[PATCH v9 10/27] gunyah: rsc_mgr: Add VM lifecycle RPC

[Elliot Berman <quic_eberman@quicinc.com>]

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     |  36 +++++
 drivers/virt/gunyah/rsc_mgr_rpc.c | 238 ++++++++++++++++++++++++++++++
 include/linux/gunyah_rsc_mgr.h    |  55 +++++++
 4 files changed, 330 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 cc864ff5abbb..de29769f2f3f 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -2,5 +2,5 @@
 
 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) += gunyah_rsc_mgr.o
diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
index 824749e63a54..2f12f31a2ea6 100644
--- a/drivers/virt/gunyah/rsc_mgr.h
+++ b/drivers/virt/gunyah/rsc_mgr.h
@@ -68,4 +68,40 @@ struct gh_rm;
 int gh_rm_call(struct gh_rm *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
+
+struct gh_vm_common_vmid_req {
+	__le16 vmid;
+	__le16 reserved0;
+} __packed;
+
+/* Call: VM_STOP */
+struct gh_vm_stop_req {
+	__le16 vmid;
+	u8 flags; /* currently not used */
+	u8 reserved;
+	__le32 stop_reason; /* currently not used */
+} __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 */
+
 #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..b6935dfac1fe
--- /dev/null
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2023 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 *rm, u32 message_id, u16 vmid)
+{
+	void *resp;
+	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 && resp_size) {
+		pr_warn("Unexpected payload size: %ld Expected: 0", resp_size);
+		dump_stack();
+		kfree(resp);
+		return -EBADMSG;
+	}
+
+	return ret;
+}
+
+/**
+ * gh_rm_alloc_vmid() - Allocate a new VM in Gunyah. Returns the VM identifier.
+ * @vmid: Use GH_VMID_INVAL or GH_VMID_SELF (0) to dynamically allocate a VM. A reserved VMID can
+ *        be supplied to request allocation of a platform-defined VM.
+ *
+ * Returns - the allocated VMID or negative value on error
+ */
+int gh_rm_alloc_vmid(struct gh_rm *rm, u16 vmid)
+{
+	void *resp;
+	struct gh_vm_common_vmid_req req_payload = {
+		.vmid = cpu_to_le16(vmid),
+	};
+	struct gh_vm_alloc_vmid_resp *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)) {
+			pr_warn("%s: unexpected payload size: %ld Expected: %ld", __func__,
+				resp_size, sizeof(*resp_payload));
+			ret = -EBADMSG;
+		} else {
+			resp_payload = resp;
+			ret = le16_to_cpu(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 *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 *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
+ *
+ * Returns - 0 on success; negative value on failure
+ */
+int gh_rm_vm_stop(struct gh_rm *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 && resp_size) {
+		pr_warn("%s: unexpected payload size: %ld Expected: 0", __func__, resp_size);
+		kfree(resp);
+		return -EBADMSG;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gh_rm_vm_stop);
+
+int gh_rm_vm_configure(struct gh_rm *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_le16(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 && resp_size) {
+		pr_warn("%s: unexpected payload size: %ld Expected: 0", __func__, resp_size);
+		kfree(resp);
+		return -EBADMSG;
+	}
+
+	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.
+ *
+ * Returns - 0 on success; negative value on failure
+ */
+int gh_rm_vm_init(struct gh_rm *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.
+ *
+ * Returns - 0 on success; negative value on failure
+ */
+int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid,
+				struct gh_rm_hyp_resources **resources)
+{
+	struct gh_rm_hyp_resources *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)
+		return -EBADMSG;
+
+	if (resp_size < struct_size(resp, entries, 0) ||
+		resp_size != struct_size(resp, entries, le32_to_cpu(resp->n_entries))) {
+		kfree(resp);
+		return -EBADMSG;
+	}
+
+	*resources = resp;
+	return 0;
+}
+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 *rm, u16 *vmid)
+{
+	static u16 cached_vmid = GH_VMID_INVAL;
+	__le16 *resp;
+	size_t resp_size;
+	int ret;
+
+	if (cached_vmid != GH_VMID_INVAL) {
+		*vmid = cached_vmid;
+		return 0;
+	}
+
+	ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_VMID, NULL, 0, (void **)&resp, &resp_size);
+	if (ret)
+		return ret;
+
+	if (resp_size != sizeof(*resp)) {
+		pr_warn("%s: unexpected payload size: %ld Expected: %ld", __func__,
+			resp_size, sizeof(*resp));
+		ret = -EBADMSG;
+		goto out;
+	}
+
+	*vmid = cached_vmid = le16_to_cpu(*resp);
+out:
+	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 959787ad0a3d..be0bce5507b1 100644
--- a/include/linux/gunyah_rsc_mgr.h
+++ b/include/linux/gunyah_rsc_mgr.h
@@ -15,4 +15,59 @@
 /* Gunyah recognizes VMID0 as an alias to the current VM's ID */
 #define GH_VMID_SELF			0
 
+struct gh_rm;
+
+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 *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 *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;
+
+struct gh_rm_hyp_resources {
+	__le32 n_entries;
+	struct gh_rm_hyp_resource entries[];
+} __packed;
+
+int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid,
+				struct gh_rm_hyp_resources **resources);
+int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid);
+
 #endif
-- 
2.39.0


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