ * @vmid: Use GH_VMID_INVAL to dynamically allocate a VM. A reserved VMID can also be requested
+ *        for a special-purpose platform-defined VM.
+ *
+ * Returns - the allocated VMID or negative value on error
+ */
+int gh_rm_alloc_vmid(struct gh_rm_rpc *rm, u16 vmid)
+{
+	void *resp;
+	struct gh_vm_common_vmid_req req_payload = {
+		.vmid = cpu_to_le16(vmid),
+	};
+	struct gh_vm_common_vmid_req *resp_payload;
+	size_t resp_size;
+	int ret;
+
+	if (vmid == GH_VMID_INVAL)
+		vmid = 0;
+
+	ret = gh_rm_call(rm, GH_RM_RPC_VM_ALLOC_VMID, &req_payload, sizeof(req_payload), &resp,
+			&resp_size);
+	if (ret)
+		return ret;
+
+	if (!vmid) {
+		if (resp_size != sizeof(*resp_payload)) {
+			ret = -EINVAL;
+		} else {
+			resp_payload = resp;
+			ret = resp_payload->vmid;
+		}
+	}
+	kfree(resp);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gh_rm_alloc_vmid);
+
+/**
+ * gh_rm_dealloc_vmid() - Dispose the VMID
+ * @vmid: VM identifier
+ */
+int gh_rm_dealloc_vmid(struct gh_rm_rpc *rm, u16 vmid)
+{
+	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_DEALLOC_VMID, vmid);
+}
+EXPORT_SYMBOL_GPL(gh_rm_dealloc_vmid);
+
+/**
+ * gh_rm_vm_start() - Move the VM into "ready to run" state
+ * @vmid: VM identifier
+ *
+ * On VMs which use proxy scheduling, vcpu_run is needed to actually run the VM.
+ * On VMs which use Gunyah's scheduling, the vCPUs start executing in accordance with Gunyah
+ * scheduling policies.
+ */
+int gh_rm_vm_start(struct gh_rm_rpc *rm, u16 vmid)
+{
+	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_START, vmid);
+}
+EXPORT_SYMBOL_GPL(gh_rm_vm_start);
+
+/**
+ * gh_rm_vm_stop() - Send a request to Resource Manager VM to stop a VM.
+ * @vmid: VM identifier
+ */
+int gh_rm_vm_stop(struct gh_rm_rpc *rm, u16 vmid)
+{
+	struct gh_vm_stop_req req_payload = {
+		.vmid = cpu_to_le16(vmid),
+	};
+	void *resp;
+	size_t resp_size;
+	int ret;
+
+	ret = gh_rm_call(rm, GH_RM_RPC_VM_STOP, &req_payload, sizeof(req_payload),
+			&resp, &resp_size);
+	if (ret)
+		return ret;
+	kfree(resp);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gh_rm_vm_stop);
+
+int gh_rm_vm_configure(struct gh_rm_rpc *rm, u16 vmid, enum gh_rm_vm_auth_mechanism auth_mechanism,
+		u32 mem_handle, u64 image_offset, u64 image_size, u64 dtb_offset, u64 dtb_size)
+{
+	struct gh_vm_config_image_req req_payload = { 0 };
+	void *resp;
+	size_t resp_size;
+	int ret;
+
+	req_payload.vmid = cpu_to_le16(vmid);
+	req_payload.auth_mech = cpu_to_le32(auth_mechanism);
+	req_payload.mem_handle = cpu_to_le32(mem_handle);
+	req_payload.image_offset = cpu_to_le64(image_offset);
+	req_payload.image_size = cpu_to_le64(image_size);
+	req_payload.dtb_offset = cpu_to_le64(dtb_offset);
+	req_payload.dtb_size = cpu_to_le64(dtb_size);
+
+	ret = gh_rm_call(rm, GH_RM_RPC_VM_CONFIG_IMAGE, &req_payload, sizeof(req_payload),
+			&resp, &resp_size);
+	if (ret)
+		return ret;
+	kfree(resp);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gh_rm_vm_configure);
+
+/**
+ * gh_rm_vm_init() - Move the VM to initialized state.
+ * @vmid: VM identifier
+ *
+ * RM will allocate needed resources for the VM. After gh_rm_vm_init, gh_rm_get_hyp_resources()
+ * can be called to learn of the capabilities we can use with the new VM.
+ */
+int gh_rm_vm_init(struct gh_rm_rpc *rm, u16 vmid)
+{
+	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_INIT, vmid);
+}
+EXPORT_SYMBOL_GPL(gh_rm_vm_init);
+
+/**
+ * gh_rm_get_hyp_resources() - Retrieve hypervisor resources (capabilities) associated with a VM
+ * @vmid: VMID of the other VM to get the resources of
+ * @resources: Set by gh_rm_get_hyp_resources and contains the returned hypervisor resources.
+ *
+ * Return: >=0 value indicates the number of gh_rm_hyp_resource entries filled into *resources
+ */
+ssize_t gh_rm_get_hyp_resources(struct gh_rm_rpc *rm, u16 vmid,
+				struct gh_rm_hyp_resource **resources)
+{
+	struct gh_vm_get_hyp_resources_resp *resp;
+	size_t resp_size;
+	int ret;
+	struct gh_vm_common_vmid_req req_payload = {
+		.vmid = cpu_to_le16(vmid),
+	};
+
+	ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_HYP_RESOURCES,
+			 &req_payload, sizeof(req_payload),
+			 (void **)&resp, &resp_size);
+	if (ret)
+		return ret;
+
+	if (resp_size < sizeof(*resp) ||
+		(sizeof(*resp->entries) && (resp->n_entries > U32_MAX / sizeof(*resp->entries))) ||
+		(resp_size != sizeof(*resp) + (resp->n_entries * sizeof(*resp->entries)))) {
+		ret = -EIO;
+		goto out;
+	}
+
+	*resources = kmemdup(resp->entries, (resp->n_entries * sizeof(*resp->entries)), GFP_KERNEL);
+	ret = resp->n_entries;
+
+out:
+	kfree(resp);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gh_rm_get_hyp_resources);
+
+/**
+ * gh_rm_get_vmid() - Retrieve VMID of this virtual machine
+ * @vmid: Filled with the VMID of this VM
+ */
+int gh_rm_get_vmid(struct gh_rm_rpc *rm, u16 *vmid)
+{
+	static u16 cached_vmid = GH_VMID_INVAL;
+	void *resp;
+	size_t resp_size;
+	int ret;
+	int payload = 0;
+
+	if (cached_vmid != GH_VMID_INVAL) {
+		*vmid = cached_vmid;
+		return 0;
+	}
+
+	ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_VMID, &payload, sizeof(payload), &resp, &resp_size);
+	if (ret)
+		return ret;
+
+	if (resp_size != sizeof(*vmid))
+		return -EIO;
+	*vmid = *(u16 *)resp;
+	kfree(resp);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gh_rm_get_vmid);
diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
index b4f55c19954b..eb94b48c41de 100644
--- a/include/linux/gunyah_rsc_mgr.h
+++ b/include/linux/gunyah_rsc_mgr.h
@@ -15,4 +15,54 @@
 /* Gunyah recognizes VMID0 as an alias to the current VM's ID */
 #define GH_VMID_SELF			0
 
+struct gh_rm_rpc;
+
+enum gh_rm_vm_status {
+	GH_RM_VM_STATUS_NO_STATE	= 0,
+	GH_RM_VM_STATUS_INIT		= 1,
+	GH_RM_VM_STATUS_READY		= 2,
+	GH_RM_VM_STATUS_RUNNING		= 3,
+	GH_RM_VM_STATUS_PAUSED		= 4,
+	GH_RM_VM_STATUS_LOAD		= 5,
+	GH_RM_VM_STATUS_AUTH		= 6,
+	GH_RM_VM_STATUS_INIT_FAILED	= 8,
+	GH_RM_VM_STATUS_EXITED		= 9,
+	GH_RM_VM_STATUS_RESETTING	= 10,
+	GH_RM_VM_STATUS_RESET		= 11,
+};
+
+/* RPC Calls */
+int gh_rm_alloc_vmid(struct gh_rm_rpc *rm, u16 vmid);
+int gh_rm_dealloc_vmid(struct gh_rm_rpc *rm, u16 vmid);
+int gh_rm_vm_start(struct gh_rm_rpc *rm, u16 vmid);
+int gh_rm_vm_stop(struct gh_rm_rpc *rm, u16 vmid);
+
+enum gh_rm_vm_auth_mechanism {
+	GH_RM_VM_AUTH_NONE		= 0,
+	GH_RM_VM_AUTH_QCOM_PIL_ELF	= 1,
+	GH_RM_VM_AUTH_QCOM_ANDROID_PVM	= 2,
+};
+
+int gh_rm_vm_configure(struct gh_rm_rpc *rm, u16 vmid, enum gh_rm_vm_auth_mechanism auth_mechanism,
+			u32 mem_handle, u64 image_offset, u64 image_size,
+			u64 dtb_offset, u64 dtb_size);
+int gh_rm_vm_init(struct gh_rm_rpc *rm, u16 vmid);
+
+struct gh_rm_hyp_resource {
+	u8 type;
+	u8 reserved;
+	__le16 partner_vmid;
+	__le32 resource_handle;
+	__le32 resource_label;
+	__le64 cap_id;
+	__le32 virq_handle;
+	__le32 virq;
+	__le64 base;
+	__le64 size;
+} __packed;
+
+ssize_t gh_rm_get_hyp_resources(struct gh_rm_rpc *rm, u16 vmid,
+				struct gh_rm_hyp_resource **resources);
+int gh_rm_get_vmid(struct gh_rm_rpc *rm, u16 *vmid);
+
 #endif
-- 
2.25.1